Datasheet > L3012_15

L3012_15

更新时间： 2024-10-29 01:16:47

品牌	Logo	应用领域
友顺 - UTC		/
页数	文件大小	规格书
5页	170K
描述
LINEAR INTEGRATED CIRCUIT

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L3012_15 数据手册

L3012

LINEAR INTEGRATED CIRCUIT



FUNCTION DESCRIPTION

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

1. Output current setting

The output current is determined by the sampling resistor (R_S) and setting voltage (V_IN-V_SENSEa built-in fixed

100mV).

V_IN V_SENSE

I_OUT



=100mV/Rs

R_S

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 SS14W (1N5819) is ok.

The average current through the diode is I_D:

I_D= (1-D)·I_LED

I_LEDis the current of LED

4. PWM dimming

UTC L3012 has internal PWM dimming function. When PWM voltage is connects to high level, the chip is working

normally, when PWM voltage is open or connects to low level, the COMP pin voltage will keep normal state, so can

improve the startup speed of the chip. Adjust the output current by control the duty of external PWM signal.

The minimum setup time of UTC L3012 PWM dimming is less than 20μS, and the maximum PWM dimming ratio

is up to 500:1. When high dimming ratio is needed, the dimming frequency is recommended 500Hz below, or else

the dimming frequency can be up to 2KHz. When PWM pin is low, output is shutdown.



TYPICAL APPLICATION CIRCUI

ADJ

V_DD

GND

SBD

Cout

SENSE

PWM

V_IN

COMP

1µF

100nF

10µF

UNISONIC TECHNOLOGIES CO., LTD

4 of 5

QW-R125-025.D

www.unisonic.com.tw

1 2 345

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