Yes I understood your assertion. What I don't know is how you determined the current wasn't enough. While checking with a power supply is helpful, how did that show the current from the sensor was the problem? It shows that something about the sensor is not working with the converter, but how did you work out it was the current?

The only chance is the lack of current from the sensor. If not what could be the possible reason

 

The only chance is the lack of current from the sensor. If not what could be the possible reason

Well, I don’t know. Did you confirm this somehow, or did you assume that everything else was being held constant?

Did you measure the current from the sensor?

I am not there, but as I said, you probably don’t need any help working out how to use an o-amp as a current amplifier, or if you do, start and when you have questions, ask those.

 

hi shibin,
This simple circuit is based on the information you have posted, check it out.
E

 

Why aren't you feeding the output of the sensor directly to the input (pin 6) of the V-to-I converter IC, instead of loading it down with all those resistors?

 

Why aren't you feeding the output of the sensor directly to the input (pin 6) of the V-to-I converter IC, instead of loading it down with all those resistors?

Hi alec,
Is that for me to read.?
If so they are just dummy values to show the current plot.
E

 

Take a look at the design of the sensor circuit.
In uses a TLC555 timer circuit to generate a 3V PWM digital signal.
Remove C3 and short across D1. Just measure the PWM signal directly from the 555-timer output using a timer module on your MCU.

 

Hi alec,
Is that for me to read.?

Sorry for the confusion Eric. My post (#24) was aimed at the TS.

OK.

 

Thank you guys.
Solved the issue.

 

hi shibin,
Pleased to hear that, which OPA did you use.?
E

 

hi shibin,
Pleased to hear that, which OPA did you use.?
E

Hi,
Just like Yaakov said, it is not a problem with the output current of the sensor, but it was a mistake from the reference diagram given by TI.
A 1K Resistor was grounded there. We just removed that