Electronics > Projects, Designs, and Technical Stuff
Dual channel 0-15V 0-500mA power supply
exe:
Only you can decide if this is a problem or not :). Also, I don't know how it was measured. May be it can become worse under different condition. Like, a capacitive or inductive load may make it worse.
I'd say the whole point of a linear *bench* psu is to have a clean and stable output. I treat it as i a piece of test gear that I can trust. So, if I, say, troubleshoot an amplifier, and I see an oscillating output, I want to be sure it's not because of oscillation injected from a power rail. So, yes, I'd call this a problem. And it seems to be easy to fix.
xavier60:
Try increasing C5 to something like 100pF.
kallek:
Thank you exe and xavier60. I will try to put 100pf cap parallel with c5 and lets see what happen! :-+
kallek:
I tested 22pf and 100pf parallel C5 and no effects at all. Problem seems to be only in CC-mode. that picture with 5mV oscillation was taken output shorted. Now I connected 1 ohm resistor and adjusted voltage so that current was just below 500mA. Results:
xavier60:
Try adding a compensating capacitor to the CC op-amp.
On second thoughts, a compensating capacitor won't do much unless there is a 10K resistor in series with pin 6
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