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THVD2442: Z pin pull-up waveform delay issue

Chu Allen
Intellectual 790 points
Part Number: THVD2442

Tool/software:

Hi Teams,

The D pin of THVD2442 is always at a low level, the DE pin is a square wave signal, and the output of the Z pin switches between a low level and a high impedance state.

When the Z pin is in a high impedance state, it will be pulled up to 12V.

The diagram is as follows。

In actual use, there is a fixed time voltage of over 100 microseconds on the Z pin, which is 4.5V and cannot be pulled up.

Please help analyze the reason.Thanks.

  • 0
    TI__Guru 74252 points

    Chu,

    Thank you for posting on E2E. Your thread has been assigned to the appropriate engineer. Please note that Friday, 04/18/2025, is a company holiday at TI Dallas, so answers will be delayed.

    Regards,

    Eric Hackett 

  • 0
    TI__Guru 72751 points

    Hi Chu,

    My guess is that when the DE pin is high, the PFET of the driver on Z is actively driving the level to be close to 4.5V. When DE is low, the PFET is disabled and the signal can rise to 12V (RC constant). 

    You probably need to put the DE pin on the same scope as the Z signal. I would also suggest scoping the D pin to ensure it is not change states. 

    -Bobby