TPS51650 Datasheet, PDF (41/50 Pages) Texas Instruments – Dual-Channel (3-Phase CPU/2-Phase GPU) SVID, D-CAP+™ Step-Down Controller

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TPS51650, TPS59650
SLUSAV7 – JANUARY 2012
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 53 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 (C_SENSE) 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
LL
x
V
CORE
R
SEQ
Thermistor
CSNx
CSPx
R_SERIES
UDG-11038
Figure 53. Make Kelvin Connections to the Inductor for DCR Sensing
Copyright © 2012, Texas Instruments Incorporated
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