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PFM4414BB6M24D0C00 Datasheet(PDF) 16 Page - Vicor Corporation

No. de Pieza. PFM4414BB6M24D0C00
Descripción  Chassis mount or board mount packaging options
Descarga  23 Pages
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Fabricante  VICOR [Vicor Corporation]
Página de inicio  http://www.vicorpower.com
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PFM4414BB6M24D0C00 Datasheet(HTML) 16 Page - Vicor Corporation

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PFM4414xB6M24D0yzz
PFMin a VIA Package
Rev 1.0
vicorpower.com
Page 16 of 23
12/2015
800 927.9474
Overcurrent (OC) Fault Protection
The unit’s output current, determined by VEAO, VIN_B and the primary-
side sensed output voltage is monitored by the microcontroller to
detect an output OC condition. If the output current exceeds its current
limit, a fault is detected, the reset logic disables the modulator, the
modulator stops powertrain switching, and the output voltage of the
module falls after a time tOC. As long as the fault persists, the module
goes through an auto-restart cycle with off time equal to tOFF + tON and
on time equal to tOC. Faults shorter than a time tOC may not be
detected. Once the fault is cleared, the module follows its normal start
up sequence after a time tOFF.
Short Circuit (SC) Fault Protection
The microcontroller determines a short circuit on the output of the unit
by measuring its primary sensed output voltage and EAO. Most
commonly, a drop in the primary-sensed output voltage triggers a short
circuit event. The module responds to a short circuit event within a
time tSC. The module then goes through an auto restart cycle, with an
off time equal to tOFF + tON and an on time equal to tSC, for as long as
the short circuit fault condition persists. Once the fault is cleared, the
unit follows its normal start up sequence after a time tOFF. Faults
shorter than a time tSC may not be detected.
Temperature Fault Protection
The microcontroller monitors the temperature within the
PFM. If this temperature exceeds TJ-OTP+, an overtemperature fault is
detected, the reset logic block disables the modulator, the modulator
stops the powertrain switching and the output voltage of the PFM falls.
Once the case temperature falls below TCASE-OTP-, after a time greater
than or equal to tOFF, the converter recovers and undergoes a normal
restart. For the C-grade version of the converter, this temperature is
75°C. Faults shorter than a time tOTP may not be detected. If the
temperature falls below TCASE-UTP-, an undertemperature fault is
detected, the reset logic disables the modulator, the modulator stops
powertrain switching and the output voltage of the unit falls. Once the
case temperature rises above TCASE-UTP, after a time greater than or
equal to tOFF, the unit recovers and undergoes a normal restart.
Output Overvoltage Protection (OVP)
The microcontroller monitors the primary sensed output voltage to
detect output OVP. If the primary sensed output voltage exceeds VOUT-
OVLO
+, a fault is latched, the logic disables the modulator, the modulator
stops powertrain switching, and the output voltage of the module falls
after a time tSOVP. Faults shorter than a time tSOVP may not be detected.
This type of fault is a latched fault and requires that 1) the EN pin be
toggled or 2) the input power be recycled to recover from the fault.
Hold-up Capacitance
The VIA PFM uses secondary-side energy storage (at the SELV 24 V bus)
and optional PRM® regulators to maintain output hold up through line
dropouts and brownouts. The module’s output bulk capacitance can be
sized to achieve the required hold up functionality.
Hold-up time depends upon the output power drawn from the VIA
PFM based AC-to-DC front end and the input voltage range of
downstream DC-to-DC converters.
The following formula can be used to calculate hold-up capacitance for
a system comprised of PFM and a downstream regulator:
Output Filtering
The VIA PFM requires an output bulk capacitor in the range of 27,000 μF
to 60,000 μF for proper operation of the PFC front-end. A minimum
40,000 μF is recommended for full rated output. Capacitance can be
reduced proportionally for lower maximum loads.
The output voltage has the following two components of voltage ripple:
1) Line frequency voltage ripple: 2*fLINE Hz component
2) Switching frequency voltage ripple: 1 MHz module switching
frequency component (see Figure 5).
Line Frequency Filtering
Output line frequency ripple depends upon output bulk capacitance.
Output bulk capacitor values should be calculated based on line
frequency voltage ripple. High-grade electrolytic capacitors with
adequate ripple current ratings, low ESR and a minimum voltage rating
of 35 V are recommended.
C = 2*POUT*(0.005+td) /(V2
2
– V1
2
)
where:
C
VIA PFM’s output bulk
capacitance in farads
td
Hold-up time in seconds
P
OUT
VIA PFM’s output power in watts
V2
Output voltage of VIA PFM’s
converter in volts
V1
Downstream regulator undervoltage turn off (volts)
–OR–
P
OUT / IOUT
-PK, whichever is greater.
lPK
lPK/2
loutDC
lf
LINE
Figure 20 – Output current waveform


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