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?2001 fairchild semiconductor corporation www.fairchildsemi.com rev.1.0.1 features wide operating frequency range up to 150khz pulse by pulse over current limiting over load protection over voltage protection (min. 23v) internal thermal shutdown function under voltage lockout internal high voltage sense fet external sync terminal latch up mode description the sps product family is specially designed for an off-line smps with minimal external components. the sps consist of high voltage power sensefet and current mode pwm control- ler ic. pwm controller features integrated fixed oscillator, under voltage lockout, leading edge blanking, optimized gate turn-on/turn-off driver, thermal shut down protection, over volt- age protection, temperature compensated precision current sources for loop compensation and fault protection circuit. compared to discrete mosfet and controller or rcc switch- ing converter solution, a sps can reduce total component count, design size, weight and at the same time increase & efficiency, productivity, and system reliability. it has a basic platform well suited for cost effective design in monitor power supply. to-3p-5l 1. drain 2. gnd 3. v cc 4. fb 5. sync internal block diagram #3 v cc 32v 2 a 5v 2.5r 1r 1ma 0.1v + ? over voltage s/d + ? 7.5v 25v thermal s/d s r q power on reset + ? l.e.b s r q osc 5v vref internal bias good logic sfet #1 drain #2 gnd #4 fb #5 sync 9v + ? 6.4v ka2s0680b fairchild power switch(sps)
ka2s0680b 2 absolute maximum ratings notes: 1. tj=25 c to 150 c 2. repetitive rating: pulse width limited by maximum junction temperature 3. l=24mh, v dd =50v, r g =25 ? , starting tj=25 c 4. l=13 h, starting tj=25 c parameter symbol value unit maximum drain voltage (1) v d,max 800 v drain-gate voltage (r gs =1m ? )v dgr 800 v gate-source (gnd) voltage v gs 30 v drain current pulsed (2) i dm 24.0 a dc single pulsed avalanche energy (3) e as 455 mj avalanche current (4) i as 20 a continuous drain current (t c =25 c) i d 6.0 a dc continuous drain current (t c =100 c) i d 4.0 a dc maximum supply voltage v cc,max 30 v input voltage range v fb ? 0.3 to v sd v total power dissipation p d 150 w derating 1.21 w/ c operating ambient temperature t a ? 25 to +85 c storage temperature t stg ? 55 to +150 c
ka2s0680b 3 electrical characteristics (sfet part) (ta=25 c unless otherwise specified) note: pulse test: pulse width 300 s, duty cycle 2% parameter symbol condition min. typ. max. unit drain-source breakdown voltage bv dss v gs =0v, i d =50 a 800 - - v zero gate voltage drain current i dss v ds =max., rating, v gs =0v --50 a v ds =0.8max., rating, v gs =0v, t c =125 c - - 200 a static drain-source on resistance (note) r ds(on) v gs =10v, i d =4.0a - 1.6 2.0 ? forward transconductance (note) gfs v ds =15v, i d =4.0a 1.5 2.5 - s input capacitance ciss v gs =0v, v ds =25v, f=1mhz - 1600 - pf output capacitance coss - 140 - reverse transfer capacitance crss - 42 - turn on delay time t d(on) v dd =0.5bv dss , i d =6.0a (mosfet switching time are essentially independent of operating temperature) -60- ns rise time tr - 150 - turn off delay time t d(off) - 300 - fall time tf - 130 - total gate charge (gate-source+gate-drain) qg v gs =10v, i d =6.0a, v ds =0.5bv dss (mosfet switching time are essentially independent of operating temperature) -70- nc gate-source charge qgs - 16 - gate-drain (miller) charge qgd - 27 - s 1 r --- - =
ka2s0680b 4 electrical characteristics (control part) (ta=25 c unless otherwise specified) notes: 1. these parameters, although guaranteed, are not 100% tested in production 2. these parameters, although guaranteed, are tested in eds (wafer test) process 3. the amplitude of the sync. pulse is recommended to be between 2v and 3v for stable sync. function. parameter symbol condition min. typ. max. unit uvlo section start threshold voltage v start -141516v stop threshold voltage v stop after turn on 9 10 11 v oscillator section initial accuracy f osc ta=25 c182022khz frequency change with temperature (2) ? f/ ? t ? 25 c ta +85 c- 5 10 % maximum duty cycle dmax - 92 95 98 % feedback section feedback source current i fb ta=25 c, vfb=gnd 0.7 0.9 1.1 ma shutdown feedback voltage v sd -6.97.58.1v shutdown delay current idelay ta=25 c, 5v vfb v sd 1.4 1.8 2.2 a sync. & soft start section soft start voltage v ss v fb =2v 4.7 5.0 5.3 v soft start current i ss sync & s/s=gnd 0.8 1.0 1.2 ma sync threshold voltage (3) v syth vfb=5v 6.0 6.4 6.8 v reference section output voltage (1) vref ta=25 c 4.80 5.00 5.20 v temperature stability (1)(2) vref/ ? t ? 25 c ta +85 c-0.30.6mv/ c current limit (self-protection) section peak current limit i over max. inductor current 3.52 4.00 4.48 a protection section thermal shutdown temperature (tj) (1) t sd - 140 160 - c over voltage protection voltage v ovp -232528v total device section start up current i start v cc =14v 0.1 0.3 0.55 ma operating supply current (control part only) i op ta=25 c 6 12 18 ma v cc zener voltage v z i cc =20ma 30 32.5 35 v
ka2s0680b 5 typical performance characteristics (these characteristic graphs are normalized at ta=25 c) fig.1 operating frequency 0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 -25 0 25 50 75 100 125 150 fosc fig.2 feedback source current 0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 -25 0 25 50 75 100 125 150 ifb fig.3 operating current 0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 -25 0 25 50 75 100 125 150 iop fig.4 max inductor current 0.8 0.85 0.9 0.95 1 1.05 1.1 -25 0 25 50 75 100 125 150 ipeak fig.5 start up current 0.5 0.7 0.9 1.1 1.3 1.5 -25 0 25 50 75 100 125 150 is tart fig.6 start threshold voltage 0.85 0.9 0.95 1 1.05 1.1 1.15 -25 0 25 50 75 100 125 150 vs ta rt temperature [ c ] temperature [ c ] temperature [ c ] temperature [ c ] temperature [ c ] temperature [ c ] figure 1. operating frequency figure 2. feedback source current figure 3. operating supply current figure 4. peak current limit figure 5. start up current figure 6. start threshold voltage i over i st v th(h) l op
ka2s0680b 6 typical performance characteristics (continued) (these characteristic graphs are normalized at ta=25 c) fig.7 stop threshold voltage 0.85 0.9 0.95 1 1.05 1.1 1.15 -25 0 25 50 75 100 125 150 vs to p fig.8 maximum duty cycle 0.85 0.9 0.95 1 1.05 1.1 1.15 -25 0 25 50 75 100 125 150 dmax fig.9 vcc zener voltage 0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 -25 0 25 50 75 100 125 150 vz fig.10 shutdown feedback voltage 0.85 0.9 0.95 1 1.05 1.1 1.15 -25 0 25 50 75 100 125 150 vs d fig.11 shutdown delay current 0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 -25 0 25 50 75 100 125 150 idelay fig.12 over voltage protection 0.85 0.9 0.95 1 1.05 1.1 1.15 -25 0 25 50 75 100 125 150 vo vp temperature [ c ] temperature [ c ] temperature [ c ] temperature [ c ] temperature [ c ] temperature [ c ] figure 7. stop threshold voltage figure 8. maximum duty cycle figure 9. v cc zener voltage figure 10. shutdown feedback voltage figure 11. shutdown delay current figure 12. over voltage protection v th(l)
ka2s0680b 7 typical performance characteristics (continued) (these characteristic grahps are normalized at ta=25 c) figure 13. soft start voltage figure 14. static drain-source on resistance fig.13 soft start voltage 0.85 0.9 0.95 1 1.05 1.1 1.15 -25 0 25 50 75 100 125 150 vs s fig.14 drain source turn-on resistance 0 0.5 1 1.5 2 2.5 -25 0 25 50 75 100 125 150 rdson temperature [ c ] temperature [ c ] ()
ka2s0680b 8 package dimensions to-3p-5l
ka2s0680b 9 package dimensions (continued) to-3p-5l (forming)
ka2s0680b 10 ordering information tu : non forming type ydtu : forming type product number package rating operating temperature ka2s0680b-tu to-3p-5l 800v,6a -25 c to +85 c KA2S0680B-YDTU to-3p-5l(forming)
ka2s0680b 11
ka2s0680b 2/5/01 0.0m 001 stock#dsxxxxxxxx ? 2001 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president 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. www.fairchildsemi.com 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.

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