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post #63 of (permalink) Old 11-19-2011, 06:08 PM Thread Starter
Planted Tank Guru
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Join Date: Jun 2004
Location: Baton Rouge, LA
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Interesting. More complex than I expected.

A PFC IC, like the TDA4862 or similar, was expected.

The 2842 isn't the bandpass filter you linked. It's almost certainly a current-mode PWM controller. This is a common chip in various power supplies. A bit surprising to see it as the heart of this ballast, instead of a more specialized IC.

The IR2111 is a half-bridge driver, which would be needed to interface a 2842 to the output MOSFETs.

And finally, eight op-amps in the 2x LM224's. The remaining unidentified chips may just play minor roles.

Thanks for the info. I was curious.
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