BL8545 Datasheet - BELLING

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

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

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

Applications

* Compact Back Light Module
* Power Source for LED
* Constant Current Source BL8545 is available in SOT23-6 package that is PB free. TYPICAL APPLICATION L1 VIN 10uH D1 SS14 LED1 Cin 4.7uF ON OFF VIN LX OVP BLCL83534050 CE FB GND Cout 4.7uF LED2 LED3 LED4 R1 Figure1.

BL8545-BELLING.pdf