End of Life
PRM
®
Regulator
P048F048T12AL
S
C
NRTL
US
Non-isolated Regulator
Features
• 48 V input VI Chip
®
PRM
®
• Vin range 36 – 75 Vdc
• High density – 407 W/in
3
• Small footprint – 108 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)
©
V
IN
= 36 – 75 V
V
OUT
= 26 – 55 V
P
OUT
= 120 W
I
OUT
= 2.5 A
Product Description
The VI 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
®
Transformer — fast,
efficient, isolated, low noise Point-of-Load (POL)
converters. In combination, PRMs and VTMs 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 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
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
VC
P
C
T
M
IL
NC
P
R
VH
SC
SG
OS
NC
CD
0.01 µF
10 kΩ
PRM
®
-AL
Module
+In
+Out
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 P048F048T12AL is used with any 048 input series VTM to provide a regulated and
isolated output.
PRM
®
Regulator
Page 1 of 14
Rev 3.1
12/2013
vicorpower.com
800 735.6200
Not Recommended for New Designs
General Specifications
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 more information
on configuring a PRM & VTM pair for adaptive loop, please see
AN:024
“Accurate Point of Load Voltage Regulation Using Simple
Adaptive Loop Feedback.”
The VI Chip’s bi-directional VC port :
P048F048T12AL
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.
PRM
®
Regulator
Page 2 of 14
Rev 3.1
12/2013
vicorpower.com
800 735.6200
Not Recommended for New Designs
Electrical Specifications
Input Specs
(Conditions are at 48 V
IN
, 48 V
OUT
, 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
[a] Will operate down to 13.5 V after start up
≥
16 V
P048F048T12AL
Min
36
Typ
48
33.8
Max
75
1
35.3
Unit
Vdc
V/µs
Vdc
Vdc
Vdc
Note
30.4
75.7
31.8
77.3
78.8
0.5
2.6
280
2.4
5
100
4
81.0
1
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
Input Waveforms
Figure 2
— V
OUT
and PC response from power up
Figure 3
— V
OUT
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 at full load and 28 V
IN
Figure 5
— Input filter capacitor recommendation
PRM
®
Regulator
Page 3 of 14
Rev 3.1
12/2013
vicorpower.com
800 735.6200
Not Recommended for New Designs
Electrical Specifications
(continued)
Output Specs
(Conditions are at 48 V
IN
, 48 V
OUT
, 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 enable
Internal output capacitance
Factorized Bus capacitance
800
200
1200
5
47
300
1600
ms
µs
µF
µF
See Figure 2
See Figure 3
Ceramic
1.35
1.0
0.5
1.45
2.0
1.0
1.55
%
%
MHz
94.5
56
95.5
59.4
%
Vdc
1.0
0.1
0.1
1.0
5.5
Min
26
0
0
2.6
3.0
Typ
48
Max
55
120
2.5
3.3
0.5
1.5
0.2
0.2
2.0
15
Unit
Vdc
W
Adc
Adc
A
%
%
%
%
%
I
L
pin floating
Auto recovery
Note
P048F048T12AL
Factorized Bus voltage (Vf) set by R
OS
R
OS
= 2.37 K, no CD resistor
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
PRM
®
Regulator
Page 4 of 14
Rev 3.1
12/2013
vicorpower.com
800 735.6200
Not Recommended for New Designs
Electrical Specifications
(continued)
Efficiency Charts
98
94
P048F048T12AL
Efficiency & Power Dissipation -40° Case
17.5
98
94
Efficiency & Power Dissipation 25° Case
17.5
Power Dissipation (W)
90
86
82
78
74
70
12.5
90
86
82
78
74
70
12.5
10.0
7.5
P
D
10.0
7.5
5.0
2.5
P
D
5.0
2.5
0.0
0.3
0.5
0.8
1.0
1.3
1.5
1.8
2.0
2.3
0.0
2.5
0.0
0.3
0.5
0.8
1.0
1.3
1.5
1.8
2.0
2.3
0.0
2.5
Load Current (A)
V
IN
:
36 V
48 V
75 V
36 V
48 V
75 V
V
IN
:
36 V
48 V
Load Current (A)
75 V
36 V
48 V
75 V
Figure 6
— Efficiency and power dissapation vs. output current at 36 V
OUT,
,
-40 °C T
CASE
Figure 7
— Efficiency and power dissapation vs. output current at 36 V
OUT
,
25 °C T
CASE
98
94
Efficiency & Power Dissipation 100° Case
17.5
4.0
No Load Power Dissipation vs. Line
Power Dissipation (W)
Power Dissipation (W)
15.0
3.5
3.0
2.5
2.0
1.5
36
39
42
45
48
51
54
57
60
63
66
69
72
75
Efficiency (%)
90
86
82
78
74
70
12.5
P
D
10.0
7.5
5.0
2.5
0.0
0.3
0.5
0.8
1.0
1.3
1.5
1.8
2.0
2.3
0.0
2.5
Load Current (A)
V
IN
:
36 V
48 V
75 V
36 V
48 V
75 V
T
CASE
:
Input Voltage (V)
-55 °C
25 °C
100 °C
Figure 8
— Efficiency and power dissapation vs. output current at 36 V
OUT
,
100 °C T
CASE
Figure 9
— No load power, unit enabled vs. line
96
Full Load Efficiency vs. T
CASE
Full Load Efficiency (%)
95
94
93
92
91
-55
-40
-25
-10
5
20
35
50
65
80
95
Case Temperature (°C)
V
IN
:
36 V
48 V
75 V
Figure 10
— Full load efficiency vs T
CASE
PRM
®
Regulator
Page 5 of 14
Rev 3.1
12/2013
vicorpower.com
800 735.6200
Power Dissipation (W)
15.0
15.0
Efficiency (%)
Efficiency (%)
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