Find a replacement opamp
esden opened this issue · 2 comments
esden commented
The currently used Opamp is the OPA335 from texas instruments.
Hopefully we can find something less expensive.
The requirements for the opamp are probably:
- Low offset voltage
- Speed faster then the targeted maximum PWM frequency to be able to sample the current on the phases (>30khz)
- Rail to rail
Anything else?
Can anyone help with this search?
edude03 commented
I haven't studied the design extensively to see if this would be a good fit, but based solely on the specs and cost, maybe the Analog Devices AD8538 would be a good fit?
JamesWhitlock commented
Maybe a Intersil ISL28130? It a gain product of 400kHz enough?