This document describes the design of a dimmable white LED power supply using VIPer53. VIPer53 is the first multichip device of the VIPer family, with very low Rdson, capable of delivering a power of 35W in a standard DIP-8 package without a heatsink. The power supply features a wide output voltage range and dimming capability.
The document details an off-line fly-back power supply topology designed to drive single-chip white LEDs. The design utilizes the VIPer53 multichip device as a current generator with Pulse Width Modulation (PWM) capabilities to ensure dimmability and efficiency across a wide input voltage range.
The power topology works at a fixed frequency of 66KHz.
The device can deliver a typical output current up to 1000 mA.
The application supports an input voltage range from 82 to 265 V AC.