dual output isolate power

user503335153

GBT grid driven isolated power supply for a half bridge drive power of a single IGBT，Dual channel output +15V/2W and -8V/2W .Push-pull or half bridge topology. Can you recommend a suitable scheme for me?

over 7 years ago

0 user503335153 over 7 years ago

Intellectual 810 points

DC input ：Vin = 23V or Vin =12V~24V

0 Ryan Manack over 7 years ago in reply to user503335153

TI__Intellectual 2610 points

Hello,

Thank you for your question.

We have a topology in mind, a flyback; main topic is that the xfmr is designed for lowest inter windings capacitance

in between primary and secondary.

PMP30387 shows a flybuck w/ single channel dual output +15V/-5V; negative winding needs redesign for -8V.

Thanks,

RyanPMP30387RevB.PDF PMP30387RevB_BoM.PDF

0 user503335153 over 7 years ago in reply to Ryan Manack

Intellectual 810 points

can you tell me the computing method form -5V to -8V ,and How to improve the output current to 300mA ?

0 Ryan Manack over 7 years ago in reply to user503335153

TI__Intellectual 2610 points

Hi,

The voltage is simply adjusted by the windings ratio. For 2x300mA you will need to check the input voltage range and so the resulting max peak current at the internal switch.

Attached are three transformers we've used with flybuck up to now. The transformer for the -9V is already pretty close and is specified for 200mA.

Regards,
Ryan

750317313r00 spec.pdf transformer 750315445r00 spec.pdf WE_750342984.pdf

Power management

Power management forum

dual output isolate power