Other Parts Discussed in Thread: AMC1351
Tool/software:
Dear TI
I am an engineer developing inverter converter system from several kW to several tens of kW. And I am designing bipolar signal sensing and unipolar signal sensing circuits in high-voltage isolation interface using TI's amc1350/amc1351 isolation amplifier semiconductor solutions.
I think AMC135X products are a good solution for isolation voltage. However, since TI C2000 products are used, it is always difficult to apply differential signal interface. Differential signal interface design method requires more stringent design conditions during PCB design because it uses many signal lines. Especially, when connecting cables to connectors, there is a physical limitation that the number of cables increases.
I suggest that TI should develop OPAMPs for AMC135X interface for at least two cases. I know that TI provides design data using small circuits using some resistors, capacitors, and OPAMPs. However, I do not think that even if it is a small circuit, it consumes a certain area and there are many OPAMP products to choose from.
For signal control circuits, 3.3V power supply is sufficient, but in the power circuit design field like mine, considering the noise caused by the external environment, I suggest that external signal expansion should be designed based on at least 5V~12V power supply. At least, a single semiconductor solution for differential-ended and single-ended interfaces that operate on a single power supply is very necessary.
And I develop power devices used in electric vehicles. When I review large-scale controller structures such as ST, NXP, and Infineon, I think that the analog conversion channels in vehicle controllers will expand to 40~100ch. Therefore, considering the design direction where multiple systems are increasingly integrated or complex, the number of isolated analog channels will increase, and simplification of analog conversion circuits and [factory level precision fine tuning one-chip-solution] will be required.
I think that TI's AMC135X development team assumes that the isolation amplifier has a short distance from the controller such as C2000 and a small number of channels. I would like to explain that many high-speed, medium-speed, and low-speed ADC channels, as well as many isolated channels, are required.
*High speed ADC ac/dc current /voltage for freq control , Critical Fault
*Medium speed ADC ac/dc current/voltage for duty control , Medium Analysis and Safety
*Low speed ADC temp, ac/dc current/voltage/in out , Low Analysis and Safety
Best regards, Choi
