Other Parts Discussed in Thread: TPS62872
Background:
From TPS62872 datasheet, it is suggested that connect the COMP pins of all stacked devices together and connect a resistor and capacitor between the common COMP node and GOSNS, but has no statement show that GOSNS must be connected to GND, just a diagram showing the compensation network is connect to GND of load.
In our design as below diagram, we could see resistance inside the load for GOSNS and VOSNS.
- Resistance between output voltage to VOSNS is ~1Kohm
- Resistance between GOSNS to GND is ~1Kohm
Note: the load in this picture is a SOC and the connected two pins are two dedicated pins for remote to sense.
So the question is:
1. If GOSNS must be connected to the GND directly? if there can be a series resistor, what's the maximum impedance?
2. If the compensation circuit (from COMP) must be connected to GOSNS? or can it be connected to GND directly or it can be floating?
3. In our circuit diagram, GOSNS is connected to the GND via a 1K resistor. and the compensation network is then connected to GOSNS. So can the compensation network work normally in our design?
Thank you and look forward to the reply.
Block diagram: