• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 804 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.

TPS25921A vs TPS259271

kura
Genius 4840 points
Other Parts Discussed in Thread: TPS25921A

We have question about differences between TPS25921A vs TPS259271

(1)About Thermal shutdowm and retly function,I understand following diffrence. 

TPS25921A T(TSD)-20 degreeC Auto retly

TPS259271 TSHDN - 10degree C    Auto retly

Is my understanding correct?

(2)Over current protection and retly. 

I could find overload and Hot short waveform of TPS25921A(datasheet P10 Figure23 ,24 and P24 figure41,42,44)

TPS259271 (datasheet P11 Figure27,28,29,30,31)

Names of  waveform are difffrent.But Both IC behaviors of Over current protection are same like below.

Curent reach I FASTRIP or ILIM ---> regulate to IOS ----> TSD--->retly

Is my understanding correct?

regards,

  • 0
    TI__Guru** 105361 points
    Hi Kura,

    Please find my response below.

    (1) About Thermal shutdown and retry function
    Both devices TPS25921A and TPS259271 have Auto-Retry function. As pointed by you, there is slight difference in TSD Hysteresis between these two devices.

    (2) Over current protection and retry
    The current limit, over load and Fast trip protection schemes are same in both the devices TPS25921A and TPS259271. The figure legends are represented as Hot short / Output Short Circuit in their datasheets but are meant for the same test condition. Here is how the device works...
    Current reach I_FASTRIP ---> device shutdown ----> regulate to IOS--> TSD--->retry
    Current reach I_over load ---> regulate to IOS--> TSD--->retry


    The major differentiation between these devices is current capability and reverse current blocking FET control.
    Let me know your application to suggest suitable device.

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    Genius 4840 points
    Thank you for your reply.
    Application is "SECURITY SYSTEM FOR POST OFFICE".
    regards,
  • 0 in reply to kura
    TI__Guru** 105361 points
    thank you!
    Let me know if any support is needed.

    Best Regards,
    Rakesh