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New Siglent SPD4000X series power supply

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mawyatt:

--- Quote from: 2N3055 on October 07, 2024, 01:08:34 pm ---As to good practice, you would set voltage to some low value and set 20mA.
Connect DUT, enable output and slowly ramp up the voltage...

--- End quote ---

Good advice with any unknown DUT situation :-+

With known DUT and developmental work (what we mostly do/did) we almost always set the Overcurrent (CC) Limit to slightly above normal (expected) current draw and the Voltage (CV) to the desired operating voltage. We've been "saved" by this procedure more times than we care to admit :o

Best

ArdWar:

--- Quote from: mhsprang on October 07, 2024, 12:49:43 pm ---Why isn't that a normal mode of operation?

--- End quote ---
I should've word it better, what I meant is that direct into CC is not exactly commonly used feature. And the problem mentioned above is not "normally" appliable to the use case presented in the posted question.
Yes I agree that proper CV AND CC is expected (and should be guaranteed) mode of operation, but CV is by far the more common usage and is the one that applies to the posted question, and so far no decent PSU fails so bad that it violate CV setpoint.

To put it simply, the particular problem discussed here is not where you set your PSU at 3.3V and it somehow overshoot to 8.0V. It is where you set 10mA and it somehow go all the way to 160mA.

Furna:

--- Quote from: mawyatt on October 07, 2024, 01:17:22 pm ---Overshoot Voltage can and will damage/destroy certain components ...

--- End quote ---

Execess of current due to the Overshoot Volatge can and will damage/destory certain components ...
 :)

mawyatt:

--- Quote from: Furna on October 07, 2024, 04:41:38 pm ---
--- Quote from: mawyatt on October 07, 2024, 01:17:22 pm ---Overshoot Voltage can and will damage/destroy certain components ...

--- End quote ---

Execess of current due to the overvolatge can and will damage/destory certain components ...
 :)

--- End quote ---

Actually the overvoltage can without much current at all. CMOS Gate Oxides fail due to voltage, they are so thin today, a few atoms thick, that it doesn't take much voltage (or current) to puncture the oxide and cause a failure, and in it takes very very little current for this puncture to happen :P

BTW BJTs are also susceptible, altho they tend to take more current as the usual failure mode is localized heating. A couple decades ago we were dealing with 400~500GHz SiGe BJTs in a BiCMOS process that had junction breakdowns below 2V, you could fry these by just looking at them it seemed....exteremely sensitive to any over voltage.

Of course as always YMMV!!

Best

Best

seajayshore:
Looking forward to a video review on these! They look great on paper!  :popcorn:

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