Other Parts Discussed in Thread: LM5013
Hi, I use a LM5013-Q1 on a power board with nominal input voltage +28V and nominal output is set to +12.5V / 3.5A.
In reality the output voltage is more like +12.8V but is rather sensitive to changes in input voltage. Our problems were discovered when tested in a climate chamber
in -40 degrees centigrade (which is what it should manage) together with an output load of approx. 2 - 2.5 amps. Then the output voltage dipped, like down spikes all the way down to around +7V !
This causes our CPU board which is fed by the LM5013 to reboot.
After that we tested only the power board alone, connected to a 200W power resistor to set an output current of 2.2A.
Then we sprayed "freeze spray" on the board to locate the problem. when spraying the regulator the output voltage dipped immediately to 7 - 8V. It was very sensitive!
You can see the power board schematics above. Parts to the left of the regulator is mainly to minimize EMC and make the board +100V tolerant.
Anyone else who experienced these problems? Any ideas of what's going on, or what to do to solve our problems??
B.R.
Leif Svensson