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LSO2805S Datasheet

HYBRID-HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER

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HYBRID-HIGH RELIABILITY
RADIATION HARDENED
DC-DC CONVERTER
PD-97812
LSO SERIES
28V Input, Single/Dual Output
Description
The LSO Series of DC-DC converters are, high reliability
devices designed for hostile radiation hardened
environments. The design is based on the heritage-rich
LS Series with enhanced functional performance and
an inclusion of an output overvoltage protection. The
LSO Series provide up to 30 watts output power, small
size, low weight, integrated EMI filtering and a high
tolerance to environmental stresses such as radiation,
temperature extremes, mechanical shock, and vibration.
All components are fully de-rated to meet the requirements
of MIL-STD-1547, MIL-STD-975 and NASA EEE-INST-
002. Extensive documentation including, thermal
analysis, stress analysis and reliability predictions are
available.
The LSO Series of converters incorporate a fixed
frequency single forward topology with magnetic
feedback and an internal EMI filter. These converters
are capable of meeting the conducted emissions
requirements of MIL-STD-461C without any additional
components. All models include an external inhibit port
and have an adjustable output voltage. The converters
are overload, short circuit and output over-voltage
protected. They are enclosed in a hermetic 3.5" x 2.5" x
0.475" H steel package and weigh less than 125 grams.
The package utilizes rugged ceramic feed-through
copper core pins and is sealed using parallel seam
welding.
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are fabricated utilizing DLA
qualified processes. For available screening options,
refer to device screening table in the data sheet.
Variations in electrical specifications and screening to
meet custom requirements can be accommodated.
www.irf.com
LSO
Features
n 18 to 40V DC Input Range
n Total Ionization Dose > 100K Rad(Si)
n SEE Hardened to LET (Heavy Ions) up to
82 MeVcm2/mg (SEU, SEL, SEGB, SEGR)
n Internal EMI filter; Converter Capable of
meeting MIL-STD-461C CE03
n Derated per MIL-STD-1547, MIL-STD-975
and NASA EEE-INST-002
n Magnetically Coupled Feedback
n Up to 30W Output Power
n Single and Dual Output Models Include
1.5, 1.8, 2.5, 3.3, 5, 12, 15, ±5, ±12 and ±15V
n Remote Sense Compensation for Single
Output
n Latch-off Output Overvoltage Protection
n Input Current Telemetry
n Input Undervoltage Lockout with Latching
Mode Options
n High Efficiency - to 81%
n 20M@ 100VDC Isolation
n Undervoltage Protection
n Short Circuit and Overload Protection
n Adjustable Output Voltage
n Adjustable External OVP-115% to 125%
n External Inhibit
n Low Weight, < 125 grams
n 4000000 Hour MTBF (SF)
Applications
n Geo Synchronous Satellite
n Low Earth Orbit
n Deep Space Probe
n Communication and Display Systems
n Payload and Experiment LVPS
1
08/27/13
http://www.Datasheet4U.com


International Rectifier Electronic Components Datasheet

LSO2805S Datasheet

HYBRID-HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER

No Preview Available !

LSO SERIES
28V Input, Single/Dual Output
Circuit Description
The LSO 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.
An internal EMI filter allows the converter to meet
the conducted emissions requirements of MIL-STD-
461C on the input power leads.
Functional Notes
Input Current Telemetry: The LSO Series single
and dual output models also feature an input current
telemetry with a magnitude of 0 to 3.3V full scale.
The voltage signal at this pin (Pin 7) with respect to
Output Return (Pin 12) is equal to 1.5 times the input
current (Vin TLM (V) =1.5 *Input Current (A)+/-0.1V)
Short Circuit and Overload Protection: 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.
Input Undervoltage Lockout (UVLO) and
Undervoltage Release (UVR): The converter is
designed to be protected against an undervoltage
condition. The converter will be in a non-functional
(UVLO) mode when the input voltage is pproximately
15.5V or less. The converter will turn on when the
input voltage rises to 15.5V to 17.9V (defined as
UVR threshold) and will provide a regulated output
as the input voltage reaches 18V.
To take advantage of the latch-up feature, the U/V
Latch Pin (Pin 5) should be shorted (with less than
100 ohms) to the Inhibit Return Pin (Pin 4). Note that
in this mode the converter will latch off if an
undervoltage condition lasts more than 1milli-sec.
The converter is reset by a shorted Enable Input pin
command followed by an open Enable Input pin
command.
Output Overvoltage Protection: The converter
also features an output over-voltage protection.
One OVP circuitry for each output for the dual output
models. In an event the voltage output exceeds a
preset voltage threshold of approximately 120 +/-
5% of nominal voltage output, the converter will
turn off. The input power to the converter or the
signal at the Inhibit pin must be recycled (connecting
and removing the Inhibit pin to/from Inhibit Return
pin) to turn on the converter. This event is possible
only if the converter shuts off due to a false triggering.
The OVP threshold voltage can also be reset to
within 115% to 125% of nominal output voltage
with two external resistors. Refer to the Application
Notes section of the data sheet on page 9.
Inhibit (On/Off Command) : 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 4V with respect to the inhibit return (Pin 4).
Output Voltage Adjustment: The output voltage
of all models can be adjusted greater or less than
the nominal output voltage using a single external
resistor. Refer to the Application Notes section of
the data sheet on page 9.
Should the input voltage drops below 16.5V to 14.5V
(defined as UVLO threshold), the converter will turn
off and remains off so long as the input voltage
remains under the UVLO threshold. The converter
will resume a normal operation when the input line
rises above the UVR threshold. However, the
converter can be configured to remain in a latch-up
mode if desired.
2 www.irf.com
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Part Number LSO2805S
Description HYBRID-HIGH RELIABILITY RADIATION HARDENED DC-DC CONVERTER
Maker IRF
Total Page 18 Pages
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