TEN 15 Series Power Modules Application Note DC/DC Converter 9 to 18Vdc, 18 to 36Vdc or 36 to 75 Vdc Input 3.3 to 15Vdc Single Outputs and ±5 to ±15Vdc Dual Outputs, 15W Features RoHS compliant Single output up to 2.4A Dual output up to ±800mA Low profile: 2.0 x 1.0 x 0.4 inches (50.8 x 25.4 x 10.2mm) 2：1 wide input voltage 9-18Vdc, 18-36Vdc and 36-75Vdc 15 Watts output power Input to output isolation: 1500Vdc, min Operating case temperature range :100°C max Over-current protection, auto-recovery Output over voltage protection ISO 9001 certified manufacturing facilities UL60950-1 Recognised E188913 CE Mark Within FCC class A radiated limits E188913 Applications Distributed power architectures Communication equipment Computer equipment Complete TEN 15 datasheet can be downloaded at: http://www.tracopower.com/products/ten15.pdf General Description The TEN 15-Modules Power Modules provide 15 watts of isolated, regulated output power, in a standard two by one inches module size, with wide input voltage ranges either 9 – 18Vdc, 18 – 36Vdc or 36 – 75Vdc. It is available with output voltages from 3.3Vdc up to 15Vdc (single output) or ±5Vdc up to ±15Vdc (dual output). The physical design of the unit employs a full five sides metallic case for heat dissipation, and encloses the circuitry in a six-sided shield. Table of contents Absolute maximum rating Output Specifications Input Specifications General Specifications Output over current protection Short circuitry protection Solder, clearing, and drying considerations Characteristic curve Created by Traco Electronic AG Arp. P2 P2 P3 P3 P4 P4 P5 P5 – P15 www.tracopower.com Thermal consideration Test configurations EMC consideration EMI filter Mechanical data Safety and installation instruction MTBF and Reliability th P16 P17 P18 P19 – P20 P21 P22 P22 Date: April 4 , 2011 / Rev.: 2.0 / Page 1 / 22 Application Note 15W, Single and Dual Output Absolute Maximum Rating Parameter Input Voltage Continuous Transient (100ms) Operating temperature range (With Derating curve) Operating case range Storage temperature I/O Isolation voltage (60 seconds) I/O Isolation capacitance Device TEN 15-12xx TEN 15-24xx TEN 15-48xx Standard All All All All Min Typ -40 -55 1500 Max 36 50 100 +85 100 +105 300 Unit Vdc Vdc Vdc °C °C °C Vdc pF Output Specifications Parameter Device TEN 15-xx10 TEN 15-xx11 TEN 15-xx12 TEN 15-xx13 TEN 15-xx21 TEN 15-xx22 TEN 15-xx23 All All All Min 3.26 4.95 11.88 14.85 ±4.95 ±11.88 ±14.85 Temperature Coefficient All -0.02 Transient Response Recovery Time (25%/100% load step change) All Operating Output Range Line Regulation(LL to HL at Full Load) Load Regulation(25% to 100% Full Load) Output Ripple & Noise (20MHz bandwidth) Output Current Output Over Voltage Protection Zener diode clamp Output Over Current Protection Output Capacitor Load Created by Traco Electronic AG Arp. TEN 15-xx10 TEN 15-xx11 TEN 15-xx12 TEN 15-xx13 TEN 15-xx21 TEN 15-xx22 TEN 15-xx23 TEN 15-xx10 TEN 15-xx11 TEN 15-xx12 TEN 15-xx13 TEN 15-xx10 TEN 15-xx11 TEN 15-xx12 TEN 15-xx13 TEN 15-xx21 TEN 15-xx22 TEN 15-xx23 TEN 15-xx10 TEN 15-xx11 TEN 15-xx12 TEN 15-xx13 TEN 15-xx21 TEN 15-xx22 TEN 15-xx23 www.tracopower.com Typ 3.3 5.0 12.0 15.0 ±5.0 ±12.0 ±15.0 Max 3.33 5.05 12.12 15.15 ±5.05 ±12.12 ±15.15 0.5 0.5 50 +0.02 250 400 300 125 100 ±150 ±62 ±50 µS 4000 2500 1250 1000 ±1500 ±625 ±500 3.9 6.2 15 18 6000 4500 1875 1500 ±2250 ±938 ±750 10200 7050 1035 705 ±1020 ±495 ±165 th Unit Vdc Vdc Vdc Vdc Vdc Vdc Vdc % % mV pk-pk %/°C mA mA mA mA mA mA mA Vdc Vdc Vdc Vdc mA mA mA mA mA mA mA μF μF μF μF µF µF µF Date: April 4 , 2011 / Rev.: 2.0 / Page 2 / 22 Application Note 15W, Single and Dual Output Input Specifications Parameter Device TEN 15-12xx TEN 15-24xx TEN 15-48xx Operating Input voltage Input reflected ripple current (please see the testing configurations part.) Start up time (nominal Vin and constant resistive load power up) Remote ON/OFF Positive Logic DC-DC ON DC-DC OFF Min 9 18 36 Typ 12 24 48 Max 18 36 75 Unit Vdc Vdc Vdc All 20 mA pk-pk All 20 mS All All 3.5 0 12 1.2 Vdc Vdc Max Unit % % % % % % % % % % % % % % % % % % % % % General Specifications Parameter Efficiency Test at Vin nom and full load (Please see the testing configurations part.) Isolation resistance Isolation Capacitance Switching Frequency (Test at Vin nom and full load) Weight MTBF (please see the MTBF and reliability part at page 23) Created by Traco Electronic AG Arp. Device TEN 15-1210 TEN 15-1211 TEN 15-1212 TEN 15-1213 TEN 15-1221 TEN 15-1222 TEN 15-1223 TEN 15-2410 TEN 15-2411 TEN 15-2412 TEN 15-2413 TEN 15-2421 TEN 15-2422 TEN 15-2423 TEN 15-4810 TEN 15-4811 TEN 15-4812 TEN 15-4813 TEN 15-4821 TEN 15-4822 TEN 15-4823 All All All All All www.tracopower.com Min Typ 79 82 86 86 83 86 84 80 84 85 85 84 86 86 81 83 87 86 85 88 87 MΩ >10 300 500 27 2’041’000 th pF KHz g hours Date: April 4 , 2011 / Rev.: 2.0 / Page 3 / 22 Application Note 15W, Single and Dual Output Output over current protection When excessive output currents occur in the system, circuit protection is required on all power supplies. Normally, overload current is maintained at approximately 120~140 percent of rated current (@ Vin nom). Hiccup-mode is a method of operation in a power supply whose purpose is to protect the power supply from being damaged during an over-current fault condition. It also enables the power supply to restart when the fault is removed. There are other ways of protecting the power supply when it is over-loaded, such as the maximum current limiting or current foldback methods. One of the problems resulting from over current is that excessive heat may be generated in power devices; especially MOSFET and Schottky diodes and the temperature of those devices may exceed their specified limits. A protection mechanism has to be used to prevent those power devices from being damaged. The operation of hiccup is as follows. When the current sense circuit sees an over-current event, the controller shuts off the power supply for been removed, the power supply will start up and operate normally; otherwise, the controller will see another over-current event and shut off the power supply again, repeating the previous cycle. Hiccup operation has none of the drawbacks of the other two protection methods, although its circuit is circuit is more complicated because it requires a timing circuit. The excess heat due to overload lasts for only a short duration in the hiccup cycle, hence the junction temperature of the power devices is much lower. The hiccup operation can be done in various ways. For example, one can start hiccup operation any time an over-current event is detected; or prohibit hiccup during a designated start-up is usually larger than during normal operation and it is easier for an over-current event is detected; or prohibit hiccup during a designated start-up interval (usually a few milliseconds). The reason for the latter operation is that during start-up, the power supply needs to provide extra current to charge up the output capacitor. Thus the current demand during start-up is usually larger than during normal operation and it is easier for an over-current event to occur. If the power supply starts to hiccup once there is an over-current, it might never start up successfully. Hiccup mode protection will give the best protection for a power supply against over current situations, since it will limit the average current to the load at low level, so reducing power dissipation ad case temperature in the device. Short Circuitry Protection Continuous, hiccup and auto-recovery mode. During short circuit, converter still shut down. The average current during this condition will be very low and the device can be safety in this condition. Solder, clearing, and drying considerations Soldering: Flow(wave) soldering: 250°C ±10°C less than 10 seconds (see below) Soldering iron: 370°C ±10°C less than 5 seconds Note: the pin of this module is coated with Tin. To assure the solder-ability, modules should be kept in their original shipping containers to provide adequate protection. Also, the storage environment shall be well controlled to protect the oxidation. Cleaning process: In aqueous cleaning, it is preferred to have an in-line cleaner system consisting of several cleaning stages (pre-wash, wash, rinse, final rinse, and drying). Deionizer (DI) water is recommend for aqueous cleaning; the minimum resistively level is 1M-cm. Tap-water quality varies per region in terms of hardness, chloride, and solid contents; therefore, the use of tap water is not recommended for aqueous cleaning. Drying: The drying section of the cleaner system should be equipped with blowers capable of generating 1000 cfm-1500 cfm of air so that the amount of rinse water left to be dried off with heat is minimal. Handheld air guns are not recommended due the variability and consistency of the operation. Note: after post-wash, the marking (date code) of converter may fall off. These only impacts the appearance and dose not affect the operation and not affect the operation of the module. Created by Traco Electronic AG Arp. www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 4 / 22 Application Note 15W, Single and Dual Output Output ripple & noise TEN 15-1211 Low Line, Full Load Normal Line, Full Load Output Ripple Noise = 19.6mV pk-pk Output Ripple Noise = 22.8mV pk-pk High Line, Full Load Output Ripple Noise = 29.6mV pk-pk TEN 15-2410 Low Line, Full Load Normal Line, Full Load Output Ripple Noise = 15.2mV pk-pk Output Ripple Noise = 15.6mV pk-pk High Line, Full Load Output Ripple Noise = 20.0mV pk-pk TEN 15-4812 Low Line, Full Load Normal Line, Full Load Output Ripple Noise = 28. 4mV pk-pk Output Ripple Noise = 27.6mV pk-pk Created by Traco Electronic AG Arp. www.tracopower.com High Line, Full Load Output Ripple Noise = 29.6mV pk-pk th Date: April 4 , 2011 / Rev.: 2.0 / Page 5 / 22 Application Note 15W, Single and Dual Output Transient Peak and Response TEN 15-1211 Low Line, Full Load Transient Peak 85.0mV Transient Response 95.2µS Normal Line, Full Load Transient Peak 88.0mV Transient Response 80.8µS High Line, Full Load Transient Peak 89.0mV Transient Response 95.2µS TEN 15-2410 Low Line, Full Load Transient Peak 81.0mV Transient Response130µS Normal Line, Full Load Transient Peak 86.0mV Transient Response 170µS High Line, Full Load Transient Peak 45.6mV Transient Response 200µS TEN 15-4812 Low Line, Full Load Transient Peak 56mV Transient Response130µS Created by Traco Electronic AG Arp. Normal Line, Full Load Transient Peak 66mV Transient Response 150µS www.tracopower.com High Line, Full Load Transient Peak 62mV Transient Response 150µS th Date: April 4 , 2011 / Rev.: 2.0 / Page 6 / 22 Application Note 15W, Single and Dual Output Inrush Current TEN 15-1211 Low Line, Full Load Inrush current = 2930mA Duration: 848µS Normal Line, Full Load Inrush current = 2210mA Duration: 808µS High Line, Full Load Inrush current = 1370mA Duration: 712µS TEN 15-2410 Low Line, Full Load Inrush current = 1460mA Duration: 664µS Normal Line, Full Load Inrush current = 1040mA Duration: 640µS High Line, Full Load Inrush current = 720mA Duration: 600µS TEN 15-4812 Low Line, Full Load Inrush current = 638mA Duration: 1.58mS Created by Traco Electronic AG Arp. Normal Line, Full Load Inrush current = 496mA Duration: 1.44mS www.tracopower.com High Line, Full Load Inrush current = 378mA Duration: 1.22mS th Date: April 4 , 2011 / Rev.: 2.0 / Page 7 / 22 Application Note 15W, Single and Dual Output Input Ripple Current TEN 15-1211 Low Line, Full Load Ripple current = 3.8mA Normal Line, Full Load Ripple current = = 2.9mA High Line, Full Load Ripple current = 3.2mA TEN 15-2410 Low Line, Full Load Ripple current = 6.0mA Normal Line, Full Load Ripple current = 5.1mA High Line, Full Load Ripple current = 4.5mA TEN 15-4812 Low Line, Full Load Ripple current = 5.2mA Created by Traco Electronic AG Arp. Normal Line, Full Load Ripple current = 3.9mA www.tracopower.com High Line, Full Load Ripple current = 4.9mA th Date: April 4 , 2011 / Rev.: 2.0 / Page 8 / 22 Application Note 15W, Single and Dual Output Delay Time and Raise Time TEN 15-1211 Normal Line, Full Load Rise Time = 464.1µS Nominal Line, Full Load Delay Time = 724µS TEN 15-2410 Normal Line, Full Load Rise Time = 425.2µS Normal Line, Full Load Delay Time = 636µS TEN 15-4812 Normal Line, Full Load Rise Time = 1.053mS Created by Traco Electronic AG Arp. Normal Line, Full Load Delay Time = 1.22mS www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 9 / 22 Application Note 15W, Single and Dual Output Output ripple & noise TEN 15-1221 Low Line, Full Load +5V = 55.6mV pk-pk Normal Line, Full Load +5V = 63.6mV pk-pk High Line, Full Load +5V = 71.2mV pk-pk Low Line, Full Load -5V = 29.6mV pk-pk Normal Line, Full Load -5V = 37.2mV pk-pk High Line, Full Load -5V = 42.8mV pk-pk TEN 15-2422 Low Line, Full Load +12V = 28.4mV pk-pk Normal Line, Full Load +12V = 30.0mV pk-pk High Line, Full Load +12V = 29.6mV pk-pk Low Line, Full Load -12V = 10.4mV pk-pk Normal Line, Full Load -12V = 11.6mV pk-pk High Line, Full Load -12V = 13.2mV pk-pk Created by Traco Electronic AG Arp. www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 10 / 22 Application Note 15W, Single and Dual Output Output ripple & noise TEN 15-4823 Low Line, Full Load +15V = 27.2mV pk-pk Normal Line, Full Load +15V = 26.8mV pk-pk High Line, Full Load +15V = 29.6mV pk-pk Low Line, Full Load -15V = 21.6mV pk-pk Normal Line, Full Load -15V = 27.2mV pk-pk High Line, Full Load -15V = 44.4mV pk-pk Created by Traco Electronic AG Arp. www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 11 / 22 Application Note 15W, Single and Dual Output Transient Peak and Response TEN 15-1221 Low Line, Full Load Transient Peak 96.0mV Transient Response 194µS Normal Line, Full Load Transient Peak 103.0mV Transient Response 194µS High Line, Full Load Transient Peak104.0mV Transient Response 194µS TEN 15-2422 Low Line, Full Load Transient Peak 96.0mV Transient Response 180µS Normal Line, Full Load Transient Peak 103.0mV Transient Response180µS High Line, Full Load Transient Peak104.0mV Transient Response 180µS TEN 15-4823 Low Line, Full Load Transient Peak 96.0mV Transient Response 214µS Created by Traco Electronic AG Arp. Normal Line, Full Load Transient Peak 103.0mV Transient Response 214µS www.tracopower.com High Line, Full Load Transient Peak104.0mV Transient Response 214µS th Date: April 4 , 2011 / Rev.: 2.0 / Page 12 / 22 Application Note 15W, Single and Dual Output Inrush Current TEN 15-1221 Low Line, Full Load Inrush current = 2700mA Duration: 928µS Normal Line, Full Load Inrush current = 2000mA Duration: 836µS High Line, Full Load Inrush current = 1470mA Duration: 700µS TEN 15-2422 Low Line, Full Load Inrush current = 1012mA Duration: 1.43mS Normal Line, Full Load Inrush current = 756mA Duration: 1.27mS High Line, Full Load Inrush current = 524mA Duration: 988µS TEN 15-4823 Low Line, Full Load Inrush current = 454mA Duration: 952µS Created by Traco Electronic AG Arp. Line, Full Load Inrush current = 300mA Duration: 800µS www.tracopower.com High Line, Full Load Inrush current = 256mA Duration: 584µS th Date: April 4 , 2011 / Rev.: 2.0 / Page 13 / 22 Application Note 15W, Single and Dual Output Input Ripple Current TEN 15-1221 Low Line, Full Load Ripple current = 4.1mA Normal Line, Full Load Ripple current = 3.8mA High Line, Full Load Ripple current = 4.6mA TEN 15-2422 Low Line, Full Load Ripple current = 2.9mA Normal Line, Full Load Ripple current = 2.6mA High Line, Full Load Ripple current = 3.1mA TEN 15-4823 Low Line, Full Load Ripple current = 2.9mA Created by Traco Electronic AG Arp. Normal Line, Full Load Ripple current = 3.3mA www.tracopower.com High Line, Full Load Ripple current = 4.3mA th Date: April 4 , 2011 / Rev.: 2.0 / Page 14 / 22 Application Note 15W, Single and Dual Output Delay Time and Rise Time TEN 15-1221 Normal Line, Full Load Rise Time = 367.2µS Normal Line, Full Load Delay Time = 688µS TEN 15-2422 Normal Line, Full Load Rise Time = 2.141mS Normal Line, Full Load Delay Time = 2.56mS TEN 15-4823 Normal Line, Full Load Rise Time = 5.182mS Created by Traco Electronic AG Arp. Normal Line, Full Load Delay Time = 5.52mS www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 15 / 22 Application Note 15W, Single and Dual Output Thermal Consideration The power module operates in a variety of thermal environments; however, sufficient cooling should be provided to help ensure reliable operation of the unit. Heat is removed by conduction, convention, and radiation to the surrounding environment. Proper cooling can be verified by measuring the case temperature (Tc) should be measured at the position indicated in right figure The temperature at this location should not exceed 100°C. When operating the power module, adequate cooling must be provided to maintain the power module case temperature at or below 100°C. Although the maximum case temperature to lower value for extremely high reliability. Optimum cooling is obtained with forced convention. Following are derating curve for TEN 15-1211, TEN 15-2410, TEN 15-4812 1.00(25.4) TEN 15-1211 100 90 0.50(12.7) Output Power [%] 80 70 60 50 40 30 nature convection nature convection with heat-sink 20 10 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 Ambient Temperature [°C] Created by Traco Electronic AG Arp. www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 16 / 22 Application Note 15W, Single and Dual Output Testing Configurations Input reflected-ripple current Measurement Test up To Oscilloscope Current Probe ● 12µH ● Vi (+) ● 100µF/100V Battery DC/DC Converter ● Vi (-) Peak-to-peak output ripple & noise Measurement Test up Output Voltage and Efficiency Measurement Test up Note: All measurements are taken at the module terminals. Vout × Iout max η= × 100% Vin nom × Iin Created by Traco Electronic AG Arp. www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 17 / 22 Application Note 15W, Single and Dual Output EMC Consideration EN61000-4-2 ESD EN61000-4-3 RS EN61000-4-4 EFT level 1 2 3 4 Contact discharge test voltage(KV) ±2 ±4 ±6 ±8 level 1 2 3 level 1 2 3 4 Air discharge test voltage(KV) ±2 ±4 ±8 ±15 level 1 2 3 4 test field strength (V/m) 1 3 10 open circuit output test voltage ±10% power line ±0.5KV ±1.0KV ±2.0KV ±4.0KV EN61000-4-5 Surge level 1 2 3 4 open circuit output test voltage ±10% ±0.5KV ±1.0KV ±2.0KV ±4.0KV EN61000-4-6 CS level 1 2 3 voltage level (EMF) 1V/rms 3V/rms 10V/rms Created by Traco Electronic AG Arp. www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 18 / 22 Application Note 15W, Single and Dual Output EMI Filter 1. L1 = L2: Common choke P/N.9L-TF016, as attachment 1. 2. L3 = L4: Common choke Common choke P/N.9L-TF017, as attachment 2. 1. L1 = L2: Common choke P/N.9L-TF016 as attachment 1. 2. L3 = L4: Common choke Common choke P/N.9L-TF017 as attachment 2. 3. C1 = C2: (1)To lie down NIPPON CHEMI-CON KMF series 100μF/50V aluminum electrolytic capacitors 8mm x 11.5mm(ΦD x L) or equivalent for 12 & 24Vin. (2) To lie down NIPPON CHEMI-CON KMF series 22μF/100V aluminum electrolytic capacitors 8mm x 11.5mm(ΦD x L) or equivalent for 48Vin. 4. C3=C4: 1000pF/2KV DIP or SMD MLCC. attachment 1 9L-TF016 Material: Core: 9 x 5 x 3 Wire: 2-UEW Φ 0.5mm Specifications: inductance pin 1-2: 300µH±35％ DCR: 32m Max. Test condition: 100KHz/20mV Measurement instrument: HP 4263B LCR Meter Created by Traco Electronic AG Arp. www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 19 / 22 Application Note 15W, Single and Dual Output attachment 2 9L-TF017 Material: Core: 13 x 8 x 6 Wire: 2-UEW Φ 0.5mm Specifications: inductance pin 1-2: 900µH Min. pin 3-4: 300µH Min. DCR: 45m Max. Test condition: 100KHz/100mV Measurement instrument: HP 4263B LCR Meter Created by Traco Electronic AG Arp. www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 20 / 22 Application Note 15W, Single and Dual Output Mechanical Data Dimensions are in millimeters and(inches) Tolerances: x .xx in. ±0.020 in. (x.x mm ±0.5mm) x .xx in. ±0.015 in. (x.x mm ±0.5mm) Pin Pitch Tolerance: ±0.014 (±0.35) Side View DIA. 0.04(1.0) Top View ● Ctrl ● -Vin ● +Vin 0.80(20.3) -Vout ● +Vout ● TEN 15-xxxx 0.40 (10.2) 0.22(5.6) Bottom View 1.00(25.4) 0.50 (12.7) 0.40 (10.2) 0.40 (10.2) PIN CONNECTION 5 Bottom View 1 2 6 0.80(20.3) 4 0.60(15.2) 2.00(50.8) 3 PIN Single Output Dual Output 1 2 3 4 5 6 + INPUT - INPUT + OUTPUT NO PIN - OUTPUT CTRL (Option) + INPUT - INPUT + OUTPUT COMMON - OUTPUT CTRL (Option) 0.10(2.5) 0.20(5.1) Created by Traco Electronic AG Arp. www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 21 / 22 Application Note 15W, Single and Dual Output Safety and Installation Instruction Isolation consideration The TEN 15 series features 1.5kVdc isolation from input to output, input to case, and output to case. The input to output resistance is greater than 109 ohms. Nevertheless, if the system using the power module needs to receive safety agency approval, certain rules must be followed in the design of the system using the model. In particular, all of the creepage and clearance requirements of the end-use safety requirement must be observed. These documents include UL 60950-1, EN 60950-1 and CSA 22.2 60950-1-2, although specific applications may have other or additional requirements. Fusing Consideration Caution: This power module is not internally fused. An input line fuse must always be used. This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone operation to an integrated part of a sophisticated power architecture. To maximum flexibility, internal fusing is not included; however, to achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a slow-blow fuse with maximum rating of 6.3 A. Based on the information provided in this data sheet on inrush energy and maximum dc input current, the same type of fuse with lower rating can be used. Refer to the fuse manufacturer’s data for further information. Minimum Load Requirement 10% (of full load) minimum load required. The 10% minimum load requirement is in order to meet all performance specifications. The TEN 15 Series does not properly maintain regulation and operate with no load condition. The output voltage drops off about 10%. MTBF and Reliability The MTBF of TEN 15 series of DC/DC converters has been calculated using 1. MIL-HDBK-217F under the following conditions: Nominal Input Voltage Iout = Iout max TA = 25°C The resulting figure for MTBF is 1’044’000 hours. 2. Bellcore TR-NWT-000332 Case I: 50% stress, Operating Temperature at 40°C (Ground fixed and controlled environment) The resulting figure for MTBF is 2’041’000 hours. Created by Traco Electronic AG Arp. www.tracopower.com th Date: April 4 , 2011 / Rev.: 2.0 / Page 22 / 22