LM5122: Schematic Review for 13V-out/10A

Henry Wang3

Part Number: LM5122

Hi Sirs,

My customer is developing a board for LM5122 for 12V-in to 13V-out with 10A output current. (Vin_min is 11.5V, Vin_max is 12.5V)

Could you please help to check and advise the schematic?

Thanks for your support.

0 dehuan Qi over 4 years ago

Hi .

1) advise parallel a 100pF cap with R407

2) add a 330pf cap between Pin10 and Pin 11

3) the power should as below:

4) R409 change to 2512 package.

5) Q401 and Q402 change to 40V MOS

6) L6 change to CMLB1717T-2R2MS.

0 Henry Wang3 over 4 years ago in reply to dehuan Qi

Genius 3355 points

Hi Sir,

My customer follows your comments to modify the schematics, could you please help to review it again?

Thanks for your support.

+1 dehuan Qi over 4 years ago in reply to Henry Wang3

Hi,

About L6, use the CMLB177T-2R2MS the DCR is lower, and can get the better thermal performance. so this base on your thermal condition.

PJQ5450 Rdson is too big , advice change Rdson lower than 10m0hm, of cause this is also base on your thermal condition.

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