Power management

Power management forum

LM5015: Start-up inrush current of LM5015

Yuting Li

Intellectual 1420 points

Part Number: LM5015

Hi team,

Customers use LM5015 and input is 24VDC, output is 17VDC and -7VDC. They found the inrush current of transformer primary side is about 3.88A when start-up. The waveform is shown as below. What is the maximum current of the internal mosfet? Does it have risk? Any suggestion? Thanks

over 5 years ago

0 Marshall_Beck over 5 years ago

TI__Mastermind 35210 points

I will need to follow up the team.

I need to understand if current limit is active in startup or changes value.

Seems the current is exceeding device HS current limit.

0 Marshall_Beck over 5 years ago in reply to Marshall_Beck

TI__Mastermind 35210 points

In addition, can you please provide schematic and power conditions under which this test was performed?

0 Yuting Li over 5 years ago in reply to Marshall_Beck

TI__Intellectual 1420 points

Hi Marshall,

Thanks for your reply.

Does it trigger current limit?

I have asked customer to provide schematic and sent to your email later.

0 Marshall_Beck over 5 years ago in reply to Yuting Li

TI__Mastermind 35210 points

Hello Yuting,

I am going to review the schematic and will get back to your comment.