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Old 5th March 2005, 10:56 PM   #1
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Default Maximum voltage for LM4780

What is the maxium ps output voltage anyone has so far tried with the LM4780. I have a 35-0-35 transformer on hand, but I don't know if that 's too much. Any thoughts?
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Old 5th March 2005, 11:12 PM   #2
DonoMan is offline DonoMan  United States
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You can use it if you have really good heatsinks
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Old 6th March 2005, 03:23 AM   #3
Tweeker is offline Tweeker  United States
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LM4780 has an absolute limit of +/-42 volts at the rails, or so sayeth the data sheet.
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Old 6th March 2005, 03:24 AM   #4
DonoMan is offline DonoMan  United States
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damn, I'm good at confusing lm4780 for other chips I've seen, lol
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Old 6th March 2005, 07:45 AM   #5
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Default Heat sink supplier?

I have some small ones I salvaged out of an old amp. Where would one go on the Net to order some big ones?

Thanks in advance.
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Old 6th March 2005, 10:06 AM   #6
DonoMan is offline DonoMan  United States
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It would be +/- 47V max if you have an input (so if you ground the input through a resistor, it may be ok) so says the data sheet, actually (I hadn't realized before that it was for both rails heh) and if your transformer is 35-0-35 then you'd have 49.5V after DC conversion. Options:

1) Try it anyway (bad idea but might be ok with a really big heatsink)
2) Regulate the power supply down to ~40V for voltage (best idea IMO, as regulating has other advantages as well)
3) Modify the transformer
4) Get a new transformer
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