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www.irf.com page 1 of 42 iRAUDAMP7S rev 1.3 iRAUDAMP7S 25w-500w scalable output power class d audio power amplifier reference design using the irs2092s protected digital audio driver by jun honda, manuel rodrguez, liwei zheng caution: international rectifier suggests the following guidelines for safe operation and handling of iRAUDAMP7S demo board: ? always wear safety glasses whenever operating demo board ? avoid personal contact with exposed metal surfaces when operating demo board ? turn off demo board when placing or removing measurement probes
www.irf.com page 2 of 42 iRAUDAMP7S rev 1.3 item table of contents page 1 introduction of scalable design ???????????????????.. 3 2 power table values for each power model??????????????? 4 3 specifications??????????????????????????? 4-5 4 connection setup?????????????????????????. 6 5 test procedure?????????????????????????..? 7 6 performance and test graphs???????????????????.? 8-13 7 clipping characteristics??????????????????????? 14 8 efficiency????????????????????????????? 14-16 9 thermal consideratio ns??????????? ??????...????? 16 10 psrr, half bridge, full bridge????????????????????. 16-17 11 short circuit response???????????????????????.. 17-18 12 iRAUDAMP7S overview?????????????????????.? 18-19 13 functions descriptions??????????????????????? 20-22 14 selectable dead time?????????????..?????????? 22 15 protection features?????????????????..??????? 23-25 16 click and pop noise control????????????????.????? 25 17 bus pumping????????????????????.??????? 26-27 18 bridged configuration???????????????.??..?????? 27 19 input signal and gain???????????????.????????. 29 20 gain settings???????????????????????????. 29 21 schematics???????????????????????????? 30-32 22 bill of materials????????????????????????..?? 33-36 23 iRAUDAMP7S models differential table???????????????... 37 24 hardware????????????????????????????? 38-39 25 pcb specifications????????????????????????? 40 26 assembly drawings??????????????????????.?? 41 27 revision changes descriptions???????????????????.. 42
www.irf.com page 3 of 42 iRAUDAMP7S rev 1.3 introduction the iRAUDAMP7S reference design is a two-channel cl ass d audio power amplifie r that features output power scalability. the iRAUDAMP7S offers selectable half-bridge (stereo) and full-bridge (bridged) modes. this reference design demonstrates how to use the irs 2092 class d audio driver ic, along with ir?s digital audio dual mosfets, such as irfi4024h-117p, irfi4019h-117p, irfi4212h-117p and irfi4020h-117p, on a single layer pcb. the design shows how to implem ent peripheral circuits on an optimum pcb layout using a single sided board. the resulting design requires a small heatsink for normal operation (one-eighth of continuous rated power). the reference design provides all the required housekeeping power supplies and protections. unless otherwise noted, this user?s manual is based on 150v model, iRAUDAMP7S-150. other output power versions can be configured by replacing components given in the component selection of table 5 on page 36 applications ? av receivers ? home theater systems ? mini component stereos ? powered speakers ? sub-woofers ? musical instrument amplifiers ? automotive after market amplifiers features output power: scalable output power from 25w- 500w (see table 1) residual noise: 200 v, ihf-a weighted, aes-17 filter distortion: 0.007 % thd+n @ 60w, 4 ? efficiency: 90 % @ 500w, 8 ? , class d stage multiple protection features: over-current pr otection (ocp), high side and low side mosfet over-voltage protection (ovp), under-voltage protection (uvp), high side and low side mosfet dc-protection (dcp), over-temperature protection (otp) pwm topology: self-oscillating pwm, half-brid ge or full-bridge topologies selectable
www.irf.com page 4 of 42 iRAUDAMP7S rev 1.3 table 1 iRAUDAMP7S specification table series model name item amp7s-55 amp7s-100 amp7s-150 amp7s-200 ir power mosfet fet1a, fet1b irfi4024h-117p irfi4212h-117p irfi4019h-117p irfi4020h-117p 8 ? 25w x 2 60w x 2 125w x 2 250w x 2 half bridge 4 ? 50w x 2 120w x 2 250w x 2 not supported full bridge 8 ? 100w x 1 240w x 1 500w x 1 not supported nominal supply voltage +b, -b 25v 35v 50v 70v min/max supply voltage +b, -b 20v ~ 28v 28v ~ 45v 45v ~ 60v 60v ~ 80v voltage gain gv 20 30 36 40 notes: ? all the power ratings are at clipping power (thd+n = 1 %). to estimate power ratings at thd+n=10%, multiply them by 1.33 ? see table 5 on page 36 for the complete listing of components table. specifications general test conditions for iRAUDAMP7S-150 (unl ess otherwise noted) notes / conditions power supply voltages 50v load impedance 4 ? self-oscillating fr equency 400khz voltage gain 36 electrical data typical notes / conditions ir devices used irs2092, protected digital audio driver irfi4024h-117p, irfi4019h-117p , irfi4212h-117p, irfi4020h- 117p digital audio mosfets pwm modulator self-oscillating, second order sigma-delta modulation, analog input power supply range 45v to 60v or see table 1 above output power ch1-2: (1 % thd+n) 300w 1khz output power ch1-2: (10 % thd+n) 400w 1khz rated load impedance 8 - 4 ? resistive load standby supply current +50 ma/-80 ma no input signal total idle power consumption 7w no input signal channel efficiency 90 % single-channel driven, 250w .
www.irf.com page 5 of 42 iRAUDAMP7S rev 1.3 audio performance before demodulator class d output notes / conditions thd+n, 1w thd+n, 10w thd+n, 60w thd+n, 100w 0.01 % 0.005 % 0.005 % 0.007 % 0.02 % 0.007 % 0.007 % 0.008 % 1khz, single-channel driven dynamic range 101 db 101 db a-weighted, aes-17 filter, single-channel operation residual noise 200 v 200 v 22 hz ? 20khz, aes17 filter self-oscillating frequency 400khz damping factor 2000 120 1khz, relative to 4 ? load channel separation 95 db 85 db 75 db 90 db 80 db 65 db 100hz 1khz 10khz frequency response : 20 hz- 20khz 20 hz-35khz 3 db 1w, 4 ? ? 8 ? load thermal performance (t a =25 c) condition typical notes / conditions idling t c =30 c t pcb =37 c no signal input 2 ch x 31w (1/8 rated power) t c =54 c t pcb =67 c 2 ch x 250w (rated power) t c =80 c t pcb =106 c otp shutdown after 150 s physical specifications dimensions 5.7?(l) x 4?(w) x 1.25?(h) 145 mm (l) x 100 mm (w) x 35 mm(h) weight 0.330kgm
www.irf.com page 6 of 42 iRAUDAMP7S rev 1.3 test setup fig 1 typical test setup connector description ch1 in rca1a analog input for ch1 ch2 in rca1b analog input for ch2 supply cnn1 positive and negative supply (+b / -b) ch1 out spk1a output for ch1 ch2 out spk1b output for ch2 switches descriptions s1 shutdown pwm s300 half bridge / full bridge select indicator description led1a, b pwm (presence of low side gate signal) led2a,b protection spk1a spk1b g led1 a +b, 5a dc supply 4 ohm 4 ohm -b, 5a dc supply a udio si g nal led2 a led1 b led2 b s1 s300 cnn1 rca1a rca1b
www.irf.com page 7 of 42 iRAUDAMP7S rev 1.3 test procedures test setup: 1. on the unit under test (uut), set switch s1 to off and s300 to stereo positions. 2. connect 4 -200 w dummy loads to output connectors, spkr1a and spkr1b, as shown on fig 1. 3. set up a dual power supply 50v with 5a current limit 4. turn off the dual power supply before connecting to uut. 5. connect the dual power supply to cnn1, as shown in fig 1. power up: 6. turn on the dual power supply. the b supplies must be applied and removed at the same time. 7. the red leds (protections) turn on immediately and stay on as long as s1 is in off position. blue leds stay off. 8. quiescent current for the positive and negative supplies must be less than 50ma, while s1 is in off position. under this condition, irs2092 is in shutdown mode. 9. slide s1 to on position; after one second delay, the two blue leds turn on and the red leds turns off. the two blue leds indicate that pwm oscillation is present. this transition delay time is controlled by csd pin of irs2092, capacitor cp3 10. under the normal operating condition with no input signal applied, quiescent current for the positive supply must be less than 50 ma; the negative supply current must be less than 100 ma. switching frequency test: 11. with an oscilloscope, monitor switching waveform at test points vs1 & vs2 adjust p1a & p1b to change self oscillating frequency to 400khz 25khz. note: to change self-oscillating switching frequency, adjust the potentiometer resistances of p11a and p11b for ch1 and ch2 respectively. audio functionality tests: 12. set the signal generator to 1khz, 20 mv rms output. 13. connect audio signal generators to rca1a and rca1b. 14. sweep the audio signal voltage from 15 mv rms to 1 v rms . 15. monitor the output signals at spk1a/b with an oscilloscope. waveform must be a non distorted sinusoidal signal. 16. observe 1 v rms input generates output voltage of 36 v rms . the ratio, r8/(r7+r2), determines the voltage gain of iRAUDAMP7S. 17. set switch s300 to bridged position. 18. observe that voltage gain doubles.
www.irf.com page 8 of 42 iRAUDAMP7S rev 1.3 test setup using audio precision (ap): 19. use unbalance-floating signal generator outputs. 20. use balanced inputs taken across output terminals, spkr1a and spkr1b. 21. connect ap frame ground to gnd in terminal cnn1. 22. place aes-17 filter for all the testing except frequency response. 23. use signal voltage sweep range from 15 mv rms to 1 v rms . 24. run ap test programs for all subsequent tests as shown in fig 2- fig 13 below. test results 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 100m 100 200m 500m 1 2 5 10 20 50 w red = ch1, blue = ch2 b supply = 25v, 4 ? resistive load fig 2 iRAUDAMP7S-55, thd+n versus power, stereo, 4 ? .
www.irf.com page 9 of 42 iRAUDAMP7S rev 1.3 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 100m 200 200m 500m 1 2 5 10 20 50 100 w red = ch1, blue = ch2 b supply = 35v, 4 ? resistive load fig 3 iRAUDAMP7S-100, thd+n versus power, stereo, 4 ? . 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 100m 500 200m 500m 1 2 5 10 20 50 100 200 w b supply = 35v, 8 ? resistive load, bridged fig 4 iRAUDAMP7S-100, thd+n versus power, bridged, 8 ?
www.irf.com page 10 of 42 iRAUDAMP7S rev 1.3 . 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 100m 500 200m 500m 1 2 5 10 20 50 100 200 w red = ch1, blue = ch2 b supply = 50v, 4 ? resistive load fig 5 iRAUDAMP7S-150, thd+n versus power, stereo, 4 ? . 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 100m 700 200m 500m 1 2 5 10 20 50 100 200 w b supply = 50v, 8 ? resistive load fig 6 iRAUDAMP7S-150, thd+n versus power, bridged 8 ? .
www.irf.com page 11 of 42 iRAUDAMP7S rev 1.3 . -10 +4 -8 -6 -4 -2 +0 +2 d b r a 20 200k 50 100 200 500 1k 2k 5k 10k 20k 50k 100k hz red ch1 - 4 ? , 2 v output referenced blue ch1 - 8 ? , 2 v output referenced fig 8 frequency response (all models) .
www.irf.com page 12 of 42 iRAUDAMP7S rev 1.3 0.001 10 0.002 0.005 0.01 0.02 0.05 0.1 0.2 0.5 1 2 5 % 20 20k 50 100 200 500 1k 2k 5k 10k hz t red ch1, 10w output blue ch1, 50w output fig 9 iRAUDAMP7S-150, thd+n versus frequency , 4 ? . -110 +0 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b v 20 20k 50 100 200 500 1k 2k 5k 10k hz red = ch1, blue = ch2 1v output fig 10 iRAUDAMP7S-150, 1 khz ? 1 v output spectrum, stereo .
www.irf.com page 13 of 42 iRAUDAMP7S rev 1.3 -110 +0 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b v 20 20k 50 100 200 500 1k 2k 5k 10k hz 1v output fig 11 iRAUDAMP7S-150, 1 khz - 1v output spectrum, bridged . -140 +20 -120 -100 -80 -60 -40 -20 +0 d b v 10 20k 20 50 100 200 500 1k 2k 5k 10k hz red ch1 - acd, no signal, self oscillator @ 400khz blue ch2 - acd, no signal, self oscillator @ 400khz fig 12 iRAUDAMP7S-150 noise floor .
www.irf.com page 14 of 42 iRAUDAMP7S rev 1.3 clipping characteristics 210 w / 4 , 1 khz, thd+n = 0.02 % 310 w / 4 , 1 khz, thd+n = 10 % measured output and distortion waveforms fig 13 clipping characteristics . efficiency figs 14-19 show efficiency characteristics of the iRAUDAMP7S. the high efficiency is achieved by following major factors: 1) low conduction loss due to the dual fets offering low r ds(on) 2) low switching loss due to the dual fets offering low input capacitance for fast rise and fall times 3) secure dead-time provided by the irs2092, avoiding cross-conduction 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 102030405060 output power (w) efficiency (% ) 25v-4ohms b supply = 25 v fig 14 efficiency versus output power, iRAUDAMP7S-55, 4 ? , stereo . red trace: total distortion + noise voltage gold trace: output voltage
www.irf.com page 15 of 42 iRAUDAMP7S rev 1.3 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 20406080100120140160 output power (w) efficiency (%) 35v-4ohms b supply = 35 v fig 15 efficiency versus output power, iRAUDAMP7S-100, 4 ? , stereo . 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 50 100 150 200 250 300 output power (w) efficiency (% ) 35v-8ohms-full bridge b supply = 35v fig 16 efficiency versus output power, iRAUDAMP7S-100, 8 ? , bridged . 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 0 50 100 150 200 250 300 output power (w) efficiency (%) 50v-4ohms b supply = 50v fig 17 efficiency versus output power, iRAUDAMP7S-150, 4 ? , stereo
www.irf.com page 16 of 42 iRAUDAMP7S rev 1.3 . 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 50 100 150 200 250 300 350 400 450 500 550 output power (w) efficiency (% ) 50v-8ohms-full bridge b supply = 50v fig 18 efficiency versus output power, iRAUDAMP7S-150, 8 ? , bridged . 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 50 100 150 200 250 300 output power (w) efficiency (% ) 70v-8ohms b supply = 70v fig 19 efficiency versus output power, iRAUDAMP7S-200, 8 ? , stereo thermal considerations with this high efficiency, the iRAUDAMP7S design can handle one-eighth of the continuous rated power, which is generally considered to be a normal operating condition for safety standards, without additional heatsink or forced air-cooling. power supply rejection ratio (psrr) the iRAUDAMP7S obtains good power supply rejection ratio of -65 db at 1khz shown in fig 20. with this high psrr, iRAUDAMP7S accepts any power supply topology as far as the supply voltages fit in the min and max range.
www.irf.com page 17 of 42 iRAUDAMP7S rev 1.3 red: vaa & vss are fed by +/-b bus green: vaa & vss are fed by external +/-5 v regulated power supplies. fig 20 iRAUDAMP7S power supply rejection ratio short circuit protection response figs 21-23 show over current protection reaction time of the iRAUDAMP7S in a short circuit event. as soon as the irs2092 detects over current condition, it shuts down pwm. after one second, the irs2092 tries to resume the pwm. if the short circuit persists, the irs2092 repeats try and fail sequences until the short circuit is removed. short circuit in positive and negative load current fig 21 positive and negative ocp waveforms . load current csd p in load current positive ocp csd p in vs p in negative ocp vs p in
www.irf.com page 18 of 42 iRAUDAMP7S rev 1.3 ocp waveforms showing csd trip and hiccup . fig 22 ocp response with continuous short circuit . actual reaction time ocp waveforms showing actual reaction time . fig. 23 high and low side ocp current waveform reaction time iRAUDAMP7S overview the iRAUDAMP7S features a self-oscillating type pwm modulator for the lowest component count, highest performance and robust design. this topology represents an analog version of a second-order sigma-delta modulation having a class d switching stage inside the loop. the load current csd p in load current csd p in vs p in vs p in load current
www.irf.com page 19 of 42 iRAUDAMP7S rev 1.3 benefit of the sigma-delta modulation, in comparis on to the carrier-signal based modulation, is that all the error in the audible frequency range is shifted to the inaudible upper-frequency range by nature of its operation. also, sigma-delta modul ation allows a designer to apply a sufficient amount of error correction. the iRAUDAMP7S self-oscillating topology consists of following essential functional blocks. ? front-end integrator ? pwm comparator ? level shifters ? gate drivers and mosfets ? output lpf integrator referring to fig 24 below, the input operational amplifier of the irs2092 forms a front-end second- order integrator with r7, c4, c6, p1, and r11. the integrator that receives a rectangular feedback signal from the pwm output via r8 and audio input signal via r7 generates quadratic carrier signal in comp pin. the analog input signal shifts the average value of the quadratic waveform such that the duty cycle varies according to the instantaneous voltage of the analog input signal. pwm comparator the carrier signal in comp pin is converted to pwm signal by an internal comparator that has threshold at middle point between vaa and vss. the co mparator has no hysteresis in its input threshold. level shifters the internal input level-shifter transfers the pwm signal down to the low-side gate driver section. the gate driver section has another level-shifter that level shifts up the high-side gate signal to the high-side gate driver section. gate drivers and mosfets the received pwm signal is sent to the dead-time generation block where a programmable amount of dead time is added into the pwm signal between the two gate output signals of lo and ho to prevent potential cross conduction across the output power mosfets. the high-side level- shifter shifts up the high-side gate drive signal out of the dead-time block. the irs2092 drives two mosfets, high- and low-sides, in the power stage providing the amplified pwm waveform.
www.irf.com page 20 of 42 iRAUDAMP7S rev 1.3 output lpf the amplified pwm output is reconstructed back to analog signal by the output lc lpf. demodulation lc low-pass filter (lpf) formed by l1 and c12, filters out the class d switching carrier signal leaving the audio output at the speaker load. a single stage output filter can be used with switching frequencies of 400 khz and greater; a design with a lower switching frequency may require an additional stage of lpf. + - . -b . . r7 in- comp c6 . -vss +vaa lo vs vcc d3 cp6 vb 0v +b 0v r11 c7 r117 cp5 ho c12 input c4 r8 r118 cp2 +vcc integrator com r25 modulator and shift level gnd 0v -b 0v lp filter l1 cp4 r24 irs2092 +b irfi4019h-117p irfi4212h-117p fet1 irfi4020h-117p irfi4024h-117p fig 24 simplified block diagram of iRAUDAMP7S class d amplifier functional descriptions irs2092 gate driver ic the iRAUDAMP7S uses irs2092, a high-voltage (up to 200 v), high-speed power mosfet driver with internal dead-time and protection functions specifically designed for class d audio amplifier applications. these functions include ocp and uvp. the irs2092 integrates bi- directional over current protection for both high-side and low-side mosfets. the dead-time can be selected for optimized performance according to the size of the mosfet, minimizing dead- time while preventing shoot-through. as a result, there is no gate-timing adjustment required externally. selectable dead-time through the dt pin voltage is an easy and reliable function which requires only two external resistors, r26 and r27 as shown on fig 25 below.
www.irf.com page 21 of 42 iRAUDAMP7S rev 1.3 the irs2092 offers the following functions. ? pwm modulator ? dead-time insertion ? over current protection ? under voltage protection ? level shifters refer to irs2092 datasheet and an-1138 for more details. d1 r3 100r r13 10k r12 *7.5k r21 10r r25 20r r24 20r r19 10k r18 *9.1k r22 10k c11 0.1uf,100v r17 *47k +b -b sd vcc r23 10k 10uf cp3 r11 100r c6 1nf c4 1nf r20 4.7r c8 150pf,250v r28 10r lo 11 vs 13 ho 14 vcc 12 gnd 2 vaa 1 com 10 dt 9 ocset 8 in- 3 comp 4 csd 5 vss 6 vref 7 vb 15 csh 16 u1 irs2092s c7 1nf c10 0.1uf,400v 22uf cp6 r7 *3.01k 1% 22uf cp5 cp8 *470uf,100v cp 7 *470uf,100v l1 22uh ch1 out r31 2.2k c13 0.1uf, 400v r30 10, 1w c12 0.47uf, 400v -b +b + - ch1 r8 *120k 1% feedback +vaa 1 2 spkr1 r2 330 rca1 r1 100k blue led1 ch_out c14 0.1uf,100v z10 3 5.6v z104 5.6v r118 *3.3k 1w r114 *1k 1w r115 *15k 1 2 3 q105 tip31c -b +b 3 2 1 fet2 bs250f r14 4.7k red csd1 prot rca1 d3 d4 d5 *mur120rlg d6 *mur120rlg z102 15v r26 10k r27 10k p1 2k pot *irfi4019h-117p 3 5 2 1 4 fet1 hs1 r117 *3.3k 1w 22uf cp101 22uf cp2 22uf cp1 22uf cp4 c9 150pf,250v r29 10r vs1 c2 1nf fig 25 system-level vi ew of iRAUDAMP7S self-oscillating frequency self-oscillating frequency is determined by the total delay time along the control loop of the system; the propagation delay of the irs2092, t he mosfets switching speed, the time-constant of front-end integrator (p1, r7, r11 r8, c4, c6, c7). variations in +b and ?b supply voltages also affect the self-oscillating frequency. the self-oscillating frequency changes with the duty ratio. the frequency is highest at idling. it drops as duty cycle varies away from 50%.
www.irf.com page 22 of 42 iRAUDAMP7S rev 1.3 adjustments of self-oscillating frequency use p1 & r11 to set different self-oscillating frequencies. the pwm switching frequency in this type of self-oscillating switching scheme greatly impacts the audio performance, both in absolute frequency and frequency relative to the other channels. in the absolute terms, at higher frequencies distortion due to switching-time becomes significant, while at lower frequencies, the bandwidth of the amplifier suffers. in relative terms, interference between channels is most significant if the relative frequency difference is within the audible range. normally, when adjusting the self-oscillating frequency of the different channels, it is suggested to either match the frequencies accurately, or have them separated by at least 25khz. under the normal operating condition with no audio input signal, the switching-frequency is set around 400khz in the iRAUDAMP7S . selectable dead-time the dead-time of the irs2092 is set based on the voltage applied to the dt pin. fig 26 lists the suggested component value for each programmable dead-time between 25 and 105 ns. all the iRAUDAMP7S models use dt2 (45ns) dead-time. dead-time mode r1 r2 dt/sd voltage dt1 <10k open vcc dt2 5.6k 4.7k 0.46 x vcc dt3 8.2k 3.3k 0.29 x vcc dt4 open <10k com recommended resistor values for dead time selection vcc 0.57 xvcc 0.36 xvcc 0.23 xvcc 105ns 75ns 45ns 25ns v dt dead- time vcc com dt >0.5ma r1 r2 irs2092(s) fig 26 dead-time settings vs. v dt voltage protection system overview
www.irf.com page 23 of 42 iRAUDAMP7S rev 1.3 the irs2092 integrates over current protection (ocp ) inside the ic. the rest of the protections, such as over-voltage protection (ovp), under-voltage protection (uvp), speaker dc offset protection (dcp) and over temperature protection (o tp), are realized externally to the irs2092 (fig 27). in the event that any of these external fault cond itions are detected, the external shutdown circuit will disable the output by pulling down csd pins, turning on red leds, and turning off blue leds (fig 28). if the fault condition persists, the prot ection circuit stays in shutdown until the fault is removed. once the fault is cleared, the blue leds turn on and red leds turn off. q100 2n3904 ch1 _ o ut ch2 _ o ut -vss1 330uf, 10v cp100 z100 *68v +b -vss1 r112 47k sd dcp ovp uvp otp r103 715r q101 2n3906 th100 is thermally connected with heat sink -vss1 -vss1 +b th1 0 0 2.2k 1 2 3 5 4 6 s1 sw dpdt r104 4.7k r101 4.7k r102 10k c100 0.1uf r113 10k r107 10k r105 10k r1 1 1 10k r108 100k r109 100k r110 100k z101 *39v q104 2n3904 q102 2n3906 q103 2n3906 jw3 r106 10k fig 27 dcp, otp, uvp and ovp protection circuits . . . +vaa ocref ocref 5.1v csd ocset + . lo vs vcc vb csh r19 led1 blue d4 bav19 lp filter prot red cp3 r12 ho ocset com -vss csd 1.2v r18 +b r13 r17 -b fet1 fet2 fig 28 simplified functional diagram of ocp and associated led indicators
www.irf.com page 24 of 42 iRAUDAMP7S rev 1.3 over-current protection (ocp) low-side current sensing the low-side current sensing feature protects the low side mosfet from an overload condition in negative load current by measuring drain-to-source voltage across r ds(on) during its on state. ocp shuts down the switching operation if the drain-to-source voltage exceeds a preset trip level. the voltage setting on the ocset pin programs the thres hold for low-side over-cur rent sensing. when the vs voltage during low-side conduction gets higher t han the ocset voltage, the irs2092 turns off outputs and pulls csd down to -vss. high-side current sensing the high-side current sensing protects the hi gh side mosfet from an overload condition in positive load current by measuring drain-to-source voltage across r ds(on) during its on state. ocp shuts down the switching operation if the drain-to-source voltage exceeds a preset trip level. high-side over-current sensing monitors drain-to-source voltage of the high-side mosfet while it is in the on state through the csh and vs pins. the csh pin detects the drain voltage with reference to the vs pin, which is the source of the high-side mosfet. in contrast to the low-side current sensing, the threshold of csh pin to trigger oc protection is internally fixed at 1.2v. an external resistive divider r19, r18 and r17 are used to program a threshold as shown in fig 26. an external reverse blocking diode d4 is required to block high voltage feeding into the csh pin during low-side conduction. by subtracting a forward voltage drop of 0.6v at d4, the minimum threshold which can be set for the high-side is 0.6v across the drain-to-source. table 2 actual ocp table setting thresholds function device amp7-55 am p7-100 amp7-150 amp7-200 ocset r12a r12b 1.3k 3.9k 7.5k 5.1k tested ocp current 25 o c 23a 30a 23a csh r18a r18b 0.0 4.7k 9.1k 8.2k tested ocp current 25 o c 23a 29a 23a peak load current at rated power 6.0a 8.7a 12.2a 8.9a over-voltage protection (ovp) ovp is provided externally to the irs2092. o vp shuts down the amplifier if the bus voltage between gnd and +b exceeds 75v. the threshold is determined by a zener diode z100. ovp
www.irf.com page 25 of 42 iRAUDAMP7S rev 1.3 protects the board from harmful excessive supply voltages, such as due to bus pumping at very low frequency continuous output in stereo mode. under-voltage protection (uvp) uvp is provided externally to the irs2092. uvp prevents unwanted audible noise output from unstable pwm operation during power up and down. uvp shuts down the amplifier if the bus voltage between gnd and +b falls below a voltage set by zener diode z101. speaker dc-voltage protection (dcp) dcp protects speakers against dc output current feeding to its voice coil. dc offset detection detects abnormal dc offset and shuts down pwm. if this abnormal condition is caused by a mosfet failure because one of the high-side or low-side mosfets short circuited and remained in the on state, the power supply needs to be cut off in order to protect the speakers. output dc offset greater than 4v triggers dcp. offset null (dc offset) adjustment the iRAUDAMP7S requires no output-offset adjustment. dc offsets are tested to be less than 20 mv. over-temperature protection (otp) a ntc resistor, th100 in fig 25, is placed in close proximity to two dual mosfets on a heatsink to monitor heatsink temperature. if the heatsink temperature rises above 100 c, the otp shuts down both channels by pulling down csd pins of the irs2092. otp recovers once the temperature has cooled down. on-off switch off position of s1 forces the iRAUDAMP7S to stay in shutdown mode by pulling down the csd pin. during the shutdown mode the output mosfets are kept off. click and pop noise reduction thanks to the click and pop elimination function built into the irs2092, iRAUDAMP7S does not use any additional components for this function.
www.irf.com page 26 of 42 iRAUDAMP7S rev 1.3 power supply requirements for convenience, the iRAUDAMP7S has all the necessary housekeeping power supplies onboard and only requires a pair of symmetric power supplies. power supply voltage depends on the model and is shown in the power selection in table 1. house keeping power supply the internally-generated housekeeping power supplies include 5.6v for analog signal processing, and +12v supply (v cc ) referred to negative supply rail -b for mosfet gate drive. the vaa and vss supplying floating input section are fed from +b and -b power stage bus supplies via r117 and r118, respectively. gate driver section of irs2092 uses vcc to drive gates of mosfets. the v cc is referenced to ?b (negative power supply). d3 and cp6 form a bootstrap floating supply for the ho gate driver. bus pumping when the iRAUDAMP7S is running in the stereo mode, bus pumping effect takes place with low frequency high output. since the energy flowing in the class d switching stage is bi-directional, there is a period where the class d amplifier feeds energy back to the power supply. the majority of the energy flowing back to the supply is from the energy stored in the inductor in the output lpf. usually, the power supply has no way to absorb the energy coming back from the load. consequently the bus voltage is pumped up, creating bus voltage fluctuations. following conditions make bus pumping worse: 1. lower output frequencies (bus-pumping duration is longer per half cycle) 2. higher power output voltage and/or lower load impedance (more energy transfers between supplies) 3. smaller bus capacitance (the same energy will cause a larger voltage increase) the ovp protects iRAUDAMP7S from failure in case of excessive bus pumping. one of the easiest counter measures of bus pumping is to drive both of the channels in a stereo configuration out-of-phase so that one channel consumes the energy flow from the other and does not return it to the power supply. bus voltage detection monitors only +b supply, assuming the bus pumping on the supplies is symmetric in +b and -b supplies. there is no bus pumping effect in full bridge mode.
www.irf.com page 27 of 42 iRAUDAMP7S rev 1.3 cyan: positive rail voltage (+b), green: s peaker output, pink: negative rail voltage (-b) fig 29 bus pumping in half bridge mode bridged configuration by selecting s300 to bridged position, the irauda mp7s realizes full bridge mode, also known as bridge-tied-load, or btl configuration. full br idge operation is achieved by feeding out-of-phase audio input signals to the two input channels as shown in the fig 30 below. in bridged mode, iRAUDAMP7S receives audio input signal from channel a only. the on-board inverter feed out-of-phase signal to channel b. the speaker output must be connected between (+) of channel a and (+) of channel b in bridged mode. in bridged mode, nominal load impedance is 8 ? . (see power table in table 1) . r3 0 0 22k r302 100 c3 0 0 0.1uf r303 100 c3 0 1 0.1uf +vaa -vss 1 6 5 2 3 8 7 4 u300 tl0 7 2 cp r3 0 1 22k from ch a bridged steereo rca 2 rca 1 jw8 cp 1 b+ from ch b 1 2 3 5 4 6 s300 sw dpdt fig 30 bridged configuration (btl)
www.irf.com page 28 of 42 iRAUDAMP7S rev 1.3 load impedance each channel is optimized for a 4 ? speaker load in half bridge and 8 ? load in full bridge. output filter selection since the output filter is not included in the control loop of the iRAUDAMP7S, the control loop has no ability to compensate performance deterioration caused by the output filter. therefore, it is necessary to understand what characteristics ar e preferable when designing the output filter. 1) the dc resistance of the inductor should be minimized to 20 m ? or less. 2) the linearity of the output inductor and capacitor should be high with output current and voltage. fig 31 demonstrates thd performance difference with various inductors. fig 31 thd+n vs. output power with different kind of output inductors 0.0001 100 0.001 0.01 0.1 1 10 % 100m 200m 500m 1 2 5 10 20 50 100 200 w t t
www.irf.com page 29 of 42 iRAUDAMP7S rev 1.3 input signal and gain setting a proper input signal is an analog signal ranging from 20hz to 20khz with up to 3 v rms amplitude with a source impedance of no more than 600 ? . input signal with frequencies from 30khz to 60khz may cause lc resonance in the output lpf, causing a large reactive current flowing through the switching stage, especially with greater than 8 ? load impedances, and the lc resonance can activate ocp. the iRAUDAMP7S has an rc network called zobel network (r30 and c13) to damp the resonance and prevent peaking frequency response with light loading impedance. (fig 32) the zobel network is not thermally rated to handle continuous supersonic frequencies above 20khz. these supersonic input frequencies can be filtered out by adding r2 and c2 as shown on main schematic fig 33 and fig 34. this rc filter works also as an input rf filter to prevent potential radio frequency interferences. . . . . 0v 0v lp filter l1 c12 r30 c13 fig 32 output low pass filter and zobel network gain setting the ratio of resistors r8/r2 in fig 33 sets voltage gai n. the iRAUDAMP7S has no on board volume control. to change the voltage gain, change the input resistor term r2. changing r8 affects pwm control loop design and may result poor audio performance.
www.irf.com page 30 of 42 iRAUDAMP7S rev 1.3 fig 33 amplifier schematic, channel 1 & channel 2 . d1 r3 100r r13 10k r12 *7.5k r21 10r r25 20r r24 20r r19 10k r18 *9.1k r22 10k c11 0.1uf,100v r17 *47k +b -b sd vcc r23 10k 10uf cp3 r11 100r c6 1nf c4 1nf ch1 r20 4.7r c8 150pf,250v r28 10r lo 11 vs 13 ho 14 vcc 12 gnd 2 vaa 1 com 10 dt 9 ocset 8 in- 3 comp 4 csd 5 vss 6 vref 7 vb 15 csh 16 u1 irs2092s c7 1nf c10 0.1uf,400v 22uf cp6 r7 *3.01k 1% 22uf cp5 cp8 *470uf,100v cp 7 *470uf,100v l1 22uh ch1 out r31 2.2k c13 0.1uf, 400v r30 10, 1w c12 0.47uf, 400v -b +b + - ch1 r8 *120k 1% feedback -vss +vaa 1 2 spkr1 r2 330 rca1 r1 100k blue led1 ch_out c14 0.1uf,100v z103 5.6v z104 5.6v r118 *3.3k 1w r114 *1k 1w r115 *15k 1 2 3 q105 tip31c -b +b 3 2 1 fet2 bs250f r14 4.7k red csd1 prot rca1 d3 d4 d5 *mur120rlg d6 *mur120rlg z102 15v r26 10k r27 10k p1 2k pot *irfi4019h-117p 3 5 2 1 4 fet1 hs1 r117 *3.3k 1w 22uf cp101 22uf cp2 22uf cp1 22uf cp4 c9 150pf,250v r29 10r vs1 c2 1nf note: components values marked on red or * are according to power table iraudamp7-55, +b,-b are +/-25v with fet1 as irfi4024h-117p iraudamp7-100, +b,-b are +/-35v with fet1 as irfi4212h-117p iraudamp7-150, +b,-b are +/-50v with fet1 as irfi4019h-117p iraudamp7-200, +b,-b are +/-70v with fet1 as irfi4020h-117p r2 & c2 are rf filters, optional note: iRAUDAMP7S rev 1.0
www.irf.com page 31 of 42 iRAUDAMP7S rev 1.3 c100 0.1uf q100 mmbt5551 q102 mmbt5401 q104 mmbt5551 q103 mmbt5401 r110 100k r109 100k r108 100k ch2_out ch1_out -vss 330uf,10v cp100 r107 10k z100 *68v z101 *39v +b -vss r105 10k r106 10k r111 10k r112 47k sd r102 10k dcp ovp uvp ot p r113 10k 1 2 3 5 4 6 s1 sw dpdt r101 4.7k r103 715r r104 4.7k q101 mmbt5401 th1 is thermally connected with fet1 -vss -vss jw2 +b jw12 jw3 jw10 jw8 sd sd +b +b -b -b note: components values marked on red or * are according to power table th100 th2.2k jw11 jw7 jw9 vcc vcc vcc vcc -b -b jw4 jw5 fig 34 protection schematic .
www.irf.com page 32 of 42 iRAUDAMP7S rev 1.3 r300 22k r302 100 c300 0.1uf r303 100 c301 0.1uf +vaa -vss 1 6 5 2 3 8 7 4 u300 tlc0 8 1 idr r301 22k from ch a bri dged steereo rca2 rca1 jw1 cp1b+ from ch b 1 2 3 5 4 6 s300 sw dpdt jw6 fig 35 bridge preamp schematic
www.irf.com page 33 of 42 iRAUDAMP7S rev 1.3 iRAUDAMP7S-150 fabrication materials table 3 iRAUDAMP7S-150 electr ical bill of materials quantity value description designator digikey p/n vendor 8 1nf,250v cap cer 1000pf 250v c0g 5% c2a, c2b, c4a, c4b, c6a, c6b, c7a, c7b 445-2325-1-nd tdk corporation 4 150pf,250v cap cer 150pf 250v u2j c8a, c8b, c9a, c9b 490-5025-1-nd murata electronics 4 0.1uf,400v cap .10uf 400v metal polypro c10a, c10b, c13a, c13b 495-1311-nd epcos inc 4 0.1uf,100v cap .10uf 100v ceramic x7r c11a, c11b, c14a, c14b pcc2239ct-nd panasonic - ecg 2 0.47uf, 400v cap .47uf 400v metal polypro c12a, c12b 495-1315-nd epcos inc 3 0.1uf, 10v cap cer 0.1uf 10v sl 5% c100, c300, c301 445-2686-1-nd tdk corporation 1 ed365/3 terminal block 7.50mm 3pos pcb conn1 ed2355-nd on shore technology inc 12 22uf cap 22uf 25v elect vr radial cp1a, cp1b, cp2a, cp2b, cp4a, cp4b, cp5a, cp5b, cp6a, cp6b, cp101a, cp101b 493-1058-nd nichicon 2 10uf, 16v cap elect 10uf 16v ks radial cp3a, cp3b p966-nd panasonic - ecg 4 470uf,100v cap 470uf 100v elect pw radial cp7a, cp7b, cp8a, cp8b 493-1985-nd nichicon 1 330uf, 10v cap 330uf 10v alum lytic radial cp100 p5125-nd panasonic - ecg 2 red led led 3mm hi-eff red transparent csd1a, csd1b 160-1140-nd lite-on inc 2 1n4148ws diode switch 75v 200mw d1a, d1b 1n4148ws-fdict-nd diodes inc 2 mura120t3g diode ultra fast 1a 200v d3a, d3b mura120t3gosct- nd on semiconductor 2 bav19ws diode switch 100v 200mw d4a, d4b bav19ws-fdict-nd diodes inc 4 mura120t3g diode ultra fast 1a 200v d5a, d5b, d6a, d6b mura120t3gosct- nd on semiconductor 2 irfi4019h- 117p irfi4019h-117p, dual mosfet to-220-5 fet1a, fet1b ir's part no. international rectifier 2 bs250p mosfet p-ch 45v 90ma fet2a, fet2b bs250ftc-nd zetex inc 1 heat sink aluminum heat spreader hs1a drawing irhs_amp1 custom made 1 jw-300 wire jumper #20 awg insulated jw1 custom custom 3 jw-300 wire jumper #20 awg insulated jw2, jw4, jw10 custom custom 1 jw-1500 wire jumper #20 awg insulated jw3 custom custom 1 jw-1500 wire jumper #20 awg insulated jw5 custom custom 2 jw-1800 wire jumper #20 awg insulated jw6, jw7 custom custom 2 jw-2000 wire jumper #20 awg insulated jw8, jw9 custom custom 2 22uh, 13a class d inductor, 22uh l1a, l1b sagami 7g17a-220m- r or in09063 inductors, inc. or ice components, inc. 2 blue led led 3mm dual flange blue clear led1a, led1b 160-1600-nd lite-on inc 2 2k pot potentiometer p1a, p1b 3362h-202lf-nd bourns inc. 2 mmbt5551 transistor npn 160v q100, q104 mmbt5551fsct-nd fairchild semiconductor
www.irf.com page 34 of 42 iRAUDAMP7S rev 1.3 3 mmbt5401 trans pnp 150v 350mw smd q101, q102, q103 mmbt5401-fdict-nd diodes inc 2 tip31c transistor npn 100v 3a q 105a, q105b 497-2615-5-nd stmicroelectronics 3 100k res 100k ohm 1/8w 5% r1a, r1b, r110 rhm100karct-nd rohm 1 330 res 330 ohm 1/8w 1% r2a rhm330crct-nd rohm 1 330 res 330 ohm carbon film r2b p330bact-nd panasonic - ecg 2 100r res 100 ohm 1/8w 5% r3a, r3b p100act-nd panasonic - ecg 2 3.01k res 3.01k ohm 1/8w 1% r7a, r7b rhm3.01kcct-nd rohm 2 120k 1% res metal film 120k ohm 1/4w r8a, r8b p120kcact-nd panasonic - ecg 2 100r res 100 ohm 1/8w 5% r11a, r11b rhm100arct-nd rohm 2 7.5k res 7.5k ohm 1/8w 5% r12a, r12b rhm7.5karct-nd rohm 18 10k res 10k ohm 1/8w 5% r13a, r13b, r19a, r19b, r22a, r22b, r23a, r23b, r26a, r26b, r27a, r27b, r102, r105, r106, r107, r111, r113 rhm10karct-nd rohm 4 4.7k res 4.7k ohm 1/8w 5% r14a, r14b, r101, r104 rhm4.7karct-nd rohm 2 47k res 47k ohm 1/8w 5% r17a, r17b rhm47karct-nd rohm 2 9.1k res 9.1k ohm 1/8w 5% r18a, r18b rhm9.1karct-nd rohm 2 4.7r res 4.7 ohm 1/4w 1% r20a, r20b p4.7rct-nd panasonic - ecg 2 10r res 10.0 ohm 1/4w 1% r21a, r21b rhm10.0frct-nd rohm 4 20r res 20.0 ohm 1/8w 1% r24a, r24b, r25a, r25b rhm20.0crct-nd rohm 4 10r res 10.0 ohm 1/8w 1% r28a, r28b, r29a, r29b rhm10.0crct-nd rohm 2 10, 1w res 10 ohm 1w 5% r30a, r30b pt10xct-nd panasonic - ecg 2 2.2k res 2.2k ohm 1/4w 5% r31a, r31b rhm2.2kerct-nd rohm 1 715r res 715 ohm 1/8w 1% r103 rhm715cct-nd rohm 1 100k res 100k ohm 1/8w 5% r108 rhm100karct-nd rohm 1 100k res 100k ohm carbon film 1/4w 5% r109 p100kbatb-nd panasonic - ecg 1 47k res 47k ohm 1/8w 5% r112 rhm47karct-nd rohm 2 1k 1w res 1.0k ohm 1w 5% metal oxide r114a, r114b 1.0kw-1-nd yageo 2 15k res 15k ohm carbon film 1/4w 5% r115a, r115b p15kbact-nd panasonic - ecg 4 3.3k 1w res 3.3k ohm 1w 5% metal oxide r117a, r117b, r118a, r118b 3.3kw-1-nd yageo 2 22k res 22k ohm 1/8w 5% r300, r301 rhm22karct-nd rohm 2 100 res 100 ohm 1/8w 5% r302, r303 rhm100arct-nd rohm 2 rcj-012 conn rca jack metal r/a red pcb rca1a cp-1401-nd (red) cui inc 2 rcj-013 conn rca jack metal r/a wht pcb rca1b cp-1402-nd (white) cui inc 2 eg2209a switch slide dpdt 12v .1a l=4 s1, s300 eg1908-nd e-switch 2 ed365/2 terminal block 7.50mm 2pos pcb spkr1a, spkr1b ed2354-nd on shore technology 1 2.2k at 25c thermistor ntc 2.2k ohm leaded th100 bc2304-nd vishay/bc components 2 irs2092spbf class d controller, irs2092spbf 16-lead soic u1a, u1b ir's p/n international rectifier 1 tlc071cd ic single supply opamp 8-soic u300 296-2414-5-nd irs2092spbf texas instruments 2 15v diode zener 500mw 15v z102a, z102b mmsz4702t1gosct- nd on semiconductor
www.irf.com page 35 of 42 iRAUDAMP7S rev 1.3 1 68v diode zener 375mw 68v z100 568-3782-1-nd nxp semiconductors 1 39v diode zener 500mw 39v z101 bzt52c39-tpmsct- nd micro commercial co 4 5.6v diode zener 500mw 5.6v z103a, z103b, z104a, z104b bzt52c5v6- tpmsct-nd micro commercial co note all ? w and 1w resistors are flame proof part numbers
www.irf.com page 36 of 42 iRAUDAMP7S rev 1.3 table 4 iRAUDAMP7S mechani cal bill of materials quantit y value description designator digikey p/n vendor 5 washer #4 ss washer lock internal #4 ss lock washer 1, lock washer 2, lock washer 3, lock washer 4, lock washer 5 h729- nd building fastener s 1 pcb print circuit board iRAUDAMP7S_rev 2.2 .pcb pcb 1 custom 12 screw 4- 40x5/16 screw machine phillips 4-40x5/16 screw 1, screw 2, screw 3, screw 4, screw 5, screw 6, screw 7, screw 8, screw 9, screw 10, screw 11, screw 12 h343- nd building fastener s 4 stand off 0.5" standoff hex 4- 40thr .500"l alum stand off 1, stand off 2, stand off 3, stand off 4 1893k- nd keystone electro- nics 1 stand off 0.5" standoff hex m/f 4- 40 .500" alum, chassis gnd stand off 5 8401k- nd keystone electro- nics 1 aavid 4880g thermalloy to-220 mounting kit with screw to-220 mounting kit 1 newuark 82k609 6 therm- alloy
www.irf.com page 37 of 42 iRAUDAMP7S rev 1.3 table 5 iRAUDAMP7S mode ls differential table model name item amp7s-55 amp7s-100 amp7s-150 amp7s-200 notes ir power mosfe ts fet1 irfi4024h-117p irfi4212h-117p irfi4019h-117p irfi4020h-117p 8 ? 25 w x 2 60 w x 2 125 w x 2 250 w x 2 stereo half bridge output 4 ? 50 w x 2 120 w x 2 250 w x 2 n/a stereo full bridge output 8 ? 100 w x 1 240 w x 1 500 w x 1 n/a bridged +b, -b 25 v 35 v 50 v 70 v power supply b voltage range 3 v 5 v 8 v 10 v audio gain gain 20 30 36 40 feedbac k r8a,r8 b 68k 100k 120k 130 k +vaa r117a* r117b* 1 k, 1 w 2.2 k, 1 w 3.3 k, 1 w 5.1 k, 1 w -vss r118a* r118b* 1 k, 1 w 2.2 k, 1 w 3.3 k, 1 w 5.1 k, 1 w r114a* r114b* 100,1 w 220, 1 w 1 k, 1 w 2.2 k 1 w vcc r115a r115b 4.7 k 10 k 15 k 20 k ocset r12a r12b 1.3 k (20 a) 3.9 k (23 a) 7.5 k (30 a) 5.1 k (23 a) (trip level) csh r18a r18b 0.0 (20a) 4.7 k (23a) 9.1 k (29a) 8.2 k (23 a) (trip level) vb r17a r17b 20 k 33 k 47 k 75 k ovp z100 24 v bzt52c24- tpmsct-nd 47 v mmsz5261bt1go sct-nd 68 v 568-3782-1-nd 91 v mmsz5270bt1g osct-nd zener digikey p/n uvp z101 12 v mmsz5242bt1go sct-nd 30 v mmsz5256bt1go sct-nd 39 v bzt52c39- tpmsct-nd 51 v mmsz5262bt1g osct-nd zener digikey p/n clampin g diode d5a d5b d6a d6b mura120t3osct- nd mura120t3osct- nd imura120t3os ct-nd n/a * marked components are axial, 5 %, ? w, and flame proof type.
www.irf.com page 38 of 42 iRAUDAMP7S rev 1.3 iRAUDAMP7S hardware screw lock washers h729-nd dual fet to-220-5 pcb lock washer screws h343-nd heatsink threaded heatsink threaded heat sink screw lock washer put silicone grease between the heat spreader and to-220-5 flat washer #4 fig 36 dual mosfet mounting screw lock washer pcb screw to-220 pad insulator lock washer heatsink threaded heatsink threaded heat sink screws h343-nd to-220 flat washer #4 shoulder washer lock washers h729-nd fig 37 +vcc regulator to-220 mounting
www.irf.com page 39 of 42 iRAUDAMP7S rev 1.3 fig 38 heat spreader . screw screw h343-nd screws h343-nd stand off 3 1893k-nd stand off 5 8401k-nd screw stand off 4 1893k-nd lock washers h729-nd lock washer lock washer incert thermistor into this hole and put silicone grease stand off 1 1893k-nd stand off 2 1893k-nd lock washer screw h343-nd lock washer screw h343-nd lock washer gnd standoff screw h343-nd lock washer fig 39 hardware assemblies
www.irf.com page 40 of 42 iRAUDAMP7S rev 1.3 iRAUDAMP7S pcb specifications pcb: 1. single layers smt pcb with through holes 2. 1/16 thickness 3. 2/0 oz cu 4. fr4 material 5. 10 mil lines and spaces 6. solder mask to be green enamel emp110 dbg (carapace) or enthone endplate dsr-3241or equivalent. 7. top silk screen to be white epoxy non conductive per ipc?rb 276 standard. 8. all exposed copper must finished with tin-lead sn 60 or 63 for 100u inches thick. 9. tolerance of pcb size shall be 0.010 ?0.000 inches 10. tolerance of all holes is -.000 + 0.003? 11. pcb acceptance criteria as defined for class ii pcb?s standards. gerber files apertures description: all gerber files stored in the attached cd-rom were generated from protel altium designer altium designer 6. each file name extension means the following: 1. .gbl bottom copper, bottom side 2. .gto top silk screen 3. .gbo bottom silk screen 4. .gbs bottom solder mask 5. .gko keep out, 6. .gm1 mechanical 7. .gd1 drill drawing 8. .gg1 drill locations 9. .txt cnc data 10. .apr apertures data additional files for assembly that may not be related with gerber files: 11. .pcb pcb file 12. .bom bill of materials 13. .cpl components locations 14. .sch schematic 15. .csv pick and place components 16. .net net list 17. .bak back up files 18. .lib pcb libraries
www.irf.com page 41 of 42 iRAUDAMP7S rev 1.3 fig 40 iRAUDAMP7S pcb top overlay (top view) fig 41 iRAUDAMP7S pcb bottom layer (top view)
www.irf.com page 42 of 42 iRAUDAMP7S rev 1.3 revision changes descriptions revision changes description date rev 1.1 released sep, 03 2008 rev 1.2 rohs compliant(bom updated) may, 29 2009 rev 1.3 bom updated :ice components as a second vender of the inductor october 28, 2009 world headquarters: 233 kansas st., el segundo, calif ornia 90245 tel: (310) 252-7105 data and specifications subject to change without notice. 08/29/2008
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