InnoSwitch minimal Vdrain

Hi,

Could you please give your complete power supply specifications.

Regards,
PI-NANO

Hi,

The power supply specifications are:

Input: 36 to 374 Vdc;
Output: 5,0 V / 2,5 A.

Regards,
Christos

Hi, 

Innoswitch can still power on at 36VDC, however with temperature varations and lot to lot variation of the parts, it may experiance difficulty in powering up at lower input voltages. That is the reason we specify 50V DC in the datasheet.

However if you supply the BPP pin externallly at such a low voltage, you can use the Innoswitch devices for your application.

Regards,

PI-NANO

Hello - Please provide a reference(s) for the BPP external support at low voltage.   I'm assumming that the InnoSwitch-EP can be used as a flyback PS without AC front end?.  Are there any stability issues using an external BPP scheme?   This chip is very much needed for our industrial inverter design for 1) voltage DC range,  2) non-lock up due to pin injection testing - among other reasons.

Cheers

Al Lehman

Hi,

I am afraid to say that I do not have any reference design to show you with external support at BP pin voltage since this is not usual.

You could use a linear regulator while starting up the power supply and then once the bias winding voltage up, you can bypass the linear regulator with the bias winding output to reduce the losses associated with linear regulator.

Yes, It can work with DC voltage as well. I do not expect to see any stability issues withe external supply.

If you still have questions or need design help, please contact one of our field office in your geographical region. You can find our filed office locations at following page.

https://ac-dc.power.com/sales/

Regards,

PI-NANO

Hi, Al Lehman. I intend to use an integrated start-up circuit of Microchip, the LR745. Take a look at our preliminary design, but note that IT WAS NOT TESTED YET.

PI-NANO, your comments about this solution (and about de whole design) would be very wellcome!!!

Regards.
Christos

Example design specifications

Input voltage: 38~370 Vdc & 85~265 Vac;

Main output: 5.1 Vdc / 0.75 A;

Additional isolated outputs: 14 V / 0.08 A & 5 V / 0.02 A.

Hi Christos,

Schematic looks fine to me .

Make sure that the bias winding output voltage is higher than the linear regulator output voltage so that linear regulator does not conduct during normal operation.

I would also suggest you to add an additional diode from bias winding output to isolate the bias supply from linear regulator inorder to avoid any circulating currents during transient conditions.

Regards,

PI-NANO