Hello! I am trying to reverse engineer a motor driver and here is my design thought process so far:

1. ESP32-S3 as my MCU
2. DRV8320 Smart Gate Driver
3. CSD88599Q5DC 60V Half-Bridge NexFET™ Power Block

Where I'm currently stuck is figuring out how to power the above devices with a variable 24V/48V supply.
I need a 3.3V and a 5V supply to be available and from the buck converters that I've used before, they all require a resistor to control the step down amount from a fixed input to output. Is there anything on the market that can provide a fixed 3v3 from a variable 24/48v input?

If you notice any other issues with my design please let me know!

 

hi proto.
Check out this link.
E
https://www.amazon.co.uk/s?k=24+v+s...step+down+3.3v+modules,aps,574&ref=nb_sb_noss

 

Input voltage 24 to 48 volts.
Output voltage 3.3V How much current?
Output voltage 5V How much current? What is running on 5V.
Output ?V at ?A ( 60V Half-Bridge NexFET™ Power Block ) What voltage what current? It looks like you can directly run this from the 24 to 48V without any power supply.

 

Input voltage 24 to 48 volts.
Output voltage 3.3V How much current?
Output voltage 5V How much current? What is running on 5V.
Output ?V at ?A ( 60V Half-Bridge NexFET™ Power Block ) What voltage what current? It looks like you can directly run this from the 24 to 48V without any power supply.

The 3.3V and 5V would just be to power to the ESP32/CAN Bus transeiver. Due to my circumstances, I need my motor driver to be adaptable with a 24V supply as well as a 48V supply interchangeably. I can currently achieve this with that "maxon motor control 1-Q-EC Amplifier DEC Module 50/5"; its MCU somehow can run on a wide input voltage range without requiring me to configure any resistors when the input voltage changes.

 

since input voltage is pretty high and range is also rather wide, this should be switching regulator. something like LM76005 would do the trick: very wide input range, high efficiency... this is only needed to get stable 5V. then 3V3 can be obtained with a linear regulator.

 

since input voltage is pretty high and range is also rather wide, this should be switching regulator. something like LM76005 would do the trick: very wide input range, high efficiency... this is only needed to get stable 5V. then 3V3 can be obtained with a linear regulator.

Is that able to provide a constant 5V output with a varying 24-48V input without the need to change the feedback resistors? That's been my dilemma; finding a buck converter that can handle various inputs without the need for changing feedback resistors.

 

for 5V output, input can be anything in a very wide range such as 8-60V without any circuit changes... (input does need to be higher than output)

 

Is that able to provide a constant 5V output with a varying 24-48V input without the need to change the feedback resistors?

To clarify, the output voltage is determined by the value of the resistor from the output to the FB pin and the resistor from the FB pin to ground. The output adjusts such that the FB voltage from this potential divider is 1.0V. This will work over a wide range of of input voltage

 

I'd also go for the switching regulator. My favourite is LMR38010. Then follow with a LP2951 to give a clean 3.3V supply.

 

I need a 3.3V and a 5V supply to be available and from the buck converters that I've used before, they all require a resistor to control the step down amount from a fixed input to output. Is there anything on the market that can provide a fixed 3v3 from a variable 24/48v input?

This would be very unusual and largely defeat the purpose of using a voltage regulator of any kind. Almost all regulators strive to make the output voltage independent of the input voltage over the allowed range of input voltage. Any feedback needed is from the output back to the regulator to set the output voltage and it is not dependent on the input voltage.

If you can give a manufacturer part or model number for a buck regulator that you've used that you think is different, please provide that info and we can take a look. My guess is that you are not reading the data sheet correctly, but who knows.