UC3875A

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

2 of 10

www.unisonic.com.tw

QW-R103-127.E



MARKING

DIP-8

SOP-8



PIN CONFIGURATION



PIN DESCRIPTION

PIN NO. PIN NAME PIN TYPE

DESCRIPTION

1

RI

I

A resistor connected between RI and GND sets switching frequency. A 100kΩ

2

FB

I

Feedback input pin. The PWM duty cycle is determined by voltage level into this

pin and SENSE pin input.

3

CS

I

Current sense input pin. Connected to MOSFET current sensing resistor node.

4

GND

P

Ground.

5

OUT

O

The totem-pole output driver for driving the power MOSFET.

6

P

Power supply.

7

NC

-

No Connection

8

HV

I

HV start pin, it connected the line input.