AN3256 datasheet(1/23 Pages) STMICROELECTRONICS

Part #	AN3256

Description	Low-cost LED driver for an A19 lamp

PDF	23 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 23 page

September 2010

Doc ID 17790 Rev 1

1/23

AN3256

Application note

Low-cost LED driver for an A19 lamp

Introduction

This application note describes a prototype of a non-dimmable, non-isolated LED driver.

The physical design is small enough to fit in the base of an A19 (screw bases 40 to 60 W

equivalent) bulb outline. The coupled inductor has a stepdown winding to power the L6562A

PFC driver.

The design goals:

■ Input: 96-132VAC, 60 Hz, non-dimmable, TRIAC dimmer safe (no damage)

■ Output: 370 mA into strings of 5 to 12 LEDs

■ Topology: stepdown (buck) switching regulator

■ Features: regulation of LED current, power factor acceptable for US market for residential

use, excellent efficiency

ST devices:

■ PFC controller: L6562A

■ Switching FET: STD5NM50

■ Flywheel diode: STTH1R04

Figure 1.

Physical envelope

Figure 2.

Image

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