TPS2420: Design protection from short circuit of Device Under Test

Hi Chaw,

Yes efuse device will turn off due to high current and then start again to limit current to safe value. It will not need to be replaced.

What is your application input voltage and how much is max current DUT can draw in steady state?  I can recommend a eFuse .

Regards

Kunal Goel

Hi Kunal Goel,

The supply will be 3.3V at 5A.

Is to protect the 3.3V supply from the testing unit.

For example the testing unit supply is shorted, or there is a feedback higher then 3.3V.

I was given a small area on the actual PCB, to put in this circuit

Regards

CS

Hi CS,

I will recommend TPS25947 device. It can limit current upto 6A. You can select current limit based on requirement. It is 2mm*2mm QFN package. It can also block reverse current. So when DUT voltage  goes to higher than supply voltage this device will turn off and isolate supply from DUT. Please have a look at this device and let me know if you have any questions.

Regards

Kunal Goel

Thanks,

I'm looking at TPS2420. 

Which is better for my application? Can you advices?

Components for TPS25947 may a few more resistors, but if 0603 should fine.

Regards

CS

Hi CS,

TPS25947 will be best as it can also block reverse current as per your requirement. You mentioned that supply should be protected if there is feedback greater than 3.3V , so you need reverse current blocking. 

Please check EVM user guide for details on component selection and package info.www.ti.com/.../slvuc01.pdf

TPS2420 may not work because your system max current draw is 5A? You will want to limit current little bit more than this say around 5.5A. But TPS2420 is only a max 5A device.

Regards

Kunal Goel