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PD - 94519A
L-SERIES
+ 28V Input, Single/Dual Output ADVANCED ANALOG HIGH RELIABILITY RADIATION TOLERANT DC/DC CONVERTERS
Description
The L-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 G-Series of DC/DC converters is recommended. Features include 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 and GSFC PPL-21 Appendix B. 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 1.5" x 2.3" x 0.425" steel package and weigh less than 85 grams. The package utilizes rugged ceramic feed-through copper core pins and is sealed using parallel seam welding. Full environmental screening includes temperature cycling, constant acceleration, fine and gross leak, and burn-in. Non-flight versions of the L-Series converters are available for system development purposes. Variations in electrical specifications and screening to meet custom requirements can be accommodated.
Features
n Total Dose > 25K Rad(Si) n SEE > 37 MeV.cm2/mg n Internal EMI filter; Converter Capable of meeting MIL-STD-461C CE03 and CS01 n Low Weight, < 85 grams n Magnetically Coupled Feedback n 16V to 50V DC Input Range n Up to 25W Output Power n Single and Dual Output Models Include 3.3, 5, 12, 15, 5, 12 and 15V n High Efficiency - to 82% n -55C to +125C Operating Temperature Range n 100M @ 500VDC Isolation n Under-Voltage Lockout n Short Circuit and Overload Protection n Output Over Voltage Limiter n Adjustable Output Voltage n External Inhibit n 1,500,000 Hour MTBF
Applications
n n Low Earth Orbit Satellites (LEO) Launch Vehicles
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08/20/02
L-SERIES
Circuit Description
The L-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. This mechanism limits the maximum output voltage to approximately 20% over the nominal regardless of the line voltage. An internal EMI filter allows the converter to meet the conducted emissions requirements of MIL-STD-461C on the input power leads. A single-stage output filter reduces the typical output ripple to less than 50mV 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 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). The output voltage of all models can be adjusted using a single external resistor.
Design Methodology
The L-Series was developed using a proven conservative design methodology which includes selecting radiation tolerance 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 opto-couplers 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 ).
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L-SERIES Absolute Maximum Ratings
Input voltage range Output power Lead temperature Operating temperature Storage temperature -0.5Vdc to +60Vdc Internally limited +300C for 10 seconds -55C to +135C -55C to +135C
Recommended Operating Conditions
Input voltage range Input voltage range1 Output power Operating temperature 2 Operating temperature1 1 2
16Vdc to +60Vdc 16Vdc to +38Vdc 0 to Max. Rated -55C to +125C -55C to +70C
Meets derating per MIL-STD-975 For operation at +125C see table note 13
Electrical Performance Characteristics
Group A Subgroup Conditions -55C TC +85C VIN = 28V DC 5%, CL = 0 unless otherwise specified Limits Min 18 1 1 1 1 1 1 1 2,3 2,3 2,3 2,3 2,3 2,3 2,3 1,2,3 IOUT = 100% rated load Note 4 3.27 4.95 11.88 14.85 4.95 11.88 14.85 3.23 4.90 11.76 14.70 4.90 11.76 14.70 0 0 0 0 0 0 0 0 0 -0.5 -1.0 Nom 28 3.30 5.00 12.00 15.00 5.00 12.00 15.00 Max 50 3.33 5.05 12.12 15.15 5.05 12.12 15.15 3.37 5.10 12.24 15.30 5.10 12.24 15.30 20 25 6.06 5.00 2.08 1.67 4.00 1.67 1.33 0.5 1.0 Unit V V V V V V V V V V V V V V V W W A A A A A A A % %
Parameter Input Voltage Output Voltage ( Vout ) M3L2803R3S M3L2805S M3L2812S M3L2815S M3L2805D M3L2812D M3L2815D M3L2803R3S M3L2805S M3L2812S M3L2815S M3L2805D M3L2812D M3L2815D Output power ( POUT ) M3L2803R3S All Others Output current ( IOUT ) M3L2803R3S M3L2805S M3L2812S M3L2815S M3L2805D M3L2812D M3L2815D Line regulation ( VRLINE ) Load regulation ( VRLOAD ) Cross regulation ( VRCROSS ) M3L2805D M3L2812D M3L2815D
IOUT = 100% rated load Note 4
VIN = 16, 28, 50 Volts, Note 2
1,2,3
VIN = 16, 28, 50 Volts, Note 2
Either Output, Note 3 Either Output, Note 3 Either Output, Note 3 1,2,3 1,2,3 VIN = 16, 28, 50 Volts IOUT = 0, 50%, 100% rated, Note 4 IOUT = 0, 50%, 100% rated, Note 4 VIN = 16, 28, 50 Volts VIN = 16, 28, 50 Volts Duals only, Note 5
1,2,3
-5.0 -3.0 -3.0
5.0 3.0 3.0
% % %
For Notes to Specifications, refer to page 5
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L-SERIES Electrical Performance Characteristics
Group A Subgroup 1,2,3
( continued )
Limits Min Nom Max 60 70 70 70 70 100 100 8 35 50 70 80 80 80 80 425 68 75 75 75 75 75 75 9.5 -0.5 500 75 79 80 81 79 79 80 11.5 500 50 130 575 Unit mA mA mA mA mA mA mA mA mV p-p mV p-p mV p-p mV p-p mV p-p mV p-p mV p-p KHz % % % % % % % V A V %
Parameter Input current, no load ( IIN ) M3L2803R3S M3L2805S M3L2812S M3L2815S M3L2805D M3L2812D M3L2815D Input current inhibited Output ripple ( V RIP ) M3L2803R3S M3L2805S M3L2812S M3L2815S M3L2805D M3L2812D M3L2815D Switching frequency ( FS ) Efficiency ( EFF ) M3L2803R3S M3L2805S M3L2812S M3L2815S M3L2805D M3L2812D M3L2815D Enable Input ( Inhibit Function ) open circuit voltage drive current ( sink ) voltage range Current Limit Point Expressed as a percentage of full rated load current Power dissipation, load fault (P D) Output response to step load changes (V TLD) Recovery time, step load changes (TTLD) Output response to step line changes (VTLN) Recovery Time, step line changes (TTLN) Turn-on Response Overshoot (VOS) Turn-on Delay (TDLY)
Conditions -55C TC +85C VIN = 28V DC 5%, CL = 0 unless otherwise specified IOUT = 0, Pin 4 open
1,2,3 1,2,3
Pin 4 shorted to pin 2 VIN = 16, 28, 50 Volts IOUT = 100% rated load Notes 4, 6
1,2,3 1,2,3
Sync. Input (Pin 4) open IOUT = 100% rated load Note 4
1,2,3
Note 1
1,2,3
Vout = 90% of Nominal, Note 4
105
1,2,3 4,5,6 4,5,6 4,5,6 4,5,6
Short Circuit, Overload, Note 8 Half Load to/from Full Load, Notes 4,9 Half Load to/from Full Load, Note 4,9,10 16V to/from 50V IOUT = 100% rated load, Notes 1,4,11 16V to/from 50V IOUT = 100% rated load, Notes 1,4,10,11 No Load, Full Load Notes 4,12 2 -300 -300
14 300 200 300 200
W mV pk S mV pk S
4,5,6
500 10
mV mS
For Notes to Specifications, refer to page 5
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L-SERIES Electrical Performance Characteristics
Group A Subgroup 1
( continued )
Parameter Capacitive Load (CL) M3L2803R3S M3L2805S M3L2812S M3L2815S M3L2805D M3L2812D M3L2815D Line Rejection Isolation Device Weight MTBF
Conditions -55C TC +85C VIN = 28V DC 5%, CL = 0 unless otherwise specified IOUT = 100% rated load No effect on DC performance Notes 1, 4, 7 Each output on duals
Limits 2200 1000 180 120 500 90 60 40 100 85 50
Unit F F F F F F F dB M grams Hours
1 1
IOUT = 100% rated load DC to 50KHz, Notes 1, 4 Input to Output or Any Pin to Case except pin 3, test @ 500VDC
MIL-HDBK-217F2, SF, 35C
1.5 x 10
6
Table I.
1) 2) 3) 4) 5) 6) 7)
Electrical Performance Characteristics - notes
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 Sec. 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 Sec. 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 +85C and +125C, derate the maximum output power linearly from 100% to 75%.
8) 9) 10) 11) 12) 13)
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L-SERIES Radiation Performance Characteristics
Highest Level Tested 60
Test Total Ionizing Dose ( Gamma )
Conditions MIL-STD-883, Method 1019 Operating bias applied during exposure, Full Rated Load, VIN = 28V Heavy ions (LET) Operating bias applied during exposure, Full Rated Load, VIN = 28V MIL-STD-883, Method 1023 Operating bias applied during exposure, Full Rated Load, VIN = 28V MIL-STD-883, Method 1017 E > 10MeV
Min 25
Typ 40
Unit KRads (Si) MeV*cm /mg
2
Single Event Effects SEU, SEL, SEGR, SEB Dose Rate ( Gamma Dot ) Temporary Saturation Survival Neutron Fluence Proton Fluence
37
82
82
1E8 1E10 3E12 TBD
1.5E9 8E12 N/A
Rads (Si)/sec Neutrons 2 /cm protons 2 /cm
Device Screening
Test Inspection Element Evaluation Nondestructive Bond Pull Internal Visual Temperature Cycling Constant Acceleration Electrical Method MIL-PRF-38534 class H equivalent with SEM MIL-STD-883, Method 2023 MIL-STD-883, Method 2017 MIL-STD-883, Method 1010 MIL-STD-883, Method 2001 (2k-g) In accordance with device specification MIL-STD-883, Method 1015 In accordance with device specification 160 Hours C A, Y1 axis only Condition
Burn-in Final Electrical ( Group A )
Seal Fine Leak Gross Leak External Visual MIL-STD-883, Method 1014 MIL-STD-883, Method 2009 A1 C
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L-SERIES
Vin 1 EMI FILTER 7 +OUTPUT
+10.5V INHIBIT 4 BIAS SUPPLY
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OUTPUT RETURN
RETURN
2
CASE GROUND
3 EA
+ -
5
OUTPUT ADJUST
PWM CONTROLLER RAMP GEN.
SAMPLE & HOLD
FEEDBACK TRIGGER
Block Diagram - Single Output
Vin 1 EMI FILTER 8 +OUTPUT
7
RETURN
+10.5V INHIBIT 4 BIAS SUPPLY 6 -OUTPUT
RETURN
2
CASE GROUND
3 EA
+ -
5
OUTPUT ADJUST
PWM CONTROLLER RAMP GEN.
SAMPLE & HOLD
FEEDBACK TRIGGER
Block Diagram - Dual Output
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L-SERIES
100 90 80 70 60 dB-uA CEO3 LIMIT 50 40 30 20 10 0 1E3 1E4 1E5 Frequency ( Hz ) 1E6 1E7 1E8
Conducted Emissions, Common Mode
100 90 80 70 60 dB-uA CEO3 LIMIT 50 40 30 20 10 0 1E3 1E4 1E5 Frequency ( Hz ) 1E6 1E7 1E8
Conducted Emissions, Normal Mode
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L-SERIES
0 -10 -20 -30 -40 dB -50 -60 -70 -80 -90 -100 1E2 1E3 Frequency ( Hz ) 1E4 1E5
M3L2805S Line Rejection (CS01)
0 -10 -20 -30 -40 dB -50 -60 -70 -80 -90 -100 1E2 1E3 Frequency ( Hz ) 1E4 1E5
M3L2815D Line Rejection (CS01)
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L-SERIES
0 -10 -20 -30 -40 dB -50 -60 -70 -80 -90 -100 1E2 1E3 Frequency ( Hz ) 1E4 1E5
M3L2815D Line Rejections (CS01)
50
50 C oax
1 F O s c illis c o p e o r E q u iv a le n t w ith 1 0 M H z B a n d w id th . M u ltip ly re a d in g s b y 2 . 50 T e rm in a tio n
0 .1 F
+ Vout
DUT
R e tu rn
R L fo r I R A T E D
Circuit for Measuring Output Ripple Voltage
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L-SERIES Mechanical Diagram
2.300 0.375 1.550 0.25 T yp. o 0.128 4 Plcs
0.050
8
0.470 1
0.270 0.400 7 1.500 1.750 2.000 1.000 R ef
0.400 2 2 Eq S paces @ 0.200
0.400 0.200
5
6
0.350
Pin Designation (Single/Dual)
Pin Number Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Single + Input Input Return Case Inhibit Output Adjust Output Return + Vout NC Dual + Input Input Return Case Inhibit Output Adjust - Vout Output Common + Vout Model
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331 ADVANCED ANALOG: 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. 02/03
3 4 0.850 2.80 R ef 0.250
Pin o 0.040 0.220
0.425 M ax
T o le ra n ce : .X X = 0 .0 1 .X X X = 0 .0 0 5
Part Number
M3L 28 05 S
Outputs Input Voltage
28 = 28V Nominal S = Single D = Dual
Output Voltage
03R3 = 3.3V, 05 = 5V 12 = 12V, 15 = 15V
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