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A8431

Allegro MicroSystems
Part Number A8431
Manufacturer Allegro MicroSystems
Description White LED Driver Constant Current Step-up Converter
Published Mar 14, 2007
Detailed Description www.DataSheet4U.com Preliminary Data Sheet Subject to Change without Notice April 5, 2005 A8431 The A8431 is a noninve...
Datasheet PDF File A8431 PDF File

A8431
A8431

Overview
www.
DataSheet4U.
com Preliminary Data Sheet Subject to Change without Notice April 5, 2005 A8431 The A8431 is a noninverting boost dc-dc converter that provides a programmable constant current output up to 32 V for driving white LEDs in series.
The A8431 also offers an OVP (overvoltage protection) pin.
Driving the LEDs in series ensures identical currents and uniform brightness.
Up to four white LEDs can be driven at 20 mA from a single cell Li-ion or a multicell NiMH power source.
Up to two parallel strings of eight white LEDs can be driven at 20 mA by increasing the supply voltage up to 10 V.
The A8431 incorporates a power switch and a feedback sense amplifier to provide a solution with minimum external components.
The output current can be set by adjusting a single external sense resistor and can be varied with a voltage or a filtered PWM signal when dimming control is required.
The high switching frequency of 1.
2 MHz allows the use of small inductor and capacitor values.
The A8431 ...


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