P048F048T12AL
P048F048M12AL
PRM
TM
Regulator
• 48 V input V•I Chip
TM
PRM
• Vin range 36 – 75 Vdc
• High density – 407 W/in
3
• Small footprint – 110 W/in
2
• Low weight – 0.5 oz (15 g)
• Adaptive Loop feedback
• ZVS buck-boost regulator
• 1.45 MHz switching frequency
• 96% Efficiency
• 125˚C operation (Tj)
Vin = 36 – 75 V
V
f
= 26 – 55 V
P
f
= 120 W
I
f
= 2.5 A
©
Product Description
The V•I Chip Pre-Regulator Module is a very efficient
non-isolated regulator capable of both boosting and
bucking a wide range input voltage. It is specifically
designed to provide a controlled Factorized Bus
distribution voltage for powering downstream V•I Chip
Voltage Transformation Modules — fast, efficient,
isolated, low noise Point-of-Load (POL) converters. In
combination, PRMs and VTMs
TM
form a complete
DC-DC converter subsystem offering all of the unique
benefits of Vicor’s Factorized Power Architecture (FPA):
high density and efficiency; low noise operation;
architectural flexibility; extremely fast transient response;
and elimination of bulk capacitance at the Point-of-Load
(POL).
In FPA systems, the POL voltage is the product of the
Factorized Bus voltage delivered by the PRM and the
"K-factor" (the fixed voltage transformation ratio) of a
downstream VTM. The PRM controls the Factorized Bus
voltage to provide regulation at the POL. Because VTMs
perform true voltage division and current multiplication,
the Factorized Bus voltage may be set to a value that is
substantially higher than the bus voltages typically
found in "intermediate bus" systems, reducing
distribution losses and enabling use of narrower
distribution bus traces. A PRM-VTM chip set can provide
up to 100 A, or 115 W at a FPA system density of
169 A/in
3
, or 195 W/in
3
— and because the PRM can
be located, or "factorized," remotely from the POL,
these power densities can be effectively doubled.
The PRM described in this data sheet features a unique
"Adaptive Loop" compensation feedback: a single wire
alternative to traditional remote sensing and feedback
loops that enables precise control of an isolated POL
voltage without the need for either a direct connection
to the load or for noise sensitive, bandwidth limiting,
isolation devices in the feedback path.
Absolute Maximum Ratings
Parameter
+In to -In
PC to -In
PR to -In
IL to -In
VC to -In
+Out to -Out
SC to -Out
VH to -Out
OS to -Out
CD to -Out
SG to -Out
Continuous output current
Continuous output power
Case temperature during reflow
Operating junction temperature
Storage temperature
Values
-1.0 to 85.0
-0.3 to 6.0
-0.3 to 9.0
-0.3 to 6.0
-0.3 to 18.0
-0.3 to 59
-0.3 to 3.0
-0.3 to 9.5
-0.3 to 9.0
-0.3 to 9.0
100
2.5
120
225
-40 to 125
-40 to 125
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
mA
Adc
W
°C
°C
°C
Notes
MSL 5
T-Grade
T-Grade
DC-DC Converter
VC
PC
TM
IL
NC
PR
VH
SC
SG
OS
NC
CD
+In
PRM-AL
Factorized
Bus (V
f
)
+In
+Out
+Out
TM
VC
PC
VTM
K
Ro
-Out
Vout
+Out
Vin
–In
–Out
-In
-Out
The P048F048T12AL is used with any 048 input series VTM to provide a regulated and
isolated output.
vicorpower.com
800-735-6200
V•I Chip Pre-Regulator Module
P048F048T12AL
Rev. 2.6
Page 1 of 14
General Specifications
Part Numbering
V•I Chip Pre-Regulator Module
P
Pre-Regulator
Module
048
Input Voltage
Designator
F
Configuration
F = J-lead
T = Through hole
048
Nominal
Factorized Bus
Voltage
T
Product Grade Temperatures (°C)
Grade
Storage Operating (T
J
)
T
-40 to125 -40 to125
M
-65 to 125 -55 to 125
12
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 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 selection of R
OS
and
R
CD
, 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, 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
3.0
3.3
5.0
8.0
9.6
10
12
15
24
28
36
48
VTM P/N
(1)
V048F015T100
V048F015T100
V048F015T100
V048F020T080
V048F020T080
V048F030T070
V048F040T050
V048F060T040
V048F080T030
V048F096T025
V048F120T025
V048F120T025
V048F160T015
V048F240T012
V048F320T009
V048F480T006
V048F480T006
Max VTM Output Current (A)
(2)
100
100
100
80
80
70
50
40
30
25
25
25
15
12.5
9.4
6.3
6.3
R
OS
(kΩ)
(3)
3.57
2.94
2.37
2.61
2.37
2.37
2.89
2.87
2.37
2.37
2.86
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
39.2
32.6
33.2
32.9
32.9
32.9
39.2
37.4
39.2
35.7
30.1
39.2
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
P048F048T12AL
Rev. 2.6
Page 2 of 14
Electrical Specifications
Input Specs
(Conditions are at 48 Vin, 48 Vf, full load, and 25°C ambient unless otherwise specified)
Parameter
Input voltage range
Input dV/dt
Input undervoltage turn-on
Input undervoltage turn-off
Input overvoltage turn-on
Input overvoltage turn-off
Input quiescent current
Input current
Input reflected ripple current
No load power dissipation
Internal input capacitance
Recommended external input capacitance
30.5
75.7
33.8
31.8
77.3
78.8
0.5
2.6
280
2
5
100
4
81.0
1
Min
36
Typ
48
Max
75
1
35.3
Unit
Vdc
V/µs
Vdc
Vdc
Vdc
Vdc
mA
Adc
mA p-p
W
µF
µF
Ceramic
PC low
Note
V•I Chip Pre-Regulator Module
See Figures 4 & 5
See Figure 5 for input filter circuit.
Source impedance dependent
Input Waveforms
Figure 2
— Vf and PC response from power up
Figure 3
— Vf turn-on waveform with inrush current – PC enabled
Reflected
Ripple
Measurement
VC
PC
TM
IL
NC
PR
10 A
+IN
100
μF
Al-Electrolytic
+In
PRM-AL
VH
SC
SG
OS
NC
CD
2.37 kΩ
+Out
+ OUT
–IN
–In
–Out
– OUT
Figure 4
— Input reflected ripple current
Figure 5
— Input filter capacitor recommendation
vicorpower.com
800-735-6200
V•I Chip Pre-Regulator Module
P048F048T12AL
Rev. 2.6
Page 3 of 14
Electrical Specifications
(continued)
Output Specs
(Conditions are at 48 Vin, 48 Vf, full load, and 25°C ambient unless otherwise specified)
Parameter
Output voltage range
Output power
Output current
DC current limit
Average short circuit current
Set point accuracy
Line regulation
Load regulation
Load regulation (at VTM output)
Current share accuracy
Efficiency
Full load
Output overvoltage set point
Output ripple voltage
No external bypass
With 10 µF capacitor
Switching frequency
Output turn-on delay
From application of power
From PC pin high
Internal output capacitance
Factorized Bus capacitance
200
100
5
47
300
ms
µs
µF
µF
1.35
1.0
0.5
1.45
2.0
1.0
1.55
%
%
MHz
56
95.6
59.4
%
Vdc
1.5
0.1
0.1
1.0
5
0.2
0.2
2.0
10
Min
26
0
0
2.6
3.0
Typ
48
Max
55
120
2.5
3.3
0.5
Unit
Vdc
W
Adc
Adc
A
%
%
%
%
%
Note
V•I Chip Pre-Regulator Module
Factorized Bus voltage (Vf) set by R
OS
I
L
pin floating
Auto recovery
Low line to high line
No CD resistor
Adaptive Loop
See Figure 6,7 & 8
Factorized Bus, see Figure 13
Factorized Bus, see Figure 14
Fixed frequency
See Figure 2
See Figure 3
Ceramic
vicorpower.com
800-735-6200
V•I Chip Pre-Regulator Module
P048F048T12AL
Rev. 2.6
Page 4 of 14
Electrical Specifications
(continued)
Efficiency Graphs
Efficiency vs. Output Current
100
95
100
95
V•I Chip Pre-Regulator Module
Efficiency vs. Output Current
Efficiency (%)
Efficiency (%)
Vin
90
85
80
75
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50
36V
48V
75V
90
85
80
75
70
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50
Vin
26V
48V
75V
Output Current (A)
Figure 6
— Efficiency vs. output current at 48 Vf
Output Current (A)
Figure 7
— Efficiency vs. output current at 36 Vf
Efficiency vs. Output Current
100
95
Efficiency (%)
90
85
80
75
70
65
60
0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50
Vin
36V
48V
75V
Output Current (A)
Figure 8
— Efficiency vs. output current at 26 Vf
vicorpower.com
800-735-6200
V•I Chip Pre-Regulator Module
P048F048T12AL
Rev. 2.6
Page 5 of 14
