User Manual
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V 1.0
2021-08-25
XDPP1100 technical reference manual
Digital power controller
Voltage sense
2
Voltage sense
This chapter describes the VS module and its submodules, voltage sense ADC (VSADC) and voltage sense
processor (VSP) in detail. In addition, the user-programmable settings for configuring the features of the sensed
voltages are described and relevant registers provided.
The XDPP1100 controller has three following analog input pin pairs for voltage sensing:
•
VSEN/VREF, for V
OUT
sensing
•
VRSEN/VRREF, for V
RECT
sensing or primary-side V
IN
sensing
•
BVSEN_BVRSEN/BVREF_BVRREF, for V
OUT
sensing in dual-loop operation or V
RECT
sensing for interleaved
topology
Typical connection of VSEN/VREF and VRSEN/VRREF in a FB converter with CT rectifier for V
OUT
and V
RECT
sensing
is shown in
, where the sensed voltage connections are illustrated in red. Both voltages are sensed
through a resistive divider, which introduces gain and needs to be considered in the computations, as will be
discussed further.
Figure 2
V
OUT
and V
RECT
sensing in FBCT converter with VMC
Q
1
Q
2
L
lk
Aux supply:
controller V
DD
primary-side drive
secondary-side drive
PW
M
6
Q
4
Q
3
VD
12
V
D
D
PR
IS
EN
PWRGD
PW
M
3
PW
M
1
PW
M
4
SYNC
TS
EN
PW
M
2
SDA
SCL
EN
XA
DD
R1
SMBALERT#
IM
ON
To System
PW
M
5
VREF
VRREF
VRSEN
ISEN
IREF
VSEN
V
IN
Driver
Driver
V
IN
S
2
+
V
OUT
-
L
OUT
C
OUT
Driver
Copper
L
m
NTC
V
RECT
