PFF3000-12-069RD is a 3 kW DC/DC front-end converter that
provides a main output 12.5 VDC from 40 - 72 VDC bus voltages to
power Intermediate Bus Architectures (IBA) in high-performance and
high-reliability servers, routers, and network switches.
Features include very high efficiency, high reliability, low output voltage
noise, and excellent dynamic response to load / input changes.
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•
•
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Best-in-class, platinum equivalent efficiency
Input voltage range: 40 - 72 VDC
Up to 3 kW output power - 244 A output current
Hot-plug capable
Parallel operation with active analog current sharing
2 Status LEDs: DC input OK and warning / fault signaling
High density design: 30.5 W/in
3
Form factor: 69 x 42 x 555 mm
Full digital controls for improved performance
RoHS Compliant
Reverse polarity, over temperature, output overvoltage, and
overcurrent protections
I2C communication interface for control, programming, and monitoring
with PMBus® protocol
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High Performance Servers
Routers
Switches
Disclaimer: PMBus is a registered trademark of SMIF, Inc.
2
PFF3000-12-069RD
PFF
3000
Power Level
3000 W
-
Dash
12
V1 Output
12.5 V
-
Dash
069
Width
69 mm
R
Airflow
R: Reversed
1
D
Input
D: DC
Option Code
Blank:
Standard model
Product Family
PFF Front-Ends
1
Front to Rear
PFF3000-12-069RD power supply is a fully digital controlled, highly efficient front-end converter. It incorporates state-of-the-art
technology and uses an interleaved forward converter topology with active clamp and synchronous rectification to reduce
component stresses, thus providing increased system reliability and very high efficiency.
With a wide DC input voltage range and minimal linear output power derating with ambient temperature, PFF3000-12-069RD
maximizes power availability in demanding server, switch, and router applications. The frontend is fan cooled and ideally suited for
server integration with a matching airflow path.
Active OR-ing devices on the main output ensure no reverse load current and render the supply ideally suited for operation in
redundant power systems. The standby output (12V/2A) provides power to external power distribution and management controllers.
Its protection with an active OR-ing device provides for maximum reliability.
Status information is provided with two front-panel LEDs. In addition, the power supply can be controlled via I2C bus. This allows
full monitoring of the supply, including input and output voltage, current, power, and inside temperatures. Cooling is managed by a
fan controlled by the DSP controller. The fan speed is adjusted automatically depending on the actual power demand and supply
temperature and can be overridden through the I2C bus.
Figure 1. PFF3000-12-0069RD Block Diagram
tech.support@psbel.com
PFF3000-12-069RD
3
Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely affect long-term reliability, and
cause permanent damage to the supply.
PARAMETER
Vi maxc
Maximum Input
CONDITIONS / DESCRIPTION
Continuous
MIN
MAX
75
UNITS
V
DC
General Condition: T
A
= 0… 45 °C
unless otherwise noted.
PARAMETER
V
I start
V
I nom
V
I
I
I
I
I pk
V
I on_uv
V
I off_uV
V
I on_ov
V
I off_oV
Minimum operating input voltage
Nominal input voltage
Input voltage
Input current
Inrush current limitation
Turn-on input voltage low
Turn-off input voltage low
Turn-on input voltage high
Turn-off input voltage high
Normal operation (from V
I min
to V
I max
)
V
I
> V
I min
From V
i min
to V
i max
, T
A
= 25°C
Ramping up
Ramping down
Ramping down
Ramping up
V
I nom
, 0.2
∙
I
1 nom
, V
1 nom
, T
A
= 25 °C
Η
Efficiency (fan power not included)
V
I nom
, 0.5
∙
I
1 nom
, V
1 nom
, T
A
= 25 °C
V
I nom
,
I
1 nom
, V
1 nom
, T
A
= 25 °C
42.5
38.0
68.5
72.0
90.0
94.0
91.0
93.8
95
93
40
DESCRIPTION / CONDITION
Communication available, DSP running
MIN
NOM
MAX
35
UNIT
V
DC
V
DC
53
72
85
100
43.5
39.5
69.5
75.0
V
DC
A
A
V
DC
V
DC
V
DC
V
DC
%
%
%
4.1 INPUT FUSE
Fast-acting 100 A input fuse in series on minus DC rail inside the PSU protects against severe defects. The fuse is not accessible
from the outside and is not therefore a serviceable part.
4.2 INRUSH CURRENT & REVERSE POLARITY PROTECTION
Internal bulk capacitors will be charged through NTC resistors connected from bulk cap minus pin to the DC rail minus, thus
limiting the inrush current. After the inrush phase, NTC resistors are then shorted with MOSFETs connected in parallel. Inrush
control is managed by the digital controller (DSP).
Parallel connected MOSFETs in series to the DC minus rail input act as a reverse polarity blocking element (Fig. 1). In case of
a short at the input voltage or input reverse polarity, these MOSFETs will open and prevent the bulk caps to be discharged via
the input. Reverse polarity control is managed by a fast-acting analog circuit.
NOTE:
In order to keep max inrush current below I
I
max, it is not recommended to repeat plug-in/-out operations within 20 s.
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+86 755 298 85888
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
BCD.00886_011
© 2018 Bel Power Solutions & Protection
4
PFF3000-12-069RD
4.3 INPUT UNDER-VOLTAGE
If input voltage V
I
is below the input under-voltage lockout threshold V
I min
, main output will be inhibited. Once the input voltage
returns within the normal operating voltage range, main output voltage will be enabled again and converter returns into normal
operation.
4.4 EFFICIENCY
High efficiency is achieved by using state-of-the-art silicon power devices, thus minimizing conduction and switching losses
by an optimized design and layout. Synchronous rectifiers on the output stage reduce losses in the high current output path.
Fan speed is digitally controlled in order to keep all components below critical operating temperature.
96
95
94
Efficiency [%]
93
92
91
90
89
88
0
500
1000
1500
Po [W]
Figure 2. Efficiency vs. Load Current
Vi = 53Vac, fan internal, standby proportional loaded
Vi =53Vac, fan external, standby unloaded
Platinum
2000
2500
3000
tech.support@psbel.com
PFF3000-12-069RD
5
General Condition: T
A
= 0…45 °C
unless otherwise noted.
PARAMETER
Main Output V
1
V
1 nom
V
1 set
dV
1 tot
P
1 nom
I
1 nom
I
V1 lim
I
V1 ol
I
V1 ol lim
V
1 pp
dV
1 Load
dV
1 droop
dV
1 Line
dI
share
dV
1dyn
T
1rec
Short time over load current
Current limit during short time
overload
V
1
Main output ripple voltage
Load regulation
Droop
Line regulation
Current sharing accuracy
Dynamic load regulation
Recovery time
Start-up time from DC input
Rise time (monotonic)
Hold-up time
Capacitive loading
Nominal standby output voltage
Standby output set-point accuracy
Total regulation
Nominal standby output power
Nominal standby output current
Standby output ripple voltage
Current limit
Over load current limit time on V
SB
Load regulation
Droop
dV
SBdyn
T
SBrec
Dynamic load regulation
Recovery time
Start-up time from DC input
Rise time (monotonic)
Hold-up time
Capacitive loading
Time to hit hiccup when in over current
0
–
100% I
SB nom
0
–
100% I
SB nom
I
SB
= 5%...50% I
SB nom
,
I
SB tot
= I
1
+
ΔI
1
,
Δ
I
SB
= 50 % I
SB nom
,
dI
o
/ dt = 1 A/µs,
recovery within 1% of V
SB nom
V
SB
= 90% V
SB nom
V
SB
= 10%...90% V
SB nom
-0.6
V
1
= 12.3 VDC,
T
a min to
T
a max
, maximum duration 20 ms
(See Section 5.2 and 6)
Nominal main output voltage
Main output voltage set-point
accuracy
Total regulation
Nominal main output power
Nominal main output current
0.5
∙
I
1 nom
, T
A
= 25 °C
0.5
∙
I
1 nom
, T
A
= 25 °C
V
I min
to V
I max
, 0 to 100% I
1 nom
,
T
A min
to T
A max
V
1
= V
1 nom
± 1.0% V
1 nom
V
1
= V
1 nom
± 1.0% V
1 nom
-0.5
-1.0
3000
244
See table Protection
280
See table Protection
V
1 nom
, I
1 nom
, 20 MHz BW
V
i nom
, 0
–
100% I
1 nom
0
–
100% I
1 nom
V
I
= V
I min
…V
I max
Deviation I
1 tot
/ N, I
1
> 30% I
1 nom
I
1
= 10%...50% I
1 nom
,
I
1 tot
= I
1
+
ΔI
1
,
ΔI
1
= 50 % I
1 nom
,
dI
o
/ dt = 1 A/µs,
recovery within 1% of V
1 nom
V
1
= 10.8 V
DC
V
1
= 10%...90% V
1 nom
, 50% I
1 nom
0.5
∙
I
1
, V
I
= V
I nom
T
A
= 25 °C
0.5
∙
I
SB nom
, T
A
= 25 °C
0.5
∙
I
SB nom
, T
A
= 25 °C
V
i min
to V
i max
, 0 to 100% I
SB nom
,
T
A min
to T
A max
V
SB
= V
SB nom
± 0.5% V
SB nom
V
SB
= V
SB nom
± 0.5% V
SB nom
V
SB nom
, I
SB nom
, 20 MHz BW
-1.5
-1.5
24
2
120
See table Protection
See table Protection
220
110
+0.6
5
See table on/ off signal timings
0.1
5
1000
260
ms
ms
µF
mV
mV/A
V
ms
12.00
+1.5
+1.5
2
10000
-5
-0.6
170
0.7
0
+5
+0.6
1
See table on/ off signal timings
4.5
ms
ms
µF
V
DC
% V
SB
nom
DESCRIPTION / CONDITION
MIN
NOM
MAX
UNIT
12.5
+0.5
+1.0
V
DC
% V
1 nom
% V
1 nom
W
A
A
160
mV
pp
mV
mV/A
mV
%
V
ms
t
V1_Pwr_On
t
V1 rise
t
V1_holdup
C
load
V
SB nom
V
SB set
dV
SB tot
P
SB nom
I
SB nom
V
SB pp
I
VSB lim
t
VSB lim
dV
SB
Standby Output V
SB
% V
SB
nom
W
A
mV
pp
t
VSB_Pwr_On
t
VSB rise
t
VSB_holdup
C
load
I
sb
=0…2A,
V
I
> 48V
T
A
= 25 °C
Asia-Pacific
+86 755 298 85888
Europe, Middle East
+353 61 225 977
North America
+1 408 785 5200
BCD.00886_011
© 2018 Bel Power Solutions & Protection
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