KA3885

KA3882/3/4/5 SMPS CONTROLLER CURRENT MODE PWM CONTROLLER The KA3882/3/4/5 are fixed PWM controller for Off-Line and DC to DC converter applications. The internal circuits include UVLO, low start up current circuit, temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totempole output for driving a POWER MOSFET. Also KA 3882/3/4/5 provide low start up current below 0.3mA and short shutdown delay time typ. 100ns. The KA3882 and KA3884 have UVLO threshold of 1 6V(on) and 10V(off). The KA3883 and KA3885 are 8.4V(on) and 7.6V(off). The KA3882 and KA3883 can operate within 100% duty cycle. The KA3884 and KA3885 within 50% by using T Flip-Flop. 8 DIP 8 SOP 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 Totempole Output Output Swing Limiting: 22V ORDERING INFORMATION Device KA388X KA388XD Package 8 DIP 8 SOP Operating Temperature 0 ~ + 85 0 ~ + 85 Î Î BLOCK DIAGRAM Rev. B ©1999 Fairchild Semiconductor Corporation KA3882/3/4/5 SMPS CONTROLLER ABSOLUTE MAXIMUM RATINGS Characteristic Supply Voltage Output Current Analog Inputs (pin 2, 3) Error Amp. Output Sink Current Power Dissipation Symbol VCC IO VI(ANA) ISINK(EA) PD Value 30 +1 - 0.3 to 6.3 10 1 Unit V A V mA W ELECTRICAL CHARACTERISTICS (VCC = 15V, RT = 10K `, C T = 3.3nF, T A = 0 Îto + 85Î, Unless otherwise...