TPS56637: OCP limit for 20V input and 5V output condition

Shenhua Zhang

Part Number: TPS56637

Hi Expert,

1. Can below circuit continuously output 5V/6A(30W), when input is 20V?

What will the thermal performance be with 5V/6A under nature cooling and typical layout condition?

2. What is the output current OCP limitation for below schematic? How to calculate and modify?

3. How will the converter respond when OCP happens?

0 Yuchang Zhang over 5 years ago

Hi,

1, it support this application, you can use webench to evaluate the thermal.

2, OCP is fixed value, can’t be changed, you can check page5 “current limitation” to get.

3, When hit OCP, current will be limited and then Vout will drop to hit UVP, then happen hiccups, you can check page15 datasheet for details.

Yuchang

0 Shenhua Zhang over 5 years ago in reply to Yuchang Zhang

Hi Expert,

Thanks for the info, however I cannot find thermal performance(tested thermal image) anywhere, no matter in EVM user's guide, or in Webench.

Please help check.

0 Former Member over 5 years ago in reply to Shenhua Zhang

Hi Shenhua,

Just refer to the thermal picture below from EVM for reference:

19V-5V/6A,15mins, Ta=25degC: Tc = 78.5degC

24V-5V/6A, 15mins, Ta=25degC: Tc = 85.6degC

Thanks very much.

Bruce

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