LM5118: LM5118 UVLO pins issue

Kasun Rathnapala

Part Number: LM5118
Other Parts Discussed in Thread: LM5170EVM-BIDIR, LM5170,

Hi,

I am designing a battery charger and I am taking LM5170EVM-BIDIR as my reference. I am using LM5118MH/NOPB to get 10V to LM5170. LM5118MH/NOPB is working as a buck boost.

I am using the same schematic diagram (with parts) in LM5170EVM-BIDIR board's LM5118MH/NOPB section.

But I m getting the same issue mentioned in this link - https://e2e.ti.com/support/tools/sim-hw-system-design/f/234/p/888098/3284915?tisearch=e2e-sitesearch&keymatch=LM5118%20uvlo#3284915

I dont understand why the UVLO pin goes high and low as mention in the above link even i followed the same schematic.

PCB is a 4 layer board.

What can I do to make it work?

Thanks

over 5 years ago

0 Kasun Rathnapala over 5 years ago

Prodigy 230 points

This is schematic and layout

0 Brigitte over 5 years ago in reply to Kasun Rathnapala

TI__Guru 65610 points

Hello Kasun,

Please give us a few days to get back to you as today is a bank holiday in US.

0 Kasun Rathnapala over 5 years ago in reply to Brigitte

Prodigy 230 points

Hi, any suggestions to get the chip working?

0 Garrett Roecker over 5 years ago in reply to Kasun Rathnapala

TI__Mastermind 21720 points

Kasun,

What is the purpose of inductors between the PGND and the AGND pin? Theses should just be connected to the each other on the EP of the LM5118. There is not reason to have the inductors between the pins.

Please try connecting these pins together.

Thanks,

Garrett

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LM5118: LM5118 UVLO pins issue