LM5146-Q1: Please kindly help to review layout

Kai Hsiao

Guru 12675 points

Part Number: LM5146-Q1

Hi Sir

Please kindly help to review layout

If have any advise ,please let me know

Thanks

T-486#E-PCB.pdf T-486#E-SCC.pdf

over 5 years ago

0 Gavin Wang (Zejing) over 5 years ago

TI__Expert 3480 points

Hi Hsiao,

Can you help tell the spec? Vin=? Vo=? Io=?

Can you explain the signal meaning in the sch like V1B3, V2B, COM ?

Pls clarify the information so I can review your attachment.

Gavin

0 Kai Hsiao over 5 years ago in reply to Gavin Wang (Zejing)

Guru 12675 points

Hi Gavin

VIn=24V and Vout=5V/12A or 12V/8A

V1B3 = Vin

V2B connect to V2FB

COM = GND

0 Gavin Wang (Zejing) over 5 years ago in reply to Kai Hsiao

TI__Expert 3480 points

Hi Hsiao,

Vo=12V/8A, if L=6.12uH, inductor current ripple will be 45%.

Vo=5V/12A, if L=6.12uH, inductor current ripple will be 45%.

Because you have two output spec, you should have two current limit spec, which means two Rlim R236.

Gavin

0 Kai Hsiao over 5 years ago in reply to Gavin Wang (Zejing)

Guru 12675 points

Hi Gavin

Thanks for your suggestion

"Please kindly help to review layout first "

The schematic resistor / inductor / cap value we will modify by myself

0 Gavin Wang (Zejing) over 5 years ago in reply to Kai Hsiao

TI__Expert 3480 points

Hi Hsiao,

Can you send PCB file(not just the picture) to me through e-mail so that I can see the trace?

gavin-wang@ti.com

Gavin

0 Kai Hsiao over 5 years ago in reply to Gavin Wang (Zejing)

Guru 12675 points

Hi Gavin

Thanks for your help

Attached file is pcad 4.5 Layout pcc file

T-486#E.rar

0 Gavin Wang (Zejing) over 5 years ago in reply to Kai Hsiao

TI__Expert 3480 points

Hi Hsiao,

I can't open your attached file. Let's close this poster first and please contact me through e-mail shown below.

gavin-wang@ti.com

Gavin

Power management

Power management forum

LM5146-Q1: Please kindly help to review layout