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AN880

更新时间： 2022-06-02 21:30:19

品牌	Logo	应用领域
松下 - PANASONIC		高压电子驱动
页数	文件大小	规格书
14页	192K
描述
THE L6569 A NEW HIGH VOLTAGE IC DRIVER FOR ELECTRONIC LAMP BALLAST

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AN880 数据手册

AN880

APPLICATION NOTE

THE L6569: A NEW HIGH VOLTAGE IC DRIVER FOR

ELECTRONIC LAMP BALLAST

by G. Calabrese and T. Castagnet

Figure 1: CFL series resonant half bridge inverter.

INTRODUCTION

Electronic lamp ballasts are now popular in both

consumer and industrial lighting. They offer power

saving, flicker free operation and reduced sizes.

Improvements to the light control and cost reduc-

tion of the ballast will broaden their market accep-

tance.

Today designers focus on reducing the cost of the

ballast, but also work to add features to the bal-

last like saving energy by dimming the light, or in-

creasing the life time with better preheat and pro-

tections. Such requirements have contributed to

the development of dedicated high voltage con-

trollers like the L6569, which are able to drive the

floating transistor of a symmetric half bridge in-

verter. This device is a simple, monolithic oscilla-

tor-half bridge driver that allows quick design of

the ballast.

Figure 2: Current and voltage of the STD3NA50

MOSFETs when driven in ZVS with

the L6569.

HIGH VOLTAGE IC DRIVERS IN BALLAST AP-

PLICATIONS

The voltage fed half bridge

I_D

V_DS

Voltage fed series resonant half bridge inverters

are currently used for Compact Fluorescent Lamp

ballasts (CFL), for Halogen Lamp transformers,

and for many European Tube Lamp (TL) ballasts.

This simple converter is preferred for new de-

signs, because it minimizes the off state voltage

of the power transistors to the peak line voltage,

and requires only one resonant choke. In addition

this choke protects the half bridge against short

circuits across lamp terminals. However overheat-

ing and overcurrent occur during open load op-

eration. The inverter robustness must be im-

proved, or some protections are required.

GND

LVG

GND

2 µs/dv ; 50 V/dv ; 0.1 A/dv

gle frequency with a saturable pulse transformer

(see fig. 1) to drive the transistors. This type of

design has a higher component count, a higher

tolerance on the switching frequency, and it can-

not adjust the lamp power.

The only way to design a cost effective, compact

and smart control of the lamp is to use a dedi-

cated I.C. that is able to drive the upper transistor

of an symmetric half bridge inverter. Such control-

lers require a high voltage capability for the float-

ing transistor driver [2]. MOSFETs are preferred

over Bipolar transistors as power switches be-

cause their gate driver requires a lower supply

current and a smaller silicon size [3].

The half bridge inverter operates in Zero Voltage

Switching (ZVS) resonant mode [1], to reduce the

transistor switching losses and the electromag-

netic interference generated by the output wiring

and the lamp.

Fully integrated ballast controllers

By varying the switching frequency, the half

bridge inverter is able to modulate the lamp

power. However most current designs use a sin-

1/14

February 2003

12 3 4 5 6 7...14

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