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L3012L-S08-R 数据表(PDF) 4 Page - Unisonic Technologies

部件名 L3012L-S08-R
功能描述  1A HIGH POWER LED DRIVER WITH 4.5~40V INPUT
PDF  5 Pages
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制造商  UTC [Unisonic Technologies]
网页  http://www.utc-ic.com
标志 UTC - Unisonic Technologies

L3012L-S08-R 数据表(HTML) 4 Page - Unisonic Technologies

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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
The output current is determined by the sampling resistor (RS) and setting voltage (VIN-VSENSE a built-in fixed
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.
The average current through the diode is ID:
ID= (1-D)·ILED
ILED is the current of LED
TYPICAL APPLICATION CIRCUIT
1
2
3
4
8
7
6
5
SW
GND
SENSE
VIN
ADJ
VDD
PWM
COMP
SBD
VIN
Rs
Cout
L
10µF
1µF
100nF



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