• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 321 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS2590EVM: OCP Protection

GARETH OU
Guru 11435 points
Part Number: TPS2590EVM
Other Parts Discussed in Thread: TPS2590, TPS2597, TPS2595

Hi

Customer is looking for eFuse, 12V voltage input, needs 2.5A OCP protection. They tested the TPS2590 EVM, but found some problems during the test:

(1) With a load of 2A, start up 12v, it will enter the fault and have no output. It must be powered on 12V first, and then draw 2A, it will be normal.

(2) After pumping 2.5A into protection, if the load is lowered to 2A, it will still fail and not recover (with retry mode set). The pumping load must be reduced below 1A or the pumping will be released before it can resume.

Is the above problem caused by startup exceeding 5W and MOSFET entering SOA protection? Will TPS2597 have similar problems? Or are there other similar ICs you can recommend? Thank you!

  • 0
    TI__Guru* 79181 points

    Hi Gareth,

    1. May be efuse is hitting thermal shutdown because during startup stress is high on efuse due to high power dissipation (VIN-0)*Inrush current. Please do not use CC load to test. Use real load or CR load. Using CR load will cause less stress. This is from datasheet , you have to keep load less than 1A during startup.

    I will highly recommend moving to TPS2597 as it is a latest next generation device. We also have TPS2595 device. But one thing to note is that using CC load during startup will not help because real load will have some turn on threshold , it can not draw current when VOUT is very low , it will start drawing current when VOUT has risen to some 1V , also it may not draw constant current, it will generally draw current like constant power load or resistive load. 

    TPS2597 can startup into 2A resistive load, it can also startup into 2A CC load with turn on threshold around 0.1V. Also output cap value affect startup current and stress .

    Regards

    Kunal Goel

  • 0 in reply to Kunal Goel
    TI__Guru* 79181 points

    Hi Gareth,

    Also what is the application ? and what is load type? 

    Regards

    Kunal Goel