50KHz PWM base motor driver

[hpcycling2010]

Can anyone help me create a circuit for the following?
I have a 46.9KHz PWM, 50% duty cycle, 3.3V signal and a "phase" or direction signal.

I am trying to drive a 24V DC motor, stall current of 20Amps.
I would purchase an H bridge off the shelf, but most of them are 25KHz max.

I found this driver which does the frequency and voltage, but not the current (2.8A max)
https://www.electro-tech-online.com/custompdfs/2012/12/drv8801.pdf

Any help will be appreciated. Thank you

 

[KeepItSimpleStupid]

Take a look here: **broken link removed** and in this site in general. Somewhere it said use a PWM signal > 20 kHz.

 

[hpcycling2010]

That looks legit. The only thing that doesn't seem like it would work is that 3.3V is not preferred (it expects 0-5V for a 0-100% control, so I would be losing the 3.3-5V power range).
Could I use a simple transistor to jump the PWM pulse to 5V? What type would I use for that?

 

[KeepItSimpleStupid]

Something like this https://www.electro-tech-online.com/custompdfs/2012/12/CD00000437.pdf as a buffer, 5V supply, all unused inputs tied to Vcc or ground.

Note that the suggested motor driver has Different PWM frequencies in and out. Input is essentially duty cycle.

I wouldn't go grabbing the motor driver though, because it does not look like the measured current is separately available.

If I'm not mistaken, you also need to scale the current of the new motor to the controller. i.e. A measured 20 A means 5A to the OEM controller. You might be able to get away using an Allegro hall effect sensor to measure bidirectional current, but then you would effectively need a bidirectional voltage to current controller. i=e.g. +-5 V gets turned into +-5A at the old voltage. Go to www.digikey.com and search for allegro hall effect sensors.

https://www.apexanalog.com/ makes a lot of high voltage/high power op amps, but they are extremely pricy. Dual power OP amps are available for use in bridge configurations. A single supply does bidirectional control.