FEATURES • • • • • • • • • • • • Fully qualified to Class H or K Radiation hardened –55° to +125°C 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 3.3 ±5 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: Space prototype, Class H, or Class K (MIL-PRF-38534) Radiation hardness levels O or R Available configurations: OO, HO, HR, KR DESCRIPTION The SMSA Series™ 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 –55°C to +125°C 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 – Space prototype Class H, or Class K – and two 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 maximum 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. 45 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) • 300°C Storage Temperature Range (Case) • –65°C to +135°C 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 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 RECOMMENDED OPERATING CONDITIONS Input Voltage Range • 16 to 40 VDC continuous • 50 V for up to 50 msec transient Case Operating Temperature (Tc) • –55°C to +125°C full power • –55°C to +135°C absolute Derating Output Power/Current (Tc) • Linearly from 100% at 125°C to 0% at 135°C Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified. SINGLE OUTPUT MODELS PARAMETER CONDITIONS OUTPUT VOLTAGE Tc = –55°C TO +125°C OUTPUT CURRENT Tc = –55°C TO +125°C VIN = 16 TO 40 VDC OUTPUT POWER OUTPUT RIPPLE VOLTAGE LINE REGULATION LOAD REGULATION INPUT VOLTAGE INPUT CURRENT INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT1, 2 SHORT CIRCUIT STEP LOAD RESPONSE STEP LINE RESPONSE2, 3 SMSA283R3S MIN TYP MAX 3.25 3.30 3.35 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 — 1200 0 — 1000 0 — 417 0 — 333 mA Tc = –55°C TO +125°C — — 4 — — 5 — — 5 — — 5 W 10 kHz - 2 MHz VIN = 16 TO 40 VDC Tc = –55°C TO +125°C NO LOAD TO FULL Tc = –55°C TO +125°C Tc = –55°C TO +125°C NO LOAD TO FULL CONTINUOUS TRANSIENT3 50 ms NO LOAD FULL LOAD INHIBITED 10 kHz - 10 MHz Tc = –55°C TO +125°C — 300 600 — 150 450 — 125 500 — 150 600 mV p-p — 10 50 — 10 50 — 10 50 — 10 50 mV — 10 50 — 10 50 — 10 50 — 10 50 mV 16 0 — — — — — 60 — — 28 — 35 250 3 50 60 — 1.5 12.5 40 50 60 — 5 200 300 — 2.4 25 16 0 — — — — — 68 — — 28 — 35 250 3 50 60 74 1.5 12.5 40 50 60 — 5 200 300 — 2.0 25 16 0 — — — — — 69 — — 28 — 35 235 3 50 60 74 1.2 1 40 50 60 — 5 200 300 — 1.9 10 16 0 — — — — — % — — 28 — 35 235 3 50 60 40 50 60 — 5 200 300 VDC V 1.2 1 1.8 10 W ms — — 200 200 500 500 — — 200 200 500 500 — — 300 400 750 1000 — — 400 400 1000 1000 mV pk µs — 200 500 — 200 500 — 200 800 — 200 500 — 200 500 — 200 500 — 250 600 — 200 500 16 TO 40 VIN — 400 1000 — 400 1000 — 700 1300 — 500 1300 40 TO 16 VIN DELAY OVERSHOOT3 — 400 1000 — 400 1000 — 700 1300 — 500 1300 — — 10 0 75 200 — — 10 0 75 200 — — 10 0 75 500 — — 10 0 75 500 VIN = 16 TO 40 VDC POWER DISSIPATION RECOVERY 50% - 100% - 50% TRANSIENT RECOVERY 2, 3 TRANSIENT 16 TO 40 VIN 40 TO 16 VIN mA mA p-p mV pk RECOVERY START-UP Notes 1. Indefinite short circuit protection not guaranteed above 125°C (case). 2. Recovery time is measured from application of the transient to point at which VOUT is within 1% of VOUT at final value. 3. Guaranteed but not tested. ® 46 µs ms mV pk SMSA SERIES 5 WATT DC/DC CONVERTERS Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified. DUAL OUTPUT MODELS PARAMETER SMSA 2805D CONDITIONS OUTPUT VOLTAGE SMSA2812D SMSA2815D MIN TYP MAX MIN TYP MAX MIN TYP MAX +VOUT 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 –VOUT 4.9 5.0 5.1 11.76 12.00 12.24 14.70 15.00 15.30 800 — ±208 333 — ±167 267 UNITS VDC OUTPUT CURRENT1 VIN = 16 to 40 VDC Tc = –55°C to +125°C — ±500 OUTPUT POWER1 VIN = 16 to 40 VDC Tc = –55°C to +125°C — — 5 — — 5 — — 5 W 10 kHz - 2 MHz — — 300 — 80 300 — 120 300 mV p-p — 20 100 — 20 100 — 10 50 — 40 200 — 40 200 — 40 180 — 10 120 — 10 120 — 10 50 — 100 400 — 100 400 — 50 200 — 5 8 — 3.7 6 — 3 6 % NO LOAD TO FULL CONTINUOUS 16 28 40 16 28 40 16 28 40 VDC TRANSIENT5 50 msec NO LOAD — — — 30 50 50 — — — 40 50 63 — — — 38 50 60 V FULL LOAD — 248 — — 235 — — 235 — mA INHIBITED 10 kHz TO 10 MHz — — 3 50 5 200 — — 3 50 5 200 — — 3 50 5 200 CURRENT EFFICIENCY Tc = –55°C to +125°C — 65 60 70 300 — — 67 60 73 300 — — 68 60 73 300 — LOAD FAULT3, 4 POWER DISSIPATION SHORT CIRCUIT OUTPUT RIPPLE VOLT. LINE REGULATION Vin = 16 to 40 VDC Tc = –55°C to +125°C +VOUT –VOUT LOAD REGULATION –VOUT +PO = 30 - 70 %, –PO =70 - 30% –PO = 30 - 70 %, +PO = 70 - 30% INPUT VOLTAGE INPUT CURRENT INPUT RIPPLE mV NO LOAD TO FULL Tc = –55°C to +125°C +VOUT CROSS REGULATION2 mA mV mA p-p % — 1.3 2.1 — 1.3 1.7 — 1.3 1.6 W — — 50 — 1 30 — 1 50 ms STEP LOAD RECOVERY 50% - 100% - 50% BALANCED RESPONSE TRANSIENT — ±200 ±550 — ±200 ±550 — ±220 ±600 mV RECOVERY4, 5 — 200 500 — 200 500 — 200 500 µs 16 TO 40 VDC TRANSIENT 40 TO 16 VDC — — ±200 ±200 ±500 ±500 — — ±200 ±200 ±500 ±500 — — ±600 ±600 ±1500 ±1500 mV pk 16 TO 40 VDC 40 TO 16 VDC DELAY OVERSHOOT5 — — — — 300 800 10 0 750 2000 30 500 — — — — 300 800 10 0 750 2000 30 500 — — — — 500 500 10 0 1200 1200 25 500 STEP LINE RESP.4, 5 RECOVERY START-UP 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. µs ms mV pk 3. Indefinite short circuit protection not guaranteed above 125°C (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. Guaranteed but not tested. ® 47 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 1 Positive Output VR 2 Output Common 3 Negative Output = 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 Vcc Typically 1.5 V when inhibited Input Common FIGURE 2: INHIBIT INTERFACE ® 48 SMSA SERIES 5 WATT DC/DC CONVERTERS EMI Filter Positive Input SMSA2815S Positive Output From input power source Positive Input Positive Output Case Input Common T1 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 µF ceramic capacitor, 500V C2 = C4 = 6.8 µF tantalum capacitor C3 = C5 = 0.27 µF ceramic capacitor Single output: T1 = 15T #28 AWG winding on toroid, µi = 5000 Dual output: T2 = 10T #28 AWG winding on toroid, µi = 5000 For best results, make interconnections as short as possible. ® 49 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. 2 1 3 4 5 BOTTOM VIEW SMSA 8 7 6 See Figures 23 and 24 for dimensions. FIGURE 5: PIN OUT BOTTOM VIEW SMD NUMBERS STANDARD MICROCIRCUIT DRAWING (SMD) MODEL NUMBERING KEY SMSA Base Model Voltage In (28V) Output Voltage Number of Outputs (S = single, D = dual) Environmental Screening Radiation Tolerance 28 05 S / K R IN PROCESS 5962-9309202HXC 5962-9309302HXC 5962-9309402HXC 5962-9308902HXC 5962-9309002HXC SMSA SERIES SIMILAR PART SMSA283R3S/HO 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. Call your Interpoint representative for status on the SMSA SMD releases which are “in process.” SMDs can be downloaded from: http://www.dscc.dla.mil/programs/smcr ® 50 DC/DC CONVERTERS SMSA SERIES 5 WATT Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. 80 16V 16V 70 70 60 28V 40V 50 40 60 EFFICIENCY (%) 70 EFFICIENCY (%) EFFICIENCY (%) 80 80 16V 28V 40V 50 1 2 3 4 5 30 6 OUTPUT POWER (Watts) SMSA2805S EFFICIENCY 28V 40V 50 40 40 30 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 30 1 2 3 4 5 6 100 0.1 1 100 FREQUENCY (kHz) 100µs/div 16V TO 40V SMSA2815D EFFICIENCY SMSA SERIES AUDIO REJECTION SMSA2805S STEP LINE RESPONSE FIGURE 7 20V/div. FIGURE 6 100% to 10% VIN 10% to 100% 50% to 100% 1V/div. 50mV/div. 50mV/div. 100% to 50% 100µs/div 10% 100% SMSA2805S STEP LOAD RESPONSE FIGURE 8 FIGURE 9 50% to 10% VOUT 1 ms / div 100µs/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. 10 VOUT OUTPUT POWER (Watts) FIGURE 5 100mV/div. VIN 30 20mV/div. ATTENUATION (dB) EFFICIENCY (%) 20V/div. 16V 70 –VOUT 10% to 90% 10% to 50% 200µs/div 16V TO 40V 100µs/div 10% 50%) SMSA2815D INPUT STEP LINE RESPONSE 200µs/div 10% 90% SMSA2815D +VO STEP LOAD RESPONSE SMSA2815D +VO STEP LOAD RESPONSE FIGURE 11 FIGURE 12 FIGURE 13 ® 51 DC/DC CONVERTERS SMSA SERIES 5 WATT VIN 5V/div. +VOUT –VOUT 10 5 8 4 6 4 SMSA2815D TURN-ON INTO NO LOAD 2812D 2 0 2815D –2 –4 –6 –8 –10 500µs/div –VOUT VOLTAGE CHANGE (%) –VOUT VOLTAGE CHANGE (%) 20V/div. Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. 70/30 50/50 30/70 10/90 SMSA DUAL CROSS REGULATION FIGURE 14 2805S INPUT VOLTAGE (Volts) INPUT VOLTAGE (Volts) 0 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 17 16 15 2812S 14 13 2815D 16 15 14 13 2812D 2815S 12 COND A 1 FIGURE 16 FIGURE 15 17 2 –5 90/10 OUTPUT LOAD (+VOUT % / –VOUT %) 90–10% LOAD on +V, 10-90% LOAD on –V 2812D 3 1 2 3 4 5 6 12 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 FIGURE 18 ® 52 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 300°C 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 0.025 (0.64) dia. 0.932 (23.67) 6 0.732 (18.59) 0.532 (13.51) 7 0.332 (8.43) 0.000 0.205 ±0.010 (5.21 ±0.25) 0.000 0.270 max. (6.86) 0.132 (3.35) 8 0.132 (3.35) 0.000 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. ® 53 DC/DC CONVERTERS SMSA SERIES 5 WATT TABLE 1: ELEMENT EVALUATION ELEMENT EVALUATION TEST PERFORMED (COMPONENT LEVEL) SPACE PROTOTYPE 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 SLAM™/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 SLAM™: Scanning Laser Acoustic Microscopy C-SAM: C - Mode Scanning Acoustic Microscopy ® 54 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, 125°C 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 SPACE PROTOTYPE (O) CLASS H CLASS K no yes yes yes yes yes yes yes yes yes yes yes no yes 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. ® 55 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. R: Radiation hardened – Tested lots Up to 100 k Rads (Si) total dose SEU guarantee up to 40 MeV R is referenced to (RHA) levels. ENVIRONMENTAL SCREENING LEVELS SPACE PROTOTYPE CLASS CLASS (O) H K OO HO Not available Not available HR KR MIL-PRF-38534, appendix G, Radiation Hardness Assurance TABLE 4: REPORTS: AVAILABLE FOR CUSTOMER REVIEW AT INTERPOINT 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: [email protected] Interpoint UK Phone: +44-1252-872266 Email: [email protected] 56 SMSA Rev E (05D SCPD) 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 © 1997-2004 Interpoint Corporation. All rights reserved. Interpoint France Phone: +33-134285455 Email: [email protected] ®