UCC29002: UCC29002/UCC39002 SNS- connection

Hello Arunava,

You did not attach a diagram but I can tell you that you can connect the SNS- (remote sense return) to VOUT- (power return) of the power supply.
If you decide to do this, not use the Kelvin remote sense of the power supply it will affect the accuracy of your voltage sensing but it is still possible to share current between modules

Regards

John

Hello John,

Thank you for your response.

Please refer to the attached image how I am intending to use this device.  UCC29002 GND is connected to VOUT-.

Can you confirm is it OK.

Hi Hi Hi John,

The diagram what is not the actual representation of the scheme we are using.

We don't have any SNS- connection from the load so we are connecting the ground of the UCC29002 to the VOUT-.

CS+ and CS- will see the drop across the Rshunt and current information is fed back to input of the differential amplifier.

Regards

Arunava

Please see the attached diagram .

Hi John,

Any comment on the circuit and operation of the load share controller.

We don't have SNS- connection so we are connecting GND of UCC29002 to Vout -. Similar to the attached diagram on my previous post.

Please provide feedback.

Regards

Arunava

Hi John,

How to disable the UC29002 in Rshunt in low side. In the datasheet it is only shown for Rshunt connected in high side. For enable disable function CS- pin should be 0.5V above CS+. In our case CS- is GND and maximum -ve voltage on CS- is -0.3V.

Hi John,

Can you advice any method to pull CS- higher than CS+ without affecting the measurement of the current sense circuitry.

Regards

Arunava

Hi John,

I have seen this high side sensing and disabling feature.

But we are not using high side sensing . Currently our design is based on  low side sensing and this is due to the limitation in the maximum operating voltage of this device.
I would like to know is there any way we use low side sensing and use the disabling feature.

Regards

Arunava

Hi John,

For low side sensing TI doesn't have any recommendation. And this device cant be used with low side sensing and using the disabling feature.

Is this statement is correct.

Regards

Arunava