Hi
TPS7B7702 Dual channel LDO iam using for my project. Sense voltage i want to give to ADC channel (1.8V max) ,How can i scale down the voltage from the LDO for connecting to the ADC. if i put a divider in the out put of the sense pin any other functional impact is there? Please confirm..
Can we connect like this
Hi Shiju,
The SENSE pins current is proportional to the output current of their respective channel (SENSE1 is proportional to OUT1 for example). To sample a voltage to an ADC you should connect a resistor from the SENSE pin to GND. Adding a resistor in series from the SENSE pin to the ADC may not give you the behavior you require.
Here is some information from the datasheet to generate a current sense voltage:
Regards,
Andres
Hi
Thanks for reply
As per this under short circuit condition sense voltage will go up to 2.65V. by considering this situation only i planned to scale down the voltage with resistor divider. Can u suggest any other way to scale down the sense voltage
Hi Shiju,
I see that you're trying to make sure you do not go above 1.8V during a short circuit scenario. The voltage divider would definitely work during this scenario where the SENSE pin will output voltage instead of current. However, during normal operation the SENSE pin should behave similar to a current source which might not work great there.
You could use a resistor to GND in order to get a voltage and connect this to a high impedance buffer. Then the output of the buffer could be connected to your voltage divider towards your ADC.
Regards,
Andres
