FEATURES • • • • • • • • • • • –55°C to +85°C 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 MSR SERIES 4 WATT DC/DC CONVERTERS 28 VOLT INPUT 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 Series™ 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. 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. 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. 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. 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 85°C, with the output power derated linearly to zero at 115°C. 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 DC/DC CONVERTERS TYPICAL CHARACTERISTICS INHIBIT 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) • 300°C Storage Temperature Range (Case) • –-65°C to +150°C 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 Inhibit TTL Open Collector • Logic low (output disabled) ≤ 0.8 V • Referenced to input common • Logic high (output enabled) ≥ 12 V Open collector RECOMMENDED OPERATING CONDITIONS Input Voltage Range • 16 to 32 VDC continuous • 40 V for 50 msec transient Case Operating Temperature (Tc) • –55°C to +85°C full power • –55°C to +115°C absolute Derating Output Power/Current • Linearly from 100% at 85°C to 0% at 115°C WARNING: EXTERNAL CAPACITORS REQUIRED Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. SINGLE AND DUAL OUTPUT MODELS PARAMETER1 MSR2805S CONDITIONS MSR2812D MSR2815D MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS 4.90 5.0 5.10 ±11.88 ±12 ±12.12 ±14.85 ±15 ±15.15 VDC 16 TO 32 VIN — — 700 — — ±167 — — ±133 mA OUTPUT POWER Tc = –55°C TO +85°C — — 3.5 — — 4.0 — — 4.0 W OUTPUT RIPPLE BW = DC TO 1 MHz — 75 150 — 75 150 — 75 150 mV p-p LINE REGULATION 16 TO 32 VIN — 5 10 — 10 20 — 10 20 mV LOAD REGULATION NO LOAD TO FULL — 25 50 — 12 24 — 12 24 mV Tc = –55°C TO +85°C 16 28 32 16 28 32 16 28 32 VDC TRANSIENT 50 ms — — 40 — — 40 — — 40 V NO LOAD — 7 10 — 10 15 — 10 15 OUTPUT VOLTAGE OUTPUT CURRENT INPUT VOLTAGE INPUT CURRENT FULL LOAD — — 192 — — 213 — — 213 INHIBITED — — 2 — — 15 — — 15 65 70 — 67 70 — 67 70 — EFFICIENCY Notes 1. External capacitors required to prevent damage to internal circuitry (see Table 1 for specifications). mA % 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 Dual Outputs2 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 µF, 10 V 100 µF, 25 V INHIBIT 15 100 µF, 25 V 17, 18 10 µF, 25 V 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. B4-28 FEEDBACK POSITIVE INPUT 1, 2 INPUT COMMON POSITIVE OUTPUT 10 LOGIC OUTPUT COMMON 8 TIMING CONTROL SWITCH + + VOLTAGE REGULATOR NEGATIVE OUTPUT 12 EXTERNAL CAPACITORS 100µF 10µF + 100µF 14 EXTERNAL CAPACITOR TERMINAL FIGURE 1: DUAL OUTPUT EXTERNAL CAPACITOR CONNECTIONS MSR SERIES 4 WATT DC/DC CONVERTERS WARNING: EXTERNAL CAPACITORS REQUIRED Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. TRIPLE OUTPUT MODELS PARAMETER MSR28512T CONDITIONS LINE REGULATION LOAD REGULATION INPUT VOLTAGE MAX MIN TYP MAX 5.0 5.1 MAIN 4.9 5.0 5.1 4.9 BALANCED LOAD AUX ±11.5 ±12.0 ±12.5 ±14.5 MAIN 10.01 — 400 10.01 — 400 AUX — — ±50.0 — — ±40.0 OUTPUT CURRENT OUTPUT RIPPLE3 TYP 16 TO 32 VIN OUTPUT VOLTAGE OUTPUT POWER2 MSR28515T MIN Tc = –55°C TO +85°C UNITS VDC ±15.0 ±15.5 mA — — 3.2 — — 3.2 — 50 100 — 50 100 ± AUX — 50 100 — 50 100 MAIN — 5 10 — 5 10 ± AUX — 3 6 — 3 7.5 MAIN — 15 30 — 15 30 ± AUX — 15 30 — 15 30 Tc = –55°C TO +85°C 16 28 32 16 28 32 VDC TRANSIENT 50 ms — — 40 — — 40 V NO LOAD — 10 20 — 10 20 MAIN BW DC TO 1 MHz 16 TO 32 VIN NO LOAD TO FULL INPUT CURRENT FULL LOAD — — 176 — — 176 INHIBITED — — 5 — — 5 65 70 — 65 70 — EFFICIENCY W mV p-p mV mV mA % 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 Model MSR28512T and MSR28515T Required Connection1 Positive 5 VDC Output (9) to Output Common (6 or 7) Minimum Capacitor Value2 220 µF, 10 V Notes – Table 2 1. See Figure 2 for connection diagram. 2. Capacitors should be high quality, low ESR components — solid tantalum is recommended. FEEDBACK POSITIVE INPUT 1, 2 INHIBIT 15 INPUT COMMON 17, 18 +5 OUTPUT 9 LOGIC TIMING CONTROL SWITCH REF. & COMP DUAL TRACKING REGULATOR OUTPUT COMMON 6, 7 8 POSITIVE AUXILIARY OUTPUT 220µF EXTERNAL CAPACITOR 5 NEGATIVE AUXILIARY OUTPUT FIGURE 2: TRIPLE OUTPUT EXTERNAL CAPACITOR CONNECTIONS B4-29 MSR SERIES 4 WATT DC/DC CONVERTERS WARNING: EXTERNAL CAPACITORS REQUIRED OPERATION WITHOUT EXTERNAL CAPACITORS WILL RESULT IN DAMAGE TO THE INTERNAL CIRCUITRY. PIN OUT Pin Single Output Dual Output 1, 21 Positive Input Positive Input Positive Input Triple Output 3 No connection No connection No connection 4 Case Case Case 5 No connection No connection Negative Aux. Output 6 No connection No Connection Output Common Main2 7 No connection No connection Output Common Aux.2 8 Output Common3 Output Common Positive Aux. Output 9 Output Common3 No connection +5 VDC Output 10 No connection Positive Output No connection 11 No connection No connection No connection 12 Positive Output3 Negative Output No connection 13 Positive Output3 No connection No connection 14 No connection Ext. Capacitor No connection 15 Inhibit Inhibit Inhibit 16 No connection No connection No connection 17, 181 Input Common Input Common Input Common Dot on top of cover indicates pin one. FIGURE 3: PIN OUT 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 10 See section B8, case C2, for dimensions. MODEL NUMBERING KEY MSR 9 BOTTOM VIEW MSR 18 17 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). Base Model Input Voltage 1 2 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 © 1992 - 1999 Interpoint. All rights reserved. CASES CASE C BOTTOM VIEW CASE C1 MSA Series: Screening – Standard, ES, or 883 SMSA Series: Screening – Space Standard, H, or K Dot on top of case indicates pin one Projection Weld Seam Seal 0.932 (23.67) 1.075 max (27.31) FIGURE 8: CASE C MAXIMUM DIMENSIONS 2 3 4 5 0.932 (23.67) 6 0.732 (18.59) 0.332 (8.43) 0.000 0.000 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) FIGURE 9: CASE C1 7 0.532 (13.51) 8 0.132 (3.35) 0.000 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 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 2 9 18 17 10 0.205 ±0.010 (5.21 ±0.25) FIGURE 10: CASE C2 0.000 0.800 (20.32 0.370 max. (9.40) 0.350 (8.89) 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. 1 0.025 (0.64) dia. 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 Squared corner and dot on top of case indicate pin one. 0.132 (3.35) CASE C BOTTOM VIEW See Figures 9 - 11 for pin configurations. 0.100 (2.54) Pins equally spaced Marker bead on pin 18 0.800 (20.32) BOTTOM VIEW CASE C3 MSF EMI Filter: Screening – Standard or ES Seam Seal 0.018 ±0.002 dia. (0.46 ±0.05) Dot on top of case indicates pin one 1 2 3 4 0.800 (20.32 B8-8 0.300 (7.62) 0.100 (2.54) 0.000 0.205 ±0.010 (5.21 ±0.25) 0.370 max. (9.40) 0.350 (8.89) 0.000 7 0.800 0.600 (20.32) (15.24) FIGURE 11: CASE C3 0.205 ±0.010 (5.21 ±0.25) 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. 0.365 max. (9.27) 9 8 6 5 QA SCREENING 85°C PRODUCTS 85°C PRODUCTS TEST (85°C Products excluding HR products) STANDARD /ES yes yes no yes no yes no yes yes yes Fine Leak, Method 1014, Cond. A no yes Gross Leak, Method 1014, Cond. C no yes Gross Leak, Dip (1 x 10-3) yes no yes yes PRE-CAP INSPECTION Method 2017 TEMPERATURE CYCLE (10 times) Method 1010, Cond. B, -55°C to 125°C CONSTANT ACCELERATION Method 2001, 500 g BURN-IN 96 hours at 70°C ambient (typical) FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 and 4: +25°C case HERMETICITY TESTING FINAL VISUAL INSPECTION Method 2009 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