Not Recommended for New Designs
General Specifications
Overview of Adaptive Loop Compensation
Adaptive Loop compensation, illustrated in Figure 1, contributes to the
bandwidth and speed advantage of Factorized Power. The PRM ?
monitors its output current and automatically adjusts its output voltage
to compensate for the voltage drop in the output resistance of the
VTM ? . R OS sets the desired value of the VTM output voltage, Vout; R CD
is set to a value that compensates for the output resistance of the VTM
(which, ideally, is located at the point of load). For more information
on configuring a PRM & VTM pair for adaptive loop, please see
AN:024 “Accurate Point of Load Voltage Regulation Using Simple
Adaptive Loop Feedback.”
P048F048T12AL
The VI Chip’s bi-directional VC port :
1. Provides a wake up signal from the PRM to the VTM that
synchronizes the rise of the VTM output voltage to that of the PRM.
2. Provides feedback from the VTM to the PRM to enable the PRM to
compensate for the voltage drop in VTM output resistance, R O .
VC
V H
0.01 μF
P C
T M
S C
S G
Factorized
+In
+Out
VTM
10 k Ω
I L
N C
P R
PRM ? -AL
Module
+I n +O u t
O S
N C
C D
R OS
R CD
Bus (V F )
0.4 μH
TM
VC
PC
+Out
?
Module
– Out
L
O
A
V IN
–I n
–O u t
10 Ω
– In
K
Ro
– Out
D
Figure 1 — With Adaptive Loop control, the output of the VTM is regulated over the load current range with only a single interconnect between the PRM and
VTM and without the need for isolation in the feedback path.
PRM ? Regulator
Page 2 of 14
Rev 3.1
12/2013
vicorpower.com
800 735.6200
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