LM3421 Unloaded voltage is unstable.It will fluctuate back and forth around 5V.How can I stabilize the no-load voltage?
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LM3421 Unloaded voltage is unstable.It will fluctuate back and forth around 5V.How can I stabilize the no-load voltage?
Hi Xie,
No the output votlage cannot be controlled to a fixed level if there is no load at the output. Again, the LM3421 is a current regulator. The voltage will ramp up until it reaches a the controlled current but being that there is no load there it will never reach the controlled current. The only thing you can control is the Over-voltage protection level so when the voltage reaches that point it will shut down and restart.
Thanks Tuan