AN4213 datasheet(5/42 Pages) STMICROELECTRONICS

Part #	AN4213

Description	Fluorescent lamps are increasingly driven by electronic

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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DocID023984 Rev 2

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AN4213

System description

Figure 2. Block diagram

The electronic ballast consists of two sections: a power factor correction pre-regulator

(PFC), using the L6562A, and the lamp ballast stage with the L6569.

The power factor correction section is based on the L6562A. This is a current-mode PFC

controller operating in transition mode (TM). It is especially designed for electronic lamp

ballast applications (to better understand the L6562A characteristics, refer to AN2761).

The lamp ballast stage is based on the L6569 which is a high-voltage half-bridge driver with

a built-in oscillator. The load consists of an L-C series resonant circuit with the lamps

connected across the capacitors. This topology allows operating in zero-voltage switching,

to reduce the transistor switching losses and the electromagnetic interference generated by

the output wiring of the lamp.

AM17316v1

Cin

PFC

Converter

DC/AC

400Vdc

AN4213 Datasheet(PDF) 5 Page - STMicroelectronics