? 2011, scillc. all rights reserved. www.onsemi.com publication order number: jan-2011, rev. 0 la4625/d la4625 overview the la4625 is a 2-channel general-purpos e btl audio power amplifier provided in a miniature package. it was designed for the best possible audio quality and features an extended lo w band roll-off frequency provided by a newly-developed nf circuit that does not require an external capacitor. furtherm ore, crosstalk, which can cause muddiness in the audio output, has been significantly reduced by both circuit and wiring pa ttern improvements. thus this amplifier can provide powerful lows and clear highs. note that this device is pin compatible with the 20w2-ch annel la4628, and allows end products differentiated by their power rating to share the same printed circuit board. features ? total output : 13.5w + 13.5w (at v cc = 12v, r l = 4 , thd = 10%) ? pmpo reference data : 115w2 (v cc = 20v, r l = 4 ) ? high-fidelity design (f l < 10hz, f h = 130khz) ? extremely low impulse noise levels ? an arbitrary amplifier startup time can be set up with external components. ? full complement of built-in protection circuits (includes circuits that protect against shorting to v cc , shorting to ground, load shorting, overvoltages and excessive temperatures) specifications maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage v cc max no signal 24 v maximum output current i o peak per channel 3.5 a allowable power dissipation pd max with an arbitrarily large heat sink 32.5 w operating temperature topr -20 to +85 c storage temperature tstg -40 to +150 c monolithic linear ic 2-channel 13.5w btl audio power amplifier orderin g number : en6631a
la4625 rev. 0 | page 2 of 8 | www.onsemi.com operating conditions at ta = 25 c parameter symbol conditions ratings unit recommended supply voltage v cc 12 v recommended load resistance range r l op 4 to 8 allowable operating supply voltage v cc op 7.2 to 20 v note : with v cc , r l , and the output level in ranges such that th e pd max for the heat sink used is not exceeded. electrical characteristics at ta = 25c, v cc = 12v, r l = 4 , f = 1khz, rg = 600 ratings parameter symbol conditions min typ max unit quiescent current i cco rg = 0 65 120 240 ma standby mode current drain i st standby mode (amplifier off), with no power supply capacitor. 10 60 a voltage gain v g v o = 0dbm 38 40 42 db total harmonic distortion thd p o = 1w, filter = flat 0.06 0.2 % output power p o 1 thd = 10% 10 13.5 w output offset voltage v n offset rg = 0 -300 +300 mv output noise voltage v no rg = 0, bpf = 20hz to 20khz 0.1 0.5 mv ripple rejection ratio svrr rg = 0, v r = 0dbm, f r = 100hz 40 50 db channel separation chsep rg = 10k , v o = 0dbm 50 60 db input resistance ri 21 30 39 k standby pin applied voltage v st amplifier on (applied through an external 10k resistor) 2.5 v cc v package dimensions unit : mm (typ) 3113b 0 pd max -- ta -20 35 25 30 15 20 10 5 20 0 40 60 80 100 120 140 160 f = 3 ? c/w f = 4 ? c/w f = 7 ? c/w jc = 2 ? c/w ? fin f = 10 ? c/w 32.5 20.83 13.9 10.4 3.1 infinite heat sink allowable power dissipation, pd max -- w ambient temperature, ta -- ? c ai heat sink mounting torque 39n ? cm flat washer silicone grease applied
la4625 rev. 0 | page 3 of 8 | www.onsemi.com block diagram 0.1 f 0.1 f r4 c9** c8** r5 2.2 2.2 r l 4 r l 4 -out2 +out2 ? + standby sw off ripple filter + bias circuit standby sw pop noise prevention circuit predriver predriver power power load short protector output pin to v cc short protector output pin to v cc short protector output pin to gnd short protector output pin to gnd short protector predriver predriver power power over voltage / surge protector thermal shut down load short protector v cc + + on r1 10k +5v c4 2.2 f 10v 33 f 10v 0.47 f 10v 2.2 f 10v c1 100 f/16v v cc c5 2200 f 25v + -out1 +out1 ? + power gnd2 + + c3 c10 ** (polyester film capacitor) + ? in c2 pre gnd in2 c3 c10 sets the amplifier starting time (approximately 0.6 seconds when 33 f) impulse noise reduction (note : the device?s ability to withstand shorting to v cc or shorting to ground when v cc is around 16v may be reduced as the value of this capacitor is increased. we recommend 0.47 f.) power gnd1 14 2 1 3 4 6 7 5 11 12 13 0.1 f 0.1 f r2 c7** c6** r3 2.2 2.2 9 10 8 + ? in
la4625 rev. 0 | page 4 of 8 | www.onsemi.com pin voltages v cc = 12v, with 5v applied to stby through a 10k resistor, r l = 4 , rg = 0 pin no. 1 2 3 4 5 6 7 pin name in1 dc pre-gnd stby on time in2 pop pin voltage 1.46v 5.18v 0v 3.21v 2.26v 1.46v 2.05v pin no. 8 9 10 11 12 13 14 pin name + out2 ? out2 pwr-gn + out1 pwr-gn ? out1 v cc pin voltage 5.21v 5.21v 0v 5.21v 0v 5.21v 12v external components c1 and c4: input capacitors. a value of 2.2 f is recommended. determine the polarity based on the dc potential of the circuit connected directly to the la4625 front end. note that the low band response can be adjusted by varying f l with the capacitors c1 and c4. c2 : decoupling capacitor (ripple filter) c3 : sets the amplifier starting time, which will be approximately 0.6 seconds for a value of 33 f. the starting time is proportional to the value of this capacitor, and can be set to any desired value. c5 : power-supply capacitor c6, c7, c8, and c9 : oscillation prevention capacitors. use polyester film capacitors (mylar capacitors) with excellent characteristics. (note that the series resistors r2, r3, r4, and r5 are used in conjunction with these capacitors to achieve stable ampl ifier operation.) a value of 0.1 f is recommended. c10 : impulse noise reduction capacitor. a value of 0.47 f is recommended. caution is required when selecting the value for this capacitor, since increasing its value influences the operation of the circuits that protect against shorting the amplifier output pins to v cc or to ground when higher v cc voltages (approximately 16v or higher) are used. r1 : standby switch current limiting resistor. a value of 10k is recommended when a voltage in the range 2.5 to 12v will be applied as the standby switching voltage. note that this resistor is not optional: it must be included. ic internal characteristics and notes 1. standby function ? pin 4 is the standby switch. a voltage of 2.5v or higher must be applied through an external resistor to turn the amplifier on. ? if a voltage of over 12v will be applied as the standby mode switching voltage, use the following formula to determine the value of r1 so that the current entering at pin 4 remains under 500 a. < applied voltage > ? 1.4 r1 = 500 a ? 10k 2. muting function ? pin 5 connects the capacitor that determines the starting tim e to prevent impulse noise. it can also be used to mute the amplifier output by shorting pin 5 to ground. when this function is used, the recovery time depends on c3. 3. impulse noise improvements ? while the la4625 achieves a low level of impulse noise, if even further reductions in impulse noise at power on/off (and when switching into or out of standby mode) a 0.47 f capacitor may be inserted between pin 7 and the pre gnd pin (pin 3). (pin 7 is the output amplifier bias pin. since the ability to withstand shorting the output pins to v cc or ground is reduced for supply voltages over 16v if the pin 7 capacitance is large, we recommend a value of 0.47 f or lower for this capacitor.) 4 r1 10k 500 a or lower about 1.4v (2v be ) pin 4 internal equivalent circuit applied standby voltage
la4625 rev. 0 | page 5 of 8 | www.onsemi.com 4. protection circuits ? due to the system structure of the protection circuit for shorts to v cc or ground, if there is a dc resistance between the amplifier output pins and ground, the protec tion circuit may operate when power is first applied and the amplifier may fail to turn on. the basic design approach we recommend is not to adopt any designs in which there is a dc resistance between the amplifier outputs and ground. ? the la4625 includes a built-in thermal protection circuit to prevent the ic from being damaged or destroyed if abnormally high temperatures occur. this thermal protec tion circuit gradually reduces the output if the ic junction temperature (tj) r eaches the range 170 to 180 c due to inadequate heat sinking or other problem. if the temperature falls, the amplifier will restart automatically. ? the la4625 also includes other protection circuits. use of these circuits also requires care during end product design and testing. 5. other notes ? the la4625 is a btl power amplifier. when testing this device, the ground systems for the test equipment connected to ic inputs, and that for the test equipment connected to ic outputs, must be isolated. do not use a common ground. printed circuit pattern (copper foil side)
la4625 rev. 0 | page 6 of 8 | www.onsemi.com thd = 30% 10% p o -- v cc 6 0 10 20 30 40 50 60 7 8 9 101112131415161718 f = 1khz rg = 600 r l = 4 10khz 100khz 1khz thd -- p o 2 0.1 0.01 3 2 7 5 1.0 3 2 7 5 10 3 2 7 5 35 1.0 0.1 7235 10 7235 100 7 v cc = 12v r l = 4 rg = 600 thd -- f 2 0.1 0.01 3 2 7 5 1.0 3 2 7 5 10 3 2 7 5 35 100 10 7235 1k 7235 10k 7235 100k 7 v cc = 12v r l = 4 p o = 1w v no -- rg 2 0.1 0.01 3 2 7 5 1.0 3 2 7 5 35 1k 100 7235 10k 7235 100k 7 v cc = 12v r l = 4 p o -- v in 23 57 0.01 0.1 2 3 5 7 1.0 2 3 5 7 10 2 3 5 7 100 2 3 5 7 1.0 10 23 57 100 23 57 1k v cc = 12v r l = 4 f = 1khz thd = 10% thd = 3% thd = 1% p o -- f 23 57 0 4 8 12 16 20 24 10 100 23 57 1k 23 57 10k 23 57 100k v cc = 12v r l = 4 rg = 600 f response 23 57 -10 -8 -6 -4 -2 0 2 10 100 23 57 1k 23 57 10k 23 57 100k v o = 0dbm at f = 1khz chsep -- f 90 80 70 60 50 40 30 20 10 0 23 7 5 100 10 23 7 5 1k 23 7 5 10k 23 7 5 100k v cc = 12v r l = 4 rg = 10k v o = 0dbm v cc = 12v r l = 4 rg = 600 output power, p o -- w supply voltage, v cc -- v output power, p o -- w total harmonic distortion, thd -- % frequency, f -- hz total harmonic distortion, thd -- % signal source resistance, rg -- output noise voltage, v no -- mvrms input voltage, v in -- mvrms output power, p o -- w frequency, f - - hz output power, p o -- w frequency, f -- hz response -- db frequency, f -- hz channel separation, chsep -- db ch1 ? 2 ch2 ? 1
la4625 rev. 0 | page 7 of 8 | www.onsemi.com out2 out1 svrr -- v cc 4 -120 -100 -80 -60 -40 -20 0 6 7 8 10121416182022 rg = 0 f r = 100hz v ccr = 0dbm v n -- v cc 0 5 10 15 20 25 30 35 0 2 4 6 8 10 12 r l = 4 rg = 0 v n -- v out1 out2 svrr -- f r 23 57 -100 -80 -60 -40 -20 0 10 100 23 57 1k 23 57 10k 23 57 100k v cc = 12v v ccr = 0dbm r l = 4 rg = 0 i cco -- v cc 0 4 8 12162024283236 0 20 40 60 80 100 120 140 160 180 r l = open rg = 0 pd , i cc -- p o 2 10 1.0 3 2 7 5 100 3 2 7 5 1.0 3 2 7 5 10 3 2 7 5 35 1.0 0.1 7235 10 7235 100 7 r l = 4 rg = 600 f = 1khz v cc = 15v i cc v cc = 12v amp on time 0 0.2 0.4 0.6 0.8 1.0 23 57 1.0 10 23 57 100 c3 -- f v cc = 12v v st = 5v amp on time -- s 100hz out1 3khz out1 3khz out2 svrr = 20log v o v ccr 100hz out2 svrr -- v ccr 0 -100 -80 -60 -40 -20 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 v cc = 12v r l = 4 0.1 ripple rejection ratio, svrr -- db supply voltage, v cc -- v ripple frequency, f r -- hz ripple rejection ratio, svrr -- db supply voltage, v cc -- v quiescent current, i cco -- ma output power, p o -- w/ch power dissipation, pd -- w power dissipation, i cc -- a ripple rejection ratio, svrr -- db power supply ripple, v ccr -- vrms supply voltage, v cc -- v
la4625 la4625/d on semiconductor and the on logo are registered trademarks of semiconductor components industries, llc (scillc). scillc reserve s the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any partic ular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation sp ecial, consequential or incidental damages. scillc strives to supply high-quality high-reliability products and recommends adopting safety measures when designing equipment to avoid accidents or m alfunctions. such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. ?typical? parameter s which may be provided in scillc data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including ?typic als,? must be validated for each customer application by customer?s technical experts. scillc shall not be held liable for any claim or suits with regard to a third party?s intellectual property rights which has resulted from the use of the technical information and products mentioned above. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any o ther application in which the failure of the scillc product could create a situation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or u nauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distri butors harmless against all claims, costs, damages, and expens es, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scil lc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this li terature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information literature fulfillment: literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone: 303-675-2175 or 800-344-3860 toll free usa/canada fax: 303-675-2176 or 800-344-3867 toll free usa/canada email: orderlit@onsemi.com n. american technical support: 800-282-9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81-3-5773-3850 on semiconductor website: www.onsemi.com order literature: http://www.onsemi.com/orderlit for additional information, please contact your local sales representative
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