FEATURES • • • • • • • • • • DC/DC CONVERTERS 28 VOLT INPUT –55° to +125°C operation 16 to 40 VDC input Fully isolated Optocoupler feedback Fixed frequency, 550 kHz typical (400 kHz typ. 60 V output model) Topology – Flyback 50 V for up to 50 ms transient protection Inhibit function Indefinite short circuit protection Up to 76% efficiency, 16 W/in3 Size (max.): Weight: Screening: MSA SERIES 5 WATT MODELS VDC OUTPUT SINGLE 5 5.2 12 15 60 DUAL ±5 ±12 ±15 1.075 x 1.075 x 0.270 inches (27.31 x 27.31 x 6.86 mm) 15 grams maximum. Standard, ES, or 883 (Class H). DESCRIPTION The MSA Series™ of high frequency DC/DC converters offers a new standard of performance for low power, military/aerospace grade DC/DC converters. MSA parts provide up to 5 watts output power over the full military temperature range 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 MSA Series parts is 16 watts per cubic inch. The MSA Series’ small size, low height, and hermetically sealed metal enclosures make them ideal for use in military, aerospace and other high reliability applications. Units are available with standard, screening, “ES”, and fully compliant SMD “883” screening. See page 8 for screening options and descriptions. CONVERTER DESIGN The MSA 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 path 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. Up to 4 watts, 80% of the total output power, is available from either output, provided that the opposite output is simultaneously carrying 20% of the total power. Each output must carry a minimum of 20% of the total output power in order to maintain specified regulation on the negative output. 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. WIDE VOLTAGE RANGE The MSA converters are designed to provide full power operation over a full 16 to 40 VDC voltage range. Operation below 16 volts, including MIL-STD-704E emergency power conditions is possible with derated power. Please refer to the low line dropout graphs (Figures 17 and 18) for details. A low voltage lockout feature keeps the converter shutdown below approximately 13 VDC to ensure smooth initialization. IMPROVED DYNAMIC RESPONSE The MSA 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%. INHIBIT FUNCTION MSA 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 (≤0.8 V) 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 V. In the inhibit mode, a maximum of 4 mA must be sunk from the inhibit pin. UNDERVOLTAGE LOCKOUT AND TRANSIENT PROTECTION Undervoltage lockout helps keep system current levels low during initialization or re-start operations. They can withstand short term transients of up to 50 volts without damage. 1 DC/DC CONVERTERS MSA SERIES 5 WATT ABSOLUTE MAXIMUM RATINGS TYPICAL CHARACTERISTICS INHIBIT 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 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 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 (400 kHz 60 V model) 450 kHz min, 600 kHz max 350 kHz min, 450 kHz max 60 V model 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) • –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, unless otherwise specified. SINGLE OUTPUT MODELS PARAMETER CONDITIONS OUTPUT VOLTAGE Tc = –55°C TO +125°C OUTPUT CURRENT Tc = –55°C TO +125°C VIN = 16 TO 40 VDC OUTPUT POWER OUTPUT RIPPLE VOLTAGE LINE REGULATION LOAD REGULATION INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT Tc = –55°C TO +125°C INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT3, 4 SHORT CIRCUIT STEP LOAD RESPONSE4, 5 STEP LINE RESPONSE4, 5 MSA2805S MSA285R2S MSA2812S MSA2815S MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX 4.95 5.00 5.05 5.15 5.20 5.25 11.88 12.00 12.12 14.85 15.00 15.15 MSA2860S1 MIN TYP MAX 59.1 60.00 60.9 UNITS VDC 0 — 1000 0 — 962 0 — 417 0 — 333 0 — 20 mA Tc = –55°C TO +125°C — — 5 — — 5 — — 5 — — 5 — — 1.2 W 10 kHz - 2 MHz VIN = 16 TO 40 VDC Tc = –55°C TO +125°C NO LOAD TO FULL Tc = –55°C TO +125°C Tc = –55°C TO +125°C CONTINUOUS TRANSIENT 50 ms NO LOAD FULL LOAD INHIBITED 10 kHz - 10 MHz Tc = –55°C TO +125°C — 125 350 — 110 335 — 50 200 — 50 170 — — 300 mV p-p — 10 502 — 10 50 — 10 50 — 10 50 — — 300 mV — 10 50 — 10 50 — 10 50 — 10 50 — — 300 mV 16 0 — — — — — 66 — — 28 — 27 250 3 25 30 71 1.5 12.5 40 50 40 — 5 100 150 — 2.0 25 16 0 — — — — — 66 — — 28 — 28 250 3 25 30 71 1.5 1.5 40 50 40 — 5 100 150 — 2.0 25 16 0 — — — — — 70 — — 28 — 29 235 3 25 30 76 1.2 1 40 50 42 — 5 100 150 — 1.9 10 16 0 — — — — — 71 — — 28 — 31 235 3 25 30 76 1.2 1 40 50 44 — 5 100 150 — 1.8 10 16 0 — — — — — 70 — — 28 — — 72 3 — — 75 — — 40 50 30 — 5 90 — — — — VDC V — — 100 100 250 250 — — 100 100 250 250 — — 150 200 375 500 — — 200 200 500 500 — — — — — — — 50 150 — 50 150 — 80 200 — 50 125 — — — — 50 150 — 50 150 — 100 250 — 50 125 — — — 16 TO 40 VIN — 100 250 — 100 250 — 250 625 — 250 625 — — — 40 TO 16 VIN DELAY OVERSHOOT — 200 500 — 200 500 — 250 625 — 250 625 — — — — — 10 0 25 50 — — 10 0 25 50 — — 3 0 10 120 — — 3 0 10 150 — — — — — — VIN = 16 TO 40 VDC POWER DISSIPATION RECOVERY 50% - 100% - 50% TRANSIENT RECOVERY TRANSIENT 16 TO 40 VIN 40 TO 16 VIN mA mA p-p % W ms mV pk µs mV pk RECOVERY START-UP Notes 1. MSA2860S specifications are at 25°Tc only, contact your Interpoint representative for more information on over temperature specs. 2. Line regulation for /ES and non /ES 2805S models at 16 to 17 VIN and 110 °C to 125°C (case) is 5% (max). 2 µs ms mV pk 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 VOUT is within 1% of VOUT at final value. 5. Transition time >10µs. MSA SERIES 5 WATT DC/DC CONVERTERS Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. DUAL OUTPUT MODELS PARAMETER OUTPUT VOLTAGE MSA 2805D CONDITIONS MSA2812D MSA2815D MIN TYP MAX MIN TYP MAX MIN TYP MAX +VOUT 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 –VOUT 4.9 5.0 5.1 11.76 12.00 12.24 14.70 15.00 15.30 — ±500 800 — ±208 333 — ±167 267 UNITS VDC OUTPUT CURRENT1 VIN = 16 to 40 VDC Tc = –55°C to +125°C OUTPUT POWER1 VIN = 16 to 40 VDC Tc = –55°C to +125°C — — 5 — — 5 — — 5 W 10 kHz - 2 MHz — — 150 — 40 140 — 60 150 mV p-p Tc = –55°C to +125°C +VOUT — 10 25 — 10 50 — 10 50 — 40 75 — 40 180 — 40 180 — 10 50 — 10 50 — 10 50 — 50 200 — 50 200 — 50 200 — 10 20 — 8 15 — 7 15 — 5 8 — 3.7 6 — 3 6 NO LOAD TO FULL ˜CONTINUOUS 16 28 40 16 28 40 16 28 40 VDC TRANSIENT 50 msec NO LOAD — — — 30 50 35 — — — 33 50 58 — — — 38 50 60 V FULL LOAD INHIBITED 10 kHz TO 10 MHz Tc = –55°C to +125°C — — — — 68 248 3 25 30 72 — 5 80 160 — — — — — 69 235 3 25 30 75 — 5 100 150 — — — — — 70 235 3 25 30 75 — 5 100 150 — mA — — 1.3 — 1.8 50 — — 1.3 1 1.7 10 — — 1.3 1 1.6 10 W ms OUTPUT RIPPLE VOLT. LINE REGULATION Vin = 16 to 40 VDC –VOUT LOAD REGULATION NO LOAD TO FULL Tc = –55°C to +125°C +VOUT –VOUT CROSS REGULATION2 +PO = 20 - 80 %, –PO = 80 - 20% –PO = 20 - 80 %, +PO = 80 - 20% +PO = 50 - 10 %, –PO = 50% –PO = 50 - 10 %, +PO = 50% INPUT VOLTAGE Tc = –55°C to +125° INPUT CURRENT Tc = –55°C to +125°C INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT3, 4 STEP LOAD RESPONSE4, 5 STEP LINE RESP.4, 5 START-UP POWER DISSIPATION SHORT CIRCUIT RECOVERY 50% - 100% - 50% BALANCED mA mV mV % mA p-p % TRANSIENT — — ±150 — ±300 ±750 — ±300 ±750 mV RECOVERY — — 100 — 200 500 — 500 1250 µs — — — — — — — — — — — — ±750 ±500 1200 1200 25 500 — — — — — — ±50 ±50 150 400 3 0 ±125 ±125 375 1000 10 120 — — — — — — ±150 ±100 250 800 3 0 ±375 ±250 625 2000 10 150 16 TO 40 TRANSIENT 40 TO 16 16 TO 40 RECOVERY 40 TO 16 DELAY OVERSHOOT VDC VDC VDC VDC 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. See Figures 15 and 16. mV pk µs ms mV pk 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 VOUT is within 1% of VOUT at final value. 5. Transition time >10µs. 3 DC/DC CONVERTERS MSA SERIES 5 WATT 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 and dot on top of package indicate pin one. 1 2 3 4 5 BOTTOM VIEW MSA 8 7 6 See page 7 for dimensions. FIGURE 1: PIN OUT BOTTOM VIEW SMD NUMBERS MODEL NUMBERING KEY MSA 28 12 D / 883 Base Model Input Voltage Output Voltage (R = decimal point, 5R2 = 5.2 Vout) Number of Outputs (S = single, D = dual) Screening (Standard screening has no designator in this position.) 4 STANDARD MICROCIRCUIT DRAWING (SMD) MSA SERIES SIMILAR PART 5962-9309201HXC IN PROCESS 5962-9309301HXC 5962-9309401HXC 5962-0052201HXC 5962-9308901HXC 5962-9309001HXC MSA2805S/883 MSA285R2S/883 MSA2812S/883 MSA2815S/883 MSA2860S/883 MSA2812D/883 MSA2815D/883 For exact specifications for an SMD product, refer to the SMD drawing. Call your Interpoint representative for status on MSA SMD releases. “883” suffix indicates SMD similar part. SMDs can be downloaded from: http://www.dscc.dla.mil/programs/smcr DC/DC CONVERTERS MSA SERIES 5 WATT Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. 80 28V 50 40 60 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 70 70 40V 30 16V 16V 70 60 80 80 16V 28V 40V 50 1 2 3 4 5 30 6 OUTPUT POWER (Watts) 28V 40V 50 40 40 MSA2805S EFFICIENCY 60 30 1 2 3 4 5 6 1 2 3 4 5 6 OUTPUT POWER (Watts) OUTPUT POWER (Watts) MSA2812S EFFICIENCY MSA2815S EFFICIENCY FIGURE 2 FIGURE 4 FIGURE 3 80 10 60 40V 28V 50 40 20 40 50 60 70 80 90 1 2 3 4 5 6 100 0.1 1 10 100 VOUT OUTPUT POWER (Watts) FREQUENCY (kHz) 100µs/div 16V TO 40V MSA2815D EFFICIENCY MSA SERIES AUDIO REJECTION MSA2805S STEP LINE RESPONSE FIGURE 7 FIGURE 6 FIGURE 5 20V/div. 30 VIN 30 20mV/div. ATTENUATION (dB) EFFICIENCY (%) 20V/div. 16V 70 100% to 10% VIN 10% to 100% 100µs/div 10% 100% MSA2805S STEP LOAD RESPONSE FIGURE 8 FIGURE 9 50% to 10% VOUT 1 ms / div 100µs/div 50% 100% MSA2805S STEP LOAD RESPONSE MSA2805S TURN-ON INTO NO LOAD FIGURE 10 –POUT=2.5W –POUT=0.5W VIN 90% to 10% +VOUT 200mV/div. 100mV/div. 100mV/div. 20V/div. 50% to 100% 1V/div. 50mV/div. 50mV/div. 100% to 50% –VOUT 10% to 90% 10% to 50% 200µs/div 16V TO 40V 100µs/div 10% 50%) 200µs/div 10% 90% MSA2815D INPUT STEP LINE RESPONSE MSA2815D +VO STEP LOAD RESPONSE MSA2815D +VO STEP LOAD RESPONSE FIGURE 11 FIGURE 12 FIGURE 13 5 DC/DC CONVERTERS MSA SERIES 5 WATT VIN 5V/div. +VOUT –VOUT 10 5 8 4 –VOUT VOLTAGE CHANGE (%) –VOUT VOLTAGE CHANGE (%) 20V/div. Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. 6 4 2812D 2 0 2815D –2 –4 –6 –8 –10 500µs/div 90/10 70/30 50/50 30/70 10/90 MSA DUAL CROSS REGULATION FIGURE 14 16 INPUT VOLTAGE (Volts) INPUT VOLTAGE (Volts) 17 MSA2805S 15 MSA2812S 14 13 MSA2815D 16 15 14 13 MSA2812D MSA2815S 12 1 2 3 4 6 1 2 3 4 5 6 OUTPUT POWER (Watts) 50 mV DROP OUTPUT POWER (Watts) 50 mV DROP LOW LINE DROPOUT VS. LOAD LOW LINE DROPOUT VS. LOAD FIGURE 17 6 5 12 COND A 1 0 FIGURE 18 2815D –1 COND B –2 –3 2812D –4 10 20 30 40 50 OUTPUT LOAD (%) COND. A: 50% LOAD +V; 10% to 50% –V COND. B: 50% LOAD –V; 10% to 50% +V MSA DUAL CROSS REGULATION FIGURE 16 FIGURE 15 17 2 –5 OUTPUT LOAD (+VOUT % / –VOUT %) 90–10% LOAD on +V, 10-90% LOAD on –V MSA2815D TURN-ON INTO NO LOAD 2812D 3 MSA SERIES 5 WATT DC/DC CONVERTERS Dot on top of case indicates pin one CASE C BOTTOM VIEW See Figure 20 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 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 300°C for 10 seconds per pin. FIGURE 19: CASE C MAXIMUM DIMENSIONS BOTTOM VIEW CASE C1 MSA Series: Screening – Standard, ES, or 883 Seam Seal Projection Weld Squared corner and dot on top of case indicate pin one. 0.932 (23.67) 1 2 3 4 5 0.025 (0.64) dia. 0.932 (23.67) 6 0.732 (18.59) 0.532 (13.51) 7 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) 0.132 (3.35) 8 0.132 (3.35) 0.000 FIGURE 20: 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. 7 DC/DC CONVERTERS MSA SERIES 5 WATT ENVIRONMENTAL SCREENING TEST (125°C Products) STANDARD /ES /883 (Class H)* PRE-CAP INSPECTION Method 2017, 2032 yes yes yes TEMPERATURE CYCLE (10 times) Method 1010, Cond. C, -65°C to 150°C Method 1010, Cond. B, -55°C to 125°C no no no yes yes no CONSTANT ACCELERATION Method 2001, 3000 g Method 2001, 500 g no no no yes yes no BURN-IN Method 1015, 160 hours at 125°C 96 hours at 125°C case (typical) no no no yes yes no FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 through 6: -55°C, +25°C, +125°C Subgroups 1 and 4: +25°C case no yes no yes yes no HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) no no yes yes yes no yes yes no FINAL VISUAL INSPECTION Method 2009 yes yes yes Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. *883 products are built with element evaluated components and are 100% tested and guaranteed over the full military temperature range of –55°C to +125°C. Contact Information: www.interpoint.com Interpoint Headquarters USA Phone: 1-800-822-8782 +425-882-3100 Email: [email protected] Interpoint UK Phone: +44-1252-815511 Email: [email protected] 8 22021-001-DTS Rev C 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. MSA Series is a trademark of Interpoint. Copyright © 1994 - 2001 Interpoint Corporation. All rights reserved. Interpoint France Phone: +33-134285455 Email: [email protected]