ADDC02815DATV

ADDC02812DA AD | Alldatasheet

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REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices 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 Analog Devices. a 28 V/100 W DC/DC Converters with Integral EMI Filter ADDC02812DA/ADDC02815DA FUNCTIONAL BLOCK DIAGRAM OUTPUT FILTER VCOM VCOM +SENSE ADJUST STATUS VAUX INHIBIT SYNC ISHARE TEMP –VIN +VIN FIXED FREQUENCY DUAL INTERLEAVED POWER TRAIN –SENSE –VOUT –VOUT +VOUT +VOUT INPUT SIDE CONTROL CIRCUIT EMI FILTER OUTPUT SIDE CONTROL CIRCUIT ADDC02812DA/ADDC02815DA

FEATURES

28 V dc Input, 612 V dc @ 8.34 A, 100 W Output (ADDC02812DA) 28 V dc Input, 615 V dc @ 6.68 A, 100 W Output (ADDC02815DA) Integral EMI Filter Designed to Meet MIL-STD-461D Low Weight: 80 Grams NAVMAT Derated Many Protection and System Features

APPLICATIONS

Commercial and Military Airborne Electronics Missile Electronics Space-Based Antennae and Vehicles Mobile/Portable Ground Equipment GENERAL DESCRIPTION The ADDC02812DA and ADDC02815DA hybrid military dc/ dc converters with integral EMI filter offer the highest power density of any dc/dc power converters with their features and in their power range available today. The converters with integral EMI filter are a fixed frequency, 1 MHz, square wave switching dc/dc power supply. They are not variable frequency resonant converters. In addition to many protection features, these con- verters have system level features that allow them to be used as a component in larger systems as well as a stand-alone power supply. The units are designed for high reliability and high performance applications where saving space and/or weight are critical. The ADDC02812DA and ADDC02815DA are available in a hermetically sealed, molybdenum based hybrid package and are easily heatsink mountable. Three screening levels are available, including military SMD. PRODUCT HIGHLIGHTS 1. 60 W/cubic inch power density with an integral EMI filter designed to meet all applicable requirements in MIL-STD- 461D when installed in a typical system setup 2. Light weight: 80 grams 3. Operational and survivable over a wide range of input conditions: 16 V–50 V dc; survives low line, high line, and positive and negative transients 4. High reliability; NAVMAT derated 5. Protection features include: Output Overvoltage Protection Output Short Circuit Current Protection Thermal Monitor/Shutdown Input Overvoltage Shutdown Input Transient Protection 6. System level features include: Current Sharing for Parallel Operation Inhibit Control Output Status Signal Synchronization for Multiple Units Input Referenced Auxiliary Voltage Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1997

Case Test ADDC02812DA ADDC02815DA Parameter Temp Level Conditions Min Typ Max Min Typ Max Units INPUT CHARACTERISTICS Steady State Operating Input Voltage Range 1 (12 V) Full VI I O = ± 0.42 A to ± 4.17 A 18 28 40 V dc Steady State Operating Input Voltage Range1 (15 V) Full VI I O = ± 0.34 A to ± 3.34 A 18 28 40 V dc Abnormal Operating Input Voltage Range (per MIL-STD-704D) 1 (12 V) Full VI I O = ± 0.42 A to ± 3.34 A 16 50 V dc Abnormal Operating Input Voltage Range (per MIL-STD-704D) 1 (15 V) Full VI I O = ± 0.34 A to ± 2.67 A 16 50 V dc Input Voltage Shutdown (12 V/15 V) +25 °C I 50 52 55 50 52 55 V dc No Load Input Current (12 V/15 V) +25 °C I 85 100 85 100 mA Disabled Input Current (12 V/15 V) Full VI 1 2 1 2 mA OUTPUT CHARACTERISTICS 2, 3, 4 VIN = 18 to 40 V dc Full VI I O = ± 0.42 A to ± 4.17 A, +11.76 +12.24 V dc VIN = 18 to 40 V dc Full VI I O = ± 0.42 A to ± 4.17 A, +11.76 +12.24 V dc VIN = 16 to 50 V dc VIN = 18 to 40 V dc Full VI I O = ± 0.34 A to ± 3.34 A, +14.70 +15.30 V dc VIN = 18 to 40 V dc Full VI I O = ± 0.34 A to ± 3.34 A, +14.70 +15.30 V dc VIN = 16 to 50 V dc VIN = 18 to 40 V dc Full VI I O = ± 0.42 A to ± 4.17 A, –12.36 –11.64 V dc VIN = 18 to 40 V dc Full VI I O = ± 0.42 A to ± 4.17 A, –12.36 –11.64 V dc VIN = 16 to 50 V dc VIN = 18 to 40 V dc Full VI I O = ± 0.34 A to ± 3.34 A, –14.55 –15.45 V dc VIN = 18 to 40 V dc Full VI I O = ± 0.34 A to ± 3.34 A, –14.55 –15.45 V dc VIN = 16 to 50 V dc Line Regulation (12 V) +25 °CV I O = ± 4.17 A, 4 mV VIN = 18 to 40 V dc Line Regulation (15 V) +25 °CV I O = ± 3.34 A, 5 mV VIN = 18 to 40 V dc Load Regulation (12 V) +25 °CV V IN = 28 V dc, 4 mV IO = ± 0.42 A to +4.17 A Load Regulation (15 V) +25 °CV V IN = 28 V dc, 6 mV IO = ± 0.34 A to +3.34 A Output Ripple/Noise (Regulated +12 V) 5 +25°CI I O = ± 4.17 A, 45 mV p-p (Cross Regulated –12 V) 5 5 kHz – 2 MHz BW 55 mV p-p Output Ripple/Noise (Regulated +15 V) 5 +25°CI I O = ± 3.34 A, 45 mV p-p (Cross Regulated –15 V) 5 5 kHz – 2 MHz BW 50 mV p-p Total Output Current (I O) 12 V Full VI V O = ± 12 V dc, 0.833 8.34 A VIN = 18 to 40 V dc Total Output Current (I O) 15 V Full VI V O = ± 15 V dc, 0.68 6.68 A VIN = 18 to 40 V dc Output Overvoltage Protection (12 V) +25 °CV I O = ± 4.17 A, Open 118 % V nom Remote Sense Connection Output Overvoltage Protection (15 V) +25 °CV I O = ± 3.34 A, Open 118 % V nom Remote Sense Connection Output Current Limit (12 V/15 V) +25 °CV V O = 90% VOUT Nom 130 130 % I O max Output Short Circuit Current (12 V/15 V) +25 °C I 15.5 14.5 A ISOLATION CHARACTERISTICS Isolation Voltage +25 °C I Input to Output or Any Pin 100 100 M Ω to Case at 500 V dc REV. A–2– (TC = 258C, VIN = 28 V dc unless otherwise noted; full temperature range is –55 8C to +908C; all temperatures are case and T C is the temperature measured at the center of the package bottom.) ADDC02812DA/ADDC02815DA–SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

Case Test ADDC02812DA ADDC02815DA Parameter Temp Level Conditions Min Typ Max Min Typ Max Units DYNAMIC CHARACTERISTICS 6 Output Voltage Deviation Due to Step +25 °CV I O = ± 2.08 A to ± 4.17 A 0.850 V Change in Load (12 V) or ± 4.17 A to ± 2.08 A Output Voltage Deviation Due to Step +25 °CV I O = ± 1.67 A to ± 3.34 A 0.850 V Change in Load (15 V) or ± 3.34 A to ± 1.67 A Response Time Due to Step +25 °CV I O = ± 2.08 A to ± 4.17 A 150 µs Change in Load (12 V) or ± 4.17 A to ± 2.08 A di/dt = 0.5 A/ µs, Measured to Within 2% of Final Value Response Time Due to Step Change +25 °CV I O = ± 1.67 A to ± 3.34 A or 150 µs in Load (15 V) ± 3.34 A to ± 1.67 A, di/dt = 0.5 A/ µs, Measured to Within 2% of Final Value Soft Start Turn-On Time (12 V) +25 °CI I O = ± 4.17 A, from Inhibit 6 15 ms High to Status High Soft Start Turn-On Time (15 V) +25 °CI I O = ± 3.34 A, from Inhibit 6 15 ms High to Status High THERMAL CHARACTERISTICS Efficiency (12 V) +25 °CI I O = ± 2.5 A 81 85 % +90°CV I I O = ± 2.5 A 81 % –55°CV I I O = ± 2.5 A 80 % +25°CI I O = ± 4.17 A 81 85 % +90°CV I I O = ± 4.17 A 81 % –55°CV I I O = ± 4.17 A 80 % Efficiency (15 V) +25 °CI I O = ± 2.0 A 81 85 % +90°CV I I O = ± 2.0 A 81 % –55°CV I I O = ± 2.0 A 80 % +25°CI I O = ± 3.34 A 81 85 % +90°CV I I O = ± 3.34 A 81 % –55°CV I I O = ± 3.34 A 80 % Hottest Junction Temperature 7 (12 V) +90 °CV I O = ± 4.17 A 110 °C Hottest Junction Temperature 7 (15 V) +90 °CV I O = ± 3.34 A 110 °C CONTROL CHARACTERISTICS Clock Frequency (12 V) Full VI I O = ± 0.42 A 0.85 0.99 MHz Clock Frequency (15 V) Full VI I O = ± 0.34 A 0.85 0.99 MHz Adjust (Pin 3) V ADJ (12 V) +25 °C I 4.7 4.8 4.9 V Adjust (Pin 3) V ADJ (15 V) +25 °C I 5.9 6.0 6.1 V Status (Pin 4) VOH +25°CI I OH = 400 µA 2.4 4.0 2.4 4.0 V VOL +25°CI I OL = 1 mA 0.15 0.7 0.15 0.7 V VAUX (Pin 5) VO (nom) (12 V) +25 °CI I AUX = 5 mA, Load 13.00 13.5 14.00 V Current = ± 4.17 A VAUX (Pin 5) VO (nom) (15 V) +25 °CI I AUX = 5 mA, Load 13.5 13.9 14.5 V Current = ± 3.34 A Inhibit (Pin 6) VIL +25°C I 0.5 0.5 V IIL +25°CI V IL = 0.5 V 1.2 1.2 mA VI (Open Circuit) +25 °C I 15 15 V SYNC (Pin 7)8 VIH +25°C I 4.0 4.0 V IIH +25°CI V IH = 7.0 V 175 175 µA ISHARE (Pin 8) (12 V) +25 °C I Load Current = ± 4.17 A 2.65 2.75 2.85 V ISHARE (Pin 8) (15 V) +25 °C I Load Current = ± 3.34 A 2.65 2.75 2.85 V Temp (Pin 9) +25 °C V 3.90 3.90 V NOTES 1Military subgroups apply only to military qualified devices. 250 V dc upper limit rated for transient condition of up to 50 ms. 16 V dc lower limit rated for continuous operation during em ergency condition. Steady state and abnormal input voltage range require source impedance sufficient to insure input stability at low line. See sections entitled System In stability Considerations and Input Voltage Range. 3Measured at the remote sense points. 4Output characteristics tested with balanced loads on each output; however, unit operates with unbalanced loads up to 90%/10% sp lit. 5Regulated output typically performs with less ripple than cross regulated output. 100% test is performed with VD+ regulated and VD– cross regulated. 6CLOAD = 0. 7Refer to section entitled Thermal Characteristics for more information. 8Unit has internal pull-down; refer to section entitled Pin 7 (SYNC). Specifications subject to change without notice. REV. A –3– ADDC02812DA/ADDC02815DA

–4– ADDC02812DA/ADDC02815DA REV. A ABSOLUTE MAXIMUM RATINGS* *Absolute maximum ratings are limiting values, to be applied individually, and beyond which the serviceability of the circuit may be impaired. Functional operability under any of these conditions is not necessarily implied. Exposure of absolute maximum rating conditions for extended periods of time may affect device reliability. ORDERING GUIDE Operating Temperature Package Model Range (Case) Description ADDC02812DAKV –40 °C to +85°C Hermetic ADDC02812DATV –55 °C to +90°C Hermetic 5962-9684101HXC (ADDC02812DATV/QMLH) –55 °C to +125°C Hermetic ADDC02815DAKV –40 °C to +85°C Hermetic ADDC02815DATV –55 °C to +90°C Hermetic 5962-9684201HXC (ADDC02815DATV/QMLH) –55 °C to +125°C Hermetic EXPLANATION OF TEST LEVELS Test Level I – 100% production tested. II – 100% production tested at +25 °C, and sample tested at specified temperatures. III – Sample tested only. IV – Parameter is guaranteed by design and characterization testing. V – Parameter is a typical value only. VI – All devices are 100% production tested at +25 °C. 100% production tested at temperature extremes for military temperature devices; guaranteed by design and charac- terization testing for industrial devices. PIN CONFIGURATION 11 12 TOP VIEW PIN DESCRIPTIONS Pin No. Name Function 1 –SENSE Feedback loop connection for remote sensing output voltage. Must always be connected for proper operation. 2 +SENSE Feedback loop connection for remote sensing output voltage. Must always be connected for proper operation. 3 ADJUST Adjusts output voltage setpoint.

4 STATUS Indicates output voltage is within ± 5% of

nominal. Active high referenced to –SENSE (Pin 1). AUX Low level dc auxiliary voltage supply refer- enced to input return (Pin 10). 6 INHIBIT Power supply disable. Active low and refer- enced to input return (Pin 10).

7 SYNC Clock synchronization input for multiple

units; referenced to input return (Pin 10). 8I SHARE Current share pin which allows paralleled units to share current typically within ± 5% at full load; referenced to input return (Pin 10).

9 TEMP Case temperature indicator and temperature

shutdown override; referenced to input return (Pin 10). 10 –V IN Input Return. 11 +V IN +28 V Nominal Input Bus. 12 +V OUT +12 V dc Output (ADDC02812DA). +15 V dc Output (ADDC02815DA). 13 +V OUT +12 V dc Output (ADDC02812DA). +15 V dc Output (ADDC02815DA). 14 V COMMON Output Return. 15 V COMMON Output Return. 16 –V OUT –12 V dc Output (ADDC02812DA). –15 V dc Output (ADDC02815DA). 17 –V OUT –12 V dc Output (ADDC02812DA). –15 V dc Output (ADDC02815DA). CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADDC02812DA/ADDC02815DA feature proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. WARNING! ESD SENSITIVE DEVICE

Figure 13. Conducted Emissions, MIL-STD-461D, CE101, Figure 14. Conducted Emissions, MIL-STD-461D, CE102, Figure 15. Radiated Emissions, MIL-STD-461D, RE101,

100 W Load

Figure 16. Radiated Emissions, MIL-STD-461D, RE102, ADDC028012DA and the ADDC02815DA converters. Figure 17. Schematic of Test Setup for EMI Measurements INTRODUCED BY THE LISNs. REFER TO SECTION ON EMI CONSIDERATIONS FOR MORE INFORMATION.

converter’s unity gain crossover frequency and phase margin. Consult factory if long remote sense leads are to be used. trip at the standard levels of the newly adjusted output voltage. care should be taken in the routing of connections. place a resistor from ADJUST (Pin 3) to +SENSE (Pin 2). Figure 18. External Resistor Value for Reducing Output section entitled EMI Considerations. protects the load against a break in the remote sense leads. verter when the input voltage exceeds (nominally) 52.0 V dc. vents it from becoming too hot if the heat removal system fails. set to trip at a nominal case temperature of 110 °C to 115°C. extended time in a no load condition. return line is provided for miscellaneous system use.

REV. A –11– Input Voltage Transient Protection : The converters have a transient voltage suppressor connected across their input leads to protect the units against high voltage pulses (both positive and negative) of short duration. With the power supply con- nected in the typical system setup shown in Figure 17, a tran- sient voltage pulse is created across the converter in the following manner. A 20 µF capacitor is first charged to 400 V. It is then connected directly across the converter’s end of the two meter power lead cable through a 2 Ω on-state resistance MOSFET. The duration of this connection is 10 µs. The pulse is repeated every second for 30 minutes. This test is repeated with the connection of the 20 µF capacitor reversed to create a negative pulse on the supply leads. (If continuous reverse volt- age protection is required, a diode can be added externally in series at the expense of lower efficiency for the power system.) The converter responds to this input transient voltage test by shutting down due to its input overvoltage protection feature. Once the pulse is over, the converter initiates a soft-start, which is completed before the next pulse. No degradation of converter performance occurs. THERMAL CHARACTERISTICS Junction and Case Temperatures : It is important for the user to know how hot the hottest semiconductor junctions within the converter get and to understand the relationship between junction, case, and ambient temperatures. The hottest semiconductors in the 100 W product line of Analog Devices’ high density power supplies are the switching MOSFETs and the output rectifiers. There is an area inside the main power transformers that is hotter than these semiconductors, but it is within NAVMAT guidelines and well below the Curie tempera- ture of the ferrite. (The Curie temperature is the point at which the ferrite begins to lose its magnetic properties.) Since NAVMAT guidelines require that the maximum junction temperature be 110°C, the power supply manufacturer must specify the temperature rise above the case for the hottest semi- conductors so the user can determine what case temperature is required to meet NAVMAT guidelines. The thermal charac- teristics section of the specification table states the hottest junc- tion temperature for maximum output power at a specified case temperature. The unit can operate to higher case temperatures than 90°C, but 90°C is the maximum temperature that permits NAVMAT guidelines to be met. Case and Ambient Temperatures : It is the user’s responsi- bility to properly heat sink the power supply in order to maintain the appropriate case temperature and, in turn, the maximum junction temperature. Maintaining the appropriate case tem- perature is a function of the ambient temperature and the mechan ical heat removal system. The static relationship of these variables is established by the following formula: T C = TA + (PD × RθCA) where T C = case temperature measured at the center of the package bottom, TA = ambient temperature of the air available for cooling, PD = the power, in watts, dissipated in the power supply, RθCA = the thermal resistance from the center of the package to free air, or case to ambient. The power dissipated in the power supply, PD, can be calculated from the efficiency, h, given in the data sheets and the actual output power, PO, in the user’s application by the following formula: PD = PO η ±1 For example, at 80 W of output power and 80% efficiency, the power dissipated in the power supply is 20 W. If under these conditions, the user wants to maintain NAVMAT deratings (i.e., a case temperature of approximately 90 °C) with an ambi- ent temperature of 75 °C, the required thermal resistance, case to ambient, can be calculated as 90 = 75 + (20 × RθCA) or RθCA = 0.75°C/W This thermal resistance, case to ambient, will determine what kind of heat sink and whether convection cooling or forced air cooling is required to meet the constraints of the system. SYSTEM INSTABILITY CONSIDERATIONS In a distributed power supply architecture, a power source provides power to many “point-of-load” (POL) converters. At low frequencies, the POL converters appear incrementally as negative resistance loads. This negative resistance could cause system instability problems.

converter therefore looks, incrementally, as a negative resistor. at light load and high input line, it is its largest. resist or, RS, the network of Figure 25 results. Figure 25. Model of Power Source and POL Converter N is smallest at this operating condition. place a small resistor in series with this extra capacitor. resistance” to the LC network. latory, or it may cause the entire system to be unstable. verter for frequencies into the several kHz range (see Figure 12).

REV. A –13– NAVMAT DERATING NAVMAT is a Navy power supply reliability manual that is frequently cited by specifiers of power supplies. A key section of NAVMAT P4855-1A discusses guidelines for derating designs and their components. The two key derating criteria are voltage derating and power derating. Voltage derating is done to reduce the possibility of electrical breakdown, whereas power derating is done to maintain the component material below a specified maximum temperature. While power deratings are typically stated in terms of current limits (e.g., derate to x% of maximum rating), NAVMAT also specifies a maximum junction temperature of the semiconductor devices in a power supply. The NAVMAT component deratings applicable to the ADDC02812DA and ADDC02815DA are as follows: Resistors 80% voltage derating 50% power derating Capacitors 50% voltage and ripple voltage derating 70% ripple current derating Transformers and Inductors 60% continuous voltage and current derating 90% surge voltage and current derating 20°C less than rated core temperature 30°C below insulation rating for hot spot temperature 25% insulation breakdown voltage derating 40°C maximum temperature rise Transistors 50% power derating 60% forward current (continuous) derating 75% voltage and transient peak voltage derating 110°C maximum junction temperature Diodes (Switching, General Purpose, Rectifiers) 70% current (surge and continuous) derating 65% peak inverse voltage derating 110°C maximum junction temperature Diodes (Zeners) 70% surge current derating 60% continuous current derating 50% power derating 110°C maximum junction temperature Microcircuits (Linears) 70% continuous current derating 75% signal voltage derating 110°C maximum junction temperature The ADDC02812DA and ADDC02815DA, with one excep- tion, can meet all the derating criteria listed above. However, there are a few areas of the NAVMAT deratings where meeting the guidelines unduly sacrifices performance of the circuit. Therefore, the standard unit makes the following exceptions. Common-Mode EMI Filter Capacitors : The standard supply uses 500 V capacitors to filter common-mode EMI. NAVMAT guidelines would require 1000 V capacitors to meet the 50% voltage derating (500 V dc input to output isolation), resulting in less common-mode capacitance for the same space. In typical electrical power supply systems, where the load ground is eventually connected to the source ground, common- mode voltages never get near the 500 V dc rating of the stan- dard supply. Therefore, a lower voltage rating capacitor (500 V) was chosen to fit more capacitance in the same space in order to better meet the conducted emissions requirement of MIL-STD- 461D (CE102). For those applications which require 250 V or less of isolation from input to output, the present designs would meet NAVMAT guidelines. Switching Transistors: 100 V MOSFETs are used in the standard unit to switch the primary side of the transformers. Their nominal off-state voltage meets the NAVMAT derating guidelines. When the MOSFETs are turned off, however, momentary spikes occur that reach 100 V. The present genera- tion of MOSFETs are rated for repetitive avalanche, a condition that was not considered by the NAVMAT deratings. In the worst case condition, the energy dissipated during avalanche is 1% of the device’s rated repetitive avalanche energy. To meet the NAVMAT derating, 200 V MOSFETs could be used. The

100 V MOSFETs are used instead for their lower on-state resis-

tance, resulting in higher efficiency for the power supply. Output Rectifiers (ADDC02815DA only) : Schottky diodes are used as output rectifiers for the ± 15 V dc converter. The reverse voltage stress on these diodes under normal operating conditions is 75% of their maximum rating, compared to a NAVMAT derating guideline of 65%.

–14– ADDC02812DA/ADDC02815DA REV. A It should be noted that there are several areas of ambiguity with respect to CE102 measurements that may concern the systems engineer. One area of ambiguity in this measurement is the nature of the load. If it is constant, then the ripple voltage on the converter’s input leads is due only to the operation of the converter. If, on the other hand, the load is changing over time, this variation causes an additional input current and voltage ripple to be drawn at the same frequency. If the frequency is high enough, the converter’s filter will help attenuate this sec- ond source of ripple, but if it is below approximately 100 kHz, it will not. The system may then not meet the CE102 require- ment, even though the converter is not the source of the EMI. If this is the case, additional capacitance may be needed across the load or across the input to the converter. Another ambiguity in the CE102 measurement concerns common -mode voltage. If the load is left unconnected from the ground plane (even though the case is grounded), the common- mode ripple voltages will be smaller than if the load is grounded. The test specifications do not state which procedure should be used. However, in neither case (load grounded or floating) will the typical EMI test setup described below be exactly represen- tative of the final system configuration EMI test. For the follow- ing reasons, the same is true if separately packaged EMI filters are used. In almost all systems the output ground of the converter is ulti- mately connected to the input ground of the system. The para- sitic capacitances and inductances in this connection will affect the common-mode voltage and the CE102 measurement. In additi on, the inductive impedance of this ground connection can cause resonances, thereby affecting the performance of the common-mode filter in the power supply. In response to these ambiguities, the Analog Devices converter has been tested for CE102 under a constant load and with the output ground floating. While these measurements are a good indication of how the converter will operate in the final system configuration, the user should confirm CE102 testing in the final system configuration. CE101: This test measures emissions on the input leads in the frequency range between 30 Hz and 10 kHz. The intent of this requirement is to ensure that the dc/dc converter does not corrupt the power quality (allowable voltage distortion) on the power buses present on the platform. There are several CE101 limit curves in MIL-STD-461D. The most stringent one applicable for the converter is the one for submarine applications. Figure 13 shows that the converter easily meets this requirement (the return line measurement is similar). The components at 60 Hz and its harmonics are a result of ripple in the output of the power source used to supply the converter. NAVMAT Junction Temperatures : The two types of power deratings (current and temperature) can be independent of one another. For instance, a switching diode can meet its derating of 70% of its maximum current, but its junction temperature can be higher than 110°C if the case temperature of the converter, which is not controlled by the manufacturer, is allowed to go higher. Since some users may choose to operate the power sup- ply at a case temperature higher than 90 °C, it then becomes important to know the temperature rise of the hottest semicon- ductors. This is covered in the specification table in the section entitled “Thermal Characteristics.” EMI CONSIDERATIONS The ADDC02812DA and ADDC02815DA have an integral differential- and common-mode EMI filter that is designed to meet all applicable requirements in MIL-STD-461D when the power converter is installed in a typical system setup (described below). The converter also contains transient protection cir- cuitry that permits the unit to survive short, high voltage tran- sients across its input power leads. The purpose of this section is to describe the various MIL-STD-461D tests and the converter’s corresponding performance. Consult factory for additional information. The figures and tests referenced herein were obtained from measurements on the ADDC02805SA, a single 5 V dc output converter. Since the construction and topology of the dual out- put converters are almost identical to the single output con- verter, and the component values of the EMI differential and common filter in the dual output converters are identical to the single output converter, the text references these figures and tests as typical of the ADDC02812DA and ADDC02815DA converters. Electromagnetic interference (EMI) is governed by MIL-STD- 461D, which establishes design requirements, and MIL-STD- 462D, which defines test methods. EMI requirements are categorized as follows (xxx designates a three digit number):

• CExxx: conducted emissions (EMI produced internal to the power supply which is conducted externally through its input power leads)
• CSxxx: c onducted susceptibility (EMI produced external to the power supply which is conducted internally through the input power leads and may interfere with the supply’s operation)
• RExxx: radiated emissions (EMI produced internal to the power supply which is radiated into the surrounding space)
• RSxxx: radiated susceptibility (EMI produced external to the power supply which radiates into or through the power supply and may interfere with its proper operation)

REV. A –15– CE102: This test measures emissions in the frequency range between 10 kHz and 10 MHz. The measurements are made on both of the input leads of the converter which are connected to the power source through LISNs. The intent of this requirement in the lower frequency portion of the requirement is to ensure that the dc/dc converter does not corrupt the power quality (allowable voltage distortion) on the power buses present on the platform. At higher frequencies, the intent is to serve as a sepa- rate control from RE102 on potential radiation from power leads which may couple into sensitive electronic equipment. Figure 14 shows the CE102 limit and the measurement taken from the +V IN line. While the measurement taken from the input return line is slightly different, both comfortably meet the MIL-STD-461D, CE102 limit. CS101: This test measures the ability of the converter to reject low frequency differential signals, 30 Hz to 50 kHz, injected on the dc inputs. The measurement is taken on the output power leads. The intent is to ensure that equipment performance is not degraded from ripple voltages associated with allowable dis- tortion of power source voltage waveforms. Figure 10 shows a typical audio susceptibility graph. Note that according to the MIL-STD-461D test requirements, the injected signal between

30 Hz and 5 kHz has an amplitude of 2 V rms and from 5 kHz

to 50 kHz the amplitude decreases inversely with frequency to 0.2 V rms. The curve of the injected signal should be multiplied by the audio susceptibility curve to determine the output ripple at any frequency. When this is done, the worst case output ripple at the frequency of the input ripple occurs at 5 kHz, at which point there is typically a 25 mV peak-to-peak output ripple. It should be noted that MIL-STD-704 has a more relaxed requirement for rejection of low frequency differential signals injected on the dc inputs than MIL-STD-461D. MIL-STD- 704 calls for a lower amplitude ripple to be injected on the input in a narrower frequency band, 10 Hz to 20 kHz. CS114: This test measures the ability of the converter to operate correctly during and after being subjected to currents injected into bulk cables in the 10 kHz to 400 MHz range. Its purpose is to simulate currents that would be developed in these cables due to electromagnetic fields generated by antenna transmissions. The converter is designed to meet the requirements of this test when the current is injected on the input power leads cable. Consult factory for more information. CS115: This test measures the ability of the converter to oper- ate correctly during and after being subjected to 30 ns long pulses of current injected into bulk cables. Its purpose is to simulate transients caused by lightning or electromagnetic pulses. The converter is designed to meet this requirement when applied to its input power leads cable. Consult factory for more information. CS116: This test measures the ability of the converter to oper- ate correctly during and after being subjected to damped sinu- soid transients in the 10 kHz to 100 MHz range. Its purpose is to simulate current and voltage waveforms that would occur when natural resonances in the system are excited. The con- verter is designed to meet this requirement when applied to its input power leads cable. Consult factory for more information. RE101: This requirement limits the strength of the magnetic field created by the converter in order to avoid interference with sensitive equipment located nearby. The measurement is made from 30 Hz to 100 kHz. The most stringent requirement is for the Navy. Figure 15 shows the test results when the pickup coil is held 7 cm above the converter. As can be seen, the converter easily meets this requirement. RE102: This requirements limits the strength of the electric field emissions from the power converter to protect sensitive receivers from interference. The measurement is made from 10 kHz to 18 GHz with the antenna oriented in the vertical plane. For the 30 MHz and above range the standard calls for the measurement to be made with the antenna oriented in the horizontal plane, as well. In a typical power converter system setup, the radiated emis- sions can come from two sources: (1) the input power leads as they extend over the two meter distance between the LISNs and the converter, as required for this test, and (2) the converter output leads and load. The latter is likely to create significant emissions if left uncovered since minimal EMI filtering is pro- vided at the converter’s output. It is typical, however, that the power supply and its load would be contained in a conductive enclosure in applications where this test is applicable. A metal screen enclosure was therefore used to cover the converter and its load for this test.

Note: The value of C1 is dependent on source impedance. NOTE: VALUE OF C1 IS DEPENDENT ON SOURCE IMPEDANCE. REFER TO SECTION ON SYSTEM INSTABILITY CONSIDERATIONS. Figure 28. Typical Power Connections and External Parts NOTE: VALUE OF C1 IS DEPENDENT ON SOURCE IMPEDANCE. REFER TO SECTION ON SYSTEM INSTABILITY CONSIDERATIONS. Figure 29. Typical Connections for Providing 24 V Output/

30 V Output from ADDC02812DA/ADDC02815DA Re-

REV. A –19– NOMINAL CASE DIMENSIONS IN INCHES AND (mm) [All tolerances ± 0.005" ( ± 0.13 mm) unless otherwise specified] 0.150 (3.81) 0.100 (2.54)

8 PLCS

0.200 (5.08) 0.150 (3.81) 0.200 (5.08) 0.390 6 0.010 (9.91 6 0.25) 0.800 6 0.010

2 PLCS

0.150 (3.81)

4 PLCS

0.149 (3.78) DIA TYP 0.300 (7.62) SQ 6 0.010 0.200 (5.08) 5 PLCS 0.250 (6.35) 1.500 6 0.010 (38.10 6 0.25) 0.040 6 0.003 (1.02 6 0.08) 0.090 6 0.010 (2.29 6 0.25) 2.745 6 0.010 (69.72 6 0.25) 1.800 (45.72) TYP 2.100 6 0.010 (53.34 6 0.25) NOTES 1The final product weight is 85 grams maximum. 2The package base material if made of molybdenum and is nominally 40 mils (1.02 mm) thick. The “runout” is less than 2 mils per inch (0.02 mm per cm). 3The high current pins (10–17) are 40 mil (1.02 mm) diameter; are 99.8% copper; and are plated with gold over nickel. 4The signal carrying pins (1–9) are 18 mil (0.46 mm) diameter; are Kovar; and are plated with gold over nickel. 5All pins are a minimum length of 0.740 inches (18.80 mm) when the product is shipped. The pins are typically bent up or down an d cut shorter for proper connec- tion into the user’s system. 6All pin-to-sidewall spacings are guaranteed for a minimum of 500 V dc breakdown at standard air pressure. 7The case outline was originally designed using the inch-pound units of measurement. In the event of conflict between the metri c and inch-pound units, the inch- pound shall take precedence. Screening Levels for ADDC02812DA AND ADDC02815DA Screening Steps Industrial (KV) Ruggedized Industrial (TV) MIL-STD-883B/SMD (TV/QMLH) Pre-Cap Visual 100% MIL-STD-883, TM2017 Temp Cycle N/A N/A Constant Acceleration N/A N/A Fine Leak Guaranteed to Meet Guaranteed to Meet MIL-STD-883, TM1014 MIL-STD-883, TM1014 Compliant to MIL-PRF-38534 Gross Leak Guaranteed to Meet Guaranteed to Meet MIL-STD-883, TM1014 MIL-STD-883, TM1014 Burn-In N/A MIL-STD-883, TM1015,

96 Hrs at +115°C Case

Final Electrical Test At +25 °C, Per Specification At +25 °C, Per Specification Table Table

–20– C2133a–4–12/97PRINTED IN U.S.A.