TPS51640A, TPS59640, TPS59641
SLUSAQ2 –JANUARY 2012
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Given the physical layout of most systems, the current feedback (xCSPx, xCSNx) may have to pass near the
power chain. Clean current feedback is required for good load-line, current sharing, and current limiting
performance of these devices, so please take the following precautions:
•
Make a Kelvin connection to the pads of the resistor or inductor used for current sensing. See Figure 72 for a
layout example.
•
•
•
•
Run the current feedback signals as a differential pair to the device.
Run the lines in a quiet layer. Isolate them from noisy signals by a voltage or ground plane.
Put the compensation capacitor for DCR sensing (CSENSE) as close to the CS pins as possible.
Place any noise filtering capacitors directly underneath these devices and connect to the CS pins with the
shortest trace length possible.
Noisy
Quiet
Inductor
Outline
LLx
VCORE
CSNx
CSPx
R
SEQ
R
SERIES
Thermistor
UDG-11038
Figure 72. Make Kelvin Connections to the Inductor for DCR Sensing
44
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