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TPS54362 current jump up to 10mA when VIN>28V

Genius 4360 points

Replies: 4

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Hi

I have TPS54362 Q1 with VOUT = 5V and 10V. They running in DCM mode but only when VIN is less than 28V, after that it the current jumped more than 10mA (without load).

I checked the datasheet and there nothing mention or explained coming out from DCM to CCM when VIN>28V approx.

How to keep in DCM or pulse skipping mode for all VIN up to 50V?.

Can you check with your eval board to comfirm similar issue here or they keep in DCM mode (low Iq) between 10V to 50V.

Thanks

R. 

  • Bump?, any progress?
  • In reply to richard payne:

    Can you post your schematics and some waveforms that demonstrate your issue? Also, I will move this to the automotive forum.

    Best  Regards,

    John Tucker

    BSR-MV DC/DC Applications

     

    “Working on an automotive power design? Read the E2E technical article Meet European Commission ADAS requirements with TI DC/DC for device recommendations and other helpful resources.”

     

  • In reply to JohnTucker:

    Below is the circuit designed for 5V0 modified for 1V8 including R19,R23,R24 and R31, either case they suffer similar problem as described when VRAW>28V the Iq jumped to 10mA due to change of operation mode. NB: The 1V8 load varies from 2mA in sleep mode to 150mA in active mode. 

    I lost calculation note for R19,R23,R24 for 1V8 but it based on datasheet procedure. There is no WebBench for this device. 

  • In reply to richard payne:

    Hello,

    I checked this in my lab using TPS54362EVM (standard EVM circuit) and on my EVM also device current increases to 10mA (comes out of LPM mode) when Vin is around 30V.

    Please seethe datasheet specification in Page-7 related to this and there is a high voltage threshold for disabling LPM mode.

    Regards,

    Murthy

    Find the right power solution for your processor or FPGA. Visit www.ti.com/SoCPower today!

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