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TPS25946: Inrush and dv/dt SPEC introduce.

Yuxi Liu(Tony)
Expert 3070 points
Part Number: TPS25946

Tool/software:

Hi TIer

Currently we are promote our TPS25946 to customer, I see the Inrush capability in datasheet is depends on different application condition.

So How can I describe our SPEC to customer in quantitative analysis?

For example, customer usually ask:

1. The maximum voltage that the module can withstand when started?

2. The maximum voltage change slope that the module can withstand and the maximum current change slope .

3. And what other key parameters highlight our strengths? 

Thank you very much.

  • 0
    TI__Mastermind 38435 points

    Hi Yuxi,

    The amount of inrush that the device will see will depend on the output cap and the dvdt cap. So we can adjust the device output slew rate to get lower inrush current. 

    When the inrush current is high, the power dissipation will also become high and device can enter thermal shutdown to prevent any permanent damage.

    Yuxi Liu(Tony) said:
    1. The maximum voltage that the module can withstand when started?

    The device can be ramped up with maximum application voltage (should be below the recommended max of device). Depending on the load type, dvdt cap needs to be adjusted.

    Yuxi Liu(Tony) said:
    2. The maximum voltage change slope that the module can withstand and the maximum current change slope .

    We have a design calculator in product folder using which we can calculate the fastest slew rate (maximum inrush current) the device will be able to support.

    Yuxi Liu(Tony) said:
    3. And what other key parameters highlight our strengths? 

    You can highlight that device provides an integrated solution which ensures SOA on its own using various protection mechanism like current limit, thermal shutdown, OVP, UVP, and also provide some indication like PG, etc. 

    One application where the device will have hard time in startup is when the output cap is large and load current is also large.

    Best Regards,
    Arush