LMG1020EVM-006: clamp diode selection

Toshiro Imi

Part Number: LMG1020EVM-006

Hello,

Since our customer try to evaluate a laser diode by using LMG1020EVM-006 and he has a question how to select clamp diode.

Could you please help him out the clamp diode selection guide line.

Best regards,

over 4 years ago

0 Mamadou Diallo over 4 years ago

TI__Genius 13445 points

Hello Toshiro-san.

Thanks for reaching out.

Can you share what part of the circuit customer need clamp diode for?

Can you also confirm that customer plan to use the EVM according to "Section 3 Electrical Performance Specifications"?

Regards,

-Mamadou

0 Toshiro Imi over 4 years ago in reply to Mamadou Diallo

TI__Expert 7170 points

Thank you for your feedback. I have attached what he needs to know. The parts location he needs your suggestion is D1 clamp diode in the EVM document Figure 4.

best regards,

clamp diode.pdf

0 Mamadou Diallo over 4 years ago in reply to Toshiro Imi

TI__Genius 13445 points

TOSHIRO-SAN,

We chose D1 based on (i) peak reverse voltage capability (ii) its low forward voltage drop (ii) peak forward current (iii) reverse breakdown voltage.

The main thing is to ensure the diode voltage ratings is sufficient higher than the operating bus voltage, if you noticed, this is EVM is rated for 75VDC and we chose diode voltage rating with sufficient margin to account for shifts across temperature, voltage, etc...

Regards,

-Mamadou

0 Toshiro Imi over 4 years ago in reply to Mamadou Diallo

TI__Expert 7170 points

Thank you for your help. I am not sure this is enough for him but your suggestion must be helpful to define appropriate clamp diode selection for him.

best regards,

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LMG1020EVM-006: clamp diode selection