10.3 Current Sensing Lines
Given the physical layout of most systems, the current feedback (CSPx and CSNx) may have to pass near the power chain. Clean current feedback is required for good load-line, current sharing, and current limiting performance of the TPS59632-Q1 device, so take the following precautions:
- Ensure all vias in the CSPx and CSNx traces are isolated from all other signals.
- TI recommends dotted signal traces be run in internal planes.
- If possible, change the name of the CSNx trace if possible to prevent automatic ties to the VCORE plane.
- Run CSPx and CSNx as a differential pair in a quiet layer to the device.
- Isolate the lines from noisy signals by a voltage or ground plane.
- Make a Kelvin connection to the pads of the resistor used for current sensing.
- Place any noise filtering capacitors directly under or near the TPS59632-Q1 device and connect to the CS pins with the shortest trace length possible.