Products > Test Equipment
DP100 PD-Power Supply 100Watt [0-30.00V / 0-5.000A) [∼50$]
Dexter2:
I was thinking the same to make a small piggyback PCB that would connect to the Fuse terminals and use the control signal for the low side MOSFET to control an high side P-Channel MOSFET on positive terminal. There are no connections after the fuse as far i have seen. But this solution would need as you mentioned level shifting and a negative voltage generator to proper open the P-Channel MOSFET also when the output voltage is set below a few V. Not a problem to make but there is not a lot of space available for the piggy-back... Will see if i find a integrated solution that would be small enough to fit. If i find something appropriate i will share my findings.
As for the current regulation, yes it's slow no way to connect a LED with output ON without a bang :) But this is true for most switching power supplies that do not have linear post regulation. For this price i thing its an OK tradeoff... It was a better choice to make it low noise but slow than to make it fast and noisy. But probably they could have reduced the output capacitance to at least half with same noise performance by using an LC filter on output and not only capacitors as now...
Dexter2:
First idea... Will see if it fits...
Hydron:
Something like this could simplify the circuit (only needs a couple of 100n caps and N-ch MOSFET), though it would need 5V for Vcc rather than 3V3:
https://www.analog.com/media/en/technical-documentation/data-sheets/ltc7004.pdf
Is the USB-A port on the unit always on? That could provide a 5V supply.
There may of course be other better options out there (something that's easier to dead-bug than a 10 pin MSOP and runs on 3V3 would be nice).
Dexter2:
Nice chip this LTC7004. Wil investigate if there is an internal 5V rail that is always on...
Update: Internally there is a 5V rail that is always present.
DaneLaw:
You can also control it from a browser fx Chrome.
As it supports WebHID
Video below
Works from a browser link, no program installment.. its from the same fellow that made the open-source input device "Smartknob" with millions of views, that went viral some time back.
He seems to be quite fond of his DP100 purchase.. impressive value for the price.
Open source SmartKnob..
WebHID DP100
Works like a charm.. no programs needed.. just open this link and connect.
https://scottbez1.github.io/webdp100/
Relevant github
GitHub: https://github.com/scottbez1/webdp100
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