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Electronic Ballast (L6569)

2017-07-12 10:25  
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This article describes the Electronic Ballast (L6569). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:L6569.

This is a electronic ballast circuit using L6569. This circuit uses The L6569 because it can control a low voltage halogen lamp transformer or a symmetric half bridge inverter of a fluorescent lamp ballast directly. The prevention of cross conduction is done by Two 270mA buffers drive the inverter MOSFETs with a 1.25ms built-in dead time. This circuit need only 150 mA at power up. Here is the circuit:

L6569 Electronic Ballast circuit schematic

This circuit use BCD off line technology to drive The buffer of the upper Mosfet through a 600V level shifter. An oscillator and an internal 15V shunt regulator are used in this circuit. The internal regulator has a 9V Under Voltage Lock Out with an 1V hysteresis. And the frequency of the oscillator is from 25 to 150 kHz with a /-5% maximum tolerance. [

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