KA3502 Datasheet | Fairchild Semiconductor

.fairchildsemi. PC SMPS Supervisory IC Features - - - - - - - - - - plete Housekeeping Circuit Few External ponents Over Voltage Protection for 3.3V/5V/12V/Adj. Output Over Current Protection for 3.3V/5V/12V Output Open-Collector Output and Remote On/Off Function Remote On/Off Delay Time Control Precision Voltage Reference for Outputs, 5V/12V Unmitment Precision Voltage Reference for +5Vs Power Good Signal Generator with Hysteresis Disable Logic of 3.3V, 5V, 12V for plete Shutdown Descriptions The KA3502 is plete housekeeping circuitry for use in the secondary side of SMPS(Switched Mode Power Supply). It contains various functions, which are two Precision Voltage References, Over Voltage/Current Protection, Remote On/Off Control, Power Good Signal Generator, Disable Logic and etc. 20-DIP Internal Block Diagram V33 V5 V12 1 2 3 PWM FB1 VREF1 UV 14 11 6 15 VCC 5 R3 R1 R5 Vcc Adj 4 R2 R4 R6 + + + + 1.26V P1 Ion R8 1k R10 39k Ichg R15 5.1k 9 R9 10k R13 Vcc 5.2V + P9 Q3 Tsur 17 2.7V IS5 19 -+ 50m V IS33 20 -+ 135m V IS12 18 Vcc + P2 Vcc + P3 Vcc...