AF1800A Datasheet | Alfa-MOS

Alfa-MOS Technology 600V, 1A, 300KHZ PWM Universal High Brightness LED Driver General Description The AF1800A is a peak current PWM high efficiency HBLED driver control IC. It allows HBLEDs from voltage sources ranging from 10VDC up to 600VDC. The AF1800A controls an external MOSFET at fixed switching frequency up to 300k Hz. The frequency can be programmed using a single resistor. The LED string is driven at constant current rather than constant voltage, thus providing constant light output and enhanced reliability. The output current can be programmed between a few milliamps and up to more than 1.0A. AF1800A uses a rugged high voltage junction isolated process that can withstand an input voltage surge of up to 600V. Output current to an LED string can be programmed to any value between zero and its maximum value by applying an external control voltage at the linear dimming control input of the AF1800A. The AF1800A provides a low-frequency PWM dimming input that can accept external control signal with a duty ratio of 0~100% and a frequency of up to few kilohertz. Features 10V to 600V input range > 90% efficiency Constant current LED driver Applications from a few m A to more than 1.0A output LED string from one to hundreds of diodes PWM low frequency dimming via PWMD pin Input voltage surge ratings up to 600V SOP-8 and DIP-8 package Application DC-DC or AC-DC LED driver applications RGB backlighting LED driver Back lighting of flat panel displays General purpose constant current source Signage and decorative LED lighting Automotive Chargers Pin Define SOP-8 Marking Information SOP-8 ©Alfa-MOS Technology Corp. Rev.A Apr. 2012 .alfa-mos. Page 1 Alfa-MOS Technology 600V, 1A, 300KHZ PWM Universal High Brightness LED Driver Typical Application Circuit Pin Description Pin 1 2 3 4 5 Symbol VIN CS GND GATE PWMD ROSC Description Input voltage 10V to 600V DC Sense LED string current Device ground Drive the gate of the...