I am designing a SMPS with a PFC correction circuit and then a 390V to 24 V DC-DC converter. Both the PFC chip and the DC-DC converter chip require a 12v VCC. Any suggestions for a circuit? I was thinking of using a resistor and a cap with a clamp after the diode bridge, but it is about 30 mA and that would be quite a bit of wasted power. Another option would be a flyback converter. Would running this off the Diode Bridge mess with the PFC? Any suggestions?
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PFC Power Supply VCC
- Thread starter rffx
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Searching with the keyword 'bootstrap' (in addition to more obvious terms such as SMPS) brings up plenty of ideas.
TI app note SLYT077:
A better bootstrap/bias supply circuit (PDF)
2005, so perhaps a bit old. But seems to still be valid.
That's just an example. Plenty of others.
TI app note SLYT077:
A better bootstrap/bias supply circuit (PDF)
2005, so perhaps a bit old. But seems to still be valid.
That's just an example. Plenty of others.
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- #5
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