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1、02/25/1ADVANCED ANALOGHIGH RELIABILITY RADIATIONTOLERANT DC/DC CONVERTERSH-SERIESDescription?Total Dose 25K Rad(Si)?SEE 37 MeV.cm2/mg?Internal EMI filter;Converter Capable of meeting MIL-STD-461C CE03 and CS01?Low Weight,125 grams?Magnetically Coupled Feedback?18V to 50V Input Range(50V,70V,and 120V
2、 Models Available)?Up to 40W Output Power?Single and Dual Output Models Include 3.3,5,5.2,12,15,5,12,15V?High Efficiency-to 82%?-55C to+125C Operating Temperature Range?100M 500VDC Isolation?Under-Voltage Lockout?Short Circuit and Overload Protection?Output Over Voltage Limiter?Adjustable Output Vol
3、tage?External Inhibit?1,500,000 Hour MTBFFeatures+28V Input,Single/Dual OutputThe H-Series of DC/DC converters are radiation toler-ant,high reliability devices designed for moderate ra-diation environments such as those encountered by lowearth orbit satellites and launch vehicles.For higherradiation
4、 environments,the G-Series of DC/DC con-verters is recommended.System upgrades to higherradiation tolerance applications can be easily accom-modated with the G-Series converters because theyhave the same mechanical outline and are pin compat-ible.For physically smaller,lower output power singleand d
5、ual output applications the L-Series of DC/DC con-verters are recommended.Features of the H-Series in-clude up to 40 watt output power,small size,low weightand a high tolerance to total ionizing dose,single eventeffects and environmental stresses such as tempera-ture extremes,mechanical shock,and vi
6、bration.All com-ponents are fully derated to meet the requirements ofMIL-STD-975 and MIL-STD-1547.Extensive documen-tation including Radiation Susceptibility,Thermal Analy-sis,Stress Analysis and MTBF are available.The converters incorporate a fixed frequency single for-ward topology with magnetic f
7、eedback and an internalEMI filter.These converters are capable of meeting theconducted emissions and conducted susceptibility re-quirements of MIL-STD-461C without any additionalcomponents.All models include an external inhibit portand have an adjustable output voltage.They are en-closed in a hermet
8、ic 3.0 x 2.5 x 0.445 steel packageand weigh less than 125 grams.The package utilizesrugged ceramic feed-through copper core pins and issealed using parallel seam welding.Full environmental screening includes temperature cy-cling,constant acceleration,fine and gross leak,andburn-in.Non-flight version
9、s of the H-Series converters are avail-able for system development purposes.Variations inelectrical specifications and screening to meetcustom requirements can be accommodated.Applications?Low Earth Orbit Satellites(LEO)?Launch VehiclesPD-94437AH-SERIESThe H-Series converters utilize a single forwar
10、d to-pology with resonant reset.The nominal switchingfrequency is 500kHz.Electrical isolation and tightoutput regulation are achieved through the use of amagnetically coupled feedback.Voltage feed-forwardwith duty factor limiting provides high line rejectionand protection against output over voltage
11、 in theevent of an internal control loop failure.This mecha-nism limits the maximum output voltage to approxi-mately 20%over the nominal regardless of the linevoltage.Circuit DescriptionAn internal EMI filter allows the converter to meet theconducted emissions requirements of MIL-STD-461Con the inpu
12、t power leads.A two-stage output filterreduces the typical output ripple to less than 20mVpeak-to-peak.Output current is limited under any load fault condi-tion to approximately 125%of rated.An overloadcondition causes the converter output to behave likea constant current source with the output volt
13、age drop-ping below nominal.The converter will resume nor-mal operation when the load current is reduced be-low the current limit point.This protects the converterfrom both overload and short circuit conditions.Thecurrent limit point exhibits a slightly negative tem-perature coefficient to reduce th
14、e possibility of ther-mal runaway.An under-voltage lockout circuit prohibits the con-verter from operating when the line voltage is too lowto maintain the output voltage.The converter will notstart until the line voltage rises to approximately 17volts and will shut down when the input voltage dropsb
15、elow 16 volts.The one volt of hysteresis reducesthe possibility of line noise interfering with theconverters start-up and shut down.An external inhibit port is provided to control con-verter operation.The converters operation is inhib-ited when this pin is pulled low.It is intended to bedriven by an
16、 open collector logic device.The pinmay be left open for normal operation and has anominal open circuit voltage of 10.5V with respect tothe input return(pin 2).Single output models feature remote sense to auto-matically correct for voltage drops between the con-verter output anf the load.The output
17、voltage of dualoutput models can be adjusted using a single exter-nal resistor.Design MethodologyThe H-Series was developed using a proven con-servative design methodology which includes se-lecting radiation tolerant and established reliabilitycomponents and fully derating to the requirementsof MIL-
18、STD-975 and MIL-STD-1547.Heavy derat-ing of the power MOSFET gate and drain voltagesminimize the possibility of SEGR and SEB.A mag-netic feedback circuit is utilized instead of opto-cou-plers to minimize temperature,radiation and agingsensitivity.PSPICE was used extensively to predictand optimize ci
19、rcuit performance for both beginningand end-of-life.Thorough design analyses includeRadiation Susceptibility(TREE),Stress,Thermal,and Reliability(MTBF)3H-SERIESInput voltage range-0.5Vdc to+60Vdc Input voltage range-18Vdc to+40VdcOutput power-Internally limited Input voltage range1-18Vdc to+38VdcLea
20、d temperature-+300C for 10 seconds Output power-0 to Max.RatedOperating temperature-55C to+135C Operating temperature2-55C to+125CStorage temperature-55C to+135C Operating temperature1-55C to+70C1 Meets derating per MIL-STD-975 2For operation at+125C see table note 13Absolute Maximum RatingsRecommen
21、ded Operating ConditionsElectrical Performance CharacteristicsFor Notes to Specifications,refer to page 5?!?#?$?%?&?(?)?*?*?+?,?%?-?.$?/?%?0?1?*23?$242?*23?$?*23?$?4?*23?-?*23?-?*23?$?*23?-?*23?-?*23?$242?*23?$?*23?$?4?*23?-?*23?-?*23?$?*23?-?*23?-?-?-?-?-?-?-?-?-?#2?#2?#2?#2?#2?#2?#2?#2?/,?-$?%?.?/
22、,?-$?%?.?25?6?.57?5-6?-5?-.5?!.57?!-5?!-.5?25?2?.57$?5-2?-568?-.56$?!.57$?!-568?!-.56$?252$?5$?5?$?-?5$?-?5$?!?5$?!-?5$?!-?5$?2522?5$?5?2?-?5-?-?5-?!?5$?!-?5-?!-?5-?2526?5-$?5?6?-?5?.?-?52$?!?5-$?!-?5?.?!-?52$?/?0?/,?1?*23?$242?%?/?&?-#?#2?-?#?#?.$?%?#?$?$?2$?.$?9?9?/?(?0?/,?1?*23?$242?*23?$?*23?$?4
23、?*23?-?*23?-?*23?$?*23?-?*23?-?-#?#2?-?#?#?.$?%?#?:?&?/?#?2?:?&?/?#?2?:?&?/?#?2?$?$?$?$?$?$?$?$?75-$?5$?656$?252.?586?85.$?586?5-.?%?0?4?:?1?-#?#2?-?#?#?.$?%?/,?$#?$#?-$?#?.?$5?$5?%?0?4?/?1?-#?#2?/,?$#?$#?-$?#?.?-?#?#?.$?%?-5$?-5$?%?0?4?4/?1?*23?$?*23?-?*23?-?-#?#2?%?%;#?-?#?#?.$?%?5$?25$?25$?5$?25$
24、?25$?H-SERIESElectrical Performance Characteristics(continued)For Notes to Specifications,refer to page 5?!?#?$?%?&?(?)?*?*?+?,?/?4?%?0?1?*23?$242?*23?$?*23?$?4?*23?-?*23?-?*23?$?*23?-?*23?-?-#?#2?-?#?#?.$?%?/,?-$?%?.#?8?2?$?$?6$?$?$?$?$?(?#?%?0?1?*23?$242?*23?$?*23?$?4?*23?-?*23?-?*23?$?*23?-?*23?-
25、?-#?#2?/,?$#?.?8$?6$?6$?6$?6$?6$?-$?-$?(?&?-#?#2?.?&?(&?)?3?:)?(?(;?0?:=?1?*23?$242?*23?$?*23?$?4?*23?-?*23?-?*23?$?*23?-?*23?-?-#?#2?/,?-$?%?.?8?66?66?6?6?66?6?6?62?$?$?-?$?-?:?%?0?&?=?(?1?(?(?%?(?0?A?1?%?-#?#2?-?75?$5?-5?$?$?:+?(?)?)?%?%?(?-#?#2?7$?)?%#?.?-$?-2$?#?%?)?%?0?1?-#?#2?&?(?#?/?%?#?-?9?/
26、?%?(&?0?1?.#?#8?3?%)?B)?=?%?#?.#7?2$?2$?A?4?(?;?#?%?(&?0?1?.#?#8?3?%)?B)?=?%?#?.#7#-$?$?/?%?(&?0?1?.#?#8?-?B)?.$?/,?-$?%?#?-#.#-?2$?2$?A?4?(?;?#?%?(&?0?1?.#?#8?-?B)?.$?/,?-$?%?#?-#.#-$#-?$?4?/?&?0?/?1?%?;?0?C1?.#?#8?#?=?%?.#-?$?-$?5H-SERIESElectrical Performance Characteristics(continued)Table I.Ele
27、ctrical Performance Characteristics -notes1)Parameter is tested as part of design characterization or after design changes.Thereafter,parameter shall be guaranteed to thelimits specified.2)Parameter verified during line and load regulation tests.3)Output load current must be distributed such that at
28、 least 20%of the total load current is being provided by one of the outputs.4)Load current split equally between outputs on dual output models.5)Cross regulation is measured with 20%rated load on output under test while changing the load on the other output from 20%to 80%of rated.6)Guaranteed for a
29、D.C.to 20MHz bandwidth.Tested using a 20KHz to 10MHz bandwidth using the circuit shown below.7)Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.A capacitive load in excessof the maximum limit may interfere with the proper operation of the converters ov
30、erload protection,causing erratic behavior duringturn-on.8)Overload power dissipation is defined as the device power dissipation with the load set such that VOUT=90%of nominal.9)Load step transition time 10 Sec.10)Recovery time is measured from the initiation of the transient to where VOUT has retur
31、ned to within 1%ofits steady state value.11)Line step transition time 100 Sec.12)Turn-on delay time from either a step application of input power or a logic low to a logic high transition on the inhibit pin(pin 4)tothe point where VOUT=90%of nominal.13)For operation at temperatures between+85C and+1
32、25C,derate the maximum output power linearly from 100%to 75%.?*?#?$?,?%?&?(?)?*?*?+?,?(?0?1?*23?$242?*23?$?*23?$?4?*23?-?*23?-?*23?$?*23?-?*23?-?-?/,?-$?%?)?(?)?(?-#?.#?6?:?(&?%?$?-$?-$?-?$?-?$?$?7$?8$?D=?D=?D=?D=?D=?D=?D=?D=?4?E?(?-?/,?-$?%?$3?#?-#?.?.$?$?F?%?-?/?;?+(?2#?G?$?-$?*?(?9?&?-?*?F=?*?3 F
33、?-6=?#?=#?2?-5?+?-$8?3?H-SERIESRadiation Performance CharacteristicsDevice Screening Test Conditions Min Typ Highest Level Tested Unit Total Ionizing Dose(Gamma)MIL-STD-883,Method 1019 Operating bias applied during exposure,Full Rated Load,VIN=28V 25 40 60 Krads(Si)Single Event Effects SEU,SEL,SEGR,
34、SEB Heavy ions(LET)Operating bias applied during exposure,Full Rated Load,VIN=28V 37 82 82 MeVcm2/mg Dose Rate(Gamma Dot)Temporary Saturation Survival MIL-STD-883,Method 1023 Operating bias applied during exposure,Full Rated Load,VIN=28V 1E8 1E10 1.5E9 Rads(Si)/sec Neutron Fluence MIL-STD-883,Method
35、 1017 3E12 8E12 Neutrons/cm2 Proton Fluence E 10MeV TBD N/A protons/cm2 Test Inspection Method Condition Element Evaluation MIL-PRF-38534 class H equivalent with SEM Nondestructive Bond Pull MIL-STD-883,Method 2023 Internal Visual MIL-STD-883,Method 2017 Temperature Cycling MIL-STD-883,Method 1010 C
36、 Constant Acceleration MIL-STD-883,Method 2001(2k-g)A,Y1 axis only Electrical In accordance with device specification Burn-in MIL-STD-883,Method 1015 160 Hours Final Electrical(Group A)In accordance with device specification Seal Fine Leak Gross Leak MIL-STD-883,Method 1014 A1 C External Visual MIL-
37、STD-883,Method 2009 7H-SERIESBlock Diagram -Single OutputRSEA+-+-SENSE10+SENSE9RETURN+OUTPUT121312VinRETURNBIASSUPPLYEMIFILTER+10.5VSAMPLE&HOLDFEEDBACKTRIGGERRAMPGEN.PWMCONTROLLER3INHIBITUNDER VOLTAGELOCKOUT&INHIBIT6CASEGROUND2 Sync.Output(for Test use only)Block Diagram -Dual OutputADJUST8EA+-12Vin
38、RETURNBIASSUPPLYEMIFILTER+10.5VSAMPLE&HOLDFEEDBACKTRIGGERRAMPGEN.PWMCONTROLLER3INHIBITUNDER VOLTAGELOCKOUT&INHIBIT6CASEGROUN2tputse only)1211+OUTPRETUR13-OUTPUH-SERIES0 10 20 30 40 50 60 70 80 90 100 dB-uA1E31E41E51E61E71E8Frequency(Hz)CEO3 LIMIT0 10 20 30 40 50 60 70 80 90 100 dB-uA1E31E41E51E61E71
39、E8Frequency(Hz)CEO3 LIMITConducted Emmissions,Common ModeConducted Emmissions,Normal M9H-SERIES-120-100-80-60-40-20 0 dB1E21E31E41E5Frequency(Hz)FullRatedLoadOUTPUTRETURNDUT50 ohm Back Term.0.1 uF50 ohm Coax.50 ohm Term.1 uFOscilloscope or Equivalentwith 10 MHz Bandwidth.Multiply readings by 2.Note:
40、Specification guaranteedto 20MHz Bandwidth.Circuit for Measuring Output Ripple VoltageLine Rejections,28Vdc+8Vac-H-SERIESWORLD HEADQUARTERS:233 Kansas St.,El Segundo,California 90245,Tel:(310)322 3331ADVANCED ANALOG:2270 Martin Av.,Santa Clara,California 95050,Tel:(408)727-0500Visit us at for sales
41、contact information.Data and specifications subject to change without notice.02/033.000.5002.0000.4501.1002.5002.3000.200 Typ.Non-cum.0.3001.400 Ref.3.50Ref.0.445 Max0.080Max.0.260 Pin0.040R0.06254 places0.5000.6000.200Tolerance:.XX 0.01 .XXX 0.005123451213111098760.253.002.000Mechanical DiagramPin
42、Designation(Single/Dual)Part NumberPin Signal Pin Signal Pin 1+V Input Pin 8 NC/Adjust Pin 2 Input Return Pin 9-Sense/NC Pin 3 Inhibit Pin 10+Sense/NC Pin 4 NC Pin 11 NC/-Output Pin 5 Sync.Output(T.P.)Pin 12 Output Return Pin 6 Case Ground Pin 13+Output Pin 7 NC M3H 28 05 SModelNominal InputVoltage28=28VOutputsS=SingleD=DualNominal Output Voltages03R3=3.3V,05R2=5.2V05=5V,12=12V,15=15V