LM5117: LM5117 Circuit review

Hsu cheng

Expert 1565 points

Part Number: LM5117

My customer conditions are as follows:

Vin:48~54V

Vo: CC:32V~40V

CV:32V

Po:600W

Please help the Review circuit and layout 600W DC-DC-V01.pcbas follows:

over 5 years ago

0 Gavin Wang (Zejing) over 5 years ago

TI__Expert 3480 points

Hi Hsu ,

What is U3? What is the parameter of L2? What is your application n and end equipment?

Gavin

0 Hsu cheng over 5 years ago in reply to Gavin Wang (Zejing)

Expert 1565 points

Battery application to do CC/CV control

0 Gavin Wang (Zejing) over 5 years ago in reply to Hsu cheng

TI__Expert 3480 points

Hi Hsu ,

What is U3? What is the parameter of L2? If you don't clarify these, we can't do review.

Gavin

0 Hsu cheng over 5 years ago in reply to Gavin Wang (Zejing)

Expert 1565 points

Currently customers U3 and L2 are removed.

0 Gavin Wang (Zejing) over 5 years ago in reply to Hsu cheng

TI__Expert 3480 points

Hi Hsu ,

I go through the schematic. Pls use smaller Qg mosfet.

Gavin

0 Hsu cheng over 5 years ago in reply to Gavin Wang (Zejing)

Expert 1565 points

Does the LM5117 have a voltage range that limits the input voltage and output voltage?

0 Gavin Wang (Zejing) over 5 years ago in reply to Hsu cheng

TI__Expert 3480 points

Hi Hsu ,

I suggested you to use smaller Qg mosfet because LM5117 has VCC current limit. Higher Qg will have higher driving current which may hit the current limit of the controller.

Gavin

0 Hsu cheng over 5 years ago in reply to Gavin Wang (Zejing)

Expert 1565 points

How small is QG to try?

0 Gavin Wang (Zejing) over 5 years ago in reply to Hsu cheng

TI__Expert 3480 points

Hi Hsu,

Please use quick calculator in TI.com to verify you Qg.

Gavin

Power management

Power management forum

LM5117: LM5117 Circuit review