US1651

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 7

www.unisonic.com.tw

QW-R129-005.a



MARKING



PIN CONFIGURATION

1

2

3

4

8

7

6

5

INV

CS

GND

GND

Drain

Drain



PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

Internal gate driver power supply

2

IC DC power supply input

3

INV

Inverting input of error amplifier (EA). Connected to resistor divider from primary sensing

winding reflecting output voltage. PWM duty cycle is determined by EA output and

current sense signal at pin 4.

4

CS

Current sense input

5, 6

Drain

HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the transformer

7, 8

GND

Ground



BLOCK DIAGRAM

Regulator &

Vref

Por

OVP

30V

PWM

CC/CV

controller

LEB

Logic

core

0.82V

INV

GND

CS

Drain

Drive

Softstart

Power

MOSFET

3

2

1

5/6

4

7/8

1.25V