LT8390, LT8390A

Hello,

The diode is used to block current coming back into the INTVCC. You should use diodes that are fast, typically schottky diodes are used as they have very good reverse recovery time, this should minimize the losses.

Regards,

Jhun

Hello,

Thank you for your reply.

Please can you tell me what happens if I don't add a diode?

Regards,

The current that returns to the Bias Supply might damage the bias, destroying your system.

Read about how bootstrap circuit works. The diode also lets the Voltage on the High Side to be greater than the Bias in order to drive the top FET.

LT8390 and LT8390A have internal diodes from BST1/BST2 to INTVCC.

It`s unclear for me also why external diodes used in all LT8390A circuit examples.

LT8390 and LT8390A have internal diodes from BST1/BST2 to INTVCC.

It`s unclear for me also why external diodes used in all LT8390A circuit examples.