Electronics > Beginners
10 Amps power supply with LM723
mike_mike:
V without load = 19.84V, V with load = 19.80V, load = 2.90A
V without load = 25.0V, V with load = 25.0V, load = 2.20A.
for the tests, I used a 0.33R resistor in parallel with the 0.18R.
So the circuit PCB was forced out of the power supply case, using the screwdriver, but on the PCB I did not found any problems while I was inspecting the PCB using the naked eye.
iMo:
What is your problem then? It seems it works fine.
mike_mike:
Hello, quick question about the attached schematic: somebody said to me that the current limit (current sense) is temperature dependent. Can you explain why is this happening ?
iMo:
In 723 the current sense is done via an NPN transistor on the chip (like your Fast CC). With temperature the trigger shifts -2mV/degC. Calculate what current do 2mVolts represent on the shunt resistor and you get the dependency in mA/degC.
lycralout:
A nice summary of design rules to note when using the 723 is contained in https://electronicprojectsforfun.wordpress.com/power-supplies/a-collection-of-proper-design-practices-using-the-lm723-ic-regulator/
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