UC3842B View Datasheet(PDF) - Unisonic Technologies

Part Name

Description

Manufacturer

UC3842B

HIGH PERFORMANCE CURRENT MODE CONTROLLERS

Unisonic Technologies 

UC3842B/3843B

LINEAR INTEGRATED CIRCUIT

„ TYPICAL APPLICATION CIRCUIT

Open Loop Test Circuit

All of the parameters are not all tested in production, although been guaranteed. The timing and bypass capacitors

must be connected to pin 5 in a single point ground very closely. To sample the oscillator waveform, the transistor

and 5kΩ potentiometer are used, and also can apply an adjustable ramp to ISENSE pin.

4.7K

2N

2222

UTC

RT

UC3842B/3843B

1 COMP

100K

VREF 8

2 VFB

VC 7

VREF

A

V1

E/A 1K

ADJUST

ISENSE 5K

ADJUST

4.7K

CT

3 ISENSE

OUTPUT 6

4 RT/CT

GND 5

0.1

0.1

OUTPUT

1K/1W

Under Voltage Lockout

Under-Voltage Lock-Out: the output driver is biased to a high impedance state. To prevent activating the power

switch with output leakage current, pin 6 should be shunted to ground with a bleeder resistor.

Error Amp Configuration

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

6 of 11

QW-R103-012.D

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