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| FEATURES * * * * * -55C to +85C operation 16 to 32 VDC input Fully isolated Opto-coupler feedback Switching frequency Single and dual outputs typical 80 kHz, variable freq. Triple output - 200 kHz, fixed Topology - Flyback 40 V for 50 ms transient protection Inhibit function Indefinite short circuit protection Up to 70% efficiency External capacitors required DC/DC CONVERTERS 28 VOLT INPUT MSR SERIES 4 WATT MODELS VDC OUTPUT SINGLE DUAL TRIPLE 5 12 +5 & 12 15 +5 & 15 * * * * * * Size (max.): 1.075 x 1.075 x 0.370 inches (27.31 x 27.31 x 9.40 mm). See Section B8, case C2, for dimensions. Weight: 20 grams maximum. Screening: Standard or ES.See Section C2 for screening options, see Section A5 for ordering information. DESCRIPTION The MSR SeriesTM DC/DC converters provide the high efficiencies associated with switching regulators, yet have full isolation between input and output. Interpoint builds the MSR converters using thickfilm hybrid technology and seals them in metal packages for military, aerospace, and other high-reliability applications. The solder sealed packages of the standard models pass a dip gross leak hermeticity test. Environmentally screened models pass a fine leak hermeticity test. See Section C2 for a complete list of screening options. INHIBIT FUNCTION The open collector TTL compatible inhibit terminal is referenced to input common. Inhibiting the converter by pulling the inhibit terminal (pin 15) low results in an input current as low as 2 mA for the MSR2805S. The inhibit terminal has an open circuit voltage of 12 to 28 V. SHORT CIRCUIT PROTECTION Each output has current limiting circuitry for indefinite short circuit protection providing that the case temperature does not exceed the specified limits. Under short circuit conditions the input current is reduced to less than full load input current and the output short circuit current remains higher than full load output current. CONVERTER DESIGN A footprint of just over one square inch makes the MSR Series DC/DC converters one of Interpoint's smallest converters. These converters incorporate a flyback topology which requires a minimum of components resulting in small package size. Single and dual models self-oscillate at an operating frequency which is an approximate inverse function of the load. At full load, the frequency is typically 80 kHz for single and dual output models. Triple output models operate at a fixed frequency of approximately 200 kHz. A transformer in the forward power circuit and an opto-coupler in the feedback/control loop maintain input to output isolation. MINIMAL HEAT SINKING The MSR Series converters' high efficiency minimizes heat sinking requirements, but care should be taken to remove self-generated heat to prevent exceeding the maximum case temperature. Heat conducting material (PCB, copper sheet, heat sink, etc.) in contact with the converter's baseplate can help to increase heat dissipation. The converter can be operated at full load at a case temperature of 85C, with the output power derated linearly to zero at 115C. CONVERTER OPERATION MSR Series DC/DC converters feature an input voltage range of 16 to 32 VDC and can withstand a transient of up to 40 V for up to 50 msec. They offer a choice of five different output voltage (VDC) configurations: +5 , 12 , 15, +5 main with 12 auxiliaries, and +5 main with 15 auxiliaries. Dual output models deliver up to 4 watts for either balanced or unbalanced loads, however, at least 25% of the total load should be on the positive output. The single output model supplies up to 3.5 watts of output power while the triple output models supply up to 3.2 watts. The high efficiency remains almost constant over the entire input voltage range and from approximately 25% of full load to full load. This makes the MSR Series converters ideal for either battery or aircraft power applications. WARNING: EXTERNAL CAPACITORS REQUIRED External capacitors are required on the outputs. Operating the unit without external capacitors will result in damage to the internal circuitry. Minimum recommended capacitor values are given in Tables 1 and 2. For optimum performance, low ESR (Equivalent Series Resistance) solid tantalum capacitors are required. The specifications on the following pages are based on the use of highquality solid tantalums. Operation with different types of capacitors will seriously affect performance. B4-27 MSR SERIES 4 WATT ABSOLUTE MAXIMUM RATINGS Input Voltage * 16 to 32 VDC Output Power * 3.2 to 4 watts depending on model Lead Soldering Temperature (10 sec per lead) * 300C Storage Temperature Range (Case) * --65C to +150C DC/DC CONVERTERS INHIBIT Inhibit TTL Open Collector * Logic low (output disabled) 0.8 V * Referenced to input common * Logic high (output enabled) 12 V Open collector TYPICAL CHARACTERISTICS Output Voltage Temperature Coefficient * MSR2805S 100 ppm/C typ, 200 max. * MSR28XXD 50 ppm/C typ * MSR285XXT 100 ppm/C typ Input to Output Capacitance * 60 pF typical Isolation * 100 megohm minimum at 500 V Conversion Frequency * Single and dual output models, 80 kHz at full load typical, variable frequency * Triple output models, 200 kHz typical fixed frequency Inhibit Pin Voltage (unit enabled) * 12 to 28 V RECOMMENDED OPERATING CONDITIONS Input Voltage Range * 16 to 32 VDC continuous * 40 V for 50 msec transient Case Operating Temperature (Tc) * -55C to +85C full power * -55C to +115C absolute Derating Output Power/Current * Linearly from 100% at 85C to 0% at 115C WARNING: EXTERNAL CAPACITORS REQUIRED Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified. SINGLE AND DUAL OUTPUT MODELS PARAMETER1 OUTPUT VOLTAGE OUTPUT CURRENT OUTPUT POWER OUTPUT RIPPLE LINE REGULATION LOAD REGULATION INPUT VOLTAGE 16 TO 32 VIN Tc = -55C TO +85C BW = DC TO 1 MHz 16 TO 32 VIN NO LOAD TO FULL Tc = -55C TO +85C TRANSIENT 50 ms INPUT CURRENT NO LOAD FULL LOAD INHIBITED EFFICIENCY CONDITIONS MIN 4.90 -- -- -- -- -- 16 -- -- -- -- 65 MSR2805S TYP 5.0 -- -- 75 5 25 28 -- 7 -- -- 70 MAX 5.10 700 3.5 150 10 50 32 40 10 192 2 -- MIN 11.88 -- -- -- -- -- 16 -- -- -- -- 67 MSR2812D TYP 12 -- -- 75 10 12 28 -- 10 -- -- 70 MAX 12.12 167 4.0 150 20 24 32 40 15 213 15 -- MIN 14.85 -- -- -- -- -- 16 -- -- -- -- 67 MSR2815D TYP 15 -- -- 75 10 12 28 -- 10 -- -- 70 MAX 15.15 133 4.0 150 20 24 32 40 15 213 15 -- % mA UNITS VDC mA W mV p-p mV mV VDC V Notes 1. External capacitors required to prevent damage to internal circuitry (see Table 1 for specifications). 2. Dual output models deliver up to 4 watts total for balanced or unbalanced loads, however, the positive output should carry at least 25% of the total load. SINGLE AND DUAL OUTPUT EXTERNAL CAPACITORS OPERATION WITHOUT EXTERNAL CAPACITORS WILL RESULT IN DAMAGE TO THE INTERNAL CIRCUITRY. TABLE 1: EXTERNAL CAPACITOR REQUIREMENTS Required Connection Positive Output (12 & 13) to Output Common (8 & 9) Positive Output (10) to 2 Dual Outputs Output Common (8) MSR2812D External Capacitor (14) to and Output Common (8)3 MSR2815D Negative Output (12) to Output Common (8) Model Single Output MSR2805S Minimum Capacitor Value1 220 F, 10 V 100 F, 25 V 100 F, 25 V 10 F, 25 V POSITIVE INPUT 1, 2 INHIBIT 15 17, 18 INPUT COMMON FEEDBACK POSITIVE OUTPUT 10 OUTPUT COMMON 8 LOGIC TIMING CONTROL SWITCH VOLTAGE REGULATOR + + EXTERNAL CAPACITORS 100F NEGATIVE OUTPUT 12 14 10F + 100F Notes - Table 1 1. Capacitors should be high quality, low ESR components -- solid tantalum is recommended. 2. See Figure 1 for connection diagram 3. Place positive side of capacitor toward pin 8. EXTERNAL CAPACITOR TERMINAL FIGURE 1: DUAL OUTPUT EXTERNAL CAPACITOR CONNECTIONS B4-28 DC/DC CONVERTERS WARNING: EXTERNAL CAPACITORS REQUIRED TRIPLE OUTPUT MODELS PARAMETER OUTPUT VOLTAGE CONDITIONS 16 TO 32 VIN BALANCED LOAD OUTPUT CURRENT OUTPUT POWER2 OUTPUT RIPPLE3 MAIN AUX MAIN AUX Tc = -55C TO +85C BW DC TO 1 MHz MAIN AUX LINE REGULATION 16 TO 32 VIN NO LOAD TO FULL MAIN AUX MAIN AUX INPUT VOLTAGE Tc = -55C TO +85C TRANSIENT 50 ms NO LOAD INPUT CURRENT FULL LOAD INHIBITED EFFICIENCY MSR28512T MIN 4.9 11.5 10.01 -- -- -- -- -- -- -- -- 16 -- -- -- -- 65 TYP 5.0 12.0 -- -- -- 50 50 5 3 15 15 28 -- 10 -- -- 70 MAX 5.1 12.5 400 50.0 3.2 100 100 10 6 30 30 32 40 20 176 5 -- MIN 4.9 14.5 10.01 -- -- -- -- -- -- -- -- 16 -- -- -- -- 65 MSR28515T TYP 5.0 MAX 5.1 MSR SERIES 4 WATT Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified. UNITS VDC 15.0 15.5 -- -- -- 50 50 5 3 15 15 28 -- 10 -- -- 70 400 40.0 3.2 100 100 10 7.5 30 30 32 40 20 176 5 -- % mA VDC V mV mV W mV p-p mA LOAD REGULATION Notes 1. External capacitors required (see Table 2 for specifications). 2. Minimum load required on main output for full power auxiliary operation. TRIPLE OUTPUT EXTERNAL CAPACITOR OPERATION WITHOUT EXTERNAL CAPACITORS WILL RESULT IN DAMAGE TO THE INTERNAL CIRCUITRY. TABLE 2: EXTERNAL CAPACITOR REQUIREMENTS Required Connection1 Positive 5 VDC Output (9) to Output Common (6 or 7) Minimum Capacitor Value2 220 F, 10 V POSITIVE INPUT 1, 2 INHIBIT 15 INPUT COMMON 17, 18 FEEDBACK +5 OUTPUT 9 REF. & COMP OUTPUT COMMON 6, 7 8 POSITIVE AUXILIARY OUTPUT 5 NEGATIVE AUXILIARY OUTPUT 220F EXTERNAL CAPACITOR Model MSR28512T and MSR28515T LOGIC TIMING CONTROL SWITCH DUAL TRACKING REGULATOR Notes - Table 2 1. See Figure 2 for connection diagram. 2. Capacitors should be high quality, low ESR components -- solid tantalum is recommended. FIGURE 2: TRIPLE OUTPUT EXTERNAL CAPACITOR CONNECTIONS B4-29 MSR SERIES 4 WATT DC/DC CONVERTERS PIN OUT WARNING: EXTERNAL CAPACITORS REQUIRED OPERATION WITHOUT EXTERNAL CAPACITORS WILL RESULT IN DAMAGE TO THE INTERNAL CIRCUITRY. Pin 1, 21 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17, 181 Single Output Positive Input No connection Case No connection No connection No connection Output Common3 Output Common3 No connection No connection Positive Output3 Positive Output3 No connection Inhibit No connection Input Common Dual Output Positive Input No connection Case No connection No Connection No connection Output Common No connection Positive Output No connection Negative Output No connection Ext. Capacitor Inhibit No connection Input Common Triple Output Positive Input No connection Case Negative Aux. Output Output Common Main2 Output Common Aux.2 Positive Aux. Output +5 VDC Output No connection No connection No connection No connection No connection Inhibit No connection Input Common See section B8, case C2, for dimensions. 18 17 10 12 9 Dot on top of cover indicates pin one. BOTTOM VIEW MSR FIGURE 3: PIN OUT Pin Out Notes 1. Make external connection to both pins on all models. Pins 1 and 2 positive input Pins 17 and 18 input common 2. Pins 6 and 7 on triple output models are connected internally. 3. On the HR41-2805: Make external connections to both output common pins (8 and 9). Make external connections to both positive output pins (12 and 13). MODEL NUMBERING KEY Base Model Input Voltage MSR 28 512 T / ES Output Voltage (Main and aux. Vout for triple models) Number of Outputs (S = single, D = dual, T = triple) Screening (Standard screening has no designator in this position.) B4-30 24021-001-DTS Rev A DQ# 1022 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. MSR Series is a trademark of Interpoint. Copyright (c) 1992 - 1999 Interpoint. All rights reserved. CASE C Dot on top of case indicates pin one CASES BOTTOM VIEW CASE C1 MSA Series: Screening - Standard, ES, or 883 SMSA Series: Screening - Space Standard, H, or K Seam Seal Projection Weld 0.932 (23.67) 0.025 (0.64) dia. CASE C BOTTOM VIEW See Figures 9 - 11 for pin configurations. Squared corner and dot on top of case indicate pin one. 1 2 3 4 5 1.075 max (27.31) 1.075 max (27.31) Materials Header Case C1 Cold Rolled Steel/Nickel/Gold Cases C2 and C3 Kovar/Nickel/Tin Cover Case C1 Cold Rolled Steel/Nickel Cases C2 and C3 Kovar/Nickel/Tin Pins Case C1 Copper/Nickel/Gold Cases C2 and C3 Kovar/Nickel/Gold, matched 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 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. 0.205 0.010 (5.21 0.25) 0.270 max. (6.86) 0.000 0.205 0.010 (5.21 0.25) 0.270 max. (6.86) 0.000 0.132 (3.35) 0.000 0.000 8 7 6 0.132 (3.35) 0.332 (8.43) 0.532 (13.51) 0.732 (18.59) FIGURE 9: CASE C1 BOTTOM VIEW CASE C2 MSR Series: Screening - Standard or ES HR40 Series: No screening options 0.018 0.002 dia. (0.46 0.05) Dot on top of case indicates pin one 12 0.800 (20.32 9 18 17 0.932 (23.67) 10 34 65 0.205 0.010 (5.21 0.25) 0.370 max. (9.40) 0.350 (8.89) Marker bead on pin 18 0.100 (2.54) Pins equally spaced 0.800 (20.32) FIGURE 10: CASE C2 FIGURE 8: CASE C MAXIMUM DIMENSIONS Seam Seal BOTTOM VIEW CASE C3 MSF EMI Filter: Screening - Standard or ES 0.018 0.002 dia. (0.46 0.05) 0.000 Dot on top of case indicates pin one 12 0.800 (20.32 98 0.100 (2.54) 7 FIGURE 11: CASE C3 B8-8 0.800 0.600 (20.32) (15.24) 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. 0.205 0.010 (5.21 0.25) 0.205 0.010 (5.21 0.25) 0.370 max. (9.40) 0.350 (8.89) 0.365 max. (9.27) 0.000 0.000 0.300 (7.62) QA SCREENING 85C PRODUCTS 85C PRODUCTS TEST (85C Products excluding HR products) PRE-CAP INSPECTION Method 2017 TEMPERATURE CYCLE (10 times) Method 1010, Cond. B, -55C to 125C CONSTANT ACCELERATION Method 2001, 500 g BURN-IN 96 hours at 70C ambient (typical) FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 and 4: +25C case HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) FINAL VISUAL INSPECTION Method 2009 yes yes no no yes yes yes no yes yes no yes no yes no yes yes yes STANDARD /ES Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. Applies to the following products: MFW Series MTW Series MHE/MLP Series MHL Series MRH Series MTO Series MSR Series DCH Series FM/FMA/FMB EMI Filters MSF EMI Filter C2-12 |
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