FEATURES * * * * * * * * * * * * Fully qualified to Class H or K Radiation hardened -55 to +125C operation 16 to 40 VDC input Fully isolated Optocoupler feedback Fixed frequency, 550 kHz typical Topology - Single Ended Flyback Inhibit function Indefinite short circuit protection 5 watts output power Up to 76% efficiency SMSA SERIES 5 WATT DC/DC CONVERTERS 28 VOLT INPUT MODELS VDC OUTPUT SINGLE DUAL 5 12 12 15 15 Size (max.): 1.075 x 1.075 x 0.270 inches (27.31 x 27.31 x 6.86 mm) See Figures 23 and 24 for dimensions. Weight: 15 grams maximum. Screening: Standard, Class H, or Class K (MIL-PRF-38534) Radiation hardness levels O, L, and R DESCRIPTION The SMSA SeriesTM of high frequency DC/DC converters offers a new standard of performance for low power, space qualified DC/DC converters. SMSA converters provide up to 5 watts output power over the full military temperature range of -55C to +125C with up to 76% efficiency. Thick-film hybrid techniques provide military/aerospace reliability levels and optimum miniaturization. The hermetically sealed case is only 1.075 by 1.075 inches -- with a height of only 0.270 inches. Power density for the SMSA Series converters is 16 watts per cubic inch. The SMSA Series' small size, light weight, and hermetically sealed metal packages make them ideal for use in space, military, aerospace and other high reliability applications. SCREENING AND REPORTS SMSA converters offer three screening options - Standard, Class H, or Class K - and three levels of radiation hardness. See Tables 1 through 3 for more information. Detailed reports on product performance are also available and are listed in Table 4. CONVERTER DESIGN The SMSA converters are switching regulators that use a flyback converter design with a constant switching frequency of 550 kHz. They are regulated, isolated units using a pulse width modulated topology and built as high reliability thick-film hybrids. Isolation between input and output circuits is provided with a transformer in the forward power loop and an optical link in the feedback control loop. Excellent input line transient response and audio rejection is achieved by an advanced feed-forward compensation technique. Negative output regulation is maintained by tightly coupled magnetics. Predictable current limit is accomplished by direct monitoring of the output load current, which results in a constant current output above the overload point. Internal input and output filters eliminate the need for external capacitors. WIDE VOLTAGE RANGE The SMSA converters are designed to provide full power operation over the full 16 to 40 VDC voltage range. An undervoltage lockout feature keeps the converter shutdown below approximately 13 VDC to ensure smooth initialization. IMPROVED DYNAMIC RESPONSE The SMSA feed-forward compensation system provides excellent dynamic response and noise rejection. Audio rejection is typically 50 dB. The minimum to maximjm step line transient response is typically less than 1%. INHIBIT FUNCTION SMSA converters provide a TTL open collector-compatible inhibit feature that can be used to disable internal switching and inhibit the unit's output. Inhibiting in this manner results in low standby current, and no generation of switching noise. The converter is inhibited when the TTL compatible low (0.8V) is applied to the inhibit pin. The unit is enabled when the pin, which is internally connected to a pull-up resistor, is left unconnected or is connected to an open collector gate. The open circuit output voltage associated with the inhibit pin is 9 to 11 VDC. In the inhibit mode, a maximum of 4 mA must be sunk from the inhibit pin at 28 VDC input. 1 DC/DC CONVERTERS SMSA SERIES 5 WATT TYPICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS INHIBIT Input Voltage * 16 to 40 V Output Power * 5 watts Lead Soldering Temperature (10 sec per lead) * 300C Storage Temperature Range (Case) * -65C to +135C Inhibit TTL Open Collector * Logic low (output disabled) Logic low voltage 0.8 V max Inhibit pin current 4 mA max * Referenced to input common * Logic high (output enabled) Open collector RECOMMENDED OPERATING CONDITIONS Input Voltage Range * 16 to 40 VDC continuous * 50 V for up to 50 msec transient Case Operating Temperature (Tc) * -55C to +125C full power * -55C to +135C absolute Derating Output Power/Current (Tc) * Linearly from 100% at 125C to 0% at 135C Output Voltage Temperature Coefficient * 100 ppm/C typical Input to Output Capacitance * 50 pF typical Isolation * 100 megohm minimum at 500 V Audio Rejection * 50 dB typical Conversion Frequency * 550 kHz typical 450 kHz min, 600 kHz max Inhibit Pin Voltage (unit enabled) * 9 to 11 V Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified. SINGLE OUTPUT MODELS PARAMETER CONDITIONS OUTPUT VOLTAGE Tc = -55C TO +125C OUTPUT CURRENT Tc = -55C TO +125C VIN = 16 TO 40 VDC OUTPUT POWER OUTPUT RIPPLE VOLTAGE LINE REGULATION LOAD REGULATION INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT Tc = -55C TO +125C INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT1, 2 SHORT CIRCUIT STEP LOAD RESPONSE2, 3 STEP LINE RESPONSE2, 3 SMSA2805S MIN TYP MAX 4.95 5.00 5.05 SMSA2812S MIN TYP MAX 11.88 12.00 12.12 SMSA2815S MIN TYP MAX 14.85 15.00 15.15 UNITS VDC 0 -- 1000 0 -- 417 0 -- 333 mA Tc = -55C TO +125C -- -- 5 -- -- 5 -- -- 5 W 10 kHz - 2 MHz VIN = 16 TO 40 VDC Tc = -55C TO +125C NO LOAD TO FULL Tc = -55C TO +125C Tc = -55C TO +125C CONTINUOUS TRANSIENT 50 ms NO LOAD FULL LOAD INHIBITED 10 kHz - 10 MHz Tc = -55C TO +125C -- 150 450 -- 125 500 -- 150 600 mV p-p -- 10 50 -- 10 50 -- 10 50 mV VIN = 16 TO 40 VDC -- 10 50 -- 10 50 -- 10 50 mV 16 0 -- -- -- -- -- 64 -- -- 28 -- 35 250 3 50 60 69 1.5 12.5 40 50 60 -- 5 200 300 -- 2.0 25 16 0 -- -- -- -- -- 68 -- -- 28 -- 35 235 3 50 60 74 1.2 1 40 50 60 -- 5 200 300 -- 1.9 10 16 0 -- -- -- -- -- 69 -- -- 28 -- 35 235 3 50 60 74 1.2 1 40 50 60 -- 5 200 300 -- 1.8 10 VDC V -- -- 200 200 500 500 -- -- 300 400 750 1000 -- -- 400 400 1000 1000 -- 200 500 -- 200 800 -- 200 500 -- 200 500 -- 250 600 -- 200 500 16 TO 40 VIN -- 400 1000 -- 700 1300 -- 500 1300 40 TO 16 VIN DELAY OVERSHOOT -- 400 1000 -- 700 1300 -- 500 1300 -- -- 10 0 75 200 -- -- 10 0 75 500 -- -- 10 0 75 500 POWER DISSIPATION RECOVERY 50% - 100% - 50% TRANSIENT RECOVERY TRANSIENT 16 TO 40 VIN 40 TO 16 VIN mA mA p-p % W ms mV pk s mV pk RECOVERY START-UP Notes 1. Indefinite short circuit protection not guaranteed above 125C (case). 2. Recovery time is measured from application of the transient to point at which VOUT is within 1% of VOUT at final value. 2 3. Transition time >10s. s ms mV pk SMSA SERIES 5 WATT DC/DC CONVERTERS Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified. DUAL OUTPUT MODELS PARAMETER OUTPUT VOLTAGE SMSA2812D CONDITIONS SMSA2815D MIN TYP MAX MIN TYP MAX +VOUT 11.88 12.00 12.12 14.85 15.00 15.15 -VOUT 11.76 12.00 12.24 14.70 15.00 15.30 -- 208 333 -- 167 267 UNITS VDC OUTPUT CURRENT1 VIN = 16 to 40 VDC Tc = -55C to +125C OUTPUT POWER1 VIN = 16 to 40 VDC Tc = -55C to +125C -- -- 5 -- -- 5 W 10 kHz - 2 MHz -- 80 300 -- 120 300 mV p-p Tc = -55C to +125C +VOUT -- 20 100 -- 10 50 -- 40 200 -- 40 180 OUTPUT RIPPLE VOLT. LINE REGULATION Vin = 16 to 40 VDC -VOUT LOAD REGULATION NO LOAD TO FULL Tc = -55C to +125C +VOUT -VOUT CROSS REGULATION2 +PO = 20 - 80 %, -PO = 80 - 20% -- 10 120 -- 10 50 -- 100 400 -- 50 200 -- 3.7 6 -- 3 6 mA mV mV -PO = 20 - 80 %, +PO = 80 - 20% INPUT VOLTAGE Tc = -55C to +125 NO LOAD TO FULL CONTINUOUS 16 28 40 16 28 40 VDC -- -- -- 40 50 63 -- -- -- 38 50 60 V INPUT CURRENT TRANSIENT 50 ms NO LOAD FULL LOAD INHIBITED 10 kHz TO 10 MHz Tc = -55C to +125C -- -- -- -- 67 235 3 50 60 73 -- 5 200 300 -- -- -- -- -- 68 235 3 50 60 73 -- 5 200 300 -- mA -- -- 1.3 1 1.7 30 -- -- 1.3 1 1.6 50 W ms Tc = -55C to +125C INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT3, 4 STEP LOAD RESPONSE4, 5 BOTH OUTPUTS STEP LINE RESP.4, 5 BOTH OUTPUTS START-UP mA p-p % POWER DISSIPATION SHORT CIRCUIT RECOVERY 50% - 100% - 50% BALANCED TRANSIENT -- 200 550 -- 220 600 mV RECOVERY -- 200 500 -- 200 500 s -- -- -- -- -- -- 200 200 300 800 10 0 500 500 750 2000 30 500 -- -- -- -- -- -- 600 600 500 500 10 0 1500 1500 1200 1200 25 500 16 TO 40 VDC TRANSIENT 40 TO 16 VDC 16 TO 40 VDC RECOVERY 40 TO 16 VDC DELAY OVERSHOOT Notes 1. Up to 4 watts (80% of full power) is available from either output providing the opposite output is carrying 20% of total power. 2. Shows regulation effect on the minus output during the defined cross loading conditions, with 80% and 20% referring to the total output power of the converter. See Figures 15 and 16. mV pk s ms mV pk 3. Indefinite short circuit protection not guaranteed above 125C (case). 4. Recovery time is measured from application of the transient to point at which VOUT is within 1% of VOUT at final value. 5. Transition time >10s. 3 DC/DC CONVERTERS SMSA SERIES 5 WATT Positive 6 Input Output Filter Error Amp Inhibit 5 PWM Control Input 7 Common Output Filter Feedback Case 8 Ground = DUAL OUTPUT FIGURE 1: SMSA BLOCK DIAGRAM SMSA Positive 6 Input 12 k 5k Inhibit 5 400 50 k 200 pF 2N3904 10 K 10 k 3.9 K 7 Input Common FIGURE 2: INHIBIT INTERFACE 4 Vcc Typically 1.5 V when inhibited 1 Positive Output VR 2 Output Common 3 Negative Output SMSA SERIES 5 WATT DC/DC CONVERTERS EMI Filter Positive Input SMSA2815S Positive Output From input power source Positive Input Case Input Common T1 Positive Output C2 Output Common + C3 To Load Input Common Output Common Case T1 C1 FIGURE 3: LOW NOISE OUTPUT FILTER FOR S MSA SINGLE OUTPUT MODEL EMI Filter Positive Input SMSA2815D Positive Output From input power source Positive Input Case Input Common Output Common T1 Positive Output C2 Output Common Input Common C4 Negative Output + C3 To Loads + C5 Case C1 T1 FIGURE 4: LOW NOISE OUTPUT FILTER FOR SMSA DUAL OUTPUT MODEL The filter suggestions in Figures 3 and 4 will further reduce the output ripple for systems requiring very low output noise. C1 = 0.27 F ceramic capacitor, 500V C2 = C4 = 6.8 F tantalum capacitor C3 = C5 = 0.27 F ceramic capacitor Single output: T1 = 15T #28 AWG winding on toroid, i = 5000 Dual output: T2 = 10T #28 AWG winding on toroid, i = 5000 For best results, make interconnections as short as possible. 5 DC/DC CONVERTERS SMSA SERIES 5 WATT PIN OUT Pin 1 2 3 4 5 6 7 8 Single Output Positive Output Output Common No connection No connection Inhibit Positive Input Input Common Case Ground Dual Output Positive Output Output Common Negative Output No connection Inhibit Positive Input Input Common Case Ground Squared corner on header and dot on top of cover indicate pin one. 1 2 3 4 5 BOTTOM VIEW SMSA 8 7 6 See Figures 23 and 24 for dimensions. FIGURE 5: PIN OUT BOTTOM VIEW SMD NUMBERS MODEL NUMBERING KEY SMSA Base Model Voltage In (28V) Output Voltage Number of Outputs (S = single, D = dual) Environmental Screening Radiation Tolerance 6 28 05 S / K R STANDARD MICROCIRCUIT DRAWING (SMD) 5962-9309202HXC 5962-9309302HXC 5962-9309402HXC 5962-9308902HXC 5962-9309002HXC SMSA SERIES SIMILAR PART SMSA2805S/HO SMSA2812S/HO SMSA2815S/HO SMSA2812D/HO SMSA2815D/HO The SMD number shown is for Class H screening and no Radiation Hardness Assurance (RHA) level. See the SMD for the numbers for other screening and radiation levels. For exact specifications for an SMD product, refer to the SMD drawing. SMDs can be downloaded from: http://dscc.dla.mil/programs/smcr DC/DC CONVERTERS SMSA SERIES 5 WATT Typical Performance Curves: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified. 80 28V 50 40 60 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 70 70 40V 30 16V 16V 70 60 80 80 16V 28V 40V 50 1 2 3 4 5 30 6 OUTPUT POWER (Watts) 28V 40V 50 40 40 SMSA2805S EFFICIENCY 60 30 1 2 3 4 5 6 1 2 3 4 5 6 OUTPUT POWER (Watts) OUTPUT POWER (Watts) SMSA2812S EFFICIENCY SMSA2815S EFFICIENCY FIGURE 2 FIGURE 4 FIGURE 3 80 10 60 40V 28V 50 40 20 40 50 60 70 80 90 1 2 3 4 5 6 100 0.1 1 100s/div 16V TO 40V SMSA SERIES AUDIO REJECTION SMSA2805S STEP LINE RESPONSE FIGURE 7 FIGURE 6 100% to 10% VIN 10% to 100% 50% to 100% 1V/div. 50mV/div. 50mV/div. 100% to 50% 100s/div 10% 100% SMSA2805S STEP LOAD RESPONSE FIGURE 8 FIGURE 9 50% to 10% VOUT 1 ms / div 100s/div 50% 100% SMSA2805S STEP LOAD RESPONSE SMSA2805S TURN-ON INTO NO LOAD FIGURE 10 -POUT=2.5W -POUT=0.5W VIN 90% to 10% +VOUT 200mV/div. 100mV/div. 20V/div. 100 FREQUENCY (kHz) SMSA2815D EFFICIENCY FIGURE 5 100mV/div. 10 VOUT OUTPUT POWER (Watts) 20V/div. 30 VIN 30 20mV/div. ATTENUATION (dB) EFFICIENCY (%) 20V/div. 16V 70 -VOUT 10% to 90% 10% to 50% 200s/div 16V TO 40V 100s/div 10% 50%) SMSA2815D INPUT STEP LINE RESPONSE 200s/div 10% 90% SMSA2815D +VO STEP LOAD RESPONSE SMSA2815D +VO STEP LOAD RESPONSE FIGURE 11 FIGURE 12 FIGURE 13 7 DC/DC CONVERTERS SMSA SERIES 5 WATT VIN 5V/div. +VOUT -VOUT 10 5 8 4 6 4 2812D 2 0 2815D -2 -4 -6 -8 -10 500s/div SMSA2815D TURN-ON INTO NO LOAD -VOUT VOLTAGE CHANGE (%) -VOUT VOLTAGE CHANGE (%) 20V/div. Typical Performance Curves: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified. 90/10 70/30 50/50 30/70 10/90 SMSA DUAL CROSS REGULATION FIGURE 14 16 INPUT VOLTAGE (Volts) INPUT VOLTAGE (Volts) 17 2805S 15 2812S 14 13 2815D 16 15 14 13 2812D 2815S 12 1 2 3 4 6 1 2 3 4 5 6 OUTPUT POWER (Watts) 50 mV DROP OUTPUT POWER (Watts) 50 mV DROP SMSA LOW LINE DROPOUT VS. LOAD SMSA LOW LINE DROPOUT VS. LOAD FIGURE 17 8 5 12 COND A 1 0 FIGURE 18 2815D -1 COND B -2 -3 2812D -4 10 20 30 40 50 OUTPUT LOAD (%) COND. A: 50% LOAD +V; 10% to 50% -V COND. B: 50% LOAD -V; 10% to 50% +V SMSA DUAL CROSS REGULATION FIGURE 16 FIGURE 15 17 2 -5 OUTPUT LOAD (+VOUT % / -VOUT %) 90-10% LOAD on +V, 10-90% LOAD on -V 2812D 3 DC/DC CONVERTERS Dot on top of case indicates pin one CASE C BOTTOM VIEW See Figure 24 for pin configurations. 1.075 max (27.31) SMSA SERIES 5 WATT Materials Header Cold Rolled Steel/Nickel/Gold Cover Cold Rolled Steel/Nickel Pins Copper/Nickel/Gold compression glass seal 1.075 max (27.31) Case dimensions in inches (mm) Tolerance 0.005 (0.13) for three decimal places 0.01 (0.3) for two decimal places unless otherwise specified CAUTION Heat from reflow or wave soldering may damage the device. Solder pins individually with heat application not exceeding 300C for 10 seconds per pin. FIGURE 23: CASE C MAXIMUM DIMENSIONS BOTTOM VIEW CASE C1 SMSA Series Projection Weld Squared corner and dot on top of case indicate pin one. 0.932 (23.67) 1 2 3 4 5 0.932 (23.67) 6 0.732 (18.59) 7 0.332 (8.43) 8 0.532 (13.51) 0.000 0.000 0.205 0.010 (5.21 0.25) 0.270 max. (6.86) 0.132 (3.35) 0.000 0.132 (3.35) 0.025 (0.64) dia. FIGURE 24: CASE C1 Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer to the numerical dimensions for accuracy. 9 DC/DC CONVERTERS SMSA SERIES 5 WATT TABLE 1: ELEMENT EVALUATION ELEMENT EVALUATION TEST PERFORMED (COMPONENT LEVEL) STANDARD CLASS (O) H M/S P M/S P CLASS K M/S P Element Electrical yes no yes yes yes yes Element Visual no no yes yes yes yes Internal Visual no no yes no yes no Temperature Cycling no no no no yes yes Constant Acceleration no no no no yes yes Interim Electrical no no no no yes no Burn-in no no no no yes no Post Burn-in Electrical no no no no yes no Steady State Life no no no no yes no Voltage Conditioning /Aging no no no no no yes Visual Inspection no no no no no yes Final Electrical no no yes yes yes yes Wire Bond Evaluation no no yes yes yes yes SEM SLAMTM/C-SAM: Input capacitors only (Add'l test, not req. by H or K) no no no no yes no no no no yes no yes Notes M/S P Active components (Microcircuit and Semiconductor Die) Passive components Definitions Element Evaluation: Component testing/screening per MIL-STD-883 as determined by MIL-PRF-38534 SEM: Scanning Electron Microscopy SLAMTM: Scanning Laser Acoustic Microscopy C-SAM: C - Mode Scanning Acoustic Microscopy 10 SMSA SERIES 5 WATT DC/DC CONVERTERS TABLE 2: PRODUCT ENVIRONMENTAL SCREENING ENVIRONMENTAL SCREENING TEST PERFORMED (END ITEM LEVEL) Non-destruct bond pull Method 2023 Pre-cap inspection Method 2017, 2032 Temperature cycle Method 1010, Cond. C Constant acceleration Method 2001, 3000 g PIND Test Method 2020, Cond. B Radiography Method 2012 Pre burn-in test Burn-in, Method 1015, 125C 96 hours 160 hours 2 x 160 hour (includes mid BI test) Final electrical test MIL-PRF-38534, Group A Hermeticity test Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Final visual inspection Method 2009 STANDARD (O) CLASS H CLASS K no no yes yes yes yes yes yes yes yes yes yes no no yes no yes no yes yes yes yes no no no yes no no no yes yes yes yes yes yes yes yes yes yes yes yes yes Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. 11 DC/DC CONVERTERS SMSA SERIES 5 WATT TABLE 3: RADIATION HARDNESS LEVELS PRODUCT LEVEL AVAILABILITY RADIATION HARDNESS LEVELS O: Standard, no radiation guarantee For system evaluation, electrically and mechanically comparable to H and K level. L: Radiation hardened - Tested lots Up to 50 k Rads (Si) total dose No SEU guarantee R: Radiation hardened - Tested lots Up to 100 k Rads (Si) total dose SEU guarantee up to 40 MeV L and R are referenced to Assurance (RHA) levels. ENVIRONMENTAL SCREENING LEVELS STANDARD CLASS CLASS (O) H K OO HO Not available Not available HL KL Not available HR KR MIL-PRF-38534, appendix G, Radiation Hardness TABLE 4: REPORTS INCLUDED WITH PURCHASE OF PRODUCT HL, KL, HR, or KR 1. Radiation Susceptibility Analysis 2. Electrical/Thermal Stress Analysis and Derating Report 3. MTBF Report 4. FMEA Report HO option: Reports 2, 3, and 4 are included with purchase. OO option: Select reports available as separate purchases. Contact Information: www.interpoint.com Interpoint Headquarters USA Phone: 1-800-822-8782 +425-882-3100 Email: power@intp.com Interpoint UK Phone: +44-1252-815511 Email: poweruk@intp.com 12 11915-001-DTS Rev A This revision supercedes all previous releases. All technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make changes in products or specifications without notice. SMSA Series is a trademark of Interpoint. Copyright (c) 1997-2001 Interpoint Corporation. All rights reserved. Interpoint France Phone: +33-134285455 Email: powerfr@intp.com