UC3849B

LINEAR INTEGRATED CIRCUIT

UNISONIC TECHNOLOGIES CO., LTD

2 of 10

www.unisonic.com.tw



M ARK I N G

DIP-8

SOP-8



PI N CON FI GU RAT I ON

GND

FB

NC

GATE

SENSE

RT

1

2

3

4

8

7

6

5



PI N DESCRI PT I ON

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

I

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

4

NC

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.