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LM9061: Delay

Tommy Mao
Prodigy 70 points
Part Number: LM9061
Other Parts Discussed in Thread: TPS4811-Q1

Hi experts，

Is the time for LM9061 input rising edge to switch conduction this Ton 1.5 ms? (Delay = 1.5ms?)

Why delay is so high? (ADI's high side driver LTC4440 takes about 50ns, customers expect us to be close to their level)

  

Are there other low-delay high-side driver recommendations? (Ericsson want delay<300ns )

 

Is it feasible to just use high-side of half bridge driver?

Thank you!

Best regards,

Tommy Mao 

  • 0
    TI__Guru** 101911 points

    Hi Tommy,

    TPS4811-Q1 is the best fit from our portfolio. Why the delay is important ? Are they going to use for switching applications. ?

    Best Regards,

    Rakesh

  • 0 in reply to Rakesh
    TI__Prodigy 70 points

    Hi Rakesh,

    Thanks for your reply!

    Ericsson need high side driver for follow situation: （The voltage switching time needs to be less than 2us，so driver delay is important）

    What is the propagation delay of TPS4811-Q1 when CL=3.83nF?


    The switch used by the customer is BSC110N15NS5. Its CL = Qg/12 = 46/12 = 3.83nF

    Compared to ADI's LTC4440, TPS4811's charge pump function is recognized by customers because does not require additional external power supply, but the large delay is a concern for customers. 


    The customer will make a decision within two days, and due to delays, they are currently leaning towards the ADI solution.

    Thank you for your quick response.

    Best regards,

    Tommy Mao 

    Field Application Engineer Intern| TI Semi Beijing Branch

  • 0 in reply to Tommy Mao
    TI__Guru** 101911 points

    Hi Tommy,

    Thanks for the additional information. As we are following up on email, I am closing the thread here.

    Best Regards,

    Rakesh