Tool/software:
We want to detect the current consumption on each output stage. This can be done through a shunt resistor connected on pins 10 and 12, then monitored through a current sense amplifier (INA190A4).
Are the VS+ pins 10, 11, 12 internally shorted together or can these can be considered separate?
Thanks very much
Hi Stephanie,
Are the VS+ pins 10, 11, 12 internally shorted together or can these can be considered separate?
The supply pins in ALM2403-Q1 are bonded together internally and it is one voltage node. In ALM2402F-Q1, these power pins and output stage drivers' pins are separate terminals.
This can be done through a shunt resistor connected on pins 10 and 12, then monitored through a current sense amplifier (INA190A4).
I need to have a bit more information.
If you can monitor and voltage the overall current across a shunt resistor resistor on the high side, circled in red.
If the customer is interested only the current to the resolver, then you will need two shunt sensor, one on each ALM2403-Q1's output stage (ALM2403-Q1 consists of dual power amplifier in a single package). One terminal is for sourcing current, and other terminal is for sinking current, and vice versa (unless you assume Isourcing = Isinking for approximation. then you can use one or 2xIsource).
https://www.ti.com/tool/ALM2403Q1EVM
You can place a shunt inside of feedback loop (recommended) or outside of feedback loop. Typically, ALM2403-Q1 has output terminal shorted to GND, output terminal shorted to battery and other fault conditions at the resolver's output. You can use the current limiting resistor as shunt to sense the output current.
If you have other questions, please let us know. I can send you the simulation, if I know what you are trying to do.
Best,
Raymond
