Other Parts Discussed in Thread: OPA521, OPA2673
Hi there, we used two OPA564 configured as improved howland current source, to drive two step motor coils (8.5ohm + 4.1mH), and we hope to find replacement for cost down in next HW version.Current version SCH and some key info is below (OPA564 on third page).
Input sine wave is 500HZ or less, with amplitude 2V or so (can be conditioned).
Power consumption is not a big concern, I_output should be >500mA to drive the motor coil, drive power Vs = +/-10V, and I searched in TI website, found possible candidate : OPA521 or OPA2673, which are cheaper but claimed to be used in PLC application, so I am not very sure if they are applicable.
Or D-Class amplifier which can drive coil might be usable.
Hope TI experts could help recommend some devices. Thanks.