UC3846
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO.
PIN NAME
GATE
VDD
PIN TYPE
DESCRIPTION
1
2
3
O
P
The totem-pole output driver for driving the power MOSFET.
Power supply.
NC
NC pin.
Current sense input pin. Connected to MOSFET current sensing resistor
node.
4
SENSE
I
I
A resistor connected between RI and GND sets switching frequency. A
100kΩ resistor Ri results in a 70kHz switching frequency.
5
6
7
8
RI
NC
NC pin.
Feedback input pin. The PWM duty cycle is determined by voltage level
into this pin and SENSE pin input.
Ground.
FB
I
GND
P
UNISONIC TECHNOLOGIES CO., LTD
2 of 10
QW-R103-053.B
www.unisonic.com.tw