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VI Chip Pre-Regulator Module
P036F048T12AL
Rev. 1.4
Page 2 of 14
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 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, RO.
-In
PC
VC
TM
+In
-Out
+Out
VTM
+Out
-Out
K
Ro
+Out
–Out
+In
–In
VC
PC
TM
IL
VH
PR
NC
SG
SC
PRM-AL
OS
NC
CD
L
O
A
D
Factorized
Bus (Vf)
Vo = VL ± 1.0%
(IoRo)
K
Vf = V
L +
K
Vin
ROS
RCD
Output Power
Designator
(=Pf /10)
P
036
F
048
T
12
AL
Pre-Regulator
Module
Input Voltage
Designator
Product Grade Temperatures (°C)
Grade
Storage Operating (TJ)
T
-40 to125 -40 to125
Configuration
F = J-lead
T = Through hole
Nominal
Factorized Bus
Voltage
AL = Adaptive Loop
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.
General Specifications
VI Chip Pre-Regulator Module
Part Numbering
Desired Load Voltage (Vdc)
VTM P/N(1)
Max VTM Output Current (A)(2)
ROS (kΩ)(3)
RCD (Ω)(3)
1.0
V048F015T100
100
3.57
26.1
1.2
V048F015T100
100
2.94
32.4
1.5
V048F015T100
100
2.37
39.2
1.8
V048F020T080
80
2.61
35.7
2.0
V048F020T080
80
2.37
39.2
3.0
V048F030T070
70
2.37
39.2
3.3
V048F040T050
50
2.89
32.6
5.0
V048F060T040
40
2.87
33.2
8.0
V048F080T030
30
2.37
32.9
9.6
V048F096T025
25
2.37
32.9
10
V048F120T025
25
2.86
32.9
12
V048F120T025
25
2.37
39.2
15
V048F160T015
15
2.49
37.4
24
V048F240T012
12.5
2.37
39.2
28
V048F320T009
9.4
2.74
35.7
36
V048F480T006
6.3
3.16
30.1
48
V048F480T006
6.3
2.37
39.2
Table 1 — Configure your Chip Set using the PRM-AL
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