PD-94437D M3H-SERIES HYBRID - HIGH RELIABILITY RADIATION TOLERANT DC/DC CONVERTER +28V Input, Single/Dual Output Description The M3H-Series of DC/DC converters are radiation tolerant, high reliability devices designed for moderate radiation environments such as those encountered by low earth orbit satellites and launch vehicles. For higher radiation environments, the M3G-Series of DC/DC converters is recommended. System upgrades to higher radiation tolerance applications can be easily accommodated with the M3G-Series converters because they have the same mechanical outline and are pin compatible. For physically smaller, lower output power single and dual output applications the M3L-Series of DC/DC converters are recommended. Features of the M3H-Series include up to 40 watt output power, small size, low weight and a high tolerance to total ionizing dose, single event effects and environmental stresses such as temperature extremes, mechanical shock, and vibration. All components are fully derated to meet the requirements of MIL-STD-975 and MIL-STD-1547. Extensive documentation including Radiation Susceptibility, Thermal Analysis, Stress Analysis and MTBF are available. The 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 and conducted susceptibility requirements of MIL-STD-461C without any additional components. All models include an external inhibit port and have an adjustable output voltage. They are enclosed in a hermetic 3.0" x 2.5" x 0.445" 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-PRF38534, these converters are fabricated utilizing DSCC qualified processes. For available screening options, refer to device screening table in the data sheet. www.irf.com M3H Features n Total Dose > 25K Rad(Si) n SEE Hardened to LET up to 37 MeV.cm2/mg n Internal EMI filter; Converter Capable of meeting MIL-STD-461C CE03 and CS01 n Low Weight, < 125 grams n Magnetically Coupled Feedback n 18V to 50V Input Range ( 50V, 70V, and 120V Models Available) n Up to 40W Output Power n Single and Dual Output Models Include 3.3, 5, 5.2, 12, 15, ±5, ±12, ±15V n High Efficiency - to 82% n -55°C to +125°C Operating Temperature Range n 100MΩ @ 500VDC Isolation n Under-Voltage Lockout n Short Circuit and Overload Protection n Adjustable Output Voltage n External Inhibit n 1,500,000 Hour MTBF Applications n n Low Earth Orbit Satellites (LEO) Launch Vehicles Non-flight versions of the M3H-Series converters are available for system development purposes. Variations in electrical specifications and screening to meet custom requirements can be accommodated. Consult IR Santa Clara for special requirements. 1 09/8/06 M3H-SERIES Circuit Description The M3H-Series converters utilize a single 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 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. A two-stage output filter reduces the typical output ripple to less than 20mV peak-to-peak. Output current is limited under any load fault condition to approximately 125% of rated. An overload condition causes the converter output to behave like a constant current source with the output voltage dropping 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. An under-voltage lockout circuit prohibits the converter from operating when the line voltage is too low to maintain the output voltage. The converter will not start until the line voltage rises to approximately 17 volts and will shut down when the input voltage drops below 16 volts. The one volt of hysteresis reduces the possibility of line noise interfering with the converter’s start-up and shut down. 2 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 10.5V with respect to the input return (pin 2). Single output models feature remote sense to automatically correct for voltage drops between the converter output anf the load. The output voltage of dual output models can be adjusted using a single external resistor. Design Methodology The M3H-Series was developed using a proven conservative design methodology which includes selecting radiation tolerant and established reliability components and fully derating to the requirements of MIL-STD-975 and MIL-STD-1547. Heavy derating of the power MOSFET gate and drain voltages minimize the possibility of SEGR and SEB. A magnetic feedback circuit is utilized instead of optocouplers to minimize temperature, radiation and aging sensitivity. PSPICE was used extensively to predict and optimize circuit performance for both beginning and end-of-life. Thorough design analyses include Radiation Susceptibility ( TREE ), Stress, Thermal, and Reliability ( MTBF ). www.irf.com M3H-SERIES Specifications Absolute Maximum Ratings Recommended Operating Conditions Input voltage range Input voltage range -0.5Vdc to +60Vdc Output power Internally limited +18Vdc to +40Vdc 1 +18Vdc to +38Vdc Lead temperature Input voltage range +300°C for 10 seconds Output power Operating temperature -55°C to +135°C Operating temperature 2 -55°C to +125°C Storage temperature -55°C to +135°C Operating temperature 1 -55°C to +70°C 1 0 to Max. Rated Meets derating per MIL-STD-975 For operation at +125°C see table note 13 2 Electrical Performance Characteristics Parameter Group A Subgroup Conditions -55°C ≤ TC ≤ +85°C VIN = 28V DC ± 5%, CL = 0 unless otherwise specified Input Voltage Output Voltage ( Vout ) M3H2803R3S M3H2805S M3H2805R2S M3H2812S M3H2815S M3H2805D M3H2812D M3H2815D M3H2803R3S M3H2805S M3H2805R2S M3H2812S M3H2815S M3H2805D M3H2812D M3H2815D Output power ( POUT ) M3H2803R3S All Others Output current ( IOUT ) M3H2803R3S M3H2805S M3H2805R2S M3H2812S M3H2815S M3H2805D M3H2812D M3H2815D Min Nom Max Unit 18 28 40 V 3.30 5.00 5.20 12.00 15.00 ±5.00 ±12.00 ±15.00 3.33 5.05 5.23 12.12 15.15 ±5.05 ±12.12 ±15.15 1 1 1 1 1 1 1 1 IOUT = 100% rated load Note 4 3.27 4.95 5.17 11.88 14.85 ±4.95 ±11.88 ±14.85 2,3 2,3 2,3 2,3 2,3 2,3 2,3 2,3 IOUT = 100% rated load Note 4 3.23 4.90 5.13 11.76 14.70 ±4.90 ±11.76 ±14.70 3.37 5.10 5.27 12.24 15.30 ±5.10 ±12.24 ±15.30 V 1,2,3 VIN = 18, 28, 40 Volts, Note 2 0 0 30 40 W 1,2,3 VIN = 18, 28, 40 Volts, Note 2 0 0 0 0 0 0 0 0 9.10 8.00 7.70 3.34 2.67 6.40 2.67 2.14 -0.5 0.5 % -1.0 1.0 % -5.0 -3.0 -3.0 5.0 3.0 3.0 % Either Output, Note 3 Either Output, Note 3 Either Output, Note 3 Line regulation ( VRLINE ) 1,2,3 Load regulation ( VRLOAD ) 1,2,3 Cross regulation ( VRCROSS ) M3H2805D M3H2812D M3H2815D Limits VIN = 18, 28, 40 Volts IOUT = 0, 50%, 100% rated, Note 4 IOUT = 0, 50%, 100% rated, Note 4 VIN = 18, 28, 40 Volts 1,2,3 Duals only, Note 5 VIN = 18, 28, 40 Volts A For Notes to Specifications, refer to page 5 www.irf.com 3 M3H-SERIES Electrical Performance Characteristics Parameter Output Ripple ( Vrip) M3H2803R3S M3H2805S M3H2805R2S M3H2812S M3H2815S M3H2805D M3H2812D M3H2815D Group A Subgrou p 1,2,3 Switching frequency ( FS ) 1,2,3 Efficiency ( EFF ) M3H2803R3S M3H2805S M3H2805R2S M3H2812S M3H2815S M3H2805D M3H2812D M3H2815D Enable Input ( Inhibit Function ) open circuit voltage drive current ( sink ) voltage range Conditions -55°C ≤ TC ≤ +85°C VIN = 28V DC ± 5%, CL = 0 unless otherwise specified 1,2,3 Input current, no load ( IIN ) M3H2803R3S M3H2805S 125 M3H2805R2S M3H2812S M3H2815S M3H2805D M3H2812D M3H2815D Input current inhibited ( continued ) Limits Min Nom VIN = 18, 28, 40 Volts IOUT = 100% rated load Notes 4, 6 1,2,3 35 50 50 70 80 80 80 80 IOUT = 0, Pin 4 open Pin 4 shorted to pin 2 1,2,3 IOUT = 100% rated load Note 4 1,2,3 Note 1 Max 450 500 68 76 77 78 78 77 78 78 73 80 80 81 82 80 81 82 Unit mV p-p 60 70 70 70 70 70 100 100 8.0 mA 550 KHz mA % -0.5 11.5 500 50 V µA V 105 130 % 22 18 W 300 mV pk 200 µs 300 mV pk 200 µs 9.5 Current Limit Point Expressed as a percentage of full rated load current 1,2,3 Vout = 90% of Nominal, Note 4 Power dissipation, load fault (PD) M3H2815D All others 1,2,3 Short Circuit, Overload, Note 8 Output response to step load changes (VTLD) 4,5,6 Half Load to/from Full Load, Notes 4,9 Recovery time, step load changes (TTLD) 4,5,6 Half Load to/from Full Load, Note 4,9,10 Output response to step line changes (VTLN) 4,5,6 18V to/from 40V IOUT = 100% rated load, Notes 1,4,11 Recovery time, step line changes (TTLN) 4,5,6 18V to/from 40V IOUT = 100% rated load, Notes 1,4,10,11 4,5,6 No Load, Full Load for Dual Notes 4,12 2.0 10 10 % ms 20 % Load, Full Load for Single Notes 4,12 2.0 10 10 % ms Turn-on Response Overshoot (VOS) Turn-on Delay (TDLY) Overshoot (VOS) Turn-on Delay (TDLY) 4,5,6 -300 -300 For Notes to Specifications, refer to page 5 4 www.irf.com M3H-SERIES Electrical Performance Characteristics ( continued ) Conditions -55°C ≤ TC ≤ +85°C Parameter Capacitive Load (CL) M3H2803R3S M3H2805S M3H2005R2S M3H2812S M3H2815S M3H2805D M3H2812D M3H2815D Group A VIN = 28V DC ± 5%, CL =0 Subgroup Unless otherwise specified 1 IOUT = 100% rated load No effect on DC performance Notes 1, 4, 7 Limits Min 1 Isolation 1 IOUT = 100% rated load DC to 50KHz, Notes 1, 4 Input to Output or Any Pin to Case except pin 3, test @ 500VDC 40 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) 50 1.5 x 106 µF MΩ 125 MIL-HDBK-217F2, SF, 35°C Unit dB 100 Device Weight Notes. Max 2200 1000 1000 180 120 500 90 60 Each output on duals Line Rejection MTBF Nom g Hr Electrical Performance Characteristics Parameter is tested as part of design characterization or after design changes. Thereafter, parameter shall be guaranteed to the limits specified. Parameter verified during line and load regulation tests. Output load current must be distributed such that at least 20% of the total load current is being provided by one of the outputs. Load current split equally between outputs on dual output models. 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. Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth using the circuit shown below. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit may interfere with the proper operation of the converter’s overload protection, causing erratic behavior during turn-on. Overload power dissipation is defined as the device power dissipation with the load set such that VOUT = 90% of nominal. Load step transition time ≤ 10 µs. Recovery time is measured from the initiation of the transient to where VOUT has returned to within ±1% of its steady state value. Line step transition time ≤ 100 µs. 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) to the point where VOUT = 90% of nominal. For operation at temperatures between +85°C and +125°C, derate the maximum output power linearly from 100% to 75%. www.irf.com 5 M3H-SERIES Circuit for Measuring Output Ripple Voltage 50 ohm Back Term. OUTPUT 1 uF 50 ohm Coax. Oscilloscope or Equivalent with 10 MHz Bandwidth. 50 ohm Multiply readings by 2. Term. Note : Specification guaranteed to 20MHz Bandwidth. 0.1 uF DUT RETURN Full Rated Load Radiation Performance Characteristics Conditions Min Typ Highest Level Tested 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, SEB Heavy ions (LET) Operating bias applied during exposure, Full Rated Load, VIN = 28V 37 82 82 MeV•cm /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 1017 3E12 8E12 Neutrons 2 /cm Proton Fluence E > 10MeV TBD N/A protons 2 /cm Test Unit 2 International Rectifier currently does not have a DSCC certified Radiation Hardness Assurance Program. 6 www.irf.com M3H-SERIES Figure 1. Block Diagram - Single Output Vin 1 EMI FILTER +10.5V UVLO & INHIBIT INHIBIT 3 BIAS SUPPLY 13 +OUTPUT 12 RETURN 10 +SENSE 9 -SENSE 6 CASE GROUND 13 +OUTPUT 12 RETURN 11 -OUTPUT 8 ADJUST 6 CASE GROUND RETURN 2 + + EA RAMP GEN PWM CONTROLLER RS - - SAMPLE & HOLD Sync. Output 5 ( for Test use only ) FEEDBACK TRIGGER Figure 2. Block Diagram - Dual Output Vin 1 EMI FILTER +10.5V INHIBIT 3 RETURN UVLO & INHIBIT BIAS SUPPLY 2 EA RAMP GEN Sync. Output ( for Test use only ) 5 www.irf.com PWM CONTROLLER SAMPLE & HOLD FEEDBACK TRIGGER 7 M3H-SERIES Figure 3. Conducted Emmissions, Common Mode 100 90 80 70 dB-uA 60 CEO3 LIMIT 50 40 30 20 10 0 1E3 1E4 1E5 Frequency ( Hz ) 1E6 1E7 1E8 Figure 4. Conducted Emmissions, Normal Mode 100 90 80 70 dB-uA 60 CEO3 LIMIT 50 40 30 20 10 0 1E3 1E4 1E5 1E6 1E7 1E8 Frequency ( Hz ) 8 www.irf.com M3H-SERIES Figure 5. Line Rejections, 28Vdc + 8Vac-p 0 -20 dB -40 -60 -80 -100 -120 1E2 www.irf.com 1E3 Frequency ( Hz ) 1E4 1E5 9 M3H-SERIES Mechanical Outline 3.00 0.500 0.080 Max. 2.000 R0.0625 4 places 0.300 0.500 0.200 13 1 12 2 11 10 0.600 9 3 8 4 7 5 6 2.000 2.300 2.500 0.200 Typ. Non-cum. 1.400 Ref. Pin Ø0.040 0.450 1.100 0.260 3.50 Ref. 0.25 Tolerance : .XX ±0.01 .XXX ±0.005 0.445 Max Pin Designation (Single/Dual) Pin # 10 Single Pin # Dual 1 + Input 1 + Input 2 Input Return 2 Input Return 3 Inhibit 3 Inhibit 4 NC 4 NC 5 Sync. Output (T.P.) 5 Sync. Output (T.P.) 6 Case Ground 6 Case Ground 7 NC 7 NC 8 NC 8 Adjust 9 - Sense 9 NC 10 + Sense 10 NC 11 NC 11 - Output 12 13 Output Return + Output 12 13 Output Return + Output www.irf.com M3H-SERIES Device Screening Requirement MIL-STD-883 Method No Suffix EM -55°C to +85°C -55°C to +85°C Element Evaluation MIL-PRF-38534 Class H w/SEM N/A Non-Destructive Bond Pull 2023 Yes N/A Temperature Range Internal Visual 2017 Yes c Temperature Cycle 1010 Cond C Cond C Constant Acceleration 2001, Y1 Axis 3000 Gs 3000 Gs PIND 2020 N/A N/A Burn-In 1015 160 hrs @ 125°C 48 hrs @ 125°C Final Electrical MIL-PRF-38534 -55°C, +25°C, -55°C, +25°C, ( Group A ) & Specification +85°C +85°C PDA MIL-PRF-38534 N/A N/A Seal, Fine and Gross 1014 A1, C Cond A Radiographic 2012 N/A N/A External Visual 2009 Yes c Notes: c Best commercial practice. International Rectifier currently does not have a DSCC certified Radiation Hardness Assurance Program Part Numbering M3H 28 05 S /EM Model Input Voltage Nominal 28 = 28V Output Voltage 03R3 = 3.3V, 05 = 5V 12 = 12V, 15 = 15V Screening Level (Please refer to Screening Table) No suffix, EM Output S = Single D = Dual WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105 IR SANTA CLARA: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500 Visit us at www.irf.com for sales contact information. Data and specifications subject to change without notice. 09/2006 www.irf.com 11