Datasheet

C
TPS51219
SW
DH
V5
DL
PGND
GND
BST
5V
GND
VSNS
GSNS
C
R
VIAs to inner
ground layer
C
COMP
C
TPS51219
SW
DH
V5
DL
PGND
GND
BST
5V
GND
VSNS
GSNS
C
R
VIAs to inner
ground layer
COMP
C
C
R
To output bulk
capacitance
TPS51219
www.ti.com SLUSAG1B –MARCH 2011– REVISED OCTOBER 2011
• Connect VSNS directly to the output voltage sense point at the load device. Connect GSNS to ground return
points at the load device. Insert a 10-Ω, 1-nF, R-C filter between the sense point and the VSNS pin where the
COMP capacitance is connected as shown in Case 1 (Figure 31). When the COMP pin capacitance is
connected to output bulk capacitance, connect the R-C filter in series to both the VSNS pin and the COMP
capacitance as shown in Case 2 (Figure 32).
Figure 31. Case 1: COMP Pin Capacitance Connected to VSNS
Figure 32. Case 2: COMP Pin Capacitance Connected to Output Bulk Capacitance
• Connect the overcurrent setting resistors from TRIP pin to ground and make the connections as close as
possible to the device. The trace from TRIP pin to resistor and from resistor to ground should avoid coupling
to a high-voltage switching node.
• Connect the frequency and mode setting resistor from MODE pin to ground, and make the connections as
close as possible to the device. The trace from the MODE pin to the resistor and from the resistor to ground
should avoid coupling to a high-voltage switching node.
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