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TPS40210: 40A OCP application

Mike Yu
Intellectual 2320 points
Part Number: TPS40210
Other Parts Discussed in Thread: LM5155, LM5060

Hi Team,

The customer wants to use TPS40210 to implement Vin = 20V, Vout = 24V and Iout = 3.5A design.

However, according to their application, the OCP point is 40A. Can this device support 40A OCP? How should we set the Rshunt value? Thank you.

Best regards,

Mike

  • 0
    TI__Mastermind 21720 points

    Hi Mike,

    Thanks for reaching out with your question and for considering the TPS40210.

    Since the TPS40210 is a controller there is no issue from the IC that would limit the output current. The power components (MOSFET, Inductor,, diode) will need to sized to handle this.

    Is the 40A just a quick peak current? Or is this a sustained current over a long period of time? Does the application require hiccup mode peak current limit detection?

    Another device to consider is the LM5155 which is the updated version of the TPS40210.

    Thanks,

    Garrett

  • 0 in reply to Garrett Roecker
    TI__Intellectual 2320 points

    Hi Garrett,

    40A is just a inrush peak current, it is the test item of Hot-plug as below.

    If I set the OCP to 40A, the value of current shunt will be very low. However, the system working the output current is only 3.5A, the voltage of pin7(ISNS) will also be low. Did the ISNS has the lowest tigger voltage? I am worry about that ISNS is too low, so there will be no PWM signal.

    Best regards,

    Mike

  • 0 in reply to Mike Yu
    TI__Mastermind 21720 points

    Hi Mike,

    The TPS40210 cannot control the initial inrush current to the output capacitor when the input voltage is initially applied. The diode in the power drain will conduct and the inrush current is based on the resistance from input to output. If you need to control the inrush current then a device similar to the LM5060 should be used.

    The current sense resistor should be selected to accommodate the normal operating peak current, not the inrush current.

    Thanks,

    Garrett