• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 947 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.

TPS63901: Design for Intrinsic safety

Jesse Teat
Prodigy 25 points
Part Number: TPS63901
Other Parts Discussed in Thread: TPS63900,

We would like to use the TPS63901 in an intrinsic safety application. Creating a 3v5 output power supply for an LTE M/NB modem from a battery pack (LiSOCl2 battery and parallel super cap) 2.0-3.67v source. Assuming an ATEX style (Fuse - Diode) barrier is implemented before Vin, is any further protection required for this Buck-Boost IC? We will run it in unlimited input mode with an absolute max load current of 0.5A.  This image shows the circuit with the TPS63900. But we intend to use the TPS63901 in this instance.

I am skeptical that reverse current protection for the TPS63901 may be required and that voltage limiting might be required on the Vout of the Buck-boost IC to protect downstream circuits.

  • 0
    TI__Mastermind 32350 points

    Hi   Jesse,

    For safety,  a diode in series before the input caps is a good option. but it will poor down your efficiency.  i am not sure it is acceptable or not.

    If this diode is not acceptable, caps as close as to the device is necessary.  100uF should be in big package and it is not easy to be located close to device, right? may be another 10uF cap will help.

    Reverse current protection is used to make sure there is no current will flow into battery from TPS63901, right?  it should be ok with TPS63900/1, because, device will work in PFM mode in light load and absolutly no current will reverse from output cap when device is shunt down.

    No additional over voltage protect feature in TPS63901. When the output of TPS63901 is unregulatable, i think the device is damaged already. may be another load switch in series between the output of device and next stage may help. 

    Regards

    Tao