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About TPS57160-Q1 Hysteresis current?

Dear Automotive support member,

My customer select UVLO selection resistor.
Hysteresis current is 2.9μA(typ).

Would you teach hysteresis current are minimum number and maximum number?


Regard.

Bob Lee

  • I'll try and get to this tomorrow.

    - Scott

  • Hi Bob,

    The UVLO and hystersis is programmable and thus adaptable to the customers specific applicaiton requirements.  Hysteresis in this case is the difference in the VIN voltage as VIN ramps up where the part will be allowed to start operation (VSTART) in the formula on page 15 of the datasheet.  If VIN falls (goes under voltage) then the UVLO will detect this and shut off the output, this voltage level on VIN is called VSTOP.  VENA = 1.25V, IHYS = 2.9uA and I1= 0.9uA for the formulas. 

    Figure 10 and Figure 11 is the typical variance of the hysteresis over temp for both cases when only I1 at 0.9uA is supplied and the case when EN is above 1.25V and both I1 and IHYS are turned on.  Both of these are specified as typical only.  VEN is specified with a min (1.15V) and max (1.36V). 

    -Scott

  • Daer, Scott-san.

    I am so sorry to disturb the discussion with you & Bob-san.

     

    My customer is also asking concerning related Ihys.

    They are evaluating this device for Automotive Engine Control. As you know, Ta = -40 to 125 deg.C.

    They must consider all variation under such wide temperature range.

     

    Please let us know the following information to win the business. In the worst case, design spec is no problem.

    1. Ihys min. & max. (typ 2.9uA).

    2. Temperature tendency of Ihys. Just would like to know Ihys increase & decrease by which temperature, high

        & low.

    3. Vena is defined 1.15V - 1.38V under 25 deg.C.

        How about it under -40 & 125 deg.C?

    4. Temperature tendency of Vena. Just would like to know Vena rise & fall by which temperature, high & low.

    Best Regards,