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TPS1H100-Q1: about current limit

KU ethan
Prodigy 10 points
Part Number: TPS1H100-Q1

hi 

i am designing my project with TPS1H100-Q1 and have a question about setting current limit 

1. for version B,  is it  minimum external current limit to setting 0.5A?  if i would like to setting 0.3A for current limit, is it available ? and how to setting 

2.  i would like to know how thermal will be happened ? 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

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

   is its meaning  to include External programmable current limit and Internal current limit?

  • 0
    TI__Mastermind 28260 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