Hello Javier:
Thanks for the help with my prior questions.
There are three different documents that TI has published with slight variations on the connections of the Driver and the compensation coil
1.In the EVM, the DRV425-Q1 drives the shunt resistance directly with DRV2 and drives the compensation coil oppositely with DRV1 connected to COMP1; the compensation coil (COMP2) is terminated at AINN (http://www.ti.com/lit/ug/slou410a/slou410a.pdf in Figure 6)
2.The data sheet's simplified schematic has the DRV425-Q1 drives the shunt resistance directly with DRV1 and drives the compensation coil with DRV2 connected to COMP2; the compensation coil (COMP1) is terminated at AINN
3. The Bus Bar application note is a further variation but seems to follow the EVM configuration: the DRV425-Q1 connects DRV1 to COMP1 to drive the compensation coil oppositely; COMP2 is terminated at AINN. This configuration doesn't use a direct drive of the shunt resistor (http://www.ti.com/lit/ug/tiduaz4a/tiduaz4a.pdf in Figure 1)
Sorry for the verbiage... I couldn't figure out how to paste graphics. I hope I'm just misinterpreting these 3 documents and you can clarify the configuration.
I'd assume that either of the DRV outputs (1 or 2) can drive the shunt and the other output can drive the compensation coil; the coil should be terminated at the AINN input to the 4x diff amp. Is this correct? If so, this would mean that the EVM's Figure 6 is the best representation.
Thanks in advance,
Frank