If a multi-channel BUCK IC drives different loads, can the GND output to the loads be shared?

小太阳yy

If a multi-channel BUCK IC drives different loads, can the GND output to the loads be shared? [Copy link]

If a multi-channel BUCK IC drives different loads, can the GND output to the loads be shared? Take the following circuit diagram as an example. This is a 2-channel BUCK chip that drives different loads. So my question is, is it necessary to distinguish the GND of the two strings of loads? Can they be directly connected together?

maychang

"So my question is, is it necessary to distinguish the GND of these two strings of loads? Can we just connect them together?"

These two GNDs must be connected together.

maychang

The GND of the two loads must also be connected to the GND of the input end (corresponding to the GND of VIN in the figure).

qwqwqw2088

In principle, the ground of this circuit should be connected together.

From the software drawing, the same network labels in the schematic diagram should be connected together. If the endpoints are not connected together, they need to be named separately, otherwise the schematic diagram ERC will not be detected.

chunyang

The ground in the original poster's diagram is obviously the same. If it is a different ground, different symbols must be used in the circuit diagram. Since it is the same ground, no matter how many channels there are, all the grounds must be connected together.

chunyang

If it is a completely independent output channel, a transformer must be used in the circuit structure for electrical isolation. The power supply with multi-channel independent output has this structure and must have this structure.