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.