FARMTM

Features: EMI filteringChoice of 500W or 750W modules96% EfficiencyAutoranging 115/230Vac inputMicroprocessor controlledInrush current limitingMini sized packagePower fail signalModule enableApplicationThe Filtered, Autoranging Rectifier Module (FARM) provides an effective solution for the AC fron...

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SeekIC No. : 004340622 Detail

FARMTM: Features: EMI filteringChoice of 500W or 750W modules96% EfficiencyAutoranging 115/230Vac inputMicroprocessor controlledInrush current limitingMini sized packagePower fail signalModule enableApplica...

floor Price/Ceiling Price

Part Number:
FARMTM
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/3/28

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Product Details

Description



Features:

EMI filtering
Choice of 500W or 750W modules
96% Efficiency
Autoranging 115/230Vac input
Microprocessor controlled
Inrush current limiting
Mini sized package
Power fail signal
Module enable



Application

The Filtered, Autoranging Rectifier Module (FARM) provides an effective solution for the AC front end of a power supply built with Vicor DC-DC converters. This     high performance power system building block satisfies a broad spectrum of requirements and agency standards.

In addition to providing transient/surge immunity and EMI filtering, the FARM contains all of the power switching and control circuitry necessary for     autoranging rectification, inrush current limiting, and overvoltage protection. This module also provides converter enable and status functions for orderly     power up/down control or sequencing. To complete the AC front end configuration, the user only needs to add hold-up capacitors, and a few discrete     components.



Specifications

Parameter Rating Unit Notes
L to N voltage 264 Vdc Continuous
L to N voltage 280 Vdc 100ms
+Out to Out voltage 400 Vdc  
B OK to Out voltage 16 Vdc  
EN to Out voltage 16 Vdc  
Mounting torque 4-6(0.45-0.68) in-lbs (N-m) 6 each, 4-40 screw
Pin soldering temperature 500 (260) °F (°C) <5 sec; wave solder
Pin soldering temperature 750 (390) °F (°C) <7 sec; hand solder



Description

Upon application of input power, the output bus capacitors begin to charge. The FARMTM thermistor limits the charge current, and the exponential time constant is determined by the hold-up capacitor value and the thermistor cold resistance. The slope (dv/dt) of the capacitor voltage versus time approaches zero as the capacitors become charged to the peak of the AC line voltage.

The FARMTM switch that bypasses the inrush limiting PTC (positive temperature coefficient) thermistor is open when power is applied, as is the switch that engages the strap for voltage doubling. (see Fig. 7). In addition, the converter modules are disabled via the Enable (EN) line, and Bus-OK (BOK) is high.

If the bus voltage is less than 200V as the slope nears zero, the voltage doubler is activated, and the bus voltage climbs exponentially to twice the peak line voltage. If the bus voltage is greater than 200V, the doubler is not activated.

If the FARMTM bus voltage is greater than 235V as the slope approaches zero, the inrush limiting thermistor is bypassed. Below 235V, it is not bypassed.

The FARMTM converters are enabled 50 milliseconds after the thermistor bypass switch is closed.

Bus-OK is asserted after an additional 50 millisecond delay to allow the converter outputs to settle within specification.




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