UC3843A

UNISONIC TECHNOLOGIES CO., LTD UC3842A/3843A LINEAR INTEGRATED CIRCUIT HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS  DESCRIPTION The UTC UC3842A/3843A are high performance fixed frequency current mode controllers that specifically designed for Off-Line and DC to DC converter applications with minimal external parts count. The differences between UC3842A and UC3843A are the under-voltage lockout thresholds. The UC3842A ideally suited to off-line applications with UVLO thresholds of 16V(ON) and 10V(OFF), and UC3843A has UVLO thresholds of 8.4V(ON) and 7.6V(OFF) for lower voltage applications.  FEATURES * Operation output switching frequency up to 500 kHz * Automatic feed forward compensation * Latching PWM for cycle-by-cycle current limiting * High current totem pole output * Internally trimmed reference with under voltage lockout * UVLO with hysteresis * Low startup and operating current  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 www.unisonic.com.tw Copyright © 2022 Unisonic Technologies Co., Ltd 1 of 7 QW-R103-002.M UC3842A/3843A  MARKING PACKAGE UC3842A DIP-8 SOP-8  PIN CONFIGURATION LINEAR INTEGRATED CIRCUIT UC3843A  PIN DESCRIPTION PIN NO 1 2 3 4 5 6 7 8 PIN NAME Compensation VFB ISENSE RT/CT GND Output VCC VREF FUNCTION Error ampli...