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UC3842A

UTC
Part Number UC3842A
Manufacturer UTC
Description CURRENT MODE PWM CONTROLLER
Published Apr 19, 2020
Detailed Description UNISONIC TECHNOLOGIES CO., LTD UC3842A/3843A LINEAR INTEGRATED CIRCUIT HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS ...
Datasheet PDF File UC3842A PDF File

UC3842A
UC3842A

Overview
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 amplifier output, this pin is made available for loop compensation.
Voltage Feedback, the inverting input of the Error Amplifier.
It is normally connected to the switching power supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input.
The PWM uses this information to terminate the output switch conduction.
The Oscillator frequency and maximum output duty cycle are programmed by connecting resistor RT to VREF and capacitor CT to ground.
Operation...


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