[Ether]

Originally Posted by dsirovica

(BTW, you cannot use the high-side for the inductive current path as Q1's Intrinsic Diode is pointing the wrong way)

Not true.

See attachment.

To use high-side for inductive current path, switch as follows:

For positive (forward) motor current:

Q1	Q2	Q3	Q4

on			on	PWM ON

on		*		Dead Time *current flows thru Q3 diode

on		on		PWM OFF

For negative (reverse) motor current:

Q1	Q2	Q3	Q4

	on	on		PWM ON

*		on		Dead Time  *current flows thru Q1 diode

on		on		PWM OFF

This is reasonable well explained in:
http://www.ti.com/lit/ug/spmu130c/spmu130c.pdf
On Page 18 under “Motor Output Stage” and “Switching Scheme”, and shown in Figure 4-4 on Page 19.

Yes, we know. This was already mentioned in post#82
http://www.chiefdelphi.com/forums/sh...0&postcount=82