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eigenbau:bipolar_current_driver:start [2021/10/29 14:04] – created mquensen | eigenbau:bipolar_current_driver:start [2021/10/29 14:09] (current) – [Issue list] mquensen | ||
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==== Schematic and layout ==== | ==== Schematic and layout ==== | ||
- | A OPA549 gives out some current that is send through some device (e.g. a coil) and finally a reference resistor. The voltage drop there is measured with an instrumentation amplifier. At an OPamp in PI-controller circuit | + | A OPA549 gives out some current that is send through some device (e.g. a coil) and finally a reference resistor. The voltage drop there is measured with an instrumentation amplifier. At an OPamp in PI-controller circuit |
+ | |||
+ | The OPA549 features a logic signal to shut it down, and a pin for setting a current limit. Both functions are implemented. | ||
The layout is designed as two boards. One for the control (reference resistor, PI OPamp, instr. amps ...) and the other for the OPA549. | The layout is designed as two boards. One for the control (reference resistor, PI OPamp, instr. amps ...) and the other for the OPA549. | ||
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* There are too many pads for the output current. Not needed. | * There are too many pads for the output current. Not needed. | ||
* The PI-controller OPamp has a pin distribution that does not fit to its footprint, I think. | * The PI-controller OPamp has a pin distribution that does not fit to its footprint, I think. | ||
+ | * There is no option to discharge the Elko's in the OPA549 board. They remain charged for quite some time after turning off the power supply. | ||