MCOTS-C-270-28-FT Single Output Full-brick MILITARY COTS DC/DC CONVERTER 155-425V Continuous Input 155-475V Transient Input 28V Output 21.4A Output 92% @ 10.7A /91% @ 21.4A Efficiency Operation: -55C to +100C The MilQor series of Mil-COTS DC-DC converters brings SynQor's field proven high-efficiency synchronous rectification technology to the Military/Aerospace industry. SynQor's ruggedized encased packaging approach ensures survivability in demanding environments. Compatible with the industry standard format, these converters operate at a fixed frequency, and follow conservative component derating guidelines. They are designed and manufactured to comply with a wide range of military standards. .4 A 21 @ T U M O D C 27 C/D OT 0 C S (1 C 55 ON C-4 V 2 25 ER 70 V TE ) R 2 IN 828 F V T- N -M -F Mil-COTS Safety Features * 4250V dc, 100 M input-to-output isolation * (see Standards and Qualifications page) Designed and Manufactured in the USA Operational Features Mechanical Features * Industry standard full-brick pin-out configuration * Size: 4.686" x 2.476" x .512" 119.0 x 62.9 x 13.0 mm * Total weight: 9.9oz (280g) * Flanged baseplate version available Protection Features Control Features * * * * * * * * * * * Fully Isolated On/Off control Remote sense for the output voltage Output voltage trim range of +10%, -20% Active current sharing (full feature option) Clock synchronization (full feature option) Start synchronization (full feature option) MCOTS series converters (with an MCOTS filter) are designed to meet: * MIL-HDBK-704 (A-F) * RTCA/DO-160E Section 16 * MIL-STD-1275 (B,D) * DEF-STAN 61-5 (Part 6)/(5 or 6) * MIL-STD-461 (C, D, E) * RTCA/DO-160E Section 22 Phone 1-888-567-9596 Input under-voltage lockout/over-voltage shutdown Output current limit and short circuit protection Input over-voltage protection Output over-voltage protection Thermal shutdown Screening/Qualification Specification Compliance Product # MCOTS-C-270-28-FT * High efficiency, 91% at full rated load current * Operating input voltage range: 155-425 V * Fixed frequency switching provides predictable EMI * * * * * AS9100 and ISO 9001:2008 certified facility Qualification consistent with MIL-STD-883 Available with S-Grade or M-Grade screening Pre-cap inspection per IPC-610, Class III Temperature cycling per MIL-STD-883, Method 1010, Condition B, 10 cycles * Burn-In at 100C baseplate temperature * Final visual inspection per MIL-STD-2008 * Full component traceability www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 1 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification BLOCK DIAGRAM REGULATION STAGE ISOLATION STAGE CURR ENT SENSE 5 POSITIVE INPUT 16-18 POSITIVE OUTPUT T1 T1 6 T2 T2 NEGATIVE INPUT ISOLATION BARRIER 13-15 GATE DR IVERS UVLO OVSD 3 ON/OFF + CURR ENT LIMIT GATE CONTROL 7 VAUX 10 OPTO-ISOLATION PRIMARY CONTROL 4 NEGATIVE OUTPUT TRIM SECOND ARY CONTROL ON /OFF - 11 + SENSE 12 1 - SENSE SyncIn (Full Feature Option) 8 DATA COUPLING 2 Start Sync (Full Feature Option) SyncOut (Full Feature Option) 9 I Share (Full Feature Option) TYPICAL CONNECTION DIAGRAM Vin(+) Vin External Input Filter Electrolytic Capacitor Vout(+) Vsense(+) ON/OFF Trim Vsense(_) Vin(_) Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 www.synqor.com Rtrim-up or Rtrim-down Cload Iload Vout(_) Doc.# 005-0005931 Rev. F 10/16/2013 Page 2 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification MCOTS-C-270-28-FT ELECTRICAL CHARACTERISTICS Tb = 25 C, Vin = 270dc unless otherwise noted; full operating temperature range is -55 C to +100 C baseplate temperature with appropriate power derating. Specifications subject to change without notice. Parameter Min. ABSOLUTE MAXIMUM RATINGS Input Voltage Non-Operating Operating Operating Transient Protection Isolation Voltage Input to Output Input to Base-Plate Output to Base-Plate Operating Temperature Storage Temperature Voltage at ON/OFF input pin INPUT CHARACTERISTICS Operating Input Voltage Range Input Under-Voltage Turn-On Threshold Input Under-Voltage Turn-Off Threshold Input Over-Voltage Turn-Off Threshold Input Over-Voltage Turn-On Threshold Recommended External Input Capacitance Input Filter Component Values (L\C) Maximum Input Current No-Load Input Current Disabled Input Current Response to Input Transient Input Terminal Ripple Current Recommended Input Fuse OUTPUT CHARACTERISTICS Output Voltage Set Point Output Voltage Regulation Over Line Over Load Over Temperature Total Output Voltage Range Output Voltage Ripple and Noise Peak-to-Peak RMS Operating Output Current Range Operating Output Current Range (Start Up) Output DC Current-Limit Inception Output DC Current-Limit Shutdown Voltage Back-Drive Current Limit while Enabled Back-Drive Current Limit while Disabled Maximum Output Capacitance Output Voltage during Load Current Transient Step Change in Output Current (0.1 A/s) Settling Time Output Voltage Trim Range Output Voltage Remote Sense Range Output Over-Voltage Protection Auxiliary power Typ. Max. Units Notes & Conditions 600 425 475 V V V Continuous Continuous 1 s transient, square wave 4250 2300 2300 +100 +135 18 V dc V dc V dc C C V 425 154 145 503 460 10 V V V V V F F\H\F A mA mA V mA A 28.00 28.28 V 0.1 0.1 0.3 0.3 220 28.7 % % mV V 440 320 21.4 21.4 28.8 3,000 mV mV A A A V mA mA F 10 10 38.5 10 mV s % % V V -0.5 -55 -65 -2 155 146 135 496 446 270 150 140 500 453 7 .272/5.5/1.2 35 10 1 450 27.72 -220 27.3 220 157 0 0.22 22.6 25.7 14 400 4 5.6 70 20 500 900 -20 31.5 7 35 8 Baseplate temperature 475V transient for 1 s typical ESR 1 see Note 2 Internal values; see Figure E Vin min; trim up; in current limit See Figure 12 RMS , Full load Fast acting external fuse recommended Over sample, line, load, temperature & life 20 MHz bandwidth; see Note 1 Full load Full load Subject to thermal derating See Application Notes Output voltage 10% Low Negative current drawn from output Negative current drawn from output Vout nominal at full load (resistive load) 50% to 75% to 50% Iout max To within 1% Vout nom Across Pins 13&18; Figure C; see Note 3 Across Pins 13&18 Over full temp range Maximum current of 50mA, Referenced to Vout(-) Note 1: Output is terminated with 1 F ceramic and 15 F low-ESR tantalum capacitors. For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: mqnbofae@synqor.com) Note 2: An input capacitor with series resistance is necessary to provide system stability. Note 3: Trim-up range is limited below 10% at low line and full load.Applying more than 6.2V between trim pin and Vout(-) may damage the unit. Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 3 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification MCOTS-C-270-28-FT ELECTRICAL CHARACTERISTICS Tb = 25 C, Vin = 270dc unless otherwise noted; full operating temperature range is -55 C to +100 C baseplate temperature with appropriate power derating. Specifications subject to change without notice. Parameter Min. DYNAMIC CHARACTERISTICS Turn-On Transient Turn-On Time Start-Up Inhibit Time 360 Output Voltage Overshoot ISOLATION CHARACTERISTICS Isolation Voltage (dielectric strength) Isolation Resistance Isolation Capacitance (input to output) TEMPERATURE LIMITS FOR POWER DERATING CURVES Semiconductor Junction Temperature Board Temperature Transformer Temperature Maximum Baseplate Temperature, Tb FEATURE CHARACTERISTICS Switching Frequency 350 ON/OFF Control Off-State Voltage 2.4 On-State Voltage -1 ON/OFF Control Input Resistance Over-Temperature Shutdown OTP Trip Point Over-Temperature Shutdown Restart Hysteresis EFFICIENCY 100% Load 50% Load FULL FEATURE OPTION Clock Sync 350 Current Share RELIABILITY CHARACTERISTICS Calculated MTBF per MIL-HDBK-217F Calculated MTBF per MIL-HDBK-217F Typ. Max. Units 90 400 0 440 ms ms % 4250 100 N/A 375 V dc M pF 125 125 125 100 C C C C 400 kHz 18 0.8 V Notes & Conditions Full load, Vout=90% nom. See Figure F Maximum Output Capacitance See Absolute Maximum Ratings See Note 5 Package rated to 150 C UL rated max operating temp 130 C Application notes Figures A & B 3 125 10 k C C 91 92 % % 375 2.2 400 1.2 0.120 kHz V 106 Hrs. 106 Hrs. Average PCB Temperature See Note 6 Full load Ground Benign, 70C Tb Ground Mobile, 70C Tb Note 5: Input to output isolation capacitance external to the module is recommended. Note 6: Do not apply a clock signal lower than specified frequency. STANDARDS COMPLIANCE Parameter Notes & Conditions STANDARDS COMPLIANCE UL 60950-1/R2011-12 Reinforced Insulation CAN/CSA C22.2 No. 60950-1/A1:2011 EN 60950-1/A12:2011 CE Marked 2006/95/EC Low Voltage Directive IEC 61000-4-2 ESD test, 8 kV - NP, 15 kV air - NP (Normal Performance) Note: An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new releases or download from the SynQor website. Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 4 MCOTS-C-270-28-FT Output: 28V Current: 21.4A 94 94 92 92 90 90 Efficiency (%) Efficiency (%) Technical Specification 88 86 88 86 84 84 425 Vin 82 155 Vin 10 Load Current (A) 15 20 25C 100C Case Temperature (C) Figure 1: Efficiency at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at 25C. Figure 2: Efficiency at nominal output voltage and 60% rated power vs. case temperature for minimum, nominal, and maximum input voltage. 50 60 40 Power Dissipation (W) 50 Power Dissipation (W) 425 Vin 80 -55C 80 5 270 Vin 82 270 Vin 0 155 Vin 40 30 20 30 20 155 Vin 10 425 Vin 10 270 Vin 270 Vin 425 Vin 155 Vin 0 -55C 0 0 5 10 Load Current (A) 15 20 Figure 3: Power dissipation at nominal output voltage vs. load current for minimum, nominal, and maximum input voltage at T =25C. CASE 100C Figure 4: Power dissipation at nominal output voltage and 60% rated power vs. case temperature for minimum, nominal, and maximum input voltage. 25 30.0 20 25.0 20.0 Output Voltage (V) Iout (A) 25C Case Temperature (C) 15 15.0 10 10.0 155 Vin 5 270Vin 5.0 425 Vin 0 50 60 70 80 90 100 110 120 0.0 0 Base Plate Temperature (C) Figure 5: Maximum output current vs. base plate temperature (nominal input voltage). Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 5 10 15 Load Current (A) 20 25 30 Figure 6: Output voltage vs. load current showing typical current limit curves. See Current Limit section in the Application Notes. www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 5 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification Figure 7: Start waveform with 1% load. Input voltage pre-applied, ON/OFF Pin on Ch 1. Figure 8: Turn-on transient at full resistive load and zero output capacitance initiated by Vin. ON/OFF Pin previously low. Ch 1: Vin (100V/div). Ch 2: Vout (10V/div). Figure 9: Input terminal current ripple, iC, at full rated output current and nominal input voltage (500 mA/div). Bandwidth: 25MHz. See Figure 17. Figure 10: Output voltage ripple, Vout, at nominal input voltage and rated load current (200 mV/div). Load capacitance: 1F ceramic capacitor and 10F tantalum capacitor. Bandwidth: 25 MHz. See Figure 17. Figure 11: Output voltage response to step-change in load current (50%-75%50% of Iout(max); dI/dt = 0.1 A/s). Load cap: 1 F ceramic and 15 F tantalum capacitors. Ch 3: Vout (500mV/div), Ch 2: Iout (10A/div). Figure 12: Output voltage response to step-change in input voltage (1000V/ms). Load cap: 100 F electrolytic output capacitance. Ch 1: Vin (200V/div), Ch 2: Vout (1V/div). Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 6 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification 0 1 Forward Transmission (dB) Output Impedance (ohms) -10 0.1 0.01 270Vin 425Vin 155Vin 0.001 10 100 1,000 10,000 -20 -30 -40 -50 -60 -70 -80 270Vin -90 155Vin -100 100,000 10 Hz 100 1,000 10,000 100,000 Hz Figure 13: Magnitude of incremental output impedance (Zout = vout/iout) for minimum, nominal, and maximum input voltage at full rated power. Figure 14: Magnitude of incremental forward transmission (FT = vout/vin) for minimum, nominal, and maximum input voltage at full rated power. 1000 Input Impedance (Ohms) -5 Reverse Transmission (dB) 425Vin -15 -25 -35 270Vin -45 100 10 270Vin 425Vin 425Vin 155Vin 155Vin 1 -55 10 100 1,000 10,000 Hz 10 100,000 1,000 10,000 100,000 Hz Figure 15: Magnitude of incremental reverse transmission (RT = iin/iout) for minimum, nominal, and maximum input voltage at full rated power. Figure 16: Magnitude of incremental input impedance (Zin = vin/iin) for minimum, nominal, and maximum input voltage at full rated power. 1 F ceramic capacitor 4.5 H source impedance i VSOURCE 100 C 7 F,ceramic capacitor in sereis with 1 Resistor DC/DC Converter VOUT 10 F, 100m ESR tantalum capacitor Figure 17: Test set-up diagram showing measurement points for Input Terminal Ripple Current (Figure 9) and Output Voltage Ripple (Figure 10). Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 Figure 18: Load current (10A/div) as a function of time (5ms/div and 100ms/div) when the converter attempts to turn on into a 10 m short circuit. www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 7 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification CONTROL FEATURES BASIC OPERATION AND FEATURES This Mil-COTS converter series uses a two-stage power conversion topology. The first stage is a buck-converter that keeps the output voltage constant over variations in line, load, and temperature. The second stage uses a transformer to provide the functions of input/output isolation and voltage step-up or step-down to achieve the output voltage required. Both the first stage and the second stage switch at a fixed frequency for predictable EMI performance.The switching frequency of second stage is half of the swithcing frequency of first stage and locked in phase. Rectification of the transformer's output is accomplished with synchronous rectifiers. These devices, which are MOSFETs with a very low on-state resistance, dissipate far less energy than Schottky diodes. This is the primary reason that the converter has such high efficiency, even at very low output voltages and very high output currents. These converters are offered totally encased to withstand harsh environments and thermally demanding applications. Dissipation throughout the converter is so low that it does not require a heatsink for operation in many applications; however, adding a heatsink provides improved thermal derating performance in extreme situations. This series of converters uses the industry standard footprint and pin-out configuration. On when switch is open 5V VIN (+) +ON/OFF -ON/OFF 5V Pins 11 and 12 must be connected for proper regulation of the output voltage. If these connections are not made, the converter will deliver an output voltage that is slightly higher than its set value. The voltage at the output terminals of the module will be trimmed up by the control circuit to compensate for voltage drops between the output pins of the module and the remote sense point. Note that the over-voltage protection (OVP) circuit senses the voltage at the output pins of the module. It is possible to inadvertently trip the OVP protection circuit if the voltage drop between the output pins and the sense point becomes too large. Hence, the remote sensing feature should be used only to compensate for small values of voltage drops to avoid triggering OVP due to a line or load transient. VOUT (+) SENSE (+) Opto U1 SENSE (-) 3.01k V OUT (-) VIN (-) On when switch is closed ON/OFF(+) and ON/OFF(-) (Pin 3 and 4) - Remote ON/OFF: The ON/OFF inputs, Pins 3 and 4, permit the user to turn the converter on or off. These two inputs are fully isolated from both the input and the output side of the power converter, allowing the user the option to manage the converter from the input or the output end. The user's on/off control signal is applied between the ON/OFF(+) pin and the ON/OFF(-) pins. Figure A details two possible circuits for driving the ON/OFF pin. Figure B is a detailed look of the internal ON/OFF circuitry. REMOTE SENSE(+) and SENSE(-) (Pins 11 and 12): The SENSE inputs correct for voltage drops along the conductors that connect the converter's output pins to the load.Pin 11 should be connected to Vout(+) and Pin 12 should be connected to Vout(-) at the point on the board where regulation is desired. A remote connection at the load can adjust for a voltage drop only as large as that specified in this datasheet, that is [Vout(+) - Vout(-)] - [Vsense(+) - Vsense(-)] Sense Range % x Vout Pin 3 R1 C1 D1 100p VIN (+) +ON/OFF VOUT (+) SENSE (+) -ON/OFF SENSE (-) Pin 4 Figure B: Internal ON/OFF pin circuitry V OUT (-) VIN (-) Figure A: Example of two configurations for the enable signal Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 8 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification To decrease the output voltage, the user should connect a resistor between Pin 10 (TRIM) and Pin 12 [SENSE(-)]. For a desired decrease of the nominal output voltage, the value of the resistor should be: Rtrim-down = ( 90.9 % 100,000 Trim Resistance (k) OUTPUT VOLTAGE TRIM (Pin 10): The TRIM input permits the user to adjust the output voltage across the sense leads up or down according to the trim range specifications. 10,000 1,000 ) - 0.909 (k) 100 10 where 1 0 % = | Vnominal - Vdesired Vnominal ( 1.0VOUT x (100+%) 1.225% - | x 100% 90.9 % - 0.909 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 % Increase in Vout % Decrease in Vout Figure C: Trim graph for trim-up, trim down. To increase the output voltage, the user should connect a resistor between Pin 10 (TRIM) and Pin 11 [SENSE(+)]. For a desired increase of the nominal output voltage, the value of the resistor should be: Rtrim-up = 1 ) (k) where Vout = Nominal Output Voltage It is not necessary for the user to add capacitance at the Trim pin. The node is internally bypassed to eliminate noise. Total DC Variation of VOUT: For the converter to meet its full specifications, the maximum variation of the dc value of VOUT, due to both trimming and remote load voltage drops, should not be greater than that specified for the output voltage trim range.Note if the unit is started at no load the output voltage may, under some conditions, regulate above its rated value. This condition will be corrected once the load is increased above 1%, and it will stay corrected even if the load is lowered to zero. The trim graphs show the relationship between the trim resistor value and the percentage decrease or increase of the output voltage relative to thenominal output voltage set point. The graphs also show the total range the output voltage can be trimmed up or down. Note: the TRIM feature does not affect the voltage at which the output over-voltage protection circuit is triggered. Trimming the output voltage too high may cause the overvoltage protection circuit to engage, particularly during transients. Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 9 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification Protection Features Input Under-Voltage Lockout: The converter is designed to turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the application note titled "Input System Instability" available on www.SynQor.com . The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical Turn-On Voltage Threshold value (listed on the specification page) before the converter will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Output Over-Voltage Limit: If the voltage across the output pins exceeds the Output Over-Voltage Protection threshold, the converter will immediately stop switching. This prevents damage to the load circuit due to 1) excessive series resistance in output current path from converter output pins to sense point, 2) a release of a short-circuit condition, or 3) a release of a current limit condition. Load capacitance determines exactly how high the output voltage will rise in response to these conditions. After 400 ms the converter will automatically restart. Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 Over-Temperature Shutdown: A temperature sensor on the converter senses the average temperature of the module. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the Over-Temperature Shutdown value. It will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the Over-Temperature Shutdown Restart Hysteresis value. Output Current Limit: The output current remains constant as the output voltage drops. However, once the impedance of the load across the output is small enough to make the output voltage drop below the specified Output DC Current-Limit Shutdown Voltage, the converter turns off. The converter then enters a "auto-restart" mode where it repeatedly turns on and off at a 2.5 Hz (nominal) frequency until the overload condition is removed. This prevents excessive heating of the converter or the load board. www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 10 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification APPLICATION CONSIDERATIONS Input System Instability: This condition can occur because any dc-dc converter appears incrementally as a negative resistance load. A detailed application note titled "Input System Instability" is available on the SynQor website which provides an understanding of why this instability arises, and shows the preferred solution for correcting it. Application Circuits: Figure D provides a typical circuit diagram which details the input filtering and voltage trimming. Electrolytic Capacitor Vin Vout(+) Vin(+) Vsense(+) ON/OFF (+) External Input Filter Trim ON/OFF (-) Rtrim-up or Rtrim-down Vsense(_) Vin(_) Cload Iload Vout(_) Figure D: Typical application circuit (negative logic unit, permanently enabled). Input Filtering and External Capacitance: Figure E provides a diagram showing the internal input filter components. This filter dramatically reduces input terminal ripple current, which otherwise could exceed the rating of the converter's external electrolytic input capacitor. The recommended external input capacitance is specified in the Input Characteristics section on the Electrical Characteristics page. More detailed information is available in the application note titled "EMI Characteristics" on the SynQor website. L Vin(+) C2 C1 Vin(_) Figure E: Internal Input Filter Diagram (Component values listed on page 3) Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 11 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification Startup Inhibit Period: The Startup Inhibit Period ensures that the converter will remain off for approximately 400 ms when it is shut down for any reason. For example, when an output short is present the module will shutdown, remain off for the startup inhibit period, and then attempt to restart. This results in a 2.5Hz auto restart mode of operation which prevents the converter from overheating. In all, there are seven ways that the converter can be shut down, initiating a Startup Inhibit Period: * Input Under-Voltage Lockout * Input Over-Voltage Lockout * Output Over-Voltage Protection * Over Temperature Shutdown * Current Limit * Short Circuit Protection * Turned off by the ON/OFF input Figure F shows three turn-on scenarios, where a Startup Inhibit Period is initiated at t0, t1, and t2: Before time t0, when the input voltage is below the UVL threshold, the unit is disabled by the Input Under-Voltage Lockout feature. When the input voltage rises above the UVL threshold, the Input Under-Voltage lockout is released, and a Startup Inhibit Period is initiated. At the end of this delay, the ON/OFF pin is evaluated, and since it is active, the unit turns on. When the ON/OFF pin goes high after t2, the Startup Inhibit Period has elapsed, and the output turns on within the typical Turn-On Time. Thermal Considerations: The maximum operating baseplate temperature, TB, is 100 C. Refer to the thermal derating curve figure to see the available output current at baseplate temperatures below 100 C. A power derating curve can be calculated for any heatsink that is attached to the base-plate of the converter. It is only necessary to determine the thermal resistance, RTHBA, of the chosen heatsink between the base-plate and the ambient air for a given airflow rate. This information is usually available from the heatsink vendor. The following formula can then be used to determine the maximum power the converter can dissipate for a given thermal condition: max Pdiss TB - TA RTHBA = This value of power dissipation can then be used in conjunction with the data shown in Figure 3 to determine the maximum load current (and power) that the converter can deliver in the given thermal condition. At time t1, the unit is disabled by the ON/OFF pin, and it cannot be enabled again until the Startup Inhibit Period has elapsed. Vin Under-Voltage Lockout Turn-On Threshold ON/OFF (Negative logic) ON OFF OFF ON ON 90ms (typical turn on time) Vout 140ms 400ms (typical start-up) t0 400ms (typical start-up inhibit period after shutdown) t1 t t2 Figure F: Startup Inhibit Period (turn-on time not to scale) Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 12 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification Mechanical Diagram OVERALL HEIGHT +.002 0.512 -.005 +0.05 13.00 -0.12 M3 STANDOFF x4 SEE NOTE 9 2.486 .020 [ 63.14 0.5] 2.00 [ 50.8 ] [ 1.800 [ 45.72 ] 1.450 [ 36.83 ] 1.200 [ 30.48 ] ] .950 [ 24.13 ] .550 [ 13.97 ] .300 [ 7.62 ] .151 .010 [ 3.97 ] SEE NOTE 5 .050 [ 1.27 ] 13 14 15 12 11 10 9 8 7 3.900 [ 99.06 ] 4.20 [ 106.7 ] 16 17 18 3.750 [ 95.25 ] 3.600 [ 91.44 ] 3.450 [ 87.63 ] 4.686 .020 [ 119.02 0.5] 4.200 [ 106.68 ] 3.300 [ 83.82 ] 3.150 [ 80.01 ] .243 .020 [ 6.17 0.5] 6 1 .250 .020 [ 6.35 0.5] [ .493 .020 [ 12.52 0.5] 5 4 3 2 1 BOTTOMSIDE CLEARANCE +0.007 0.017 -0.010 +0.17 0.43 -0.25 .150 [ 3.81 ] ] .300 [ 7.62 ] .450 [ 11.43 ] .850 [ 21.59 ] 1.250 [ 31.75 ] NOTES PIN DESIGNATIONS 1) Pins 1-4, 7-12 are 0.040" (1.02mm) diameter, with 0.080" (2.03mm) diameter standoff shoulders. 2) Pins 5-6, 13-18 are 0.080" (2.03 mm) diameter with 0.125" (3.18mm) diameter standoff shoulders. 3) All Pins: Material - Copper Alloy; Finish - Matte Tin over Nickel plate 4) Undimensioned components are shown for visual reference only. 5) Applied torque per screw should not exceed 6in-lb (0.7Nm). 6) Baseplate flatness tolerance is 0.004" (.10mm) TIR for surface. 7) Weight: 9.9oz (280g) typical 8) Workmanship: Meets or exceeds IPC-A-610 Class II 9) Threaded or non-threaded options available. 10) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 Pin Name Function 1 SyncIn Synchronization Input (full feature only) 2 SyncOut Synchronization Output (full feature only) 3 ON/OFF(+) Turn converter on and off, referenced to - ON/OFF 4 ON/OFF(-) Fully isolated ground 5 Vin(+) Positive input voltage 6 Vin(-) Negative input voltage 7 Vaux Auxiliary power, referenced to Vout(-) 8 Start Sync Startup synchronization (full feature only) 9 I Share Single wire parallel signal (full feature only) 10 TRIM Output voltage trim (see note 1) 11 SENSE(+) Positive remote sense (see note 2) 12 SENSE(-) Negative remote sense (see note 3) 13 Vout(-) Negative output voltage 14 Vout(-) Negative output voltage 15 Vout(-) Negative output voltage 16 Vout(+) Positive output voltage 17 Vout(+) Positive output voltage 18 Vout(+) Positive output voltage Pin Designations Notes: 1 Leave TRIM pin open for nominal output voltage. 2 SENSE(+) should be connected to Vout(+) remotely or at converter. 3 SENSE(-) should be connected to Vout(-) remotely or at converter. 4 Pins 1, 2, 8, and 9 are populated on full feature versions only. www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 13 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification Flanged Mechanical Diagram 1.450[36,830] 1.200[30,480] OVERALL HEIGHT 0.4950.015 [ 12,570,38 ] 3.1500.020 [ 80,0100,508 ] 2.9500.020 [ 74,9300,508 ] 0.950[24,130] 0.550[13,970] 0.300[7,620] 0.168 [4,27] 2.4860.020 [ 63,1440,508 ] USE 4-40 OR M3 SCREW (6x) RECOM TORQUE 3in-lb .13[3.3] 0.050[1,270] 13 14 15 17 16 18 12 11 10 4.686 0.020 [ 119,020,50 ] 9 8 7 4.17 [105,8] 3.900 [99,060] 3.750 [95,250] 3.00 [76,2] 3.600 [91,440] 4.200 [106,680] 3.450 [87,630] 3.300 [83,820] 1.50 [38,1] 0.6000.020 [ 15,240,50 ] 3.150 [80,010] 6 1 5 4 3 2 1 0.0170.020 [ 0,430,50 ] 0.2430.020 [ 6,170,50 ] 0.4930.020 [ 12,520,50 ] 0.125 [3,18] 0.150[3,810] 0.7250.020 [ 18,420,50 ] 0.300[7,620] 0.8250.020 [ 20,960,50 ] 0.450[11,430] 0.850[21,590] 1.250[31,750] NOTES PIN DESIGNATIONS 1) Applied torque per screw should not exceed 5in-lb (0.7Nm), 3in-lb (0.4Nm) recommended. 2) Pins 1-4, 7-12 are 0.040" (1.02mm) diameter, with 0.080" (2.03mm) diameter standoff shoulders. 3) Pins 5-6, 13-18 are 0.080" (2.03 mm) diameter with 0.125" (3.18mm) 4) All Pins: Material - Copper Alloy; Finish - Matte Tin over Nickel plate 5) Undimensioned components are shown for visual reference only. 6) Baseplate flatness tolerance is 0.010" (.25mm) TIR for surface. 7) Weight: 10.1oz (285g) typical 8) Workmanship: Meets or exceeds IPC-A-610 Class II 9) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm) Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 Pin Name Function 1 SyncIn Synchronization Input (full feature only) 2 SyncOut Synchronization Output (full feature only) 3 ON/OFF(+) Turn converter on and off, referenced to - ON/OFF 4 ON/OFF(-) Fully isolated ground 5 Vin(+) Positive input voltage 6 Vin(-) Negative input voltage 7 Vaux Auxiliary power, referenced to Vout(-) 8 Start Sync Startup synchronization (full feature only) 9 I Share Single wire parallel signal (full feature only) 10 TRIM Output voltage trim (see note 1) 11 SENSE(+) Positive remote sense (see note 2) 12 SENSE(-) Negative remote sense (see note 3) 13 Vout(-) Negative output voltage 14 Vout(-) Negative output voltage 15 Vout(-) Negative output voltage 16 Vout(+) Positive output voltage 17 Vout(+) Positive output voltage 18 Vout(+) Positive output voltage Pin Designations Notes: 1 Leave TRIM pin open for nominal output voltage. 2 SENSE(+) should be connected to Vout(+) remotely or at converter. 3 SENSE(-) should be connected to Vout(-) remotely or at converter. 4 Pins 1, 2, 8, and 9 are populated on full feature versions only. www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 14 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification Mil-COTS Qualification Test Name # Tested (# Failed) Visual, mechanical and electrical testing before, during and 15 after 1000 hour burn-in @ full load (0) Visual, mechanical and electrical testing before, during and 5 after shock and vibration tests (0) 8 +85C, 95% RH, 1000 hours, 2 minutes on / 6 hours off (0) 500 cycles of -55C to +100C 10 (30 minute dwell at each temperature) (0) 15 15 pins (0) -65C to +110C across full line and load specifications in 7 5C steps (0) 2 70,000 feet (21 km), see Note (0) Details Life Testing Shock-Vibration Humidity Temperature Cycling Solderability DMT Altitude Consistent with MILSTD-883F Method Consistent with MILSTD-883F Method 5005 Method 1005.8 MIL-STD-202, Methods 201A & 213B Method 1004.7 Method 1010.8 Condition A Method 2003 Note: A conductive cooling design is generally needed for high altitude applications because of naturally poor convective cooling at rare atmospheres. Mil-COTS DC-DC Converter and Filter Screening Screening Process Description S-Grade M-Grade Baseplate Operating Temperature -55C to +100C -55C to +100C Storage Temperature -65C to +135C -65C to +135C Pre-Cap Inspection IPC-610, Class III Temperature Cycling Method 1010, Condition B, 10 Cycles Burn-In 100C Baseplate 12 Hours 96 Hours 100% 25C -55C, +25C, +100C MIL-STD-2008 Final Electrical Test Final Visual Inspection MILCOTS MIL-STD-810G Qualification Testing MIL-STD-810G Test Fungus Method 508.6 Description Table 508.6-I 500.5 - Procedure I Storage: 70,000ft. / 2 Hr. duration 500.5 - Procedure II Operating; 70,000ft. / 2 Hr. duration; Ambient Temperature Rapid Decompression 500.5 - Procedure III Storage: 8,000ft. to 40,000ft. Acceleration 513.6 - Procedure II Operating - 15g's Salt Fog 509.5 Storage 501.5 - Procedure I Storage: 135C / 3 hrs 501.5 - Procedure II Operating: 100C / 3 hrs 502.5 - Procedure I Storage: -65C / 4 hrs 502.5 - Procedure II Operating: -55C / 3 hrs Temperature Shock 503.5 - Procedure I - C Storage: -65C to 135C; 12 cycles Rain 506.5 - Procedure I Wind Blown Rain Immersion 512.5 - Procedure I Non-Operating Humidity 507.5 - Procedure II Aggravated cycle @ 95% RH (Figure 507.5-7 aggravated temp - humidity cycle, 15 cycles) Random Vibration 514.6 - Procedure I 10-2000 Hz, PSD level of 1.5 g2/Hz(54.6grms), duration = 1 hr/axis 516.6 - Procedure I 20g's peak, 11ms, Functional Shock (Operating no load) (saw tooth) 516.6 - Procedure VI 514.6 - Category 14 510.5 - Procedure I Bench Handling Shock Rotary wing aircraft - helicopter, 4hrs/axis, 20g's (sine sweep from 10 - 500HZ) Blowing Dust 510.5 - Procedure II Blowing Sand Altitude High Temperature Low Temperature Shock Sinusoidal vibration Sand and Dust Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 15 MCOTS-C-270-28-FT Output: 28V Current: 21.4A Technical Specification Ordering Information/ Part Numbering Example MCOTS-C-270-28-FT-N-S Not all combinations make valid part numbers, please contact SynQor for availability. See product summary page for details. Family MCOTS Product Input Voltage C: Converter 270: 155-425V Output Voltage Heatsink Option Package N:Normal Threaded 05:5V 12:12V 15:15V 24:24V 28:28V 48:48V FT:Full Brick Tera F:Flanged D:Normal NonThreaded Screening Level Options [ ]:Standard Feature S: S-Grade M: M-Grade F:Full Feature APPLICATION NOTES PATENTS A variety of application notes and technical white papers can be downloaded in pdf format from our website. SynQor holds the following U.S. patents, one or more of which apply to each product listed in this document. Additional patent applications may be pending or filed in the future. Contact SynQor for further information and to order: Phone: Toll Free: Fax: E-mail: Web: Address: 978-849-0600 888-567-9596 978-849-0602 mqnbofae@synqor.com www.synqor.com 155 Swanson Road Boxborough, MA 01719 USA Product # MCOTS-C-270-28-FT Phone 1-888-567-9596 5,999,417 6,222,742 6,545,890 6,577,109 6,594,159 6,731,520 6,894,468 6,896,526 6,927,987 7,050,309 7,072,190 7,085,146 7,119,524 7,269,034 7,272,021 7,272,023 7,558,083 7,564,702 7,765,687 7,787,261 8,023,290 8,149,597 8,493,751 Warranty SynQor offers a two (2) year limited warranty. Complete warranty information is listed on our website or is available upon request from SynQor. Information furnished by SynQor is believed to be accurate and reliable. However, no responsibility is assumed by SynQor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SynQor. www.synqor.com Doc.# 005-0005931 Rev. F 10/16/2013 Page 16