LS2815D

PD-96964A HYBRID - HIGH RELIABILITY RADIATION HARDENED 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 80 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. 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. Variations in electrical specifications and screening to meet custom requirements can be accommodated. LS-SERIES 28V Input, Single/Dual Output LS Features n 18 to 40V DC Input Range n Total Ionization Dose > 100K Rad(Si) n SEE Hardened to LET (Heavy Ions) up to 2 82 MeV•cm /mg (SEU, SEL, SEGB, SEGR) n Internal EMI filter; Converter Capable of meeting MIL-STD-461C CE03 n Low Weight, < 80 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 100MΩ @ 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) n Standard Microcircuit Drawings Available Applications n n n n n Geo Synchronous Satellite Low Earth Orbit Deep Space Probe Communication and Display Systems Payload and Experiment LVPS www.irf.com 1 08/11/06 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). 2 www.irf.com LS-SERIES Absolute Maximum Ratings Input voltage range Output power Lead temperature Operating case temperature Storage temperature -0.5Vdc to +60Vdc Internally limited +300°C for 10 seconds R ecommended Operating Conditions Input voltage range Output power 1 + 4.5Vdc to +40Vdc 0 to Max. Rated -55°C to +85°C -55°C to +70°C Operating case temperature -55°C to +125°C (Note 13) Operating case temperature2 -55°C to +135°C Electrical Performance Characteristics Parameter G roup A Subgroup 1. Input voltage rating is BOL. Input voltage range reduced to 20 to 40VDC for EOL. 2. Meets de-rating per MIL-STD-975 Limits Unit V Conditions -55°C ≤ TC ≤ +85°C V IN = 28V DC ± 5%, CL = 0 unless otherwise specified Min 18 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 Input Voltage O utput 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 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 = 1 00% 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 V IOUT = 1 00% rated load Notes 4, 14 V V IN = 18, 28, 40 Volts, Note 2 1,2,3 W 1,2,3 V IN = 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 www.irf.com 3 LS-SERIES Electrical Performance Characteristics Parameter Group A Subgroup ( continued ) Limits Unit 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 Conditions -55°C ≤ TC ≤ +85°C VIN = 28V DC ± 5%, CL = 0 unless otherwise specified IOUT = 0, Pin 4 open 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 mA 1,2,3 1,2,3 Pin 4 shorted to pin 2 mA VIN = 18, 28, 40 Volts IOUT = 100% rated load Notes 4, 6 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 % 1,2,3 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 µs mV pk µs For Notes to Electrical Performance Characteristics, refer to page 5 4 www.irf.com LS-SERIES Electrical Performance Characteristics Parameter Group A Subgroup ( continued ) Limits Unit Min Nom Max Conditions -55°C ≤ TC ≤ +85°C VIN = 28V DC ± 5%, CL = 0 unless otherwise specified 10% Load, Full Load Notes 4,12 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 4,5,6 0 150 250 330 500 1000 1000 500 1000 1000 10 mV ms IOUT = 100% rated load No effect on DC performance Notes 1, 4, 7 Each output on duals 2500 2500 2200 1000 180 120 500 90 60 35 100 80 50 µF 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 dB MΩ g Hr MIL-HDBK-217F2, SF, 35°C 4.0 x 10 6 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 µs. 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 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, de-rate the maximum output power linearly from 100% to 75%. End of life (EOL) is ± 3% www.irf.com 5 LS-SERIES Circuit for Measuring Output Ripple Voltage 50 Ω 50 Ω Coax 1 µF Oscilliscope or equivalent with 10 MHz bandwidth, multiply readings by 2. 50 Ω Termination 0.1 µF + 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 International Rectifier currently does not have a DSCC certified Radiation Hardness Assurance Program. 6 www.irf.com 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 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 LS2801R5S LS2802R5S LS2803R3S LS2805S LS2812S LS2815S www.irf.com 7 LS-SERIES Table 2: Dual Output Voltage Ranges and Constants Model 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 LS2805D LS2812D LS2815D 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. 8 www.irf.com LS-SERIES Figure 1: Radj Placement for Single Output Model Pˆ‡ @HD Avy‡r… Wv Sr‡ˆ… Duviv‡ 8h†r 0 Wv  $W C‚ˆ†r xrrƒvt $W Tˆƒƒy’ Gr‰ry U…h†yh‡‚…ÃÉ A@UÃ9…v‰r… Tu‚…‡Ã8x‡ÃÉ P‰r…y‚hq Q…‚‡rp‡v‚ Pˆ‡ Sr‡ˆ… Sq‚ Sˆƒ >=1 0 P†pvyyh‡‚… 0 @6 Pˆ‡ƒˆ‡ 6qw QXH Sh€ƒ Brr…h‡‚… Th€ƒyr hqÃC‚yq Arrqihpx U…vttr… www.irf.com 9 LS-SERIES Figure 2: Radj Placement for Dual Output Model Pˆ‡ @HD Avy‡r… Wv Sr‡ˆ… Duviv‡ 8h†r 0 Wv C‚ˆ†r xrrƒvt $W Tˆƒƒy’  $W Pˆ‡ Sr‡ˆ… ÃPˆ‡ Gr‰ry U…h†yh‡‚…ÃÉ A@UÃ9…v‰r… Tu‚…‡Ã8x‡ÃÉ P‰r…y‚hq Q…‚‡rp‡v‚ Sˆƒ Sq‚ >=1 0 P†pvyyh‡‚… 0 @6 Pˆ‡ƒˆ‡ 6qw QXH Sh€ƒ Brr…h‡‚… Th€ƒyr hqÃC‚yq Arrqihpx U…vttr… 10 www.irf.com LS-SERIES LS2801R5S Typical Efficiency at 25°C 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 % of Rated Load Efficiency, %n 18V 28V 40V LS2802R5S Typical Efficiency at 25°C 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 www.irf.com 11 LS-SERIES LS2803R3S Typical Efficiency at 25°C 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, %c 18V 28V 40V LS2805S Typical Efficiency at 25°C 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, %y 18V 28V 40V 12 www.irf.com LS-SERIES LS2815S Typical Efficiency at 25°C 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, %y 18V 28V 40V LS2815D Typical Efficiency at 25°C 100 Efficiency, %c 80 60 40 20 0 0 10 20 30 40 50 60 70 80 90 100 18V 28V 40V % of Rated Load www.irf.com 13 LS-SERIES Block Diagram - Single Output WÃvƒˆ‡ 1 7 Wˆ‡ @HDà Avy‡r… Dƒˆ‡Ã Sr‡ˆ… 2 7vh†Ã Tˆƒƒy’ $W  $W Pˆ‡ƒˆ‡Ã Sr‡ˆ… 6 Gr‰ryà U…h†yh‡‚…ÃÉà A@UÃ9…v‰r…à Tu‚…‡Ã8x‡ÃÉà P‰r…y‚hqà Q…‚‡rp‡v‚Ã Duviv‡ 8h†rà B…‚ˆq 4 3 0 >=1 0 5 @6 P†pvyyh‡‚… 0 Pˆ‡ƒˆ‡Ã 6qwˆ†‡ QXH Sh€ƒÃ Brr…h‡‚… Th€ƒyrà hqÃC‚yq Arrqihpxà U…vttr… Block Diagram - Dual Output WÃvƒˆ‡ 1 8 Wˆ‡ Pˆ‡ƒˆ‡Ã Sr‡ˆ… ÃWˆ‡ @HDà Avy‡r… Dƒˆ‡ Sr‡ˆ… 2 7vh†Ã Tˆƒƒy’ $W  $W 7 6 Gr‰ryà U…h†yh‡‚…ÃÉà A@UÃ9…v‰r…à 4 Duviv‡ 8h†rà B…‚ˆq 3 Tu‚…‡Ã8x‡ÃÉà P‰r…y‚hqà Q…‚‡rp‡v‚Ã 0 >=1 0 @6 P†pvyyh‡‚… 0 Pˆ‡ƒˆ‡Ã 6qwˆ†‡ 5 QXH Sh€ƒÃ Brr…h‡‚… Th€ƒyrà hqÃC‚yq Arrqihpxà U…vttr… 14 www.irf.com LS-SERIES Mechanical Outline 2.300 0.375 1.550 0.25 Typ. ø 0.128 4 Plcs 0.050 8 0.470 0.270 0.400 7 1.500 1.750 2.000 1.000 Ref 1 0.400 0.400 0.200 2 2 Eq Spaces @ 0.200 5 6 0.350 3 4 0.850 2.80 Ref 0.250 Pin ø 0.040 0.220 0.425 Max Tolerance: .XX = ±0.01 .XXX = ±0.005 Pin Designation (Single/Dual) Pin # 1 2 3 4 5 6 7 8 Single + Input Input Return Case Ground Inhibit Output Adjust Output Return + Output NC Dual + Input Input Return Case Ground Inhibit Output Adjust - Output Output Return + Output www.irf.com 15 LS-SERIES Device Screening Requirement Temperature Range Element Evaluation Non-Destructive Bond Pull Internal Visual Temperature Cycle Constant Acceleration PIND Burn-In Final Electrical ( Group A ) PDA Seal, Fine and Gross Radiographic External Visual MIL-PRF-38534 2023 2017 1010 2001, Y1 Axis 2020 1015 MIL-PRF-38534 & Specification MIL-PRF-38534 1014 2012 2009 MIL-STD-883 Method No Suffix d CK d EM -55°C to +85°C N/A N/A -55°C to +85°C Class K Yes Yes Cond C 3000 Gs Cond A 320 hrs @ 125°C ( 2 x 160 hrs ) -55°C, +25°C, +85°C 2% Cond A, C Yes Yes -55°C to +85°C Class K Yes Yes Cond C 3000 Gs Cond A 320 hrs @ 125°C ( 2 x 160 hrs ) -55°C, +25°C, +85°C 2% Cond A, C Yes Yes c Cond C 3000 Gs N/A 48 hrs @ 125°C -55°C, +25°C, +85°C N/A Cond A N/A c Notes: c d Best commercial practice. CK is DSCC class K compliant without radiation performance. No Suffix is a radiation rated device but not available as a DSCC qualified SMD per MIL-PRF-38534. International Rectifier currently does not have a DSCC certified Radiation Hardness Assurance Program. Standard Microcircuit Drawing Equivalence Table S tandard M icrocircuit D raw ing Num ber 5962-05238 5962-05239 5962-05240 5962-05241 5962-05242 5962-06241 5962-06242 Part Numbering LS Model Input Voltage Nominal 28 = 28V IR Standard Part Num ber LS 2801R5S LS 2803R3S LS2805S LS2812D LS2815D LS2812S LS2815S 28 05 S /EM Screening Level (Please refer to Screening Table) No Suffix, CK, EM, Output Voltage 01R5 = 1.5V, 02R5 = 2.5V, 03R3 = 3.3V, 05 = 5V, 12 = 12V, 15 = 15V 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. 08/2006 16 www.irf.com