| hongrn |
Hi Guys,
Just got my Avel Lindberg 330VA 25V+25V toroid in. Well, the secondaries are not exactly 25V, about 26 something. I hooked them up to the rectifier boards and got almost 38VDC. The LM4780 datasheet specifies 35VDC. Am I going to fry my chip with the extra 3 volts? Thanks.
Hong
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| Nordic |
| Lol if it was an old transformer, I would tell you to remove some windings till you got to a safer voltage.... |
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| motherone |
| The transformer is probably spec'd at 25VAC under load. Since you have no load on it right now, it's probably going a few volts over. Under load, you should have ~35VDC. |
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| Tweeker |
| Absolute max supply voltage is listed at +/- 42 volts, with 10% overvoltage your still under it. Your rails are high due to the no load condition. |
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| hongrn |
Thanks everyone. I feel better now. Better ask a stupid question than be sorry.
Hong |
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