Electronics > Projects, Designs, and Technical Stuff
Bench CC/CV PSU Based on Daves uSupply (Not Anymore)
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not1xor1:

--- Quote from: imo on March 15, 2019, 10:56:17 am ---I've been playing with both versions a bit. Added FastCC (see a different Mike_Mike's PSU thread on that).
As an example here is the response to a "short" (from 20V) for jaycee's and not1xor1's version with identical params in compensation, parts, settings and load, LT1022A used.
Measured at the 0.33ohm 3055 emitter resistor (FastCC).

Added V(out) dropping from 20V.

Added "shorting" into 10mH, measured at the Shunt resistor.

--- End quote ---

you should also take into account things like ripple rejection (e.g. feed it with something like PULSE(35 38 0 3m 7m 0 10m)), short recovery (voltage overshot), etc...
iMo:
This is not1xor1, 20V out, with current limit set to 3A, playing Jeremiah Clarke's "Trumpet Voluntary - Prince of Denmark's March" as the I_Load..  :D

Added: Vinput=25V modulated by Trumpet, Vout=15V, Rload=15ohm (1A Iload), current limit=2A.
PS: 94dB ripple rejection?
iMo:
Here is with jaycee version, the same setup- Vinput=25V, Vout=15V, Rload=15ohm, Ilimit=2A, Trumpet modulated Vinput.

NOTE: in both cases the modulation is applied to the power rail only. The opamps are powered from a clean 25V and -5V.
Kleinstein:
Who needs the TRUMPet ?  It may look funny, but gives essentially no information about the regulator.

For a good test one should have a Spice current "source" as the load and do some transients, like 1 A - 10 mA - 1 A with a short rise / fall (e.g. 100 ns).

Looking at the AC analysis, with the current sink in AC mode (with some DC offset) is also a good way to analyze a regulator. The AC output voltage than directly represents the output impedance. This output impedance should not show more than 90 degreee phase shift.
This is a nice mode to adjust the compensation.
iMo:
@Kleinstein: it was done already, see above.
If you have some typical load test pattern, you may give us the model.
I've done the Trumpet load/modulation for fun and to see how it is with the ripple rejection as well :D

PS: finally, the jaycee version with the common +25V power rail and V+ of the opamps (LT1022A) modulated by Trumpet.
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