ACT111A
Rev 0, 14-Feb-11
4.8V to 30V Input, 1.5A LED Driver with Dimming Control
FEATURES
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Up to 92% Efficiency
Wide 4.8V to 30V Input Voltage Range
100mV Low Feedback Voltage
1.5A High Output Capacity
PWM Dimming
10kHz Maximum Dimming Frequency
Thermal Shutdown
SOT23-6 Package
GENERAL DESCRIPTION
The ACT111A is a high efficient LED driver
employing current-mode buck converter topology
that supplies up to 1.5A from wide input voltage
range from 4.8V up to 30V. The ACT111A is
designed to operate as a constant source with
1.4MHz fixed frequency. ACT111A consists of a
PWM control circuit, a high precision band-gap
voltage reference, an oscillator, an error amplifier
with internal compensation network and the N
channel power MOSFET. An external sense
resistor in series with the LED monitors output
current allowing accurate current regulation, ideal
for driving high current LEDs. The built-in fault
condition protection circuits including current
limiting, UVLO and thermal shutdown prevent itself
from potentially faulty operation and burn-out.
The ACT111A is ideal for single 1W to 5W LED
drivers. With its ultra low feedback voltage, a low
current ripple, high efficiency of up to 92% step-
down power LED driver can be easily composed of
with additional several external components such
as an inductor, a Schottky diode, a few resistors
and capacitors.
APPLICATIONS
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High Brightness LED Driver
Architecture Detail Lighting
Constant Current Source
Hand-held Lighting
Automotive RCL, DRL, and Fog Lights
Indicators and Emergency Lighting
MR16 and other LED Bulb
TYPICAL APPLICATION CIRCUIT
Innovative Power
TM
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