PRELIMINARY
General Specifications
Part Numbering
V•I Chip Pre-Regulator Module
P
Pre-Regulator
Module
048
Input Voltage
Designator
K
Configuration Options
F = Onboard (Fig.22)
K = Inboard (Fig.21)
048
Nominal
Factorized Bus
Voltage
T
Product Grade Temperatures (°C)
Grade
Storage Operating
T
-40 to150 -40 to125
M
-65 to150 -55 to125
24
Output Power
Designator
(=P
f
/10)
AL
AL = Adaptive Loop
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 load 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 selection of R
OS
and R
CD
, refer to Table 1 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, R
O
.
Vo = V
L
±
1.0%
VC
PC
TM
IL
NC
PR
VH
SC
SG
OS
NC
CD
R
OS
R
CD
+In
PRM-AL
Factorized
Bus (V
f
)
V
f
=
V
L
(Io•Ro)
+
K
K
+In
+Out
+Out
TM
VC
PC
VTM
K
Ro
-Out
+Out
Vin
–In
–Out
-In
L
O
A
D
-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)
1.0
1.2
1.5
1.8
2.0
3.3
5.0
10
12
15
24
28
36
48
VTM P/N
(1)
V048K015T100
V048K015T100
V048K015T090
V048K020T080
V048K020T080
V040K033T060
V048K060T040
V048K120T025
V048K120T025
V048K160T019
V048K240T012
V048K320T009
V048K480T006
V048K480T006
Max VTM Output Current (A)
(2)
100
100
90
80
80
60
40
25
25
18.8
12.5
9.4
6.3
6.3
R
OS
(kΩ)
(3)
3.57
2.94
2.37
2.61
2.37
2.15
2.87
2.26
2.37
2.49
2.37
2.74
3.16
2.37
R
CD
(Ω)
(3)
26.1
32.4
39.2
35.7
39.2
43.2
33.2
41.2
39.2
37.4
39.2
35.7
30.1
39.2
Note:
(1) Verify the configuration option and product grade temperature before ordering as shown above.
(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
P048K048T24AL
Rev. 1.4
Page 2 of 15
VICOR [ VICOR CORPORATION ]
