TPS7B6950QDBVRQ1　　In-pin　timing

Hi Ishii-san,

Is there any difference between the conditions of good case and the bad case? Are both the good case and the bad case base on the same TPS7B6950-Q1 device?

This is the line transient test of TPS7B6950-Q1, and output voltage should be stable at 5V during this line transient test. BUT the line transient slew rate 40V/us is too fast, much faster than the normal operating conditions that in many automotive standard and that would occur in automotive systems.

Could you please inform the customer and application? Why do they use so fast line transient slew rate, is this according to any new automotive standard? Thanks!

Best regards,
Jason Liu
jason-liu@ti.com

Hello.

Input of TPS7B6950 is other system power supply.
In case of abnormal movement, this system power supply changes from 12V into 18V suddenly.
It changes in 40V/uS at the same time.
TPS7B6950 is a power supply of a microcomputer power supply.

When output of TPS7B6950 becomes in abeyance, that would be a problem.

Thank you.

Hi Ishii-san,

Thanks for the update!

What is the capacitor value at the input of TPS7B6950-Q1? And does customer need this 40V/us slew rate for the system?
If not required, suggest increase the input capacitor of TPS7B6950-Q1 to slow down the slew rate. This too fast has high possibility to trigger the internal ESD protection and shut down the device.

Best regards,
Jason Liu

Hello.

Thank you very much for your answer.

If not required, suggest increase the input capacitor of TPS7B6950-Q1 to slow down the slew rate.

Until how long should slew rate be lowered specifically? (10V/us etc)

Thank you.

Hi Ishii-san,

Suggest the input voltage ramp up slew rate lower than 10V/us, and 1V/us would be better.

Best regards,
Jason

Hello.

Thank you very much for your answer.

I estimated actually by a device.

The evaluation condition

Vin:6V⇒20V(slew rate=14V/us)、Io=7mA
Ta=-40,25℃,125℃

Result:OK

Would there be estimated data and simulated data by TI company?

I'd like to know how much there am me as a force.(up to 10V/us)

Thank you.

Hi Ishii-san,

what kind of data do you need?

Best regards,
Jason

Hello.

Thank you very much for your answer.

The condition.
in=6V⇒20V Io=7mA Ta=-40,25℃,125℃

I want data of the biggest through rate which moves.(Simulation or device Corrugated data)

Thank you.

Hi Ishii-san,

Suggest the input voltage slew rate lower than 10V/us.

Best regards,
Jason