STMicroelectronics AN3973 Application Note Electronic Ballast with Active PFC

This document describes the application of an electronic ballast using STD3N62K3 power MOSFET and STD845DN40 BJT devices. The electronic ballast features active power factor correction (PFC), optimized THD harmonic distortion, and electric efficiency.

Brand: STMicroelectronics
Document type: Application Note
Language: English
Pages: 24
File format: PDF
File size: 3.3 MB
Published: 06 August, 2012
Updated: 29 September, 2023
MD5 checksum: 6426DB9574A0C71B2F810539B6BF7BDA
PDF: STMicroelectronics AN3973 Application Note Electronic Ballast with Active PFC PDF

About this manual

The document presents an electronic ballast project designed as a demonstration board for a 2x28 W lamp. The system utilizes a self-oscillating half bridge converter combined with a PFC section to optimize power factor, total harmonic distortion (THD), and electric efficiency. It is designed for a nominal input voltage of 230 Vrms+15% at 50-60 Hz.

What's inside

System description
Power factor section design
Input capacitor selection
Output capacitor selection
Boost inductor calculation
Power MOSFET selection
L6562A biasing circuitry
DC-AC converter phases
Driving optimization
Experimental results

Specifications

Nominal output power	60 W
Target efficiency	~ 90%
Minimum switching frequency	35 kHz
Expected power factor	0.99
Nominal output voltage	400 V

Frequently asked questions

What are the key components used in this ballast design?

The design uses a power bipolar transistor (STD845DN40), a MOSFET device (STD3N62K3), and an ST power switching driver.

What is the nominal input voltage range?

The circuit is designed for a nominal input voltage of 230 Vrms+15% at 50-60 Hz.

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