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LM5170EVM-BIDIR: LM5170

Raj B
Prodigy 55 points
Part Number: LM5170EVM-BIDIR
Other Parts Discussed in Thread: LM5170-Q1, LM5170

Tool/software:

Hi,

We have design the board as per EVM schematic. However while testing we could not enable brake  circuit. As per instructions in the EVM user guide , we Kept Pin 41 (SYNCOUT) below 0.8V  (logic Low), We closed Jumper J3 . Please guide.

Regards,

RajB 

  • 0
    TI__Mastermind 18065 points

    Hi Raj,

    Can you share the schematic?

    Are you operating in buck mode or boost mode?

    Best Regards,

    Feng

  • 0 in reply to Feng Ji
    Prodigy 55 points

    Hi Feng,

    I have shared schematic with you , pls refer private Message.

    Regards,

    Raj B

  • 0 in reply to Raj B
    TI__Mastermind 18065 points

    Hi Raj,

    You may short the circuit breaker and see if it works as a first step.

    And please note as described in the datasheet:

    If the steady-state differential voltage between the HV-Port and LV-Port is less than 10 V during power up, TI does not recommend the user to activate the failure detection function. Also, if the differential voltage is less than 8 V, TI recommends not to use the circuit breaker function of the LM5170-Q1 at all.

    So, I think you should not use circuit breaker function.

    Best Regards,

    Feng

  • 0 in reply to Feng Ji
    Prodigy 55 points

    Hi Feng,

    Thank you for your suggestion. I will do the same.

    Regards,

    RajB

  • 0 in reply to Raj B
    Prodigy 55 points

    Hi Feng,

    I shorted the circuit breaker and taken the readings by giving load from 0A to 4A. I found the output voltage regulation is not maintained. Pls see below readings.

    Setup : HV Port : 24V DC Power Supply  And LV Port : Electronic Load connected (expected  voltage at this Port 14.5 V DC)

    LM5170 - BUCK MODE Testing ( Brake Circuit Shorted with Thick Cooper Strip)
    INPUT OUTPUT
    POWER (W) VOLTAGE (V) CURRENT (A) POWER (W) VOLTAGE (V) CURRENT (A)
    0.41 24 0.016   18.5 +/-0.5* 0
    2.64 24 0.105 1.876 18.76 0.1
    19.4 24 0.803 18.33 18.33 1
    37.23 24 1.554 35.72 17.86 2
    54.04 23.97 2.257 51.9 17.3 3
    70.06 23.92 2.977 66.96 16.74 4
    Note : * At No Load Variation of +/0.5V observed 
  • 0 in reply to Raj B
    TI__Mastermind 18065 points

    Hi Raj,

    Please share some waveforms.

    Best Regards,

    Feng

  • +1 in reply to Feng Ji
    TI__Mastermind 18065 points

    Hi Raj,

    I will close this thread as it is discussed in another thread.

    Best Regards,

    Feng