HYBRID - HIGH RELIABILITY LS ... - Infineon Technologies

1 18 to 40V DC Input Range Total Ionization Dose > 100K Rad(Si) SEE Hardened to LET (Heavy Ions) up to 82 MeV cm2/mg (SEU, SEL, SEGB, SEGR) Internal EMI filter; Converter Capable of meeting MIL-STD-461C CE03 Low Weight, < 80 grams Magnetically Coupled Feedback Up to 30W Output Power Single and Dual Output Models Include , , , 5, 12, 15, 5, 12 and 15V high Efficiency - to 83% 100M @ 500 VDC Isolation Under-Voltage Protection Short Circuit and Overload Protection Adjustable Output Voltage External Inhibit > 4,000,000 Hour MTBF (SF)

2 Standard Microcircuit Drawings AvailableFeaturesThe LS-Series of DC-DC converters provide samemechanical outline, power ratings, for backward pincompatibility, to their lower radiation tolerant counterpartM3L and Military series ATS DC-DC converters. Thecommon platform design allows for similarity betweenmilitary and space system architectures. For higheroutput power applications the HM, M3H and M3G-Seriesof DC-DC converters are LS-Series of DC-DC converters are, high reliabilitydevices designed for hostile radiation hardenedenvironments.

3 The LS-Series provide up to 30 wattsoutput power, small size, low weight, integrated EMIfiltering and a high tolerance to environmental stressessuch as radiation, temperature extremes, mechanicalshock, and vibration. Extensive documentationincluding, thermal analysis, stress analysis and reliabilitypredictions are LS-Series of converters incorporate a fixedfrequency single forward topology with magneticfeedback and an internal EMI filter. These convertersare capable of meeting the conducted emissionsrequirements of MIL-STD-461C without any additionalcomponents.

4 All models include an external inhibit portand have an adjustable output voltage. They areenclosed in a hermetic " x " x " steel packageand weigh less than 80 grams. The package utilizesrugged ceramic feed-through copper core pins and issealed using parallel seam in electrical specifications and screening tomeet custom requirements can be accommodated. Geo Synchronous Satellite Low Earth Orbit Deep Space Probe Communication and Display Systems Payload and Experiment LVPSLS-SERIES28V Input, Single/Dual OutputHYBRID - high RELIABILITYRADIATION HARDENEDDC-DC CONVERTERM anufactured in a facility fully qualified to MIL-PRF-38534, these converters are fabricated utilizing DLALand and Maritime qualified processes.

5 For availablescreening options, refer to device screening table in thedata (28V Input, Single/Dual Output)The LS-Series converters utilize a single-endedforward topology with resonant reset. The nominalswitching frequency is 500kHz. Electrical isolationand tight output regulation are achieved through theuse of a magnetically coupled feedback. Voltagefeed-forward with duty factor limiting provides highline rejection and protection against output overvoltage in the event of an internal control loop DescriptionAn internal EMI filter allows the converter to meetthe conducted emissions requirements of MIL-STD-461C on the input power external inhibit port is provided to controlconverter operation.

6 The converter s operation isinhibited when this pin is pulled low. It is intendedto be driven by an open collector logic device. Thepin may be left open for normal operation and has anominal open circuit voltage of 11V with respect tothe input return (pin 2).Output current is limited under any load faultcondition to approximately 125% of rated. Anoverload condition causes the converter outputvoltage to drop below nominal. The converter willresume normal operation when the load current isreduced below the current limit point.

7 This protectsthe converter from both overload and short circuitconditions. The current limit point exhibits a slightlynegative temperature coefficient to reduce thepossibility of thermal LS-Series was developed using a provenconservative design methodology derived from otherspace level designs that includes selection ofestablished RELIABILITY components and fully de-rating to the requirements of MIL-STD-975 2 2gh 2 2 2 D2 2 2 2SH 2 2 2 2 E 2 2 2 2 IH F A magnetic feedback circuit is utilizedinstead of opto -couplers to minimize temperature,aging and radiation sensitivity.

8 PSPICE was usedextensively to predict and optimize circuitperformance for both beginning and design analyses include stress, thermal,and RELIABILITY (MTBF).The output voltage of all models can be adjustedusing a single external LS-SERIES(28V Input, Single/Dual Output)Electrical Performance CharacteristicsFor Notes to Electrical Performance Characteristics, refer to page 51. Input voltage rating is BOL. Input voltage range reduced to 20 to 40 VDC for Meets de-rating per MIL-STD-975 Limits Parameter Group A Subgroup Conditions -55 C TC +85 C VIN = 28V DC 5%, CL = 0 unless otherwise specified Min Nom Max Unit Input Voltage 18 28 40 V Output Voltage ( Vout )

9 LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S LS2805D LS2812D LS2815D LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S LS2805D LS2812D LS2815D 1 1 1 1 1 1 1 1 1 2,3 2,3 2,3 2,3 2,3 2,3 2,3 2,3 2,3 IOUT = 100% rated load Note 4 IOUT = 100% rated load Notes 4, 14 V V Output power ( POUT ) LS2801R5S LS2802R5S LS2803R3S All Others 1,2,3 VIN = 18, 28, 40 Volts, Note 2 0 0 0 0 12 20 25 30 W Output current ( IOUT ) LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S LS2805D LS2812D LS2815D 1,2,3 VIN = 18, 28, 40 Volts, Note 2 Either Output, Note 3 Either Output, Note 3 Either Output, Note 3 0 0 0 0 0 0 0 0 0 A Line regulation ( VRLINE ) 1,2,3 VIN = 18, 28, 40 Volts IOUT = 0, 50%, 100% rated, Note 4 % Load regulation ( VRLOAD )

10 LS2801R5S LS2802R5S All others 1,2,3 VIN = 18, 28, 40 Volts IOUT = 0, 50%, 100% rated, Note 4 % Cross regulation ( VRCROSS ) LS2805D LS2812D LS2815D 1,2,3 VIN = 18, 28, 40 Volts Duals only, Note 5 % Input voltage range to +60 Vdc Input voltage range1 +18 Vdc to +40 Vdc Output power Internally limited Output power 0 to Max. Rated Lead temperature +300 C for 10 seconds Operating case temperature -55 C to +85 C Operating case temperature -55 C to +125 C (Note 13) Operating case temperature2 -55 C to +70 C Storage temperature -55 C to +135 C Recommended Operating Conditions Absolute Maximum (28V Input, Single/Dual Output)Electrical Performance Characteristics ( continued )