TPS4H160-Q1: Protection mode of TPS4H160-Q1

Haim,

What are you using for the load? Is it an electronic load?

Im using a big resistor .  

Haim,

What I suspect is happening here is that the device is initially going into "thermal swing". This happens when the temperature of the controller inside the device drastically differs from the junction temperature of the FET on the device (it has to differ by T(SW) spec'ed in the datasheet).

After a few iterations of going into thermal swing, going out, going in again, the device eventually hits the absolute thermal shutdown T(SD)  and the device turns off. After time, does the device try to turn back on? If you set your scope timebase to something like one second do you see an iterative retry for the output?

We describe this behavior in the datasheet with the following figure:

Is any way I can suppress thermal swing for 16ms for example by improving the layout or using a heatsink ....

Haim,

The thermal swing is there to protect the device from damage so there is no way to suppress it. Are you testing this on an EVM? The EVM will have very favorable layout that would perform better than the 2s2p standard layout. Even with this though, layout changes or a heat sink would likely have minimal impact considering the short duration of the transient. 

Are you using all four channels of the device? The easiest solution here would be to switch to a lower RON device that has better performance at high currents like the TPS1H100-Q1. What is 8.45A pulse supposed to represent? Something like an inrush current? The TPS4H160-Q1 is only designed for 2.5A maximum continuous load current. 

Im testing TPS4H160 on my own PCB. Per design, my nominal current load is 1.7A  but per UL requirements my design should withstand 5 times the load for 16ms and the product should operate . Please advise on the device which is a better fit for my application.Thank you