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Original question:

ISO5851: ISO5851 DESAT malfunction

ISO5851: Fig. 6 of sllu218 "ISO5851 Evaluation Module" User's Guide related question,

yenwu lo
Prodigy 160 points
Part Number: ISO5851

Tool/software:

Fig. 6 of sllu218 "ISO5851 Evaluation Module" User's Guide (see below) did not explain how the DESAT waveforms are generated in this ISO5851 Evaluation Board & how it is implemented,

The related original detailed test procedures must have been kept in the related test report,   

not sure if related DESAT related test component & schematic & steps can be shared with me, so we can know how it is implemented exactly to get the related Fig. 6 waveform?

this kind of information will be able to help customers who use this ISO5851 evaluation board to follow to do the related DESAT testing.

Thank you and look forward to hearing from TI when convenient. 

yenwu lo

  • 0
    TI__Prodigy 180 points

    Hello Yenwu,

    I would recommend taking a look at the following application note: Choosing Appropriate Protection Approach for IGBT and SiC Power Modules. Section 5 contains more information about DESAT Circuitry design.

    I hope this helps.

    Best regards,

    Muiz.

  • 0 in reply to Muiz Ishola
    Prodigy 160 points

    Thank you, Muiz, I am not asking about how to design this DESAT circuit, 

    I am asking about how the related waveform in FIG 6 is generated in the test bench using this physical evaluation board, for example, what equipment & steps performed which are used & executed to generate the related waveforms, is there inductor (how many Henries if used?) used in the physical test bench when doing this related DESAT test? the detailed steps to generate this waveform?

    Thank you & look forward to hearing from you when convenient. 

    yenwu lo

  • 0 in reply to yenwu lo
    TI__Prodigy 180 points

    Hello Yenwu,

    The waveforms in the user guide were captured using only the EVM. There were no additional components added.

    The figures contained in the User Guide are example measurements using the EVM. The instructions for capturing the signals, along with the schematic, are provided within the User Guide. In this case, Figures 6 & 7 state in the caption, "IN+ is set to 5-VDC, and an 10-µs pulse is applied to RST" and Figure 5 shows the VCC2 & VEE2 values.

    I hope this helps.

    Best regards,

    Muiz Ishola.

  • 0 in reply to Muiz Ishola
    Prodigy 160 points

    Thank you, Muiz, I can read the captions associated with the FIG 6 without any questions, I understand also the FIG. 6 waveform are generated using the EVM board, 

    My question is, what the person who did this related test in the EVM board, actually did in the testing, so he is able to make the blue Dasat waveform to rise and then eventually trig the DESAT protection function as shown in FIG. 6 related waveform,

    This is because these steps, related setups & extra parts used to generate FIG. 6 related waveforms are not explained at all in the User Guide, I think it will be difficult for people who uses this EVM board to actually know & nothing to follow to generate those waveforms as shown in FIG. 6, 

    so, not sure if TI can share with customers the related information on how to perform the exact test steps to generate the FIG. 6 related waveforms.

    Look forward to hearing from you when convenient.

    Thank you.

    yenwu lo