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LS2802R5S Scheda tecnica(PDF) 2 Page - International Rectifier

Il numero della parte LS2802R5S
Spiegazioni elettronici  HIGH RELIABILITY DC/DC CONVERTER
Download  16 Pages
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Produttore elettronici  IRF [International Rectifier]
Homepage  http://www.irf.com
Logo IRF - International Rectifier

LS2802R5S Scheda tecnica(HTML) 2 Page - International Rectifier

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LS-SERIES
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. 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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