UC3842A

UNISONIC TECHNOLOGIES CO., LTD UC3842A/3843A LINEAR INTEGRATED CIRCUIT CURRENT MODE PWM CONTROL CIRCUITS  DESCRIPTION The UTC UC3842A/3843A provide the necessary functions to implement off-line or DC to DC fixed frequency current mode, controlled switching circuits with minimal external components.  FEATURES *Low Start Up Current ( Typical 0.12mA ) *Automatic Feed Forward Compensation *Pulse-by-Pulse Current Limiting *Under-voltage Lockout with Hysteresis *Double Pulse Suppression *High Current Totem Pole Output to Drive MOSFET Directly *Internally Trimmed Band Gap Reference *500kHz Operation  ORDERING INFORMATION Ordering Number Lead Free Halogen Free UC3842AL-D08-T UC3842AP-D08-T UC3842AL-S08-R UC3842AP-S08-R UC3843AL-D08-T UC3843AP-D08-T UC3843AL-S08-R UC3843AP-S08-R Package DIP-8 SOP-8 DIP-8 SOP-8 Packing Tube Tape Reel Tube Tape Reel  MARKING Package DIP-8 UC3842A SOP-8 www.unisonic.com.tw Copyright © 2019 Unisonic Technologies Co., Ltd UC3843A 876 5 UTC UC3843A 1 23 4 Date Code L: Lead Free P: Halogen Free Lot Code 1 of 9 QW-R103-002.J UC3842A/3843A  PIN CONFIGURATION COMP 1 VFB 2 Current Sense 3 RT/CT 4  BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT 8 VREF 7 VCC 6 Output 5 GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 9 QW-R103-002.J UC3842A/3843A LINEAR INTEGRATED CIRCUIT  ABSOLUTE MAXIMUM RATINGS (TA=25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Supply Voltage(Low Impedance Source) VCC 30 V Su...