Not Recommended for New Designs
P045F048T17AL
PRM
PRM
TM
Regulator
• 45 V input V•I Chip
TM
PRM
• Vin range 38 – 55 Vdc
• High density – 576 W/in
3
• Small footprint – 153 W/in
2
• Low weight – 0.5 oz (15 g)
• Adaptive Loop feedback
• ZVS buck-boost regulator
• 1.45 MHz switching frequency
• 97% efficiency
• 125˚C operation (T
J
)
V
IN
= 38 – 55 V
V
F
= 26 – 55 V
P
F
= 170 W
I
F
= 3.5 A
©
Product Description
The V•I Chip regulator 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 VTM
TM
Transformer — 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
TM
(FPA)
TM
: 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 160 W at a FPA system density of
169 A/in
3
or 271 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
3.54
170
225
245
-40 to 125
-40 to 125
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
mA
Adc
W
°C
°C
°C
°C
Notes
MSL 5
MSL 6
T-Grade
T-Grade
DC-DC Converter
0.01 µF
VC
P
C
T
M
IL
NC
P
R
10 kΩ
PRM
®
-AL
Module
+In
+Out
VH
SC
SG
OS
NC
CD
R
OS
R
CD
Factorized
Bus (V
F
)
0.4 µH
+In
+Out
+Out
TM
VC
PC
VTM
®
Module
– Out
V
IN
–In
–Out
10
Ω
– In
K
Ro
L
O
A
D
– Out
The P045F048T17AL is used with any 048 input series VTM to provide a regulated and
isolated output.
vicorpower.com
800-735-6200
V•I Chip Regulator
P045F048T17AL
Rev. 2.6
Page 1 of 14
Not Recommended for New Designs
General Specifications
Part Numbering
V•I Chip Regulator
P
Regulator
045
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
)
-40 to125 -40 to125
T
17
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
.
0.01 µF
VC
P
C
T
M
IL
NC
P
R
10 kΩ
PRM
®
-AL
Module
+In
+Out
VH
SC
SG
OS
NC
CD
R
OS
R
CD
Factorized
Bus (V
F
)
0.4 µH
+In
+Out
+Out
TM
VC
PC
VTM
®
Module
– Out
V
IN
–In
–Out
10
Ω
– In
K
Ro
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 Regulator
P045F048T17AL
Rev. 2.6
Page 2 of 14
Not Recommended for New Designs
Electrical Specifications
Input Specs
(Conditions are at 45 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
32.1
55.3
35.7
33.6
56.6
57.7
0.5
4.0
470
2.9
5
100
5.8
59.4
1
Min
38
Typ
45
Max
55
1
37.3
Unit
Vdc
V/µs
Vdc
Vdc
Vdc
Vdc
mA
Adc
mA p-p
W
µF
µF
Ceramic
See Figure 5 for input filter circuit.
Source impedance dependent
See Figures 4 & 5
PC low
Note
V•I Chip Regulator
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
0.01
μF
VC
PC
TM
IL
NC
PR
10 A
10 kΩ
+IN
1000
μF
Al-Electrolytic
PRM-AL
+In
+Out
VH
SC
SG
OS
NC
CD
2.37 kΩ
+ 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 Regulator
P045F048T17AL
Rev. 2.6
Page 3 of 14
Not Recommended for New Designs
Electrical Specifications
(continued)
Output Specs
(Conditions are at 45 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
180
100
5
47
230
ms
µs
µF
µF
See Figure 2
See Figure 3
Ceramic
1.35
1.25
0.75
1.45
1.75
1.0
1.56
%
%
MHz
Factorized Bus, see Figure 13
Factorized Bus, see Figure 14
Fixed frequency - across entire operating range
56
96.7
59.4
%
Vdc
See Figure 6,7 & 8
1.5
0.1
0.1
1.0
5
0.2
0.2
2.0
10
Min
26
0
0
3.7
4.2
Typ
48
Max
55
170
3.5
4.7
0.5
Unit
Vdc
W
Adc
Adc
A
%
%
%
%
%
Low line to high line
No CD resistor
Adaptive Loop
I
L
pin floating
Auto recovery
Note
Factorized Bus voltage (Vf) set by R
OS
V•I Chip Regulator
vicorpower.com
800-735-6200
V•I Chip Regulator
P045F048T17AL
Rev. 2.6
Page 4 of 14
Not Recommended for New Designs
Electrical Specifications
(continued)
Efficiency Graphs
98
96
94
92
90
88
86
84
82
80
78
0.3
0.7
1.1
1.4
1.8
2.1
2.5
2.8
3.2
3.5
V•I Chip Regulator
Efficiency vs. Output Current
Efficiency (%)
38V
45V
55V
Efficiency (%)
Vin
98
97
95
93
91
89
87
85
83
81
79
77
Efficiency vs. Output Current
Vin
38V
45V
55V
Output Current (A)
0.4
0.7
1.1
Output Current (A)
1.4
1.8
2.1
2.5
2.8
3.2
3.5
Figure 6
— Efficiency vs. output current at 48 Vf
Figure 7
— Efficiency vs. output current at 36 Vf
97
95
93
91
89
87
85
83
81
79
77
0.3
Efficiency vs. Output Current
Efficiency (%)
Vin
38V
45V
55V
0.7
1.1
Output Current (A)
1.4
1.8
2.1
2.5
2.8
3.2
3.5
Figure 8
— Efficiency vs. output current at 26 Vf
vicorpower.com
800-735-6200
V•I Chip Regulator
P045F048T17AL
Rev. 2.6
Page 5 of 14
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