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Old 20th March 2006, 03:33 PM   #11
testlab is offline testlab  United States
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Watch the pinout on these guys! Sometimes they are not the same as the National part. You probably have a pinout error.
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Old 20th March 2006, 03:46 PM   #12
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The pin outs were the same, but the device didn't begin to regulate until the load was drawing about 3ma.
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Old 28th March 2006, 06:35 AM   #13
clem_o is offline clem_o  Philippines
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Quote:
Originally posted by LHMAudio
I read through the ST Micro data sheet a number of times looking for an indication of the minimum required current draw and didn't see anything.

Hi, see encircled portion, from the ST datasheet for the 7915AC (p5)... 5mA is the minimum load. Load Regulation spec says the same thing... Hope this helps...

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Old 28th March 2006, 07:02 AM   #14
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Default 7915 regulator

The maximum input voltage for this chip is -30V, so it is entitled to misbehave. The fact that it seems to work for a brief period while the main reservoir caps discharge is compatible with this interpretation. Try connecting a large zener diode, capable of carrying enough current in series with the inoput to the regulator, and also add small (0.1u) caps to input and output, as already suggested.
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Old 28th March 2006, 03:47 PM   #15
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The specific regulator I used was the ST Microelectronics L7915ACV which has a maximum input voltage of -35VDC. The data sheet can be found here:

http://www.st.com/stonline/books/pdf/docs/2150.pdf

Thanks for the info on how to find the minimum current required for regulation. I have completed the circuit and it has been working correctly.

Thanks to everyone for you help. I love this forum.

Lindsay
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