STMicroelectronics AN2640 Intelligent Multipower Digital Ballast Application Note

This is a multi-power digital electronic ballast for T5 fluorescent lamps, controlled by ST7FLIT19B and L6382D5

Brand: STMicroelectronics
Category: Other Electronics
Document type: Application Note
Language: English
Pages: 36
File format: PDF
File size: 1.8 MB
Published: 06 August, 2012
Updated: 30 September, 2023
Model: AN2640
MD5 checksum: 5074D776E6296330D1EDAD2451642C13
PDF: STMicroelectronics AN2640 Intelligent Multipower Digital Ballast Application Note PDF

About this manual

This application note describes an electronic ballast designed for the T5 fluorescent lamp family, supporting 24 W, 39 W, 54 W, and 80 W lamps. The system utilizes an ST7FLIT19B 8-bit microcontroller to manage lamp recognition and control a boost converter (PFC) and a half-bridge inverter. The design ensures zero voltage switching and efficient power factor correction.

What's inside

PFC section design criteria
Half-bridge design criteria
ST7LITI9BF1 - 8-bit MCU
L6382D5 - power management units
Recognition technique
Board description
Experimental results

Specifications

Supported Lamp Powers	24 W, 39 W, 54 W, 80 W
Output Voltage	420 V
Boost Inductance	2 mH + 5%
Startup Capacitor	10 nF
Power Switch	STP6NK60Z
Rectifier	STTH1L06

Frequently asked questions

Which fluorescent lamps can this ballast drive?

The ballast is able to recognize and drive lamps within the T5 fluorescent family, specifically 24 W, 39 W, 54 W, and 80 W models.

What is the regulated DC output voltage?

The system regulates the DC output voltage to 420 V.

What is the maximum lamp power used for inductance calculation?

The inductance calculation must be performed using the maximum lamp power of 85 W.

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