LM5069: schottky diode question

Patrick Chen

Mastermind 8875 points

Part Number: LM5069

Hello

Please add a schottky diode on the +24_in side. Please see the figure comparing to our reference schematic

Regarding this one, do you have suggestions on how to choose materials? What is the function of this?

Patrick

over 7 years ago

0 Rakesh over 7 years ago

TI__Guru** 105361 points

Hi Patrick,

Are you asking about the selection procedure of Schottky diode?

Best Regards,
Rakesh

0 Patrick Chen over 7 years ago in reply to Rakesh

Mastermind 8875 points

Yes. Thank you.

0 Rakesh over 7 years ago in reply to Patrick Chen

TI__Guru** 105361 points

Hi Patrick,

The function of Schottky diode at the output is to clamp the negative going voltages at the output. When the MOSFET experiences a severe overcurrent event, such as a short circuit, the output of the device will experience a large negative dip. An output Schottky diode is placed at the output to clamp the voltage when it dips.

The forward voltage of Schottky diode should be in the range of 0.3V to 0.5V at rated current of the system

Best Regards,
Rakesh

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LM5069: schottky diode question