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Lab Power Supply Turn ON and OFF Characteristics

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AVGresponding:
This appears to show the SPS5042X not going in to CC..?   :-//

tautech:

--- Quote from: AVGresponding on October 14, 2024, 05:21:51 am ---This appears to show the SPS5042X not going in to CC..?   :-//

--- End quote ---
;D
Study the V/div settings.  ;)

Kean:

--- Quote from: tautech on October 14, 2024, 05:36:17 am ---
--- Quote from: AVGresponding on October 14, 2024, 05:21:51 am ---This appears to show the SPS5042X not going in to CC..?   :-//

--- End quote ---
;D
Study the V/div settings.  ;)

--- End quote ---

The first trace shows it exceeding 2.24V (40mA over 56ohms) for at least 40ms, and hitting the 8V CV setting.
The second trace (ramp down at power off) shows it was eventually in CC mode, but you don't show a longer timescale from power on to see it going from CV to CC mode.
It also looks like it was in CC at about 2.4V so probably closer to 45mA than 40mA.

tautech:

--- Quote from: Kean on October 14, 2024, 05:45:56 am ---
--- Quote from: tautech on October 14, 2024, 05:36:17 am ---
--- Quote from: AVGresponding on October 14, 2024, 05:21:51 am ---This appears to show the SPS5042X not going in to CC..?   :-//

--- End quote ---
;D
Study the V/div settings.  ;)

--- End quote ---

The first trace shows it exceeding 2.24V (40mA over 56ohms) for at least 40ms, and hitting the 8V CV setting.
The second trace (ramp down at power off) shows it was eventually in CC mode, but you don't show a longer timescale from power on to see it going from CV to CC mode.
It also looks like it was in CC at about 2.4V so probably closer to 45mA than 40mA.

--- End quote ---
OSD = 44mA

mawyatt:
Rob,

We agree with Kean.

This looks as if the CC is attempting in the 1st graph at ~5V, but voltage across 56Ω resistor continues up to 8V which is Voltage setting. If true CC Mode were active, then the voltage across the 56Ω resistor would limit at 40ma*56Ω = 2.24V and not continue to 8V.

Edit: Added response with 56Ω Resistor with SPD3303X, showing voltage across resistor. Note how the response approached the CC Setting of 40mA as set (2.24V across R) with the CV is set to 8V.

Can you rerun this 1st plot with time scale at 50ms/div (or longer if necessary) to show the supply output returning to the proper CC set to 40mA*56Ω or 2.24V?

Best,

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