KA3882C

www.fairchildsemi.com KA3882C/KA3883C SMPS Controller Features Low Start Current 0.2mA (Typ) Operating Range Up To 500kHz Cycle by Cycle Current Limiting Under Voltage Lock Out With Hysteresis Short Shutdown Delay Time: Typ.100ns High Current Totem-Pole Output Output Swing Limiting: 22V Description The KA3882C/KA3883C is a fixed PWM controller for Off Line and DC to DC converter applications. The internal circuits include an UVLO, a low start up current circuit, a temperature compensated reference, a high gain error amplifier, a current sensing comparator, and the high current totem-pole output for driving a POWER MOSFET. Also the KA3882C/KA3883C provides low start-up current below 0.3mA and short shutdown delay time typ. 100ns. The KA3882C has the UVLO threshold of 16V (on) and 10V(off). The KA3883C is 8.4V(on) and 7.6V(off). The KA3882C and KA3883C can operate within 100% duty cycle. 8-DIP 1 8-SOP 1 Internal Block Diagram 7 VCC 29V VREF 8 Internal Bias 1/2VREF 5V VREF SET/ RESET UVLO 5 GND Good LOGIC 7 PWR VC VFB 2 Error Amp + - C.S PWM Comp. LATCH 1/3 1V S R 22V 6 OUTPUT COMP 1 5 PWR C.S 3 RT/CT 4 T GND OSCILLATOR Rev. 1.0.1 ©2002 Fairchild Semiconductor Corporation KA3882C/KA3883C Absolute Maximum Ratings Parameter Supply Voltage Output Current Analog Inputs (pin 2, 3) Error Amp. Output Sink Current Power Dissipation Thermal Resistance, Junction-to-Air (Note4) 8-SOP 8-DIP Storage Temperature Symbol VCC IO VI(ANA) ISINK(EA) PD Rθja Tst...