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DATA SHEET
1
ORDERING INFORMATION
PFE
Product Family
PFE Front-Ends
850
Power Level
850 W
-
Dash
12
V1 Output
12 V
-
Dash
054
Width
54 mm
x
Airflow
N: Normal
A
Input
A: AC
R: Reversed
2
OVERVIEW
The PFE850-12-054xA AC-DC power supply is a fully DSP controlled, highly efficient front-end. It incorporates resonance-
soft-switching technology and interleaved power trains to reduce component stresses, providing increased system reliability
and very high efficiency. With a wide input operating voltage range and minimal linear derating of output power with input
voltage and temperature, the PFE850-12-054xA maximizes power availability in demanding server, switch, and router appli-
cations. The front-end is fan cooled and ideally suited for server integration with a matching airflow path.
The PFC stage is digitally controlled using a state-of-the-art digital signal processing algorithm to guarantee best efficiency
and unity power factor over a wide operating range.
The DC-DC stage uses soft switching resonant techniques in conjunction with synchronous rectification. An active OR-ing
device on the output ensures no reverse load current and renders the supply ideally suited for operation in redundant power
systems.
The always-on standby output with selectable voltage level (3.3/5 V) provides power to external power distribution and man-
agement controllers. Its protection with an active OR-ing device provides for maximum reliability.
Status information is provided with front-panel LEDs. In addition, the power supply can be controlled and the fan speed set
via the I 2 C bus. It allows full monitoring of the supply, including input and output voltage, current, power, and inside tempera-
tures.
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 I 2 C bus.
Figure 1 – PFE850-12-054xA Block Diagram
L
DC
V1
Vsb
Filter
PFC
Buck
VsbSense+
VsbSense-
DC
N
GND
PE
Aux
Converter
FAN
EEPROM
V1Sense+
Digital
Digital
V1Sense-
Prim
Controls
Communication Bus
Sec
Controls
I2C
APS
Logic Signals
3
ABSOLUTE MAXIMUM RATINGS
Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely affect long-term reliabil-
ity, and cause permanent damage to the supply.
PARAMETER
Vi maxc
Maximum Input
DESCRIPTION / CONDITION
Continuous
MIN
NOM
MAX
264
UNIT
VAC
PFE850-12-054xA
2
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