Diodes – AL9902 – Universal High Voltage Buck LED Driver
The AL9902 has an internal MOSFET that allows switching frequencies up to 300kHz, with the switching frequency determined by an external single resistor. The AL9902 Buck topology creates a constant current through the LEDs providing constant light output. The output current is programmed by one external resistor.
The LED brightness can be varied by both Linear and PWM dimming using the AL9902’s LD and PWM_D pins respectively. The PWM input operates with duty cycle of 0-100% and frequency of up to several kHz.
AL9902 is available in SO-16 and the thermally enhanced DFN6040-12 packages.
The Diodes’ Advantage
The AL9902 Provides a Simple Bill Of Materials (BOM) Solution for Universal Input Voltage Applications.
High Voltage MOSFET
Up to 650V, 2A
Internal High Voltage Regulator Removes Start-Up Resistor
7.5V regulated output, can supply external circuitry
LED Brightness Control through Linear and PWM Dimming
LD pin and PWM_D pin operate from 0 -100% Dimming
Applicatons
- LED Offline lamps
- High voltage DC-DC LED Driver
- Signage and decorative LED lighting
- Back lighting of flat panel displays
- General purpose constant current source
