Datasheet

1
2
3
4
CLK
CNTL
PG
SYNC
TPS40400
5
6
7
8
9
10
PAD
TRACK
SGND
U1
11
12
24
23
22
21
20
19
18
17
16
15
14
13
COMP
FB
DIFFO
VSNS+
VSNS-
ISNS-
ISNS+ BP3
BP6
GND
LDRV
SW
BOOT
HDRV
VDD
ADDR0
ADDR1
SMBALT
DATA
Rs1
Rs2
R1
R3
C3
C1
C2
Rbias
R2
LOAD
+SENSE
-SENSE
VOUT
PGND
TPS40400
www.ti.com SLUS930B –APRIL 2011– REVISED OCTOBER 2011
Remote Sensing
Remote sensing can be accomplished with the differential amplifier as shown in Figure 22. Resistors RS1 and
RS2 (R7 and R18 in the schematic above) are used if the sense connections fail or get damaged. The values of
RS1 and RS2 are bound by an upper value such that the voltage drop across them does not introduce
appreciable voltage regulation error from the bias current, and a lower value such that the voltage drop in the
load wires which appears across these resistors does not dissipate appreciable power. Values between 10 Ω to
50 Ω are usually chosen.
Figure 22. Remote Sense Schematic
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