1

Introduction

2

Description

2.1

Typical Applications

2.2

Features

User's Guide

SLUU355A – March 2009 – Revised June 2009

A 0.9-A Constant Current Supply with PFC for 100-W LED

Lighting Applications

The UCC28810EVM-002 is a constant current non-isolated power supply for LED lighting applications. It

will convert universal mains (90 VRMS to 264 VRMS) to a 0.9-A constant current into a 100-W load. This

evaluation module will allow the customer evaluate the UCC28810/11 in a typical LED lighting application.

The evaluation module uses a two stage approach to controlling the output current.

The first stage is a transition mode PFC circuit. This ensures the design meets the harmonic current or

power factor requirements set out by various standards, such as EN61000-3-2. The PFC circuit converts

the AC input to a regulated DC voltage. This DC voltage can be configured in one of two ways. The

default configuration of the module is that of a boost follower type PFC. The boost follower PFC is where

the PFC regulated output DC voltage tracks the AC input peak voltage. The second configuration requires

removing some components and changing a resistor value see below for more details. This second

configuration removes the tracking element of the PFC circuit. The PFC DC output voltage will then be

regulated to a fixed value in the region of 396 VDC.

The second stage also uses transition mode but is configured as a buck converter. It converts the PFC

output voltage to a fixed constant current. This circuit is capable of supplying 0.9 A into a 100-W load. It

also accepts PWM dimming inputs. Alternatively the user can use the PWM circuit on the module to see

the dimming function.

This module will work with most high brightness LED’s (HB-LED) that operate with 0.9 A and a total string

voltage drop of between 55 V and 110 V.

• AC Input General Lighting Applications Using HB-LED’s

• Industrial, Commercial and Residential Lighting Fixtures

• Outdoor Lighting: Street, Roadway, Parking, Construction and Ornamental LED Lighting Fixtures

• 90 VRMS to 264 VRMS operation

• Boost Follower or Fixed Output PFC Stage

• PFC Disable

• Output Current Disable

• External or Internal PWM Dimming

A 0.9-A Constant Current Supply with PFC for 100-W LED Lighting Applications

2

SLUU355A – March 2009 – Revised June 2009

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