INA180: INA180A3IDBVR

Shachar Armon

Prodigy 230 points

Part Number: INA180

Tool/software:

Hi There,

We are using INA180A3IDBVR for battery charge and discharge current measurements,

the application is battery powered and we need to have low current consumption state.

The battery always connected to the PCB,

and we planed to disconnect the current amplifier VS power and just to power it for short time for measuring.

So, we have state which we do have potential on the Amplifier inputs (IN- & IN+), which is up to 12.6V and down to 7.5V,

But no VS power.

we measured parasitic voltage (around 2V) on the VS pin.

My question are:

1. is it forbidding and can cause permanent damage to the Amplifier?

2. what will be the Amplifier quiescent current under this conditions?

Shachar

over 1 year ago

0 Peter Iliya over 1 year ago

TI__Mastermind 32395 points

Hey Shachar,

I am looking this over and will respond shortly.

Best,

Peter

0 Peter Iliya over 1 year ago in reply to Peter Iliya

TI__Mastermind 32395 points

Hey Appreciated Engineer,

Please excuse the delay.

1. No this will no cause any damage. There can be voltage at input pins with floating VS this is fine.

2. Amplifier's should have no current going into VS if it is floating. Although there will be current going into device input pins (IN+ and IN-), see Figure 7-20 of datasheet.

Also I will recommend that you put the following resistor on your schematic. This will help keep Vs stable during the toggling of power and remove risk of latch up.

Sincerely,

Peter

Amplifiers

Amplifiers forum

INA180: INA180A3IDBVR