800VDC input flyback supply
Does Power Intg have any parts that can be used to create an ~5W flyback power supply from 400 to 800VDC input?
Comments
Hi cjf3rd,
We can do the stackfet so we can operate at higher input voltage. See below link for your reference. Thank you.
At 800V in + 130V flyback you will need 600V from the PI part + a 600V fet say giving 1200V of capability with a stackfet configuration, to handle 930v at turn off.
The output diode will see Vo + 800V x turns ratio... thus a higher flyback voltage is beneficial here ...
Can't access (https://ac-dc.power.com/design-support/circuit-ideas/high-voltage-input-switching-power-supply-using-stackfet/)
How can I model DER-58 in PI Export?
Hi Karmen,
On the DER-58 report, there is transformer spreadsheet section on page 12. Just follow those inputs. You will have warnings on Vdrain voltage stress but just disregard it since it is using stacket. Thank you.
We tried the transformer spreadsheet section on page 12 of DER-58. Didn't work at higher voltages. Transformer manufacture suggested using a larger transformer described in DI-124. Also used PIXIs designer that leads to a different larger transformer. DER-58 only shows low voltage wave shapes pages 15-19. Do you have a support structure for StackFET? Is PIXIs designer the best tool for designing a transformer for a 580VAC StackFET design?
Hi Karmen C,
You might want to consider using INN2904K for your wide input requirement. It has 900V mosfet so you don't need the complexity of stackfet configuration. This is rated for 85-484 VAC, this might be enough already for your requirement. See below link of datasheet for your reference.
https://ac-dc.power.com/sites/default/files/product-docs/innoswitch-ep_family_datasheet.pdf
Sorry I figured out that you needs 800Vdc max input so INN2904K won't be enough for your requirement.
An half bridge is probably the safer approach here...