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LS2801R5DCMA Folha de dados(PDF) 2 Page - International Rectifier

Nome de Peças LS2801R5DCMA
Descrição Electrónicos  HYBRID - HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER
Download  16 Pages
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Fabricante Electrônico  IRF [International Rectifier]
Página de início  http://www.irf.com
Logo IRF - International Rectifier

LS2801R5DCMA Folha de dados(HTML) 2 Page - International Rectifier

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LS-SERIES
(28V Input, Single/Dual Output)
The LS-Series converters utilize a single-ended
forward topology with resonant reset. The nominal
switching frequency is 500kHz. Electrical isolation
and tight output regulation are achieved through the
use of a magnetically coupled feedback. Voltage
feed-forward with duty factor limiting provides high
line rejection and protection against output over
voltage in the event of an internal control loop failure.
Circuit Description
An internal EMI filter allows the converter to meet
the conducted emissions requirements of MIL-STD-
461C on the input power leads.
An external inhibit port is provided to control
converter operation. The converter’s operation is
inhibited when this pin is pulled low. It is intended
to be driven by an open collector logic device. The
pin may be left open for normal operation and has a
nominal open circuit voltage of 11V with respect to
the input return (pin 2).
Output current is limited under any load fault
condition to approximately 125% of rated. An
overload condition causes the converter output
voltage to drop below nominal. The converter will
resume normal operation when the load current is
reduced below the current limit point. This protects
the converter from both overload and short circuit
conditions. The current limit point exhibits a slightly
negative temperature coefficient to reduce the
possibility of thermal runaway.
The LS-Series was developed using a proven
conservative design methodology derived from other
space level designs that includes selection of
established reliability components and fully de-
rating to the requirements of MIL-STD-975
except
for the CDR type of capacitors, a capacitor with 50V
rating is used for in-circuit voltage stress of less
than10V. A magnetic feedback circuit is utilized
instead of opto -couplers to minimize temperature,
aging and radiation sensitivity. PSPICE was used
extensively to predict and optimize circuit
performance for both beginning and end-of-life.
Thorough design analyses include stress, thermal,
and reliability (MTBF).
The output voltage of all models can be adjusted
using a single external resistor.
Design Methodology


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