SMSA

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5 WATT

28 VOLT INPUT

3.3 DUAL ±12 ±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/aero- space reliability levels and optimum miniaturization. The hermeti- cally 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 moni- toring 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 typi- cally 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.

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

RECOMMENDED OPERATING CONDITIONS TYPICAL CHARACTERISTICSINHIBITABSOLUTE MAXIMUM RATINGS 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 SMSA SERIES 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 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. 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 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 V OUT is within 1% of VOUT at final value. 3. Guaranteed but not tested. SINGLE OUTPUT MODELS SMSA283R3S SMSA2805S SMSA2812S SMSA2815S PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS OUTPUT CURRENT Tc = –55°C TO +125°C VIN = 16 TO 40 VDC 0 — 1200 0 — 1000 0 — 417 0 — 333 mA OUTPUT POWER V IN = 16 TO 40 VDC OUTPUT RIPPLE VOLTAGE 10 kHz - 2 MHz — 300 600 — 150 450 — 125 500 — 150 600 mV p-p LINE REGULATION V IN = 16 TO 40 VDC Tc = –55°C TO +125°C — 10 50 — 10 50 — 10 50 — 10 50 mV LOAD REGULATION NO LOAD TO FULL Tc = –55°C TO +125°C — 10 50 — 10 50 — 10 50 — 10 50 mV INPUT VOLTAGE Tc = –55°C TO +125°C NO LOAD TO FULL CONTINUOUS 16 28 40 16 28 40 16 28 40 16 28 40 VDC TRANSIENT3 50 ms 0 — 50 0 — 50 0 — 50 0 — 50 V INPUT CURRENT NO LOAD — 35 60 — 35 60 — 35 60 — 35 60 FULL LOAD — 250 — — 250 — — 235 — — 235 — mA INHIBITED — 3 5 — 3 5 — 3 5 — 3 5 INPUT RIPPLE 10 kHz - 10 MHz — 50 200 — 50 200 — 50 200 — 50 200 mA p-pCURRENT Tc = –55°C TO +125°C — 60 300 — 60 300 — 60 300 — 60 300 EFFICIENCY 60 — — 68 74 — 69 74 — % SHORT CIRCUIT RECOVERY — 12.5 25 — 12.5 25 — 1 10 — 1 10 ms STEP LOAD 50% - 100% - 50% RESPONSE TRANSIENT — 200 500 — 200 500 — 300 750 — 400 1000 mV pk RECOVERY 2, 3 — 200 500 — 200 500 — 400 1000 — 400 1000 µs STEP LINE TRANSIENT RESPONSE2, 3 16 TO 40 VIN — 200 500 — 200 500 — 200 800 — 200 500 mV pk

40 TO 16 VIN — 200 500 — 200 500 — 250 600 — 200 500

16 TO 40 VIN — 400 1000 — 400 1000 — 700 1300 — 500 1300 µs

40 TO 16 VIN — 400 1000 — 400 1000 — 700 1300 — 500 1300

START-UP DELAY — 10 75 — 10 75 — 10 75 — 10 75 ms OVERSHOOT3 — 0 200 — 0 200 — 0 500 — 0 500 mV pk

Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified. 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. 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 V OUT is within 1% of VOUT at final value. 5. Guaranteed but not tested. DUAL OUTPUT MODELS SMSA 2805D SMSA2812D SMSA2815D PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS OUTPUT CURRENT1 VIN = 16 to 40 VDC Tc = –55°C to +125°C — ±500 800 — ±208 333 — ±167 267 mA OUTPUT POWER1 VIN = 16 to 40 VDC OUTPUT RIPPLE VOLT. 10 kHz - 2 MHz — — 300 — 80 300 — 120 300 mV p-p LINE REGULATION Vin = 16 to 40 VDC Tc = –55°C to +125°C +VOUT — 20 100 — 20 100 — 10 50 mV –VOUT — 40 200 — 40 200 — 40 180 LOAD REGULATION NO LOAD TO FULL Tc = –55°C to +125°C +VOUT — 10 120 — 10 120 — 10 50 mV –VOUT — 100 400 — 100 400 — 50 200 CROSS REGULATION2 +PO = 30 - 70 %, –P O =70 - 30% — 5 8 — 3.7 6 — 3 6 % INPUT VOLTAGE NO LOAD TO FULL CONTINUOUS 16 28 40 16 28 40 16 28 40 VDC TRANSIENT5 50 msec — — 50 — — 50 — — 50 V INPUT CURRENT NO LOAD — 30 50 — 40 63 — 38 60 FULL LOAD — 248 — — 235 — — 235 — mA INHIBITED — 3 5 — 3 5 — 3 5 INPUT RIPPLE 10 kHz TO 10 MHz — 50 200 — 50 200 — 50 200 CURRENT Tc = –55°C to +125°C — 60 300 — 60 300 — 60 300 mA p-p EFFICIENCY 65 70 — 67 73 — 68 73 — % LOAD FAULT3, 4 POWER DISSIPATION RECOVERY — — 50 — 1 30 — 1 50 ms STEP LOAD 50% - 100% - 50% BALANCED RESPONSE TRANSIENT — ±200 ±550 — ±200 ±550 — ±220 ±600 mV RECOVERY4, 5 — 200 500 — 200 500 — 200 500 µs STEP LINE RESP.4, 5 TRANSIENT

16 TO 40 VDC — ±200 ±500 — ±200 ±500 — ±600 ±1500

40 TO 16 VDC — ±200 ±500 — ±200 ±500 — ±600 ±1500

16 TO 40 VDC — 300 750 — 300 750 — 500 1200

40 TO 16 VDC — 800 2000 — 800 2000 — 500 1200

µs START-UP DELAY — 10 30 — 10 30 — 10 25 ms OVERSHOOT5 — 0 500 — 0 500 — 0 500 mV pk

= DUAL OUTPUT VR FIGURE 1: SMSA BLOCK DIAGRAM 200 pF 3.9 K 10 K Inhibit SMSA Input Common Positive Input 10 k /H9024 Vcc Typically 1.5 V when inhibited 12 k /H9024 5 k /H9024 400 /H9024 50 k /H9024 2N3904 FIGURE 2: INHIBIT INTERFACE

+C2 Case SMSA2815S Input Common Positive Input Positive Output Output Common To Load Positive Input Input Common Positive Output Output Common From input power source EMI Filter Case Negative Output +C2 + To Loads Case SMSA2815D Input Common Positive Input Positive Output Output Common Positive Input Input Common Positive Output Output Common From input power source EMI Filter Case FIGURE 3: LOW NOISE OUTPUT FILTER FOR S MSA SINGLE OUTPUT MODEL 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, µ i = 5000 Dual output: T2 = 10T #28 AWG winding on toroid, µ i = 5000 For best results, make interconnections as short as possible.

Voltage In (28V) Output Voltage Environmental Screening Number of Outputs (S = single, D = dual) Pin Single Output Dual Output

1 Positive Output Positive Output

2 Output Common Output Common

3 No connection Negative Output

4 No connection No connection

5 Inhibit Inhibit

6 Positive Input Positive Input

7 Input Common Input Common

8 Case Ground Case Ground

DRAWING (SMD) IN PROCESS 5962-9309202HXC 5962-9309302HXC 5962-9309402HXC 5962-9308902HXC 5962-9309002HXC SMSA S ERIES 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 BOTTOM VIEW SMSA 876 54321 Squared corner on header and dot on top of cover indicate pin one. FIGURE 5: PIN OUT BOTTOM VIEW See Figures 23 and 24 for dimensions.

Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. FIGURE 5 FIGURE 7 OUTPUT POWER (Watts) SMSA2815D EFFICIENCY EFFICIENCY ( 40V 12345 6 16V 28V 100µs/div 16V TO 40V SMSA2805S STEP LINE RESPONSE 20mV/div VIN20V/div VOUT OUTPUT POWER (Watts) SMSA2805S EFFICIENCY EFFICIENCY ( 40V 12345 6 16V 28V FIGURE 2 OUTPUT POWER (Watts) SMSA2812S EFFICIENCY EFFICIENCY ( 40V 12345 6 16V 28V FIGURE 3 FREQUENCY (kHz) SMSA SERIES AUDIO REJECTION ATTENUAT ION ( dB) 100 0.1 1 10 100 FIGURE 6 FIGURE 4 OUTPUT POWER (Watts) SMSA2815S EFFICIENCY EFFICIENCY ( 40V 12345 6 16V 28V FIGURE 11 FIGURE 13 200µs/div 16V TO 40V SMSA2815D INPUT STEP LINE RESPONSE 100mV/div VIN20V/div +VOUT –VOUT 200µs/div 10% 90% SMSA2815D +VO STEP LOAD RESPONSE 200mV/div 10% to 90% 90% to 10% –POUT=0.5W 100µs/div 50% 100% SMSA2805S STEP LOAD RESPONSE 50mV/div. 50% to 100% 100% to 50% FIGURE 8 100µs/div 10% 100% SMSA2805S STEP LOAD RESPONSE 50mV/div. 10% to 100% 100% to 10% FIGURE 9 100µs/div 10% 50%) SMSA2815D +VO STEP LOAD RESPONSE 100mV/div 10% to 50% 50% to 10% –POUT=2.5W FIGURE 12 FIGURE 10 1 ms / div SMSA2805S TURN-ON INTO NO LOAD 1V/div. VIN20V/div. VOUT

Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. FIGURE 17 OUTPUT POWER (Watts) 50 mV DROP SMSA LOW LINE DROPOUT VS. LOAD INPUT VOLT AGE (Volts) 12345 6 2805S 2815S 2812S 500µs/div SMSA2815D TURN-ON INTO NO LOAD 5V/div. VIN20V/div. +VOUT –VOUT FIGURE 14 OUTPUT LOAD (+VOUT % / –VOUT %) 90–10% LOAD on +V, 10-90% LOAD on –V SMSA DUAL CROSS REGULATION OUT VOLTAGE C HANGE (%) –10 90/10 70/30 50/50 30/70 10/90 2815D 2812D FIGURE 15 OUTPUT POWER (Watts) 50 mV DROP SMSA LOW LINE DROPOUT VS. LOAD INPUT VOLT AGE (Volts) 12345 6 2812D 2815D FIGURE 18 FIGURE 16 OUTPUT LOAD (%) COND. A: 50% LOAD +V; 10% to 50% –V COND. B: 50% LOAD –V; 10% to 50% +V SMSA DUAL CROSS REGULATION OUT VOLTAGE C HANGE (%) 10 20 30 40 50 2815D 2812D 2812D COND B COND A

for pin configurations. 1.075 max (27.31) Materials Header Cold Rolled Steel/Nickel/Gold Cover Cold Rolled Steel/Nickel Pins Copper/Nickel/Gold compression glass seal 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 1.075 max (27.31) 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. Dot on top of case indicates pin one 0.000 0.132 (3.35) 0.932 (23.67) 0.000 0.132 (3.35) 876 54321 0.332 (8.43) 0.532 (13.51) 0.732 (18.59) 0.932 (23.67) 0.025 (0.64) dia. 0.000 0.270 max. (6.86) SMSA Series BOTTOM VIEW CASE C1 0.205 ±0.010 (5.21 ±0.25) Projection Weld Squared corner and dot on top of case indicate pin one. FIGURE 24: CASE C1 FIGURE 23: CASE C MAXIMUM DIMENSIONS Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may ca use some distortion. Please refer to the numerical dimensions for accuracy.

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 Notes M/S Active components (Microcircuit and Semiconductor Die) P Passive components TABLE 1: ELEMENT EVALUATION ELEMENT EVALUATION SPACE PROTOTYPE CLASS CLASS TEST PERFORMED (O) H K (COMPONENT LEVEL) M/S P M/S P 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 no no no no yes no SLAM™/C-SAM: Input capacitors only no no no yes no yes (Add’l test, not req. by H or K)

TABLE 2: PRODUCT ENVIRONMENTAL SCREENING ENVIRONMENTAL SCREENING SPACE TEST PERFORMED PROTOTYPE CLASS CLASS (END ITEM LEVEL ) (O) H K Non-destruct bond pull Method 2023 no yes yes Pre-cap inspection Method 2017, 2032 yes yes yes Temperature cycle Method 1010, Cond. C yes yes yes Constant acceleration Method 2001, 3000 g yes yes yes PIND Test Method 2020, Cond. B no yes yes Radiography Method 2012 no no yes Pre burn-in test yes yes yes Burn-in, Method 1015, 125°C 96 hours yes no no 160 hours no yes no 2 x 160 hour (includes mid BI test) no no yes Final electrical test MIL-PRF-38534, Group A yes yes yes Hermeticity test Fine Leak, Method 1014, Cond. A yes yes yes Gross Leak, Method 1014, Cond. C yes yes yes Final visual inspection Method 2009 yes yes yes Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.

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. Contact Information: Interpoint Headquarters USA Phone: 1-800-822-8782 +425-882-3100 Email: power@intp.com www.interpoint.com Interpoint UK Phone: +44-1252-872266 Email: poweruk@intp.com Interpoint France Phone: +33-134285455 Email: powerfr@intp.com TABLE 3: RADIATION HARDNESS LEVELS PRODUCT LEVEL AVAILABILITY ENVIRONMENTAL SCREENING LEVELS SPACE PROTOTYPE CLASS CLASS RADIATION HARDNESS LEVELS (O) H K O: Standard, no radiation guarantee For system evaluation, electrically OO HO Not and mechanically comparable to available H and K level. R: Radiation hardened – Tested lots NotUp to 100 k Rads (Si) total dose available HR KR SEU guarantee up to 40 MeV R is referenced to MIL-PRF-38534, appendix G, Radiation Hardness Assurance (RHA) levels. TABLE 4: REPORTS: AVAILABLE FOR CUSTOMER REVIEW ATINTERPOINT 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.