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East Tester ET5411A+ (and ET5410A+) Electronic Load: Schematic reversed...

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KubaSO:
In the output stage, a TL072 drives 3nF of NMOS gate capacitance through a \$100 \Omega\$ resistor. TL072 has a fairly anemic output - about 25mA max. The series resistor doesn't help drive strength either. For a gate driver, that's very anemic. A buffer stage would make things better.

andyB2022:
Anyone that tried to download the firmware from GD32F303VET6?

temperance:

--- Quote ---In the output stage, a TL072 drives 3nF of NMOS gate capacitance through a 100Ω resistor. TL072 has a fairly anemic output - about 25mA max. The series resistor doesn't help drive strength either. For a gate driver, that's very anemic. A buffer stage would make things better.
--- End quote ---

Not only the drive current is a problem. The open loop output impedance of the TL072 is 125 R and responsible for a phase shift in the feedback. Good luck trying to compensate that. Or you buffer the op amp or you have to implement a different compensation network.

Luv2Learn:
I know this thread is old but I have a ET 5410a+ that I'm having issues with. Any help would be appreciated.  It will show the voltage of the source that's hooked up but will not draw any current. There is a bad trace on the main board between p1 and p12 but if I jump it it will start to draw current automatically no matter if it's on or off.  I posted your schematics in the repair thread. I hope that's ok

enoch247:
@morris6: How did you figure out the pinout of the LCD controller? I am working on an open firmware alternative to the factory firmware. I've gotten the current and voltage regulation working and am now working on the user interface. I can't find any datasheet for the LCD. Thanks!

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