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Old 05-16-2019, 01:49 PM   #30
Badcaps Veteran
Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 1,743
Default Re: DPS5020 dual power supply build

My worry is not damaging the DPS module due to the output on/off mosfets. What is weird about the modules is the low-side ground switch they have.

Stray capacitance on the power transformer means things can float with noise and hum, so I suggest adding a 10nF and 1MEG to give leakage currents a path to earth ground. If things floated say to 50V it would damage the DPS mosfet when the PSU output was switched off. Output switched off -> (-) floats

The DPS5020 has a couple fuses on the PCB. I don't think you need an input fuse - it has F3 on the pcb. F1 I think is for the MCU and display.

This is the circuit I might try.
Attached Images
File Type: png DPS5020_power_supply_001.PNG (68.4 KB, 27 views)
File Type: jpg dps5020-adjustable-power-supply-50-v-20-b.jpg (257.6 KB, 14 views)
File Type: jpg dps5020-adjustable-power-supply-50-v-20-a.jpg (187.1 KB, 9 views)
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