TPS552872-Q1:Question about the temperature characteristics of TPS552872-Q1.

Jung Jae Yeoul

Prodigy 10 points

Part Number: TPS552872-Q1

데이터시트에 있는 애플리케이션을 이용하여 12V/2A 제품을 설계했습니다.
본 제품의 온도 테스트 중 110도에서 레귤레이터가 작동하지 않는 증상이 있었습니다.
해결책을 알고 싶습니다.

입력전압 : 9~33VDC

출력 전압 : 12VDC

3 months ago

0 Brigitte 3 months ago

TI__Guru 59715 points

Hello Jung Jae,

The expert for this device is out of the office until next week. Please expect an answer then.

BTW, you posted your question on the English E2E. I recommend either posting it again on the Chinese E2E or translate it to English for others to understand it.

Best regards,
Brigitte

0 Jung Jae Yeoul 3 months ago in reply to Brigitte

Prodigy 10 points

Input voltage: 24VDC
Output voltage: 12VDC/2A

This issue has been resolved, but I have some questions.
The input voltage of PW_EN (EN/UVLO) is configured as a circuit.
However, we confirmed that the PW_EN voltage drops below 1V when the temperature rises to 110 degrees.

So, I solved this problem by lowering the resistance by 10 times and changing it to 10K and 7.5K.
If the SOURCING CURRENT is 4.4~5.6uA, it seems to work fine, but why does this problem occur?

0 Brigitte 3 months ago in reply to Jung Jae Yeoul

TI__Guru 59715 points

Hello Jung Jae,

Is it possible that the voltage drop on the diode increases heavily at this temperature? Normally voltage drop is temperature dependent.

Another possibility is the leakage current of the diodes. Leakage current of Schottky diodes is normally increasing heavily at high temperature.

Best regards,
Brigitte

Power management

Power management forum

TPS552872-Q1:Question about the temperature characteristics of TPS552872-Q1.