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L6562 output voltage

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alok1982

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As all we know L6562 is a transition mode PFC controller.
I am designing a boost circuit which should give Constant voltage of 400Vdc at output, even input voltage varies i.e. 90Vac to 270Vac.

But problem is that I am getting output of as 460Vdc. I want to reduce it, please suggest how I can?

L6562 datasheet attached here. Also, basic schematic is also there in datasheet.
 

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  • L6562 datasheet.pdf
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Well the voltage divider on pin 1 is the place to start. Are you certain the resistors are right?
Pin-1 should be 2.5V. Check that.
Pin-2 should be ?? (2.25 to 5.7V)? (with in the operating range what ever that is)
----edited----
Use an isolation transformer to be safe. This thing will hurt you.
 
Last edited:
Agreed - if pin 1 is at 2.5v then it's regulating ok, and you should check the divider. Is it possible that you're upsetting it by sinking too much current from pin 2?
 
You do know the 400 volts will have ripple. This is a power factor circuit. It is not designed to have very good 400 volts.
 
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