LM62435-Q1: Schematic review

Baptiste CHERDLE

Intellectual 300 points

Part Number: LM62435-Q1

Hello,

Is it possible to perform a schematic review of the attached schematic

Thanks in advance,

B.CHERDLE

03.2-Power2.pdf

over 3 years ago

0 Samuel Jaffe over 3 years ago

TI__Mastermind 25590 points

Baptiste,

How much output current? The 22uH inductance is much larger than what would normally be recommended for this device. 22uH aligns with our recommendation in equation 8 in the datasheet if you have 0.8AOUT nominal.

-Sam

0 Baptiste CHERDLE over 3 years ago in reply to Samuel Jaffe

Intellectual 300 points

Hi Sam,

thanks for your reply. There is a mistake in the schematic, the partnumber of the inductor is correct but the attached value was incorrect. The inductor used value is 2.2uH.

Is it better ?

Baptiste

0 Samuel Jaffe over 3 years ago in reply to Baptiste CHERDLE

TI__Mastermind 25590 points

Baptiste,

2.2uH is optimal for 1.7AOUT. Is this your output load condition? If not, see equation 8 in the datasheet to size the inductor optimally.

Schematic:

You can replace C329 and C337 with 4.7uF 50V capacitors if cost is a concern. Or remove one of the capacitors (if they're rated for 50V). Otherwise keep them as they are.
RBOOT (R320) should be 0-ohms unless you need more margin on your EMI result. This should only be increased after seeing the results of your EMI test. Anything above 0 ohms will hurt efficiency and help EMI but you should check if you need to help EMI before hurting efficiency.
Otherwise looks good!

-Sam

0 Baptiste CHERDLE over 3 years ago in reply to Samuel Jaffe

Intellectual 300 points

dear Sam,

Thanks for your feedback.

Yes our application output load condition is arroung 1.7A.

Regarding your recommandation, we note them and we will update values if needed during our validation.

Thanks for your analysis

Best Regards,

Baptiste

0 Baptiste CHERDLE over 3 years ago in reply to Samuel Jaffe

Intellectual 300 points

dear Sam,

Thanks for your feedback.

Yes our application output load condition is arround 1.7A.

Regarding your recommandation, we note them and we will update values if needed during our validation.

Thanks for your analysis

Best Regards,

Baptiste

Power management

Power management forum

LM62435-Q1: Schematic review