DRV8300: How can DRV8300 supports 3xPWM?

Hey Ari,

Which variant of DRV8300 does the customer have?

Please see below from the DS:

The DRV8300 has flexibility of accepting different kind of inputs on INLx. In the devices with MODE pin (QFN package), the DRV8300 provides option of configuring the GLx outputs to be inverted or non-inverted compared to polarity of signal on INLx pins. When the MODE pin is left floating, the INLx is configured to be in non-inverting mode and GLx output is in phase with respect to INLx (see Figure 8-4), whereas when the MODE pin is connected to GVDD, GLx output is out of phase with respect to INLx (see Figure 8-5). In devices without MODE pin (TSSOP package device), there are different device option available for inverting and non inverting inputs

For more info I suggest looking into section 8.3.1.2 Mode (Inverting and non inverting INLx) of the DS.

Best,

Akshay

Hey Ari,

Were you able top take a look into the inverted mode for DRV8300 in section 8.3.1.2?

With the inverted mode you can rely on the HS and route the INHx signals to LS to be flipped. 

This is not a true 3x mode as seen in our other devices as you wont have a hi-z state, but you will be able to use the three HS signals to do your commutation.

Best,

Akshay

Hey Ari,

Yes, this is what I meant by :

Akshay Rajeev Menon said:

With the inverted mode you can rely on the HS and route the INHx signals to LS to be flipped. 

This is not a true 3x mode due to reasons I mentioned in my last post. but would only require INHx signals being duplicated and flipped and being offset to prevent shoot through.

Best,

Akshay