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Part Number: OPA2350
Hi , i'am using drv8412 reference design rev.g -> dual dc or step motor driver / below is the link
When i test about this evm , i wondered about current sensing of motor
i attatch the schematic.
I know IA-FB ~ ID-FB is current feedbacks used by OPA2350EA
below, i have a some question Pleas, reply so detail as you as possible
1. How to Calculate about realtime Current?(Please example calculation Ex, Busvoltage24V and sample current 4amphear ) and what is the OPA2350 Gain? and DC Bias 2.5V voltage?
2. I dont understand R26/R54/R35/R30/R64 work? how to use that for make to gain? or DC Bias? did it work inverting amp? calculate please(i think that chips operate as Low side motor current sensig)
I don't good at making english sentences , please Reply THankyou!
For DC gain, neglect all of the capacitors and only consider resistor values. Here is example how to do it for top op amp configuration:
The real time current will be a function of frequency and thus will vary. Thus, the best way is to measure the current or gain is to use one of the simulators like Tina-TI - follow the link for free download:
I have also attached Tina-TI schematic - see below.
Marek Lis, MGTSSr Application EngineerPrecision Analog - TI Tucson
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