| Electronics > Beginners |
| DIY 0-30V 0-3A ...Again |
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| xavier60:
Is the -5V ok? |
| m3vuv:
in a word yes,well i actualy measure 5.1v,forgot to say i have used MC34071 ops |
| xavier60:
What are the voltages on the inputs and output of the CC op-amp while in the fault condition. Also the voltage across the CS resistor. |
| m3vuv:
what do you mean by the fault condition?,it just doesent limit current,if i adjust the current pot ,the output drops to zero when the cc led lights,if i adjust it so its off i get output but it will supply max power regardles of the current pot setting. |
| xavier60:
Check the voltage range on pin 3 of the CC op-amp. The CC Pot should smoothly vary it from near zero to about 1.5V The voltage on pin 3 should decease with increasing load current, by about 0.5V/amp. Pin 2 should always be zero volts. The power supply is supposed to go into CC mode when pin 3 drops to zero volts. Use the negative output terminal as the reference for all measurements. Im looking at the schematic in Reply #42 |
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