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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
DC/DC CONVERTERS 28 VOLT INPUT
SMSA SERIES 5 WATT
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 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.
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%.
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.
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.
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.
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SMSA SERIES 5 WATT
ABSOLUTE MAXIMUM RATINGS
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
DC/DC CONVERTERS
INHIBIT
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
TYPICAL CHARACTERISTICS
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) * -55C to +125C full power * -55C to +135C absolute Derating Output Power/Current (Tc) * Linearly from 100% at 125C to 0% at 135C
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 VIN = 16 TO 40 VDC Tc = -55C TO +125C 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 NO LOAD TO FULL CONTINUOUS TRANSIENT3 50 ms NO LOAD FULL LOAD INHIBITED 10 kHz - 10 MHz Tc = -55C TO +125C POWER DISSIPATION RECOVERY 50% - 100% - 50% TRANSIENT RECOVERY 2, 3 TRANSIENT 16 TO 40 VIN 40 TO 16 VIN RECOVERY 16 TO 40 VIN START-UP 40 TO 16 VIN DELAY OVERSHOOT3 -- -- -- -- 400 400 10 0 1000 1000 75 200 -- -- -- -- 400 400 10 0 1000 1000 75 200 -- -- -- -- 700 700 10 0 1300 1300 75 500 -- -- -- -- 500 500 10 0 1300 1300 75 500 s ms mV pk -- -- -- -- -- 300 10 10 4 600 50 50 -- -- -- -- -- 150 10 10 5 450 50 50 -- -- -- -- -- 125 10 10 5 500 50 50 -- -- -- -- -- 150 10 10 5 600 50 50 W mV p-p mV mV SMSA283R3S MIN TYP MAX 3.25 3.30 3.35 0 -- 1200 SMSA2805S MIN TYP MAX 4.95 5.00 5.05 0 -- 1000 SMSA2812S MIN TYP MAX 11.88 12.00 12.12 0 -- 417 SMSA2815S MIN TYP MAX 14.85 15.00 15.15 0 -- 333 UNITS VDC mA
INPUT CURRENT
INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT1, 2 SHORT CIRCUIT STEP LOAD RESPONSE STEP LINE RESPONSE2, 3
16 0 -- -- -- -- -- 60 -- -- -- -- -- --
28 -- 35 250 3 50 60 -- 1.5 12.5 200 200 200 200
40 50 60 -- 5 200 300 -- 2.4 25 500 500 500 500
16 0 -- -- -- -- -- 68 -- -- -- -- -- --
28 -- 35 250 3 50 60 74 1.5 12.5 200 200 200 200
40 50 60 -- 5 200 300 -- 2.0 25 500 500 500 500
16 0 -- -- -- -- -- 69 -- -- -- -- -- --
28 -- 35 235 3 50 60 74 1.2 1 300 400 200 250
40 50 60 -- 5 200 300 -- 1.9 10 750 1000 800 600
16 0 -- -- -- -- -- % -- -- -- -- -- --
28 -- 35 235 3 50 60 1.2 1 400 400 200 200
40 50 60 -- 5 200 300 1.8 10 1000 1000 500 500
VDC V mA
mA p-p W ms mV pk s
mV pk
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.
3. Guaranteed but not tested.
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DC/DC CONVERTERS
DUAL OUTPUT MODELS PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT1 OUTPUT POWER1 OUTPUT RIPPLE VOLT. LINE REGULATION CONDITIONS +VOUT -VOUT VIN = 16 to 40 VDC Tc = -55C to +125C VIN = 16 to 40 VDC Tc = -55C to +125C 10 kHz - 2 MHz Vin = 16 to 40 VDC Tc = -55C to +125C +VOUT -VOUT LOAD REGULATION NO LOAD TO FULL Tc = -55C to +125C +VOUT -VOUT CROSS REGULATION2 INPUT VOLTAGE +PO = 30 - 70 %, -PO =70 - 30% -PO = 30 - 70 %, +PO = 70 - 30% NO LOAD TO FULL CONTINUOUS TRANSIENT5 50 msec NO LOAD FULL LOAD INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT3, 4 INHIBITED 10 kHz TO 10 MHz Tc = -55C to +125C POWER DISSIPATION SHORT CIRCUIT RECOVERY 50% - 100% - 50% BALANCED TRANSIENT RECOVERY4, 5 STEP LINE RESP.4, 5 16 TO 40 VDC TRANSIENT 40 TO 16 VDC RECOVERY START-UP 16 TO 40 VDC 40 TO 16 VDC DELAY OVERSHOOT5 -- -- -- 10 100 5 120 400 8 -- -- -- 10 100 3.7 120 400 6 -- -- -- -- -- 20 40 100 200 -- -- 20 40 100 200 -- -- MIN 4.95 4.9 -- -- -- SMSA 2805D TYP 5.00 5.0 500 -- -- MAX 5.05 5.1 800 5 300 SMSA2812D MIN 11.88 11.76 -- -- -- TYP 12.00 12.00 208 -- 80 MAX 12.12 12.24 333 5 300
SMSA SERIES 5 WATT
SMSA2815D MIN 14.85 14.70 -- -- -- TYP 15.00 15.00 167 -- 120 MAX 15.15 15.30 267 5 300 mA W mV p-p UNITS VDC
Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified.
10 40
50 180
mV
10 50 3
50 200 6
mV
%
16 -- -- -- -- -- -- 65 -- -- -- -- -- -- -- -- -- --
28 -- 30 248 3 50 60 70 1.3 -- 200 200 200 200 300 800 10 0
40 50 50 -- 5 200 300 -- 2.1 50 550 500 500 500 750 2000 30 500
16 -- -- -- -- -- -- 67 -- -- -- -- -- -- -- -- -- --
28 -- 40 235 3 50 60 73 1.3 1 200 200 200 200 300 800 10 0
40 50 63 -- 5 200 300 -- 1.7 30 550 500 500 500 750 2000 30 500
16 -- -- -- -- -- -- 68 -- -- -- -- -- -- -- -- -- --
28 -- 38 235 3 50 60 73 1.3 1 220 200 600 600 500 500 10 0
40 50 60 -- 5 200 300 -- 1.6 50 600 500 1500 1500 1200 1200 25 500
VDC V mA
INPUT CURRENT
mA p-p % W ms mV s mV pk s ms mV pk
STEP LOAD RESPONSE
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 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. Guaranteed but not tested.
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SMSA SERIES 5 WATT
Positive 6 Input
DC/DC CONVERTERS
Output Filter 1 Positive Output
Inhibit 5 PWM Control
Error Amp
VR 2 Output Common
Input 7 Common Case 8 Ground Feedback
Output Filter
3
Negative Output
= DUAL OUTPUT
FIGURE 1: SMSA BLOCK DIAGRAM
Positive 6 Input
SMSA
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
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DC/DC CONVERTERS
EMI Filter Positive Input From input power source Input Common Output Common Positive Output Case SMSA2815S Positive Input Positive Output Output Common Input Common Case C1 T1 C2
SMSA SERIES 5 WATT
+ C3 To Load
T1
FIGURE 3: LOW NOISE OUTPUT FILTER FOR S MSA SINGLE OUTPUT MODEL
EMI Filter Positive Input From input power source Input Common Output Common Positive Output Case
SMSA2815D Positive Input Positive Output Output Common Input Common Negative Output Case C1
T1 C2 C4 + C3 To Loads + C5
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.
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SMSA SERIES 5 WATT
DC/DC CONVERTERS
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
STANDARD MICROCIRCUIT DRAWING (SMD) SMSA SERIES SIMILAR PART SMSA283R3S/HO SMSA2805S/HO SMSA2812S/HO SMSA2815S/HO SMSA2812D/HO SMSA2815D/HO
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
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
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DC/DC CONVERTERS
80 16V 70 70 80 16V 70 80 16V
SMSA SERIES 5 WATT
Typical Performance Curves: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
EFFICIENCY (%)
EFFICIENCY (%)
60
28V 40V
60
28V 40V
EFFICIENCY (%)
60
28V 40V
50
50
50
40
40
40
30
1
2
3
4
5
6
30
30 1 2 3 4 5 6
1
2
3
4
5
6
OUTPUT POWER (Watts)
SMSA2805S EFFICIENCY
OUTPUT POWER (Watts)
OUTPUT POWER (Watts)
SMSA2812S EFFICIENCY
SMSA2815S EFFICIENCY
FIGURE 2
80
FIGURE 3
FIGURE 4
70
10
ATTENUATION (dB)
20 30 40 50 60 70 80 90
20V/div.
1 10 100
16V
EFFICIENCY (%)
VIN
60 28V 50 40V
30
1
2
3
4
5
6
100 0.1
20mV/div.
40
VOUT
OUTPUT POWER (Watts)
FREQUENCY (kHz)
100s/div 16V TO 40V
SMSA2815D EFFICIENCY
SMSA SERIES AUDIO REJECTION
SMSA2805S STEP LINE RESPONSE
FIGURE 5
FIGURE 6
FIGURE 7
100% to 50%
100% to 10%
20V/div. 1V/div.
VIN
50mV/div.
50mV/div.
50% to 100%
10% to 100%
VOUT
100s/div 50% 100%
100s/div 10% 100%
1 ms / div
SMSA2805S TURN-ON INTO NO LOAD
SMSA2805S STEP LOAD RESPONSE
SMSA2805S STEP LOAD RESPONSE
FIGURE 8
FIGURE 9
FIGURE 10
20V/div.
50% to 10% VIN
-POUT=2.5W 90% to 10%
-POUT=0.5W
100mV/div.
100mV/div.
+VOUT
-VOUT 10% to 50%
200mV/div.
10% to 90%
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
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FIGURE 12
FIGURE 13
51
SMSA SERIES 5 WATT
DC/DC CONVERTERS
Typical Performance Curves: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
10 5
-VOUT VOLTAGE CHANGE (%)
-VOUT VOLTAGE CHANGE (%)
8 6 4 2 0 -2 -4 -6 -8 -10 90/10 70/30 50/50 30/70 10/90 2815D 2812D
4 3 2 COND A 1 0 -1 -2 -3 -4 -5 10 20 30 40 50 2812D COND B 2815D 2812D
20V/div. 5V/div.
VIN +VOUT
-VOUT
500s/div
SMSA2815D TURN-ON INTO NO LOAD
OUTPUT LOAD (+VOUT % / -VOUT %) 90-10% LOAD on +V, 10-90% LOAD on -V
SMSA DUAL CROSS REGULATION
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 14
FIGURE 15
FIGURE 16
17
17 2805S
INPUT VOLTAGE (Volts)
15 2812S 14
INPUT VOLTAGE (Volts)
16
16
2815D
15
14
13 2815S 12
13 2812D 12
1
2
3
4
5
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
FIGURE 18
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DC/DC CONVERTERS
Dot on top of case indicates pin one 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.
SMSA SERIES 5 WATT
CASE C BOTTOM VIEW See Figure 24 for pin configurations.
1.075 max (27.31)
FIGURE 23: CASE C MAXIMUM DIMENSIONS
BOTTOM VIEW CASE C1 SMSA Series
Projection Weld
0.932 (23.67) 0.025 (0.64) dia.
Squared corner and dot on top of case indicate pin one.
1 2 3 4 5
0.132 (3.35) 0.000 0.270 max. (6.86) 0.000 0.000 0.205 0.010 (5.21 0.25)
8
7
6
0.132 (3.35)
0.332 (8.43)
0.532 (13.51)
0.732 (18.59)
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.
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0.932 (23.67)
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SMSA SERIES 5 WATT
DC/DC CONVERTERS
TABLE 1: ELEMENT EVALUATION ELEMENT EVALUATION TEST PERFORMED (COMPONENT LEVEL) SPACE PROTOTYPE CLASS (O) H M/S P M/S P yes no no no no no no no no no no no no no no no no no no no no no no no no no no no no no yes yes yes no no no no no no no no yes yes no no
CLASS K M/S P yes yes no yes yes no no no no yes yes yes yes no yes
Element Electrical Element Visual Internal Visual Temperature Cycling Constant Acceleration Interim Electrical Burn-in Post Burn-in Electrical Steady State Life Voltage Conditioning /Aging Visual Inspection Final Electrical Wire Bond Evaluation SEM SLAMTM/C-SAM: Input capacitors only (Add'l test, not req. by H or K)
yes yes yes yes no no no no no no no no no yes yes yes yes yes yes yes no no
yes yes yes yes no yes yes no
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
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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 SPACE PROTOTYPE (O) no yes yes yes no no yes yes no no yes
SMSA SERIES 5 WATT
CLASS H yes yes yes yes yes no yes no yes no yes
CLASS K yes yes yes yes yes yes yes no no 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.
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SMSA SERIES 5 WATT
DC/DC CONVERTERS
TABLE 3: RADIATION HARDNESS LEVELS ENVIRONMENTAL SCREENING LEVELS SPACE PROTOTYPE CLASS CLASS (O) H K OO HO Not available
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.
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: 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
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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 (c) 1997-2004 Interpoint Corporation. All rights reserved.
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