LM5118: LM5118 weird current waveform

Frank Xiao

Genius 12055 points

Part Number: LM5118

Hi team,

My customer is using the LM5118 now. The input is 9~40v, the output is 24v 3A. When the input voltage is 30v, the current waveform is below. Do you think the waveform is ok or not? Thanks.

over 7 years ago

0 Youhao Xi over 7 years ago

TI__Guru* 78170 points

The circuit seems running in "soft" buck-boost mode. Do you have output regulation? If yes, there should not be a concern.

0 Frank Xiao over 7 years ago in reply to Youhao Xi

TI__Genius 12055 points

Hi Youhao,

The output regulation is ok. Could you please explain more about the “soft" buck-boost mode. Thanks.

0 Frank Xiao over 7 years ago in reply to Frank Xiao

TI__Genius 12055 points

Hi Youhao,

See the load regulation performance:

0A 25.02V
0.3A 25.02V
0.6A 25.02V
0.9A 25.01V
1.2A 25.01V
1.5A 25.01V
1.8A 25.01V
2.1A 25.01V
2.4A 25.01V
2.7A 25.01V
3.0A 25.01V
The line regulation is ok too.

Thanks.

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LM5118: LM5118 weird current waveform