UC3973

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

2 of 10

www.unisonic.com.tw

QW-R103-086.B



MARKING



PIN CONFIGURATION



PIN DESCRIPTION

PIN NO.

PIN NAME

PIN TYPE

DESCRIPTION

1

GND

P

Ground.

2

FB

I

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

into this pin and SENSE pin input.

3

VIN

I

Connected through a start up resistor to line voltage for VCC ON

4

NC

-

No Connection

5

RT

I

Connected through a NTC resistor to GND for OTP.

6

SENSE

I

Current sense input pin. Connected to MOSFET current sensing resistor

node.

7

P

Power supply.

8

GATE

O

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