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TIDA-00281: 1Kw controller design

Part Number: TIDA-00281

Sir the 1Kw controller design(TIDA-00281) was simply super. My big appreciation for that whole team. 

I have some confusion in that design, can anyone clear it. 

- Why two power supply (12v and 48v battery) are used instead of one. By regulating 12v from 48v, we can for controllers, gate driver and even for even digital IC used there. Does any back-emf cause the controller to misbehave ? so you are using two individual supplies.

- The image given below was taken from the 1KW bldc controller design. what is the inductor that was used at the top right(750315511 39uh).

  • Hi Bud,

    Thanks for your interest in this part. I have contacted the appropriate team to help address your concern.

    Since Monday is holiday, expect to hear from the team on Tuesday/Wednesday.

    Thanks for your patience.


  • Bud b,

    I'm glad you find the design useful!

    The two power supplies are used because in an automotive environment, it is common to have a 12-V supply even when a 48-V supply is available.  The 12-V supply is typically used throughout the car for low-current applications, and for the network (CAN and/or LIN for example).  There is a large universe of existing electronics that uses the 12-V supply, such as ADAS, Infotainment, Body Electronics and Lighting that will continue to use 12-V supply.  So it is common to have the logic side of the application use the 12-V supply to communicate with the rest of the car, make initial decisions, etc.

    The inductor part number you reference for T1 is supplied by Wurth Electronics; I have attached the datasheet here for your convenience.


  • Ok sir I got it, but by using or regulating 48v for logic supply causes any problem or disadvantages.