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| US1651 Datasheet, PDF (2/7 Pages) Unisonic Technologies – PRIMARY-SIDE REGULATION PWM POWER SWITCH | |||
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US1651
ï® MARKING
Preliminary
CMOS IC
ï® PIN CONFIGURATION
VDDG 1
VDD 2
INV 3
CS 4
8 GND
7 GND
6 Drain
5 Drain
ï® PIN DESCRIPTION
PIN NO.
1
2
3
4
5, 6
7, 8
PIN NAME
VDDG
VDD
INV
CS
Drain
GND
DESCRIPTION
Internal gate driver power supply
IC DC power supply input
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.
Current sense input
HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the transformer
Ground
ï® BLOCK DIAGRAM
VDD
2
VDDG
1
5/6 Drain
Regulator & Por
Vref
OVP
30V
Logic
core
Drive
Power
MOSFET
Softstart
CC/CV
controller
LEB
INV 3
1.25V
PWM
0.82V
4 CS
7/8
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 7
QW-R129-005.a
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