#adum6132 #gatedriver #inputcapacitance #200pf

Hello, I am using 6132 gate driver for the first time. I have a question about this gate driver application.

In the datasheet, It says gate driver is capable of driving loads typically of 200pf. I need to know max. load input capacitance value that this gate driver can drive effectively. The reason I am asking this question is that the current buffer circuit I use has input capacitance of 1000pf. I need to make sure that this gate driver is capable of driving that much of a load.

Thank you in advance,

Alper

Parents
  • Alper

    The ADuM6132 is specified with 200pF load and output current peaks of 200mA.  This means the output rise time would be dt = C*dV/I = 200pF*15V/0.2A = 15ns.  For a 1000pF load, the output rise time could be about 5 times this or 75ns.  If this is acceptable for your application, then you could use the ADuM6132.

    By the way, we also have the ADuM5230, which can be used as an isolated half bridge gate driver and has a wider operating range to 105C, while the ADuM6132 operates to a max of only 85C because it runs hot.  I would recommend the use of the ADuM5230 for less power dissipation.

    Regards, Brian

  • Brian,

    Thank you for your response. This part is clear to me at the moment.

    I have checked ADUM5230. It does not provide enough of output currents, either. So, I am looking at ADUM3220 with 4A output current capability. I have read your paper about it. The issue is that my duty cycle varies where It reaches changes of 900 kHz sometimes. Do you think ADUM3220, which has 1Mhz data rate, can handle this frequency rate?

    Furthermore, do you think shoot-through protection of ADUM3220 IC will prevent two output mosfets being on at the same time for non-constant duty cycle? As I said above, this duty cycle turn on/off rate can be as high as 900kHz as time goes on.

    Alper

Reply
  • Brian,

    Thank you for your response. This part is clear to me at the moment.

    I have checked ADUM5230. It does not provide enough of output currents, either. So, I am looking at ADUM3220 with 4A output current capability. I have read your paper about it. The issue is that my duty cycle varies where It reaches changes of 900 kHz sometimes. Do you think ADUM3220, which has 1Mhz data rate, can handle this frequency rate?

    Furthermore, do you think shoot-through protection of ADUM3220 IC will prevent two output mosfets being on at the same time for non-constant duty cycle? As I said above, this duty cycle turn on/off rate can be as high as 900kHz as time goes on.

    Alper

Children
No Data