Author Topic: 3PRR Voltage Regulator Orientation  (Read 209 times)

Gristlepig

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3PRR Voltage Regulator Orientation
« on: February 22, 2018, 07:16:50 PM »
Hey guys,
This feels like a dumb question, but Iíve never worked with voltage regulators before and I am unsure subbing the vr on the 3PRR board.
I do not have access to the recommended LM78L15 in the TO-92 package, so Iím assuming I can use one of these big, honkiní TO-220 L7815CV in itís place. At least thatís what I gather from the datasheets. Am I correct?
Now comes the dumb question...
Does this voltage regulator put off heat under normal use?
In order to get it to fit, I had to bend the pins 45 degrees and lay it down touching the 10uf electrolytics. And well... I donít wanna cook up some capacitors.

So yeah... I super appreciate yíalls help.

madbean

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Re: 3PRR Voltage Regulator Orientation
« Reply #1 on: February 22, 2018, 08:27:42 PM »
It will put out some heat, but probably not enough to damage the cap next to it.  Most of the heat will get absorbed and emitted by the heat sink which is on the other side. Your pin orientation is correct.
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Gristlepig

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Re: 3PRR Voltage Regulator Orientation
« Reply #2 on: February 22, 2018, 08:49:02 PM »
Super rad.

Thanks Brian!

alanp

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Re: 3PRR Voltage Regulator Orientation
« Reply #3 on: February 23, 2018, 12:42:21 AM »
If the 'L' package regulator is enough, then the big regulator won't be worried in the slightest.

If I'm reading the datasheet rightly, the tab is linked to Ground, so if you're really worried, you could just have the regulator high enough that the tab is pushed against the enclosure, and use that as a heatsink.
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