L3012

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

4 of 5

www.unisonic.com.tw

QW-R125-025. b



FUNCTION DESCRIPTION

The UTC L3012 is a current mode and fixed frequency (280kHz) LED driver.

1. Output current setting

100mV).

S

SENSE

IN

OUT

R

V

V

I





=100mV/Rs

2. Current limiting

UTC L3012 has internal current limiting function, and the voltage on COMP is clamped at about 2V, the output

current of the power MOSFET is limited at about 2A by current comparator.

3. Diode Selection

UTC L3012 driver LED need a Schottky diode. If output current is 700mA or smaller then SS14 (D1N5819) is ok.

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TYPICAL APPLICATION CIRCUIT

1

2

3

4

8

7

6

5

SW

GND

SENSE

ADJ

PWM

COMP

SBD

Rs

Cout

L

10µF

1µF

100nF