Electronics > Beginners
5V regulator outputting 5.9V and more.
Simon:
I made a small board with a µC and a 5V regulator. On power up i was surprised to find that it outputs 5.9V. I thought maybe it does not have enough load so i put a 510 ohm resistor on its output as the datasheet says that all the specs given are at 10mA. But now it outputs 6.1V.
is it a dodgy part? did I overheat it on re-flow? It's a LM2931ADT-5.0RKG
Wimberleytech:
--- Quote from: Simon on December 08, 2019, 04:21:18 pm ---I made a small board with a µC and a 5V regulator. On power up i was surprised to find that it outputs 5.9V. I thought maybe it does not have enough load so i put a 510 ohm resistor on its output as the datasheet says that all the specs given are at 10mA. But now it outputs 6.1V.
is it a dodgy part? did I overheat it on re-flow? It's a LM2931ADT-5.0RKG
--- End quote ---
Measure the voltage on all three pins (right at the pins of the regulator). Let us know what you read.
Simon:
that is the voltage on the regulator pin. There is a 330nF capacitor either side as close as practical.
andy3055:
Can you post the schematic you used?
Wimberleytech:
--- Quote from: Simon on December 08, 2019, 05:03:40 pm ---that is the voltage on the regulator pin. There is a 330nF capacitor either side as close as practical.
--- End quote ---
I would like to know that pin 2 (the ground pin) is actually zero volts.
You should also look at the pins with an oscilloscope to be sure that there are no oscillations.
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