
PFE1100-12-054NA White Paper Issue 6
PFE1100-12-054NA Features
?Best-in-class “Platinum” graded ef?ciency
? Wide input voltage range: 90-264 VAC
? AC input with power factor correction
? Always-On 15 W programmable standby. 5V or
3.3V, pin selectable
? Hot-plug capable
? Parallel operation with active digital current
sharing
? Full digital controls for improved performance
? High density design: 25.6 W/in 3 .
? Small form factor: 54.5 (w) x 40.0 (h) x 322 (l) mm
? I 2 C communication interface for control,
programming and monitoring with PSMI bus or
PMBus?
? Over-temperature, output over-voltage and
over-current protection
? 2 kBytes of EEPROM for user information
? 2 Status LEDs: AC OK and DC OK with fault
signaling
The PFE1100-12-054NA AC-DC power supply is a
fully DSP controlled, highly ef?cient front-end. It
incorporates resonance-soft-switching technology
and interleaved power trains to reduce component
stresses, providing increased system reliability and
very high ef?ciency. With a wide input operating
voltage range and minimal linear derating of
output power with input voltage and temperature,
the PFE1100-12-054NA maximizes power availabil-
ity in demanding server, switch, and router appli-
cations while keeping power dissipation to a
minimum.
The front-end is fan cooled and ideally suited for
server integration with a matching air?ow path.
P e r i t u s P o w e r !
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The fan control proved to be very effective at
adjusting the speed of the fan as the output current
demand increases or decreases, keeping ambient
noise to a minimum and helping ensure power is
not wasted through inef?cient fan control.
Cooling is managed by a fan controlled by the DSP
controller. The fan speed is adjusted automatically
depending on the actual power demand and sup-
ply temperature and can be overridden through the
I 2 C bus.
The PFC stage is digitally controlled using a state-
of-the-art digital signal processing algorithm to
guarantee best ef?ciency and unity power factor
over a wide operating range.
The DC-DC stage uses soft switching resonant
techniques in conjunction with synchronous front-
ends. An active ORing device on the output en-
sures no reverse load current and renders the sup-
ply ideally suited for operation in redundant
power systems.
The Always On standby output with selectable
voltage level (3.3/5V) provides power to external
power distribution and management controllers.
Selection is straightforward and is set by a pin on
the output connector. Its protection with an active
ORing device provides for maximum reliability.
Status information is provided with front-panel
LEDs. In addition, the power supply can be
controlled via the I 2 C bus and programmed for
output voltage, current limitation, and fan speed.
In addition, it allows full monitoring of the supply,
including input and output voltage, current,
power, and inside temperatures.
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