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PD-96964
HIGH RELIABILITY DC/DC CONVERTER
Description
The LS-Series of DC/DC converters are, high reliability devices designed for hostile radiation hardened environments. The LS-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-975. Extensive documentation including, thermal analysis, stress analysis and reliability predictions are available. The LS-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. 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. The LS-Series of DC/DC converters provide same mechanical outline, power ratings, for backward pin compatibility, to their lower radiation tolerant counterpart M3L and Military series ATS DC/DC converters. The common platform design allows for similarity between military and space system architectures. For higher output power applications the HM, M3H and M3G-Series of DC/DC converters are recommended. All converters are manufactured in a facility certified to MIL-PRF-38534 Class (K). All processes used to manufacture the converters have been qualified to enable various levels of compliant devices. Full environmental screening includes temperature cycling, constant acceleration, fine and gross leak, PIND, radiographics and burn-in. Non-flight (EM-suffix) versions of the LS-Series converters are available for system development purposes. These devices are manufactured with the same generic active circuit elements but do not haveguaranteed radiation performance. Variations in electrical specifications and screening to meet custom requirements can be accommodated.
LS-SERIES
28V Input, Single/Dual Output
Features
n 18 to 40V DC Input Range n Total Ionization Dose > 100K Rad(Si) 2 n SEE LET (Heavy Ions) > 82 MeV*cm /mg (SEU, SEL, SEGB, SEGR) n Internal EMI filter; Converter Capable of meeting MIL-STD-461C CE03 n Low Weight, < 85 grams n Magnetically Coupled Feedback n Up to 30W Output Power n Single and Dual Output Models Include 1.5, 2.5, 3.3, 5, 12, 15, 5, 12 and 15V n High Efficiency - to 83% n 100M @ 500VDC Isolation n Under-Voltage Protection n Short Circuit and Overload Protection n Adjustable Output Voltage n External Inhibit n > 4,000,000 Hour MTBF (SF)
Applications
n n n n n Geo Synchronous Satellite Low Earth Orbit Deep Space Probe Communication and Display Systems Payload and Experiment LVPS
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01/05/06
LS-SERIES
Circuit Description
The LS-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. An internal EMI filter allows the converter to meet the conducted emissions requirements of MIL-STD461C on the input power leads. 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. 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 11V 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 LS-Series was developed using a proven conservative design methodology derived from other space level designs that includes selection of established reliability components and fully derating to the requirements of MIL-STD-975. A magnetic feedback circuit is utilized instead of opto -couplers to minimize temperature, aging and radiation sensitivity. PSPICE was used extensively to predict and optimize circuit performance for both beginning and end-of-life. Thorough design analyses include stress, thermal, and reliability (MTBF).
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LS-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 +125C (Note 13) -55C to +135C
Recommended Operating Conditions
Input voltage range1 Output power Operating temperature Operating temperature2 18Vdc to +40Vdc 0 to Max. Rated -55C to +85C -55C to +70C
1. Input voltage rating is BOL. Input voltage range reduced to 20 to 40VDC for EOL. 2. Meets de-rating per MIL-STD-975
Electrical Performance Characteristics
Parameter 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 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 1.47 2.47 3.27 4.95 11.88 14.85 4.95 11.88 14.85 1.43 2.43 3.23 4.90 11.76 14.70 4.90 11.76 14.70 0 0 0 0 0 0 0 0 0 0 0 0 0 -0.5 Nom 28 1.50 2.50 3.30 5.00 12.00 15.00 5.00 12.00 15.00 Max 40 1.53 2.53 3.33 5.05 12.12 15.15 5.05 12.12 15.15 1.57 2.57 3.37 5.10 12.24 15.30 5.10 12.24 15.30 12 20 25 30 8.0 8.0 7.57 6.0 2.5 2.0 4.8 2.3 1.6 0.5 Unit V
Input Voltage Output Voltage ( Vout ) LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S LS2805D LS2812D LS2815D LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S LS2805D LS2812D LS2815D Output power ( POUT ) LS2801R5S LS2802R5S LS2803R3S All Others Output current ( IOUT ) LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S LS2805D LS2812D LS2815D Line regulation ( VRLINE ) Load regulation ( VRLOAD ) LS2801R5S LS2802R5S All others Cross regulation ( VRCROSS ) LS2805D LS2812D LS2815D
V
IOUT = 100% rated load Notes 4, 14
V
1,2,3
VIN = 18, 28, 40 Volts, Note 2
W
1,2,3
VIN = 18, 28, 40 Volts, Note 2
A
Either Output, Note 3 Either Output, Note 3 Either Output, Note 3 1,2,3 VIN = 18, 28, 40 Volts IOUT = 0, 50%, 100% rated, Note 4 VIN = 18, 28, 40 Volts IOUT = 0, 50%, 100% rated, Note 4
%
1,2,3
-2.0 -1.2 -1.0 -5.0 -3.0 -3.0
2.0 1.2 1.0 5.0 3.0 3.0
%
1,2,3
VIN = 18, 28, 40 Volts Duals only, Note 5
%
For Notes to Electrical Performance Characteristics, refer to page 5
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LS-SERIES
Electrical Performance Characteristics
Parameter Input Current, no load ( IIN) LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S LS2805D LS2812D LS2815D Input current inhibited Output Ripple, ( VRIP) LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S LS2805D LS2812D LS2815D Switching frequency ( FS ) Efficiency ( EFF ) LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S LS2805D LS2812D LS2815D 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 (PD) Output response to step load changes (VTLD) Recovery time, step load changes (TTLD) Output response to step line changes (VTLN) Recovery Time, step line changes (TTLN) 1,2,3 Group A Subgroup
( continued )
Limits Min Nom Max 60 60 60 70 70 70 70 100 100 8.0 35 35 35 50 70 80 80 80 80 425 500 64 72 76 82 82 82 83 83 83 12 5.0 50 145 575 Unit
Conditions -55C TC +85C VIN = 28V DC 5%, CL = 0 unless otherwise specified IOUT = 0, Pin 4 open
1,2,3
mA
1,2,3 1,2,3
Pin 4 shorted to pin 2 VIN = 18, 28, 40 Volts IOUT = 100% rated load Notes 4, 6
mA
mV p-p
1,2,3 1,2,3 IOUT = 100% rated load Note 4
KHz
61 68 72 78 78 78 79 79 79 9.5 -0.5
%
Note 1
V mA V %
Vout = 90% of Nominal, Note 4
105
1,2,3 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 18V to/from 40V IOUT = 100% rated load, Notes 1,4,11 18V to/from 40V IOUT = 100% rated load, Notes 1,4,10,11 -300 -300
14 300 200 300 200
W mV pk s mV pk s
For Notes to Electrical Performance Characteristics, refer to page 5
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LS-SERIES
Electrical Performance Characteristics
Parameter Turn-on Overshoot (VOS) LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S LS2805D LS2812D LS2815D Turn-on Delay (TDLY) Capacitive Load (CL) LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S LS2805D LS2812D LS2815D Line Rejection Isolation Device Weight MTBF MIL-HDBK-217F2, SF, 35C 4.0 x 10
6
( continued )
Limits Min Nom Max 150 250 330 500 1000 1000 500 1000 1000 10 35 35 35 50 70 80 80 80 80 Unit
Group A Subgroup
Conditions -55C TC +85C VIN = 28V DC 5%, CL = 0 unless otherwise specified 10% Load, Full Load Notes 4,12
4,5,6
mV
0 IOUT = 100% rated load No effect on DC performance Notes 1, 4, 7 Nom Each output on duals Max
ms
F
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
35 100
50
dB M 85 g Hours
Notes for Electrical Performance Characteristics Table
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 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 on page 6. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. For a capacitive load in excess of the maximum limit, consult the factory. Overload power dissipation is defined as the device power dissipation with the load set such that V OUT = 90% of nominal. Load step transition time 10 Sec. Recovery time is measured from the initiation of the transient to where V OUT 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, de-rate the maximum output power linearly from 100% to 75%. End of life (EOL) is 3%
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LS-SERIES
Circuit for Measuring Output Ripple Voltage
50 50 Coax 1 F Oscilliscope or equivalent with 10 MHz bandwidth, multiply readings by 2. 50 Termination
0.1 F
+ Vout
DUT
Return
RL for IRATED
Radiation Performance Characterstics
Test 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
Min
Typ
Highest Level Tested
Unit
Total Ionizing Dose ( Gamma )
100
Krads (Si) MeV-cm2 /mg
Single Event Effects SEU, SEL, SEGR, SEB
>82
82
Screening and Process for LS-Series Converters
Requirement
Temperature Range Element Evaluation Internal Visual Temperature Cycle Constant Acceleration Burn-in Final Electrical (Group A) Seal, Fine & Gross External Visual Non Destructive Bond Pull PIND Radiographic
* per Commercial Standards
MIL-STD-883 Method
EM Suffix
-20C to +85C
Non Suffix
-55C to +125C MIL-PRF-38534, Class K Equivalent with SEM
2017 1010 2001 1015 MIL-PRF-38534 1014 2009 2023 2020 2012 48hrs @ 125C 25C
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Condition C 3 Kg, Y1Axis 320 hrs @125C In accordance with Device Specifications Conditions A1, C1
9 9
Condition A
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LS-SERIES
LS Series Output Voltage Adjustment
Output of LS series can be adjusted to be greater or less than the nominal output voltage with an external resistor. However, the ranges of the output voltages are limited depending on the model as specified in Table 1 and 2. An approximate value of the resistor can be determined using the following formula. For Single Output Model: Radj = A - (B x Vout) (C x Vout) - D A - (B x 2Vout) (C x 2Vout) - D
For Dual Output Model: Where:
Radj =
Radj is the value of the external resistor in kilo-ohms, Rdown or Rup in Figure 1 or 2. Power rating of the resistor shall be 0.125W. Metal film resistor with temperature coefficient of 50 ppm and tolerance of 1% is recommended. However, the final selection is dependent on specific design requirements. Vout is the desired output voltage in volts. A, B, C, and D are unique constants depending on the model as shown in Table 1 for single output models and Table 2 for dual output models.
Table 1: Single Output Voltage Ranges and Constants
Model LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S Output Voltage Range (V) (1) 1.500 to 1.600 1.400 to 1.500 2.500 to 2.750 2.250 to 2.500 3.300 to 3.630 2.970 to 3.300 5.000 to 5.500 4.500 to 5.000 12.000 to 13.200 10.800 to 12.000 15.000 to 16.500 13.500 to 15.000 A 69.65 56.85 48.42 39.52 43.48 35.48 119.48 97.52 295.22 241.01 370.61 302.55 B 32.39 40.47 13.04 21.19 9.25 16.18 20.00 29.31 19.98 53.31 19.98 63.61 C 8.75 7.14 3.52 2.88 2.50 2.04 2.27 1.85 2.27 1.85 2.27 1.85 D 13.13 10.72 8.81 7.19 8.25 6.73 11.36 9.27 27.24 22.24 34.05 27.80
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LS-SERIES
Table 2: Dual Output Voltage Ranges and Constants
Model LS2805D LS2812D LS2815D Voltage Range of Each Output (Vout) (1) 5.000 to 5.500 4.500 to 5.000 12.000 to 13.200 10.800 to 12.000 15.000 to 16.500 13.500 to 15.000 A 196.91 160.74 475.43 388.10 594.31 485.10 B 17.12 31.11 17.05 58.04 17.03 69.47 C 1.71 1.40 1.71 1.39 1.70 1.39 D 17.12 13.97 40.92 33.41 51.09 41.70
Note: (1). Also the minimum and maximum adjustment limits of the output voltage.
Placement of Radj
An external resistor must be added in order to trim the output voltage of an LS converter. The placement of an Radj resistor (Rdown or Rup) must be as shown in Figure 1 for single output models and as per Figure 2 for dual output models. Please note that the connections are made to the specific pins. Rup is placed across Out Return and Out Adj pins for output voltage greater than nominal output. Similar connections apply for the dual output models.
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LS-SERIES
Figure 1: Radj Placement for Single Output Model
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LS-SERIES
Figure 2: Radj Placement for Dual Output Model
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LS-SERIES
LS2801R5S Typical Efficiency at 25C
70 60
Efficiency, %
50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100
% of Rated Load
18V 28V 40V
LS2802R5S Typical Efficiency at 25C
100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100
% of Rated Load
Efficiency,%
18V 28V 40V
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LS-SERIES
LS2803R3S Typical Efficiency at 25C
90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100
% of Rated Load
Efficiency, %
18V 28V 40V
LS2805S Typical Efficiency at 25C
100 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100
% of Rated Load
Efficiency, %
18V 28V 40V
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LS-SERIES
LS2815S Typical Efficiency at 25C
90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100
% of Rated Load
Efficiency, %
18V 28V 40V
LS2815D Typical Efficiency at 25C
100 Efficiency, % 80 60 40 20 0 0 10 20 30 40 50 60 70 80 90 100 % of Rated Load 18V 28V 40V
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LS-SERIES
Block Diagram - Single Output
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Block Diagram - Dual Output
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LS-SERIES
Mechanical Diagram
2.300 0.375 1.550 0.25 Typ. o 0.128 4 Plcs 0.050
8
0.470
0.270 0.400 1.500 1.750 2.000 1.000 Ref 7 0.400 0.200 Pin o 0.040 0.350 0.850 0.220
1
0.400
2
2 Eq Spaces @ 0.200
2.80 Ref 0.250 0.425 Max
5
6
Pin Designation (Single/Dual)
Pin # 1 2 3 4 5 6 7 8 Single + Input Input Return Case Inhibit Output Adjust Output Return + Out N/C Dual + Input Input Return Case Inhibit Output Adjust - Out Output Common + Out
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. 01/2006
3 4
Tolerance: .XX = 0.01 .XXX = 0.005
Part Numbering LS 28 05 S /EM
Model Nominal Input Voltage 28 = 28V Output Voltage 01R5 = 1.5V, 02R5 = 2.5V 03R3 = 3.3V, 05 = 5V 12 = 12V, 15 = 15V Quality Level: Blank = Standard screening EM = Prototype Number of Outputs S = Single D = Dual
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