PRELIMINARY
V•I Chip Pre-Regulator Module
General Specifications
Part Numbering
P
048
F
048
T
24
AL
Configuration
(Fig.21)
Product Grade Temperatures (°C)
AL = Adaptive Loop
Pre-Regulator
Module
Input Voltage
Designator
Nominal
Factorized Bus
Voltage
Output Power
Designator
(=Pf /10)
Grade
Storage Operating
-40 to150 -40 to125
-65 to150 -55 to125
T
M
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. ROS sets the desired value of the VTM
output voltage, Vout; RCD is set to a value that compensates for
the output resistance of the VTM (which, ideally, is located at the
point of load). For selection of ROS and RCD, refer to Table 1 below
or Page 9.
The V•I 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, RO.
Vo = VL 1.0%
VH
SC
SG
OS
NC
VC
PC
TM
IL
+Out
+In
Factorized
Bus (Vf)
ROS
RCD
L
O
A
D
NC
-Out
PR PRM-AL CD
TM
VC
PC
VTM
+In
+Out
+Out
-Out
(
)
VL
K
Io•Ro
K
Vin
Vf =
+
K
Ro
-In
–In
–Out
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.
Desired Load Voltage (Vdc)
VTM P/N(1)
Max VTM Output Current (A)(2)
ROS (kΩ)(3)
3.57
2.94
2.37
2.61
2.37
2.89
2.87
2.86
2.37
2.49
2.37
2.74
3.16
2.37
RCD (Ω)(3)
26.1
32.4
39.2
35.7
39.2
32.6
33.2
32.9
39.2
37.4
39.2
35.7
30.1
39.2
1.0
V048F015T100
V048F015T100
V048F015T100
V048F020T080
V048F020T080
V040F033T060
V048F060T040
V048F120T025
V048F120T025
V048F160T019
V048F240T012
V048F320T009
V048F480T006
V048F480T006
100
100
100
80
1.2
1.5
1.8
2.0
80
3.3
60
5.0
40
10
25
12
25
15
18.8
12.5
9.4
6.3
6.3
24
28
36
48
Note:
(1) See Table 2 on page 9 for nominal Vout range and K factors.
(2) See “PRM output power vs. VTM output power” on Page 10
(3) 1% precision resistors recommended
Table 1 — Configure your Chip Set using the PRM-AL
vicorpower.com
800-735-6200
V•I Chip Pre-Regulator Module
P048F048T24AL
Rev. 1.7
Page 2 of 14