LM3478EVAL: Rbyp Function

Renan Santos Adriano

Part Number: LM3478EVAL

Hello Team,

Can you share with me what is the purpose/function of Rbypass, as shown on this forum page?

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/209049/lm3478-evaluation-board/740434

Thank you in advance.

Regards,

Renan

over 2 years ago

0 Brigitte over 2 years ago

TI__Guru 64620 points

Hello Renan,

The resistor and the capacitor on VIN form a filter for the switching noise. So the voltage on the VIN pin and inside the device is getting more quiet compared to without these components.

Best regards,
Brigitte

0 Renan Santos Adriano over 2 years ago in reply to Brigitte

TI__Mastermind 21470 points

Hello Brigitte,

Thank you for this response. Can you share with me why is the inductor fed from the input of Rbypass, and not the output?

Regards,

Renan

0 Brigitte over 2 years ago in reply to Renan Santos Adriano

TI__Guru 64620 points

Hello Renan,

The inductor is fed from VIN, not the input of Rbypass. Rbypass is only for the input of the IC relevant.

Best regards,
Brigitte

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LM3478EVAL: Rbyp Function