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Help with design of a pre-regulator

Diana Vertiz del Valle
Intellectual 370 points
Other Parts Discussed in Thread: DRV8701EVM

Hello, I need advice for a pre-regulator design, I don't have much experience in the field, so I'll try to explain my design.

I'm working in a modular design with nodes communicated by CAN protocol, some of the nodes are used to drive power loads like actuators.

My design includes a battery power source of 24V wich will power the actuators, I used for this the DRV8701EVM reference design, but I changed it to replace the micro-usb with an 5V input and CAN protocol.

So now in the board, I have a voltage regulator to convert 5V to 3,3V to power the microcontroller and low power electronics.

I need help to find a way to manage the power source, I need a design to get 5V from 24V battery and I don't know exactly where to start. And what about the battery? should I connect it directly to power the actuators? until now I've been using a laboratory power supply

I would appreciate any help, please help me. 

  • 0
    TI__Prodigy 400 points

    Hi Diana,

    As a good starting point, we recommend that you use our online WEBENCH Power Designer software. Using this tool, you can narrow down your search by minimum and maximum input voltage, output voltage, and output current. You can then optimize your design by configuring the specifications that are most important for your application (cost, size, efficiency, transient response, etc). 

    You can access the tool using the following link, which also provides some useful information to help you get started. Click on "Try Power Designer now" to access WEBENCH.

    https://www.ti.com/design-resources/design-tools-simulation/webench-power-designer.html

    While we have made an effort to make the tool as intuitive and easy to use as possible, please feel free to reach out for any questions about the tool, or about your design. Thank you.