LM25145: external bias

Sam Ting

Part Number: LM25145

Hi team,

We're looking for a high voltage LDO as the external bias source for LM25145. The max input voltage is 24V-32V, but we have no idea about the max bias current. Could you please provide some solutions? Thanks!

Best regards,
Sam Ting

over 5 years ago

0 Iven Su over 5 years ago

TI__Expert 8245 points

Hi,

The max bias current needed will not exceed VCC short-circuit current which is 50mA typical as its datasheet describes.

0 Sam Ting over 5 years ago in reply to Iven Su

TI__Expert 3560 points

Hi Iven,

Thanks for your quick response!
Should we add some current for the supply of internal gate drivers? Thanks!

Best regards,
Sam Ting

0 Iven Su over 5 years ago in reply to Sam Ting

TI__Expert 8245 points

Hi,

It should be OK if you use a capacitor in VCC to GND, the capacitor will offer high peak current for driver.

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LM25145: external bias