LM5013-Q1: Schematic and layout check

Matthew Pole

Part Number: LM5013-Q1

Hi, can I check my schematic and layout please? I need a 9-60V input with a 8.5V (Ignore the 12V comment on the sch) output with less than 1A current draw:

I have tried to minimize any loops as much as possible.

Thank you!

over 1 year ago

0 Colin Chen over 1 year ago

TI__Mastermind 22821 points

Hello Sir,

I have calculated your conditions and below are what I recommended for design:

And layout looks good to me, thanks~

B R

Colin

0 Matthew Pole over 1 year ago in reply to Colin Chen

Intellectual 350 points

Hello,

that is great, thank you!

what is the difference in using the larger Ra value? Also why do you need a voltage divider on EN? Won’t that just add sleep current when it’s not needed?

thanks!

0 Colin Chen over 1 year ago in reply to Matthew Pole

TI__Mastermind 22821 points

Hello Sir,

EN divider resistors is not necessary for your design and you can directly tie EN pin to VIN.

Too small Ra can lead to higher FB injection ripple and this can cause Vout is higher than the value you set.

So I suggested increase Ra a bit.

Thanks

Colin

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LM5013-Q1: Schematic and layout check