PTN78020W: relation between free-air temperature and aging test temperature

Huang Feng

Part Number: PTN78020W

Dear team,

I get a problem:

First party requires us to do aging test with 65℃/24h. We have a PTN78020W on the board and it increase to 67℃ when room temperature is 27-28℃.

In this case, when room temperature is 65℃, the PTN78020W will reach 105℃, which is over 85℃ ABSOLUTE MAXIMUM RATINGS in datasheet.

Specally, the PTN78020W is a multi-chip device without a Jc parameter, so I do not know how to check the device can be aging test in 65℃/24h or not.

Best regards,

HuangFeng

over 2 years ago

0 Jimmy Hua over 2 years ago

TI__Guru 50120 points

Hello Huang Feng,

I will check to see if there are any information on aging test done on this during product definition.

When I get more details on this I will get back to you.

Regards,

Jimmy

0 Huang Feng over 2 years ago in reply to Jimmy Hua

Prodigy 90 points

Hello Jimmy,

Is there more information?

Thanks

HuangFeng

0 David Baba over 2 years ago in reply to Huang Feng

TI__Mastermind 33180 points

Hello Huang,

We are still trying to find the information, thank for your patience.

David.

0 David Baba over 2 years ago in reply to David Baba

TI__Mastermind 33180 points

Hello Huang,

We could not find age testing data. however the spec you are looking at is the operating free air temperature. This is not the temperature of the device and should not be confused with it. At an operating temperature of 85C the device will be higher than 85C. The max junction temperature is typically 125C of our devices.

hope this helps.

David.

Power management

Power management forum

PTN78020W: relation between free-air temperature and aging test temperature