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FEATURES
* * * * * * * * * * * * * * Fully qualified to Class H or K -55 to +125C operation 16 to 40 VDC input Fully Isolated Magnetic feedback Fixed frequency, 600 kHz typical Topology - Single Ended Forward Inhibit input side and output side Sync function Output trim on single output models Indefinite short circuit protection Remote sense on single output models Up to 87% efficiency Parallelable up to 180 watts
DC/DC CONVERTERS 28 VOLT INPUT
SMFL SERIES 65 WATT
MODELS
VDC OUTPUT SINGLE 3.3 5 12 15 DUAL 5 12 15
Size (max.): 3.005 x 1.505 x 0.410 inches (76.33 x 38.23 x 10.41 mm) See Figures 17 and 18 for dimensions. Case options V, W, Y, and Z are available by special order. Please refer to our databook or contact your Interpoint representative for more information. Weight: 85 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 INHIBIT
The SMFL SeriesTM 28-volt DC/DC converters are rated up to 65 watts output power over a -55 to +125C temperature range with a 28 Vdc nominal input. On dual output models up to 70% of the rated output power can be drawn from either the positive or negative outputs. Current sharing allows the units to be paralleled for total power of up to 180 watts. The welded, hermetically sealed package is only 3.0 x 1.5 x 0.40 inches, giving the series an overall power density of up to 45 watts per cubic inch. The SMFL Series converters have two TTL compatible inhibit terminals (INH1 and INH2) that can be used to disable power conversion, resulting in a very low quiescent input current and no generation of switching noise. An open collector TTL compatible low (<0.8 volts) is required to inhibit the converter between INH1 (pin 4) and Input Common (pin 2). An open collector TTL compatible low (<0.5 volts) is required to inhibit the converter between INH2 (pin 12) and Output Common (pin 8). The application of intermediate voltages to these pins (1.5 to 10.5 volts) should be avoided.
SCREENING AND REPORTS
SMFL converters offer three screening options (Space prototype, Class H, or Class K) and two levels of radiation hardness (O or R). See Tables 1, 2, and 3 for more information. Detailed reports on product performance are also available and are listed in Table 4.
SYNC
Converters may be synced to an external clock (525 to 675 kHz) or to one another by using the sync in or out pins. The nominal freerun switching frequency is 600 kHz.
DESIGN FEATURES
The SMFL Series converters are switching regulators that use a quasi-square wave, single ended forward converter design with a constant switching frequency of 600 kHz typical. Isolation between input and output circuits is provided with a transformer in the forward path and a wide bandwidth magnetic coupling in the feedback control loop. The SMFL uses a unique dual loop feedback technique that controls output current with an inner feedback loop and an output voltage with a cascaded voltage mode feedback loop. The additional secondary current mode feedback loop improves transient response in a manner similar to primary current mode control and allows for ease of paralleling, but without the cost and complexity. The constant frequency, pulse-width modulated converters use a quasi-square wave single-ended forward design. Tight load regulation is achieved through a wide-bandwidth magnetic feedback circuit. The output voltage on single SMFL models can be trimmed to a specific output voltage by adding an external resistor.
CURRENT AND PARALLEL OPERATION
Multiple single output SMFL converters may be used in parallel to drive a common load. In this mode of operation the load current is shared by two or three SMFL converters. In current sharing mode, one SMFL converter is designated as a master. The SLAVE pin (pin 11) of the master is left unconnected and the MSTR/INH2 pin (pin 12) of the master is connected to the SLAVE pin (pin 11) of the slave units. The units designated as slaves have the MSTR/INH2 pin (pin 12) connected to the SNS RTN pin (pin 9). Note that synchronizing the units together is not required for current sharing operation. A second slave unit may be placed in parallel with a master and slave; this requires the TRI pin (pin 3) of the master unit to be connected to the SNS RTN pin (pin 9). See Figure 2 for a block diagram of parallel connections. When paralleled, 95% of the total combined power ratings of the SMFL converters are available at the load. Overload and short circuit performance are not adversely affected during parallel operation.
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SMFL SERIES 65 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage * 16 to 40 VDC Power Dissipation (Pd) * 14 watts (16 watts SMFL2805S, SMFL2805D) Output Power * 40 to 65 watts depending on model Lead Soldering Temperature (10 sec per lead) * 300C Storage Temperature Range (Case) * -65C to +150C
DC/DC CONVERTERS
SYNC AND INHIBIT (INH1, INH2)
Sync In (525 to 675 kHz) * Duty cycle 40% min, 60% max * Logic low 0.8 V max * Logic high 4.5 V min, 9 V max * Referenced to input common * If not used, connect to input common Sync Out * Referenced to input common * If not used, leave unconnected Inhibit (INH1, INH2) TTL Open Collector * Logic low (output disabled) INH1 referenced to input common Logic low 0.8 V max Inhibit pin current 10 mA max INH2 referenced to output common Logic low 0.5 V max Inhibit pin current 5 mA max * Logic high (output enabled) Open collector * If not used, leave unconnected
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient * 100 ppm/C typical Input to Output Capacitance * 150 pF, typical Isolation * 100 megohm minimum at 500 V Audio Rejection * 50 dB typical Conversion Frequency * Free run mode 600 kHz typical 550 kHz. min, 650 kHz max * External sync range 525 to 675 kHz Inhibit Pin Voltage (unit enabled) * INH1 = 9 to12 V, INH2 = 6 to 9 V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range * 16 to 40 VDC continuous Case Operating Temperature (Tc) * -55C to +125C full power
PINS NOT USED
TR1, Master, and Slave If not used, leave unconnected
Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified.
SINGLE OUTPUT MODELS PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT OUTPUT POWER OUTPUT RIPPLE VOLTAGE 10 k - 2 MHz LINE REGULATION LOAD REGULATION INPUT VOLTAGE INPUT CURRENT CONDITION Tc = 25C VIN = 16 TO 40 VDC VIN = 16 TO 40 VDC Tc = 25C Tc = -55C to +125C VIN = 16 to 40 VDC NO LOAD TO FULL CONTINUOUS TRANSIENT1, 4 50 ms NO LOAD FULL LOAD INHIBITED - INH1 INHIBITED - INH2 INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT2 10 kHz - 10 MHz Tc = 25C POWER DISSIPATION SHORT CIRCUIT Tc = 25C RECOVERY STEP LOAD RESP. 50% - 100% - 50% TRANSIENT RECOVERY3, 4 16 - 40 - 16 VDC TRANSIENT RECOVERY DELAY OVERSHOOT4 SMFL283R3S MIN 3.27 0 0 -- -- -- -- 16 -- -- -- -- -- -- 70 TYP MAX 3.3 3.33 -- -- 10 10 0 -- 28 -- 70 -- 9 35 15 -- 12 40 35 50 20 20 40 50 100 2.1 14 70 50 -- SMFL2805S MIN 4.95 0 0 -- -- -- -- 16 -- -- -- -- -- -- 75 TYP MAX 5.00 5.05 -- -- 15 30 0 -- 28 -- 70 -- 9 35 15 80 10 50 35 50 20 20 40 50 120 2.5 14 70 50 -- SMFL2812S MIN TYP MAX 11.88 12.00 12.12 0 0 -- -- -- -- 16 -- -- -- -- -- -- 81 -- -- 30 45 0 -- 28 -- 50 -- 9 35 15 86 5 60 75 100 20 20 40 50 80 2.8 14 70 50 -- SMFL2815S MIN TYP MAX 14.85 15.00 15.15 0 0 -- -- -- -- 16 -- -- -- -- -- -- 82 -- -- 30 45 0 -- 28 -- 50 -- 9 35 15 87 4.33 65 85 110 20 20 40 50 80 3.0 14 70 50 -- mA pp % UNITS VDC A W mV p-p mV mV VDC V mA A mA
-- -- -- -- -- -- -- --
12.5 1.5 200 1.5 250 200 3.5 0
14 4 300 3.0 300 30 6 25
-- -- -- -- -- -- -- --
12.5 1.5 250 1.5 250 200 3.5 0
16 4 350 3.0 300 300 6 25
-- -- -- -- -- -- -- --
10 1.5 450 1.5 250 200 3.5 0
14 4 700 3.0 400 300 6 50
-- -- -- -- -- -- -- --
10 1.5 500 1.5 250 200 3.5 0
14 4 700 3.0 400 300 6 50
W ms mV p ms mV pk s ms mV pk
STEP LINE RESP3, 4.
START-UP
Notes 1. Unit will shut down above approximately 45V but will be undamaged and will restart when voltage drops into normal range. 2. Indefinite short circuit protection not guaranteed above 125C case.
3. Recovery time is measured from application of the transient to point at which Vout is within 1% of final value. 4. Guaranteed but not tested.
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DC/DC CONVERTERS
DUAL OUTPUT MODELS PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT1 CONDITIONS +VOUT Tc = 25C -VOUT VIN = 16 TO 40 VDC EACH OUTPUT TOTAL OUTPUT OUTPUT POWER OUTPUT RIPPLE VOLTAGE VOUT LINE REGULATION 10 kHz - 2 MHz VIN = 16 TO 40 VDC +VOUT -VOUT LOAD REGULATION NO LOAD TO FULL +VOUT -VOUT -- CROSS REGULATION INPUT VOLTAGE INPUT CURRENT SEE NOTE 2 SEE NOTE 3 CONTINUOUS TRANSIENT4, 7 50 ms. NO LOAD FULL LOAD INHIBITED - INH1 INHIBITED - INH2 10 kHz - 10 MHz BALANCED LOAD POWER DISSIPATION SHORT CIRCUIT RECOVERY 50 %-100%- 50% LOAD TRANSIENT RECOVERY6, 7 16 - 40 - 16 VIN TRANSIENT7 RECOVERY DELAY OVERSHOOT7 -- 25 -- -- 16 -- -- -- -- -- -- 75 -- -- -- -- -- -- -- -- 0 100 5 3 28 -- 50 -- 9 35 15 80 12.5 1.5 250 1.5 250 200 3.5 0 50 -- 8 6 40 50 120 2.40 14 70 50 -- 16 4.0 350 3.0 300 300 6 25 -- 50 -- -- 16 -- -- -- -- -- -- 81 -- -- -- -- -- -- -- -- 10 120 2 2 28 -- 50 -- 9 35 15 86 10 1.5 450 1.5 250 200 3.5 0 100 -- 4 4 40 50 100 2.80 14 70 50 -- 14 4.0 600 3.0 400 300 6 50 -- 50 -- -- 16 -- -- -- -- -- -- 82 -- -- -- -- -- -- -- -- 10 150 2 2 28 -- 50 -- 9 35 15 87 10 1.5 500 1.5 250 200 3.5 0 100 4 4 40 50 100 3.00 14 70 50 -- 14 4.0 600 3.0 400 300 6 50 -- -- 0 25 50 100 -- -- 0 25 50 100 -- -- 0 25 50 100 -- 50 100 -- 50 120 -- 50 150 VIN = 16 TO 40 VDC 0 0 0 -- -- -- 7 10 50 0 0 0 -- -- -- 3.5 5 60 0 0 0 -- -- -- 3.03 4.33 65 SMFL2805D MIN TYP MAX 4.95 5.00 5.05 4.92 5.00 5.08 SMFL2812D MIN TYP MAX 11.88 12.00 12.12 11.82 12.00 12.18 SMFL2815D MIN TYP MAX 14.85 15.00 15.15 14.77 15.00 15.23
SMFL SERIES 65 WATT
UNITS VDC
Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, radiation level O, unless otherwise specified.
A W
mV p-p
mV
mV % VDC V mA A mA mA p-p % W ms mV pk ms mV pk s ms mV pk
INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT5
STEP LOAD RESPONSE VOUT STEP LINE 6, 7 RESPONSE VOUT START-UP
Notes 1. Up to 70% of the total output power is available from either output providing the opposite output is simultaneously carrying 30% of the total power. 2. Effect on the negative output under the following conditions: +Pout 30% to 70%; -Pout 70% to 30% 3. Effect on the negative output under the following conditions: +Pout 50%; -Pout 10% to 50%
4. Unit will shut down above approximately 45V but will be undamaged and will restart when voltage drops into normal range. 5. Indefinite short circuit protection not guaranteed above 125C case. 6. Recovery time is measured from application of the transient to point at which Vout is within 1% of final value. 7. Guaranteed but not tested.
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SMFL SERIES 65 WATT
28V + -
DC/DC CONVERTERS
SINGLE OUTPUT MODELS CONNECTION DIAGRAMS - SENSE AND PARALLEL
1 2 3 Inhibit 4 5 6 MSTR/INH2 12 Slave 11 Pos. Sense 10 9 8 7 + RL Positive Input Input Common TR1 INH1 Sync Out Sync In
Sense Return
-
Output Common Positive Output
Sync In
REMOTE SENSE CONNECTION 1 2 3 Inhibit Sync In 4 5 6 MSTR/INH2 12 11 Slave 10 Pos. Sense 9 Sense Return 8 Output Common 7 Positive Output
28V
+ -
Positive Input Input Common TR1 INH1 Sync Out Sync In
RA - + RL
OUTPUT VOLTAGE ADJUST CONNECTION VOUT INCREASE (VOLT) 0.1 0.2 0.3 0.4 0.5 RA (OHMS) 12-V 15-V 25 20 50 75 100 125 40 60 80 100
5-V 70 140 210 280 350
FIGURE 1: SENSE CONNECTIONS AND TRIM TABLE
28V
+ -
1 2 3 4 5 6
Positive Input Input Common TR1 INH1 Sync Out Sync In
MSTR/INH2 12 Slave 11 Pos. Sense Sense Return
10 9 8 7
Inhibit Sync In
MASTER
- + RL
Output Common Positive Output
CONNECT ONLY WHEN 2 SLAVES ARE USED 1 2 3 4 5 6
Positive Input Input Common TR1 INH1 Sync Out Sync In
MSTR/INH2 12 Slave 11 Pos. Sense 10 Sense Return 9 Output Common 8 Positive Output
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SLAVE 1
1 2 3 4 5 6
Positive Input Input Common TR1 INH1 Sync Out Sync In
MSTR/INH2 12 Slave 11 Pos. Sense 10 Sense Return 9 Output Common 8 Positive Output
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SLAVE 2
FIGURE 2: PARALLEL CONNECTIONS
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DC/DC CONVERTERS
PIN OUT Pin 1 2 3 4 5 6 7 8 9 10 11 12 Single Output Positive Input Input Common Triple (TRI) Inhibit 1 (INH1) Sync Out Sync In Positive Output Output Common Sense Return Positive Sense Slave Master / Inhibit 2 Dual Output Positive Input Input Common Triple (TRI) Inhibit 1 (INH1) Sync Out Sync In Positive Output Output Common Negative Output No connection Slave Master / Inhibit 2 Angled corner indicates pin one.
SMFL SERIES 65 WATT
1 2 3 4 5 6
12 11
TOP VIEW SMFL (Pin side, marked side)
10 9 8 7
Pin 6 should be connected to input common if external sync (Sync In) is not used. Sense pins must be connected to their respective outputs if not used.
See Figures 17 and 18 for dimensions.
FIGURE 3: PIN OUT
SMD NUMBERS
STANDARD MICROCIRCUIT DRAWING (SMD) SMFL SERIES SIMILAR PART SMFL283R3S/HO SMFL2805S/HO SMFL2812S/HO SMFL2815S/HO SMFL2805D/HO SMFL2812D/HO SMFL2815D/HO
MODEL NUMBERING KEY
Base Model Input Voltage Output Voltage Number of Outputs (S = single, D = dual) Screening Radiation Level SMFL 28 05 S / K R
IN PROCESS 5962-9316302HXC IN PROCESS IN PROCESS IN PROCESS IN PROCESS 5962-9319302HXC
The SMD number shown is for Class H screening, nonflanged, 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 SMFL SMD releases which are "in process." SMDs can be downloaded from http://www.dscc.dla.mil/programs/smcr
Typical Performance Curves: 25C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.
90 85 16V 90 85 16V 90 85 16V
Efficiency (%)
Efficiency (%)
Efficiency (%)
80 75
28V
80 75 70 65
28V
80 75 70 65 40V
28V
40V 70 65 60 10 20 30 40 50
40V
Output (Watts)
60 10
20
30
40
50
60
60 10
20
30
40
50
60 65
Output Power (Watts)
Output Power (Watts)
SMFL2805S & SMFL2805D Efficiency
SMFL2812S & SMFL2812D Efficiency
SMFL2815S & SMFL2815D Efficiency
FIGURE 4
FIGURE 5
FIGURE 6
5
SMFL SERIES 65 WATT
90 16 VIN 85 80 75 70 65 60 0 10 20 30 40 50 60 70 40 VIN 28 VIN
DC/DC CONVERTERS
0. 20.
Typical Performance Curves: 25C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.
Attenuation (dB)
Efficiency (%)
100mV/div. 20V/div.
Vout
40. 60. 80.
Vin
100. 0.1
1
10
100
Output Power (Watts)
Frequency (kHz)
SMFL2828S Efficiency
SMFL Series Audio Rejection
50 s/div 16 to 40 V
SMFL2805S Step Line Response
FIGURE 7
FIGURE 8
FIGURE 9
100% to 50%
20V/div.
Vin
20V/div. 100mV/div.
1ms/div No Load
Vin +Vout
100mV/div.
1V/div.
50% to 100%
Vout
-Vout
1ms/div
SMFL2805S Step Load Response
SMFL2805S Turn On Response
50 s/div 16 to 40 V
SMFL2815D Step Line Response
FIGURE 10
FIGURE 11
8
FIGURE 12
20V/div.
50% to 100%
-Pout = 32.5W
-Vout Voltage Change (%)
6 4 2 0 -2 -4 -6 -8 30 40 50 60 70 SMFL2805D SMFL2812D SMFL2815D
VIN
+Vout
200mV/div.
100% to 50%
5V/div.
-Vout
1ms/div
SMFL2815D Step Load Response
1ms/div No Load
SMFL2815D Turn On Response
Output Load (%) +Pout 80 to 20 %, -Pout 20 to 80%
Cross Regulation
FIGURE 13
16 SMFL2815S & 15D
FIGURE 14
FIGURE 15
Input Voltage (Volts)
15 14 13
SMFL2805S & 5D 12 SMFL2812S & 12D 11 10 20 30 40 50 60 65
Output Power (Watts)
Low Line Dropout
FIGURE 16
6
DC/DC CONVERTERS
Angled corner indicates pin one
SMFL SERIES 65 WATT
1.505 max (38.23)
CASE U TOP VIEW (PIN SIDE) See Figure 18 for dimensions
3.005 (76.33) max.
Materials Header Cold Rolled Steel/Nickel/Gold Cover Kovar/Nickel Pins #52 alloy/Gold compression glass seal
FIGURE 17: CASE U MAXIMUM DIMENSIONS
Angled corner indicates pin one. 1.505 (38.23) max. 1.380 (35.05) 1.250 (31.75) 1.050 (26.67) 0.850 (21.59) 0.650 (16.51) 0.450 (11.43) 0.250 (6.35) 0.120 (3.05) 0.000
Seam Seal
0.23 (5.8) Lead Length 0.128 dia (3.25). 0.040 dia (1.02) 1 2 3 12 11 10
TOP VIEW CASE U
4 5 6 9 8 7
0.120 (3.05) 0.250 (6.35)
2.750 (69.85)
2.880 (73.15) 3.005 (76.33) max.
0.410 (10.41) max.
FIGURE 18: CASE U 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.
Case dimensions in inches (mm) Tolerance 0.005 (0.13) for three decimal places, 0.01 (0.2) for two decimal places unless otherwise specified 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.
0.050 (1.27) 0.000
0.220 (5.59
0.000
7
SMFL SERIES 65 WATT
DC/DC CONVERTERS
TABLE 1: ELEMENT EVALUATION ELEMENT EVALUATION TEST PERFORMED (COMPONENT LEVEL) 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) 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
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 Active components (Microcircuit and Semiconductor Die) P 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
8
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
SMFL SERIES 65 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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SMFL SERIES 65 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
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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SMFL Rev E 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. SMFL Series is a trademark of Interpoint. Copyright (c) 1999-2003 Interpoint. All rights reserved.

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