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Is there any method to use 5V at TMS570LC4357 or RM57L843 Development Kit ?

Sanghoon Lee12
Prodigy 235 points
Other Parts Discussed in Thread: TMS570LC4357, LM317, DRV8833

Hello, I have serious problem at my TMS570LC4357 Development Kit.

Is there any method to use 5V System ?

I try to use OC(Open Collector) Circuit to use 5V System.

But, there are very big problem.

When I use it to ESC then it doesn't work.

So, I use some trick to use arduino 5V supply and GND with TMS570LC4357 PWM Signal Wire.

Then some System(maybe weak current or voltage system) can work with it.

(But Waveform is not so good)

However when I use below ESC and BLDC Motor then it doesn't work.

So I check it with Oscilloscope, then I can see below waveform

1. This is Arduino VCC, GND, and PWM Signal(It works)

2. This is Arduino VCC, GND and MCU PWM Signal(Some works or doesn't works)

3. This is Arduino VCC and MCU GND, PWM Signal.(Never Work)

First case makes almost 4V.

Second case makes almost 3.4V ~ 3.8V with noise.

Third case makes 2.9V and it display to me RC Circuit Charging Waveform.

Is there any method to use 5V System ?

Can I use Board's EXP 12V to 5V ?

Is it OK to convert 12V to 5V 200mA ?