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BL8545 - High Efficiency Low Noise PFM Step-up DC/DC Converter

Description

The BL8545 PFM step-up Converter drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other handheld devices.

Features

  • allowing series connection of the white LEDs so that the LED currents are identical for uniform brightness. An enable input can be pulsed repeatedly to adjust LEDs brightness. The fast 500KHz to 2MHz operation frequency allows for smaller capacitor and inductor. Fault condition protection uses cycle-by cycle current limiting to sense maximum inductor current and over-voltage protection. The 0.2V low reference voltage minimized the power loss across the current sense resistor. The converter can o.

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Datasheet preview – BL8545

Datasheet Details

Part number BL8545
Manufacturer BELLING
File Size 66.80 KB
Description High Efficiency Low Noise PFM Step-up DC/DC Converter
Datasheet download datasheet BL8545 Datasheet
Additional preview pages of the BL8545 datasheet.

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Full PDF Text Transcription

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BL8545 REV1.0-Revised SEP 2008 High Efficiency Low Noise PFM Step-up DC/DC Converter DESCRIPTION The BL8545 PFM step-up Converter drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other handheld devices. It features allowing series connection of the white LEDs so that the LED currents are identical for uniform brightness. An enable input can be pulsed repeatedly to adjust LEDs brightness. The fast 500KHz to 2MHz operation frequency allows for smaller capacitor and inductor. Fault condition protection uses cycle-by cycle current limiting to sense maximum inductor current and over-voltage protection. The 0.2V low reference voltage minimized the power loss across the current sense resistor.
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