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november 2006 fan7602 green current mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 fan7602 green current mode pwm controller features ? green current mode pwm control ? fixed 65khz operation with frequency modulation ? internal high-voltage start-up switch ? burst mode operation ? line voltage feed forward to limit maximum power ? line under-voltage protection ? latch protection & internal soft-start (10ms) function ? overload protection ? over-voltage protection ? low operation current: typical 1ma ? 8-pin dip/sop applications ? adapter ? lcd monitor power ? auxiliary power supply related application notes ? an6014 - green current mode pwm controller fan7602 description the fan7602 is a green current mode pwm controller. it is specially designed for of f-line adapter application, dvdp, vcr, lcd monitor application, and auxiliary power supplies. the internal high-voltage start-up switch and the burst- mode operation reduce the power loss in standby mode. because of the internal st art-up switch and the burst mode, it is possible to s upply 0.5w load, limiting the input power to under 1w when the input line voltage is 265v ac . on no-load condition, the input power is under 0.3w. the maximum power can be limited constantly, regard- less of the line voltage change, using the power limit function. the switching frequency is internally fixed at 65khz and the frequency modulation technique reduces emi. the fan7602 includes various protections for the sys- tem reliability and the internal soft-start prevents the out- put voltage overshoot at start-up. ordering information part number operating temp. range pb-free package packing method marking code fan7602n -25 c to +125 cyes 8-dip rail fan7602 fan7602m 8-sop rail fan7602 fan7602mx tape & reel fan7602
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 2 typical appli cation diagram figure 1. typical flyback application fan7602 rev. 02 fan7602 internal block diagram figure 2. functional block diagram of fan7602 soft- start delay circuit gnd plimit offset 5v ref v cc luvp out cs/fb uvlo luvp 6 19v ovp 12v/8v 5 3 0.95v/0.88v 8 1 reset circuit 4 v str 2v/1.5v 4v latch/ plimit 2 plimit offset generator driver circuit latch olp olp 10ms soft start ss end 65khz clock with frequency modulation auto restart protection latch protection latch ovp olp pwm block power limit soft-start pwm+ plimit offset plimit offset v cc ss end fan7602 rev. 03
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 3 pin assignments figure 3. pin configuration (top view) pin definitions pin number pin name pin function description 1luvp line under-voltage protection pin. this pin is used to protect the set when the input voltage is lower than the rated input voltage range. 2 latch/plimit latch protection and power limit pin. when the pin voltage exceeds 4v, the latch protection works. the latch protection is reset when the v cc voltage is lower than 5v. for the power limit function, the over-cur rent protection (ocp) level decreases as the pin voltage increases. 3cs/fb current sense and feedback pin. this pin is used to sense the mosfet current for the current mode pwm and ocp. the output voltage feedback information and the current sense information are added using an external rc filter. 4gnd ground pin. this pin is used for the ground pot ential of all the pins. for proper oper- ation, the signal ground and the power ground should be separated. 5out gate drive output pin. this pin is an output pin to drive an external mosfet. the peak sourcing current is 450ma and the peak sinking current is 600ma. for proper operation, the stray inductance in the ga te driving path must be minimized. 6v cc supply voltage pin. ic operating current and mosf et driving current are supplied using this pin. 7nc no connection. 8v str start-up pin. this pin is used to supply ic operating current during ic start-up. after start-up, the internal jfet is turned off to reduce power loss. fan7602 1 2 6 5 8 7 yww 3 4 latch/ plimit gnd cs/fb luvp v str nc v cc out fan7602 rev. 03
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 4 absolute maximum ratings the ?absolute maximum ratings? are those values beyond wh ich the safety of the device cannot be guaranteed. the device should not be operated at these limits. the parametric values defined in the electrical characteristics tables are not guaranteed at the absolute maximum ratings. thermal impedance note: 1. regarding the test environment and pcb type, please refer to jesd51-2 and jesd51-10. symbol parameter value unit v cc supply voltage 20 v i oh , i ol peak drive output current + 450/-600 ma v cs/fb cs/fb input voltage -0.3 to 20 v v luvp luvp input voltage -0.3 to 10 v v latch latch/plimit input voltage -0.3 to 10 v v str v str input voltage 600 v t j operating junction temperature 150 c t a operating temperatur e range -25 to 125 c t stg storage temperature range -55 to 150 c p d power dissipation 1.2 w v esd_hbm esd capability, human body model 2.0 kv v esd_mm esd capability, machine model 300 v v esd_cdm esd capability, charged device model 500 v symbol parameter value unit ja (1) thermal resistance, junction-to-ambient 8-dip 100 c/w
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 5 electrical characteristics v cc = 14v, t a = -25c~125c, unless otherwise specified. note: 2. these parameters, although guaranteed by design, are not tested in production. symbol parameter condition min. typ. max. unit start up section i str v str start-up current v str = 30v, t a = 25 c 0.7 1 1.4 ma under voltage lock out section v th (start) start threshold voltage v cc increasing 11 12 13 v v th (stop) stop threshold voltage v cc decreasing 7 8 9 v hy(uvlo) uvlo hysteresis 3.6 4 4.4 v supply current section i st start-up supply current t a = 25c 250 320 a i cc operating supply current ou tput no switching 1 1.5 ma soft-start section t ss soft-start time (2) 51015ms pwm section f osc operating frequency v cs/fb = 0.2v, t a = 25 c596573khz f frequency modulation 2khz v cs/fb1 cs/fb threshold voltage t a = 25c 0.9 1.0 1.1 v t d propagation delay to output (2) 100 150 ns d max maximum duty cycle 70 75 80 % d min minimum duty cycle 0 % burst mode section v cs/fb2 burst on threshold voltage t a = 25c 0.84 0.95 1.06 v v cs/fb3 burst off threshold voltage t a = 25c 0.77 0.88 0.99 v power limit section k plimit offset gain v latch/plimit = 2v, t a = 25 c 0.12 0.16 0.20 output section v oh output voltage high t a = 25c, isource = 100ma 11.5 12 14 v v ol output voltage low t a = 25c, isink = 100ma 1 2.5 v t r rising time (2) t a = 25c, cl = 1nf 45 150 ns t f falling time (2) t a = 25c, cl = 1nf 35 150 ns
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 6 electrical characteristics (continued) v cc = 14v, t a = -25c~125c, unless otherwise specified. note: 3. these parameters, although guaranteed by design, are not tested in production. symbol parameter condition min. typ. max. unit protection section v latch latch voltage 3.6 4 4.4 v t olp overload protection time (3) 20 22 24 ms t olp_st overload protection time at start-up 30 37 44 ms v olp overload protection level 0 0.1 v v luvpoff line under-voltage protection on to off t a = 25c 1.9 2 2.1 v v luvpon line under-voltage protection off to on t a = 25c 1.4 1.5 1.6 v v ovp over voltage protection t a = 25c 18 19 20 v
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 7 typical performance characteristics figure 4. start threshold voltage vs. temp. figure 6. uvlo hysteresis vs. temp. figure 8. operating supply current vs. temp. figure 5. stop threshold voltage vs. temp. figure 7. start-up supply current vs. temp. figure 9. v str star-up current vs. temp. -25 0 25 50 75 100 125 11.2 11.6 12.0 12.4 12.8 v th [v] temperature [c] -25 0 25 50 75 100 125 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 uvlo hysteresis [v] temperature [c] -25 0 25 50 75 100 125 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 i op [ma] temperature [c] -25 0 25 50 75 100 125 7.2 7.6 8.0 8.4 8.8 v tl [v] temperature [c] -25 0 25 50 75 100 125 150 200 250 300 350 i st [ a] temperature [c] -25 0 25 50 75 100 125 0.8 0.9 1.0 1.1 1.2 1.3 i str [ma] temperature [c]
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 8 typical performance characteristics (continued) figure 10. burst on/off voltage vs. temp. figure 12. offset gain vs. temp. figure 14. ovp voltage vs. temp. figure 11. operating frequency vs. temp. figure 13. maximum du ty cycle vs. temp. figure 15. latch voltage vs. temp. -25 0 25 50 75 100 125 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 cs/fb threshold [v] temperature [c] csfb2 csfb3 -25 0 25 50 75 100 125 0.10 0.12 0.14 0.16 0.18 0.20 kplimit temperature [c] -25 0 25 50 75 100 125 18.0 18.4 18.8 19.2 19.6 20.0 v ovp [v] temperature [c] -25 0 25 50 75 100 125 60 62 64 66 68 70 f osc [khz] temperature [c] -25 0 25 50 75 100 125 70 72 74 76 78 80 d max [%] temperature [c] -25 0 25 50 75 100 125 3.6 3.8 4.0 4.2 4.4 v latch [v] temperature [c]
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 9 typical performance characteristics (continued) figure 16. luvp on to off voltage vs. temp. figure 18. cs/fb threshold voltage vs. temp. figure 17. luvp off to on voltage vs. temp. -25 0 25 50 75 100 125 1.90 1.95 2.00 2.05 2.10 v luvpoff [v] temperature [c] -25 0 25 50 75 100 125 0.92 0.96 1.00 1.04 1.08 csfb1 threshold voltage [v] temperature [c] -25 0 25 50 75 100 125 1.40 1.45 1.50 1.55 1.60 1.65 1.70 v luvpon [v] temperature [c]
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 10 applications information 1. start-up circuit and soft-start block the fan7602 contains a start-up switch to reduce the power loss of the external start-up circuit of the conven- tional pwm converters. the internal start-up circuit charges the v cc capacitor with 0.9ma current source if the ac line is connected. the start-up switch is turned off 15ms after ic starts up, as shown in figure 19. the soft- start function starts when the v cc voltage reaches the start threshold voltage of 12v and ends when the internal soft-start voltage reaches 1v. the internal start-up circuit starts charging the v cc capacitor again if the v cc volt- age is lowered to the minimum operating voltage, 8v. the uvlo block shuts down the output drive circuit and some blocks to reduce the ic operating current and the internal soft-start volta ge drops to zero. if the v cc volt- age reaches the start threshold voltage, the ic starts switching again and the soft-start block works as well. during the soft-start, pulse -width modulated (pwm) com- parator compares the cs/fb pin voltage with the soft- start voltage. the soft-start voltage starts from 0.5v and the soft-start ends when it reaches 1v and the soft-start time is 10ms. the start-up s witch is turned off when the soft-start voltage reaches 1.5v. figure 19. start-up current and v cc voltage 2. oscillator block the oscillator frequency is set internally and a frequency modulation (fm) function reduces emi. the average fre- quency is 65khz and the modulation frequency is 2khz. the frequency varies from 63khz to 67khz with 16 steps. the frequency step is 250hz and fm frequency is 125hz, as shown in figure 20. 3. current sense and feedback block the fan7602 performs the current sensing for the cur- rent mode pwm and the output voltage feedback with only one pin, pin 3. to achieve the two functions with one pin, an internal leb (leading edge blanking) circuit to fil- ter the current sense noise is not included because the external rc filter is necessary to add the output voltage feedback information and the current sense information. figure 21 shows the current sense and feedback circuits. r s is the current sense resist or to sense the switch cur- rent. the current sense information is filtered by an rc filter composed of r f and c f . according to the output voltage feedback information, i fb charges or stops charg- ing c f to adjust the offset voltage. if i fb is zero, c f is dis- charged through r f and r s to lower the offset voltage. figure 20. frequency modulation figure 22 shows typical voltage waveforms of the cs/fb pin. the current sense waveform is added to the offset voltage as shown in the figure. the cs/fb pin voltage is compared with pwm + that is 1v - plimit offset as shown in figure 22. if the cs/fb voltage meets pwm+, the out- put drive is shut off. as s hown in figure 22, if the feed- back offset voltage is low, the switch on time is increased. if the feedback offset voltage is high, the switch on time is decreased. in this way, the duty cycle is controlled according to the output load condition. in gen- eral, the maximum output power increases as the input voltage increases because the current slope during switch on-time increases. to limit the output power of the converter constantly, the power limit function is included in the fan7602. sensing the converter input voltage through the latch/plimit pin, the plimit offset voltage is subtracted from 1v. as shown in figure 22, the plimit off- set voltage is subtracted from 1v and the switch on-time decreases as the plimit offset voltage increases. if the converter input voltage increases, the switch on-time decreases, controlling the output power constant. the offset voltage is proportional to the latch/plimit pin volt- age and the gain is 0.16. if the latch/plimit voltage is 1v, the offset voltage is 0.16v. figure 21. current sense and feedback circuits t soft-start time (10ms) 12v 8v v cc start-up current soft-start voltage 1v 1.5v 0.5v 5ms fan7602 rev. 02 63khz 67khz 16 steps 1 step=250hz 125hz fan7602 rev. 02 soft-start cs/fb 3 pwm comparator v cc c f r f r s r fb i fb i sw plimit offset power limit pwm+ fan7602 rev. 02
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 11 figure 22. cs/fb pin voltage waveforms 4. burst mode block the fan7602 contains the burst mode block to reduce the power loss at a light load and no load as the fan7601. a hysteresis comparator senses the offset voltage of the burst+ for the burst mode as shown in fig- ure 23. the burst+ is the sum of the cs/fb voltage and plimit offset voltage. t he fan7602 enters the burst mode when the offset voltage of the burst+ is higher than 0.95v and exits the burst mode when the offset voltage is lower than 0.88v. the offset voltage is sensed during the switch off time. figure 23. burst mode block 5. protection block the fan7602 contains several protection functions to improve system reliability. 5.1 overload protection the fan7602 contains the overload protection function. if the output load is higher than the rated output current, the output voltage drops and the feedback error amplifier is saturated. the offset of the cs/fb voltage represent- ing the feedback information is almost zero. as shown in figure 24, the cs/fb voltage is compared with 50mv reference when the internal clock signal is high and, if the voltage is lower than 50mv, the olp timer starts counting. if the olp condition persists for 22ms, the timer generates the olp signal. and this protection is reset by the uvlo. the olp block is enabled after the soft-start finishes. figure 24. overload protection circuit 5.2 line under-voltage protection if the input voltage of the converter is lower than the min- imum operating voltage, the converter input current increases too much, causing components failure. there- fore, if the input voltage is low, the converter should be protected. in the fan7602, the luvp circuit senses the input voltage using the luvp pin and, if this voltage is lower than 2v, the luvp signal is generated. the com- parator has 0.5v hysteresis. if the luvp signal is gener- ated, the output drive blo ck is shut down, the output voltage feedback loop is saturated, and the olp works if the luvp condition persists more than 22ms. figure 25. line uvp circuit 5.3 latch protection the latch protection is provided to protect the system against abnormal conditions using the latch/plimit pin. the latch/plimit pin can be used for the output over- voltage protection and/or other protections. if the latch/ plimit pin voltage is made higher than 4v by an external circuit, the ic is shut down. the latch protection is reset when the v cc voltage is lower than 5v. 5.4 over-voltage protection (ovp) if the v cc voltage reaches 19v, the ic shuts down and the ovp protection is reset when the v cc voltage is lower than 5v. 6. output drive block the fan7602 contains a single totem-pole output stage to drive a power mosfet. the drive output is capable of up to 450ma sourcing current and 600ma sinking cur- rent with typical rise and fall time of 45ns, 35ns respec- tively with a 1nf load. pwm+ cs/fb gnd on time fb offset 1v power limit offset (a) low power limit offset case pwm+ cs/fb gnd on time fb offset 1v power limit offset (b) high power limit offset case fan7602 rev. 02 cs/fb delay circuit 3 + ? 0.95v/0.88v burst+ offset fan7602 rev. 02 olp 50mv 22ms timer soft-start clock cs/fb 3 fan7602 rev. 02 2v/1.5v 1 + ?
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 12 typical appli cation circuit features ? low stand-by power (<0.3w @ 265v ac ) ? constant output power control key design notes ? all the ic-related components should be placed close to ic, especially c107 and c110. ? if r106 value is too low, there can be subharmonic oscillation. ? r109 should be designed carefully to make the v cc voltage higher than 8v when the input voltage is 265v ac at no load. ? r110 should be designed carefully to make the v cc voltage lower than ovp level when the input voltage is 85v ac at full load. ? r103 should be designed to keep the mosfet vds voltage lo wer than maximum rating when the output is shorted. 1. schematic figure 26. schematic application output power input voltage output voltage adapter 48w universal input (85~265v ac ) 12v fuse ac input c101 lf1 c102 rt101 bd101 c105 c202 d204 l201 r204 r103 r101 5 6 7 8 nc vstr v cc out luvp cs/fb latch/ plimit gnd fan7602 1 2 3 4 r205 c203 r203 r202 r201 c201 d102 ic201 op1 r111 r104 d103 r106 q101 t1 c106 d101 r105 ic101 c110 r113 c107 c204 r206 d202 c109 c103 c104 c222 1 2 3 4 c108 5 6 1 3 12 9 r207 zd201 r108 op2 1 2 3 4 r109 r112 r102 r107 1 2 3 r110 zd101 r114 fan7602 rev. 02
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 13 2. inductor schematic diagram figure 27. inductor schematic diagram 3. winding specification 4. electrical characteristics 5. core & bobbin ? core: eer2828 ? bobbin: eer2828 ? ae(mm 2 ): 82.1 no pin (s f) wire turns winding method np1 3 20.3 2 31 solenoid winding insulation: polyester tape t = 0.03mm, 2 layers shield 5 copper tape 0.9 not shorted insulation: polyester tape t = 0.03mm, 2 layers ns 12 90.65 3 10 solenoid winding insulation: polyester tape t = 0.03mm, 2 layers shield 5 copper tape 0.9 not shorted insulation: polyester tape t = 0.03mm, 2 layers n vcc 6 50.2 1 10 solenoid winding insulation: polyester tape t = 0.03mm, 2 layers np2 2 10.3 2 31 solenoid winding outer insulation: polyester tape t = 0.03mm, 2 layers pin specification remarks inductance 1 - 3 607 h 100khz, 1v inductance 1 - 3 15 h 9 - 12 shorted np1 5 6 1 2 12 9 3 n vcc ns np2 shied 5 shied 5 fan7602 rev. 02 3mm 3mm ns np1 np2 n vcc ns shield ns shield fan7602 rev. 02
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 14 6. demo circuit part list part value note part value note fuse capacitor fuse 1a/250v c101 220nf/275v box capacitor ntc c102 150nf/275v box capacitor rt101 5d-9 c103, c104 102/1kv ceramic resistor c105 150 f/400v electrolytic r102, r112 10m 1/4w c106 103/630v film r103 56k 1/2w c107 271 ceramic r104 150 1/4w c108 103 ceramic r105 1k 1/4w c109 22 f/25v electrolytic r106 0.5 1/2w c110 473 ceramic r107 56k 1/4w c201, c202 1000 f/25v electrolytic r108 10k 1/4w c203 102 ceramic r109 0 1/4w c204 102 ceramic r110 1k 1/4w c222 222/1kv ceramic r111 6k 1/4w mosfet r113 180k 1/4w q101 fqpf8n60c fairchild r114 50k 1/4w diode r201 1.5k 1/4w d101, d102 uf4007 fairchild r202 1.2k 1/4w d103 1n5819 fairchild r203 20k 1/4w d202, d204 fypf2010dn fairchild r204 27k 1/4w zd101, zd201 1n4744 fairchild r205 7k 1/4w bd101 kbp06 fairchild r206 10 1/2w tnr r207 10k 1/4w r101 471 470v ic filter ic101 fan7602 fairchild lf101 23mh 0.8a ic201 ka431 fairchild l201 10 h4.2a op1, op2 h11a817b fairchild
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 15 7. pcb layout figure 28. pcb layout recommendations for fan7602 8. performance data 85v ac 110v ac 220v ac 265v ac input power at no load 105 .4mw 119.8mw 1 84.7mw 205.5mw input power at 0.5w load 739.4mw 761.4mw 8 25.4mw 872.2mw olp point 4.42a 4.66a 4.6a 4.4a minimize loop area separate power and signal ground minimize leakage inductance fan7602 1 2 6 5 8 7 yww 3 4 latch/ plimit gnd cs/fb luvp v str nc v cc out place these cap. close to ic dc link pulsating high current signal level low current fan7602 rev. 02
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 16 mechanical dimensions 8-dip dimensions are in inches (millimeter s) unless otherwise noted. figure 29. 8-lead dual in-line package (dip)
fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 17 mechanical dimensions (continued) 8-sop dimensions are in millimeters unless otherwise noted. figure 30. 8-lead small outline package (sop)
trademarks the following are registered and unregistered trademarks fairchild semiconductor owns or is authorized to use and is not intend ed to be an exhaustive list of all such trademarks. acex globaloptoisolator ocxpro p serdes tinybuck activearray gto optologic ? silent switcher ? tinylogic ? bottomless hisec optoplanar smart start tinyopto build it now i 2 c pacman spm tinypower coolfet i-lo pop stealth tinypwm crossvolt implieddisconnect power247 superfet trutranslation dome intellimax poweredge supersot -3 uhc ? ecospark isoplanar powersaver supersot -6 ultrafet ? e 2 cmos littlefet powertrench ? supersot -8 unifet ensigna microcoupler qfet ? syncfet vcx fact ? microfet qs tcm wire fact quiet series micropak qt optoelectronics tinyboost fast ? microwire quiet series fastr msx rapidconfigure across the board. around the world. fps msxpro rapidconnect programmable active droop frfet ocx scalarpump the power franchise ? disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. these specifications do not expand the terms of fairchilds worldwide terms and conditions, specifically the warranty therein, which covers these products. life support policy fairchilds products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. product status definitions definition of terms datasheet identification product status definition advance information formative or in design this datasheet contains the design specifications for product development. specifications may change in any manner without notice. preliminary first production this datasheet contains preliminary data; supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice to improve design. no identification needed full production this datasheet contains final specifications. fairchild semiconductor reserves the right to make changes at any time without notice to improve design. obsolete not in production this datasheet contains specifications on a product that has been discontinued by fairchild semiconductor. the datasheet is printed for reference information only. rev. i21 fan7602 green curren t mode pwm controller ? 2006 fairchild semiconductor corporation www.fairchildsemi.com fan7602 rev. 1.0.2 18

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