Product category:
Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A8430
Edited by the Electronicstalk Editorial
Team on 05 October 2004
Boost convertor drives up to seven white
LEDs
The A8430 is a noninverting high-frequency boost convertor that provides a programmable constant-current output at up to 36V from a 2.5-10V input for driving white LEDs in series.
The A8430 is a noninverting high-frequency boost convertor IC that steps up the input voltage to provide a programmable constant-current output at up to 36V from a 2.5-10V input for driving white LEDs in series Driving LEDs in series ensures identical currents and uniform brightness
This article was originally published on Electronicstalk on 30 Aug 2000 at 8.00am (UK)
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With the A8430, up to four white LEDs can be driven from a single cell Li-ion or a multicell NiMH power source.
Up to seven white LEDs can be driven by increasing the supply voltage to 10V.
The A8430 is supplied in an ultrathin 3 x 3mm five-lead QFN package measuring only 0.75mm high, and uses an industry-standard pinout and equivalent SOT-23-5 footprint - making it an easy drop-in replacement for competing products.
Typical applications include LED backlighting in portable battery-operated equipment such as mobile telephones, PDAs, video recorders, digital cameras, personal stereos, MP3 players and mobile GPS systems.
The A8430 incorporates a power switch and feedback sense amplifier to minimise the requirement for external components.
The output current can be set by adjusting a single external sense resistor, and can be varied with a voltage or 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.
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