UPSL101

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

2 of 7

www.unisonic.com.tw

QW-R125-027.a

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PIN CONFIGURATION

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PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

1

ZCD

Zero current detection pin. A negative going edge triggers the turn on signal of the

external MOSFET, connected this pin through a resistor divider from the auxiliary winding

to GND. If ZCD voltage is higher than the over voltage protection (OVP) threshold, the

over voltage condition is detected.

2

OCP_TH

OCP threshold level selecting pin. Connected an external resistor to ground to select the

OCP threshold voltage.

3

MULT

One of the input pin of the internal multiplier. Connected this pin to the tap of resister

divider from the line voltage. The half waves sinusoid signal in this pin is provided a

reference signal for the internal current control loop.

4

COMP

Loop compensation pin. Connect a compensation network to stabilize the LED driver and

achieve a constant LED driver current.

5

CS

Current sense input pin. The MOSFET current is sensed via a resister.

6

GND

Ground pin.

7

GATE

Gate drive output pin.

8

DC supply voltage pin.

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BLOCK DIAGRAM

Regulator &

Por

OVP

Logic

core

Soft

drive

GND

COMP

4V

Tdemag

0.4V

LEB

PWM

Ipk

GATE

MULT

ZCD

CS

OCP_TH