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TPS1H100-Q1: Questions on power calculation, short to ground and minimum current limit for high side driver

Eric Mitchell
Intellectual 905 points
Part Number: TPS1H100-Q1

Hi team, 

My customer has a question on the TPS1H100-Q1. 


1. For the B Version of this device,  is the  minimum external current limit setting 0.5A?  Is it possible to set the limit to 0.3A for current limit? If so, how could I accomplish that? 

2.  I would like to know how thermal will be handled. PT= (VS -Vout )*limit current ? when shorting to GND at Vout  

 example : VS=12V  Vout =11.9 current limit =0.3

                 short to GND 

                PT=(12-0)*0.3=4W at TPS1H100-Q1

      In my understanding , VCS will be high level into MCU Pin  at same time and then Vin disable TPS1H100 immediately  in order to protect TPS1H that is not broken .

3. Form datasheet P.19 description :For better protection from the hard short to GND condition

   is its meaning  to include External programmable current?

Thank you, 


Eric Mitchell

  • 0
    TI__Mastermind 27280 points

    Hello,

    1- The current limit accuracy is defined when the limit set is above 0.5A. If the current limit set is below 0.5A, the accuracy is not defined. It is better to set the current limit above 0.5A.

    2- When output is shorted to GND, the device power losses is Pd = (VS - VOUT) x current limit. Your calculation is right. Yes Vcs will be high and the MCU may turn off the FET through VIN pin. The device is also thermally protected. When the junction temperature reaches the shutdown threshold, the FET is automatic turned off.

    3- The closed loop has some response time for regulating the current at the external setting. For protecting the device from high transient current, the open loop with around 1uS response time is implemented.

    Regards