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ADUM4135 Sat function

Hi Sir

I use the Adum4135 for IGBT in inverter application & found the P10 is too sensitive for IGBT Protect

how to adjust the R&C value as the red circle

Can I shut down the Pin 10 function which keep the IC work correct ?

thanks

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  • Hello,

    The Rblank is an optional pull-up resistor that can effectively increase the current source Cblank sees. This will increase the charge rate of the blanking capacitor. In most cases, you can leave Rblank out. The internal current source is approximately 500 µA, but if you are in a large noise environment, and want to increase Cblank's size while keeping the same detection time, adding an Rblank can achieve this. The charging current added will act like an RC circuit, but a quick estimation is to know the charge current will be increased by VDD2/Rblank when Cblank is discharged.

    If you want to disable the Desat function, the best way is to short the DESAT pin to GND2.

    RSchnell

Reply
  • Hello,

    The Rblank is an optional pull-up resistor that can effectively increase the current source Cblank sees. This will increase the charge rate of the blanking capacitor. In most cases, you can leave Rblank out. The internal current source is approximately 500 µA, but if you are in a large noise environment, and want to increase Cblank's size while keeping the same detection time, adding an Rblank can achieve this. The charging current added will act like an RC circuit, but a quick estimation is to know the charge current will be increased by VDD2/Rblank when Cblank is discharged.

    If you want to disable the Desat function, the best way is to short the DESAT pin to GND2.

    RSchnell

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