• ADUM4221 dead time


    Is it possible to disable dead time in ADuM4221?

    For example, UCC21521DW is disabled by DT connection with power.

    Couldn't find exact information in the datasheet. Please help

    Best Regards,


  • adum4221

    how to disable overlap protection in adum4221

  • ADUM4221 Power dissipation

    Hi , 

    Could you tell me this is the calculation for Power dissipation? Datasheet the calculation is not clear. 

    Data sheet states : 


    Should it be 


  • ADum4221 Truth-Table Problem


    I'm using the ADuM4221 as a gate-drive for a synchronous buck converter. It's implemented according to the bootsrapped Half Bridge Operation Circuit found in Figure 38 in its datasheet (ADuM4221/ADuM4221-1/ADuM4221-2 (Rev. B) (analog.com…

  • ADUM4221 LTspice model request.


    Can`t find ADUM4221 LTspice model on product page.
    Only IBIS available.

    -- Regards,


  • RE: ADUM4221 isolation between high side output and low side output

    Hi RSchnell 

    I have another question about this.

    If there is no contamination, how much absolute voltage does the device itself have?
    I don't know the coordinates of Die in the device and I don't know how much withstand voltage it has, but can it be used…

  • ADUM4221 testing issue


            We directly replace UCC21540 to ADUM4221 as below schematics. We remove DT pin decoupling cap. The application is server power. Bit while test, the server power will boot normally at no load. But have over 0.2A load, ADUM4221 will shutdown the…

  • ADUM4221 - High-Side isolation to GND and maximum Dutycycle


    I want to use the ADUM4221 to control a H-Bridge with V_Bus = 110 V and V_DDB = 15 V with bootstrapping circuit as in the attached incomplete schematic.

    Now I am not sure if the voltage of V_DDA = 125 V refer to GND_SEC is ok, because you write in…

  • RE: ADuM4221 VDD1 series 1.2KΩ resistance


    As pictured, the 1.2 kΩ resistance will be in the way of the decoupling capacitance, meaning that as the part needs more current, the 5 V supply will droop going into the ADuM4221. It is possible to put a resistor to the left of the decoupling…

  • RE: ADUM4221 DT Pin decoupling Cap


    The ADuM4221 cannot have any decoupling capacitance on the DT pin. It is designed to not need it, and capacitance will affect the DT operation.