LM34936: spec check

GARETH OU

Guru 11495 points

Part Number: LM34936

D28 you need to add the schematic?

over 4 years ago

0 Stefan Schauer over 4 years ago

TI__Guru 58941 points

Hi Gareth,

thanks for posting on E2E forum.

See below excerpt from the Datasheet which should answer your question:

Bypass the VIN pin to AGND with a low ESR ceramic capacitor located close to the controller IC. A 0.1 µF ceramic capacitor is typically used. When using external BIAS, use a diode between input rails and VIN pins to prevent reverse conduction when VIN < VCC

Best regards,

Stefan

+1 Stefan Schauer over 4 years ago in reply to Stefan Schauer

TI__Guru 58941 points

Hi Gareth,

I have not seen a reply for the last 20 days.

So I assume that this issue can be closed? If yes, it would be great to click the resolved button.

Thanks,

Stefan

0 GARETH OU over 4 years ago in reply to Stefan Schauer

Guru 11495 points

Hi Stefan

If Vin is greater than VCC, then Diode needs to be added?
In addition to backflow, what else does it do?

0 Stefan Schauer over 4 years ago in reply to GARETH OU

TI__Guru 58941 points

Hi Gareth,

if Vin is always greater the Vcc the Diode is not required. It only has the function to avoid current flowing back to the source as this is not prevented by the internal circuit of the LM34936.

Best regards,

Stefan

+1 GARETH OU over 4 years ago in reply to Stefan Schauer

Guru 11495 points

Hi Stefan

got it ,thanks

Power management

Power management forum

LM34936: spec check