JBW050A

Data Sheet March 27, 2008 JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Features n Small size: 61.0 mm x 57.9 mm x 12.7 mm (2.40 in. x 2.28 in. x 0.50 in.) High power density High efficiency: 84% typical Low output noise Constant frequency Industry-standard pinout Metal case 2:1 input voltage range Overtemperature protection Overcurrent and overvoltage protection Remote sense Remote on/off Adjustable output voltage: 60% to 110% of VO, nom Case ground pin ISO9001 Certified manufacturing facilities UL* 60950 Recognized, CSA † C22.2 No. 6095000 Certified, and EN 60950 (VDE0805):2001-12 Licensed CE mark meets 73/23/EEC and 93/68/EEC directives‡ n n n n n n The JBW050A Power Module use advanced, surface-mount technology and deliver high-quality, efficient, and compact dc-dc conversion. n n n Applications n n n n n n n n n n Distributed power architectures Workstations Computer equipment Communications equipment Options n n n n Heat sinks available for extended operation Choice of remote on/off logic configuration Approved for basic insulation (-B suffix) Short Pins n * UL is a registered trademark of Underwriters Laboratories, Inc. † CSA is a registered trademark of Canadian Standards Assn. ‡ This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment should be followed. (The CE mark is placed on selected products.) Description The JBW050A Power Module is a dc-dc converter that operates over an input voltage range of 36 Vdc to 75 Vdc and provides a precisely regulated 5 Vdc output. The output is fully isolated from the input, allowing a versatile polarity configuration and grounding connections. The module has a maximum power rating of 50 W at a typical full-load efficiency of 84%. The modules are DC board-mountable and encapsulated in metal cases. Threaded-through holes are provided to allow easy mounting or addition of a heat sink for high-temperature applications. The standard feature set includes remote sensing, output trim, and remote on/off for convenient flexibility in distributed power applications. JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Data Sheet March 27, 2008 Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Parameter Input Voltage: Continuous: Transient (100 ms) I/O Isolation Voltage Operating Case Temperature (See Thermal Considerations section.) Storage Temperature Symbol VI VI, trans — TC Tstg Min — — — –40 –55 Max 75 100 1500 100 125 Unit Vdc V Vdc °C °C Electrical Specifications Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. Table 1. Input Specifications Parameter Operating Input Voltage Maximum Input Current (VI = 0 V to 75 V; IO = IO, max): JBW050A (See Figure 1.) Inrush Transient Input Reflected-ripple Current, Peak-to-peak (5 Hz to 20 MHz, 12 µH source impedance; see Figure 8.) Input Ripple Rejection (120 Hz) Fusing Considerations 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 preserve 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 fast-acting fuse with a maximum rating of 10 A (see Safety Considerations section). Based on the information provided in this data sheet on inrush energy and maximum dc input current, the same type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data for further information. Symbol VI Min 36 Typ 48 Max 75 Unit Vdc II, max i 2t II — — — — — 5 1.7 1.0 — A A2s mAp-p — — 60 — dB 2 Lineage Power Data Sheet March 27, 2008 JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Electrical Specifications (continued) Table 2. Output Specifications Parameter Output Voltage Set Point (VI = 48 V; IO = IO, max; TC = 25 °C) Output Voltage (Over all operating input voltage, resistive load, and temperature conditions until end of life. See Figure 10.) Output Regulation: Line (VI = 36 V to 75 V) Load (IO = IO, min to IO, max) Temperature (TC = –40 °C to +100 °C) Output Ripple and Noise Voltage (See Figure 9.): RMS Peak-to-peak (5 Hz to 20 MHz) External Load Capacitance Output Current (At IO < IO, min, the modules may exceed output ripple specifications.) Output Current-limit Inception (VO = 90% of VO, nom) Output Short-circuit Current (VO = 250 mV) Efficiency (VI = 48 V; IO = IO, max; TC = 70 °C) Switching Frequency Dynamic Response (ΔIO/Δt = 1 A/10 µs, VI = 48 V, TC = 25 °C; tested with a 10 µF aluminum and a 1.0 µF ceramic capacitor across the load): (see Figures 5 and 6) Load Change from IO = 50% to 75% of IO, max: Peak Deviation Settling Time (VO < 10% of peak deviation) Load Change from IO = 50% to 25% of IO, max: Peak Deviation Settling Time (VO < 10% of peak deviation) Symbol VO, set VO Min 4.92 4.85 Typ 5.0 — Max 5.08 5.15 Unit Vdc Vdc — — — — — — 0.01 0.05 15 0.1 0.2 50 %VO %VO mV — — — IO — — 0 0.5 — — — — 40 150 * 10 mVrms mVp-p µF A IO, cli — η — — — — — 11.2 14.5 84 330 14† — — — A A % kHz — — — — — — — — 2 500 2 500 — — — — %VO, set µs %VO, set µs * Consult your sales representative or the factory. † These are manufacturing test limits. In some situations, results may differ. Lineage Power JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Data Sheet March 27, 2008 Electrical Specifications (continued) Table 3. Isolation Specifications Parameter Isolation Capacitance Isolation Resistance Min — 10 Typ 2500 — Max — — Unit pF MΩ General Specifications Parameter Calculated MTBF (IO = 80% of IO, max; TC = 40 °C) Weight — Min Typ 3,210,000 — 100 (3.5) Max Unit hr. g (oz.) Feature Specifications Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions for additional information. Parameter Remote On/Off Signal Interface (VI = 0 V to 75 V; open collector or equivalent compatible; signal referenced to VI(–) terminal; see Figure 11 and Feature Descriptions.): Preferred Logic: Logic Low—Module On Logic High—Module Off Optional Logic: Logic Low—Module Off Logic High—Module On Logic Low: At Ion/off = 1.0 mA At Von/off = 0.0 V Logic High: At Ion/off = 0.0 µA Leakage Current Turn-on Time (See Figure 7.) (IO = 80% of IO, max; VO within ±1% of steady state) Output Voltage Adjustment (See Feature Descriptions.): Output Voltage Remote-sense Range Output Voltage Set-point Adjustment Range (trim) Output Overvoltage Protection Overtemperature Protection (shutdown) Symbol Min Typ Max Unit Von/off Ion/off Von/off Ion/off — 0 — — — — — — — — 20 1.2 1.0 15 50 35 V mA V µA ms — — VO, clamp TC — 60 5.7 — — — — 105 0.5 110 7.0 — V %VO, nom V °C 4 Lineage Power Data Sheet March 27, 2008 JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Characteristic Curves The following figures provide typical characteristics for the power modules. The figures are identical for both on/off configurations. 2 1.8 INPUT CURRENT, II (A) 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 30 35 40 45 50 55 60 INPUT VOLTAGE, VI (V) 65 70 75 1-0689 88 86 EFFICIENCY, η (%) 84 82 80 78 76 74 72 70 0 1 2 3 4 5 6 7 8 9 10 1-0691 VI = 36 V VI = 48 V VI = 75 V OUTPUT CURRENT, IO (A) Figure 1. Typical Input Characteristics at Room Temperature Figure 3. Typical Converter Efficiency vs. Output Current at Room Temperature 6 OUTPUT VOLTAGE, VO (V) 5 4 3 2 1 0 36 V OUTPUT VOLTAGE, VO (V) (20 mV/div) 48 V 0 2 4 6 8 10 12 14 OUTPUT CURRENT, IO (A) 16 18 20 1-0690 75 V Figure 2. Typical Output Characteristics at Room Temperature TIME, t (2 µs/div) 1-0692 Figure 4. Typical Output Ripple Voltage at Room Temperature, IO = Full Load Lineage Power JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Data Sheet March 27, 2008 Characteristic Curves (continued) OUTPUT VOLTAGE, VO (V) OUTPUT CURRENT, IO (A) (50 mV/div) (2 A/div) OUTPUT VOLTAGE, VO (V) REMOTE ON/OFF PIN, (1 V/div) VON/OFF (V) TIME, t (5 ms/div) 1-0695 TIME, t (100 µs/div) 1-0693 Note: Tested with a 10 µF aluminum and a 1.0 µF ceramic capacitor across the load. Note: Tested with a 10 µF aluminum and a 1.0 µF ceramic capacitor across the load. Figure 7. Typical Start-Up from Remote On/Off; IO = IO, max Figure 5. Typical Transient Response to Step Decrease in Load from 50% to 25% of Full Load at Room Temperature and 48 V Input (Waveform Averaged to Eliminate Ripple Component.) Test Configurations TO OSCILLOSCOPE CURRENT PROBE VI(+) LTEST OUTPUT VOLTAGE, VO (V) OUTPUT CURRENT, IO (A) (50 mV/div) (2 A/div) 12 μH CS 220 μF ESR < 0.1 Ω @ 20 °C, 100 kHz BATTERY 33 μF ESR < 0.7 Ω @ 100 kHz VI(–) 8-203.l Note: Measure input reflected-ripple current with a simulated source inductance (LTEST) of 12 µH. Capacitor CS offsets possible battery impedance. Measure current as shown above. Figure 8. Input Reflected-Ripple Test Setup TIME, t (100 µs/div) 1-0694 Note: Tested with a 10 µF aluminum and a 1.0 µF ceramic capacitor across the load. Figure 6. Typical Transient Response to Step Increase in Load from 50% to 75% of Full Load at Room Temperature and 48 V Input (Waveform Averaged to Eliminate Ripple Component.) 6 Lineage Power Data Sheet March 27, 2008 JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Test Configurations (continued) Design Considerations Input Source Impedance COPPER STRIP VO(+) 1.0 μF VO(–) 10 μF SCOPE RESISTIVE LOAD 8-513.d The power module should be connected to a low ac-impedance input source. Highly inductive source impedances can affect the stability of the power module. For the test configuration in 8, a 33 µF electrolytic capacitor (ESR < 0.7 Ω at 100 kHz) mounted close to the power module helps ensure stability of the unit. For other highly inductive source impedances, consult the factory for further application guidelines. Note: Use a 1.0 µF ceramic capacitor and a 10 µF aluminum or tantalum capacitor. Scope measurement should be made using a BNC socket. Position the load between 51 mm and 76 mm (2 in. and 3 in.) from the module. Safety Considerations For safety-agency approval of the system in which the power module is used, the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standard, i.e., UL60950, CSA C22.2 No. 60950-00, and EN 60950 (VDE0805):2001-12. If the input source is non-SELV (ELV or a hazardous voltage greater than 60 Vdc and less than or equal to 75 Vdc), for the module’s output to be considered meeting the requirements of safety extra-low voltage (SELV), all of the following must be true: n Figure 9. Peak-to-Peak Output Noise Measurement Test Setup SENSE(+) VI(+) II SUPPLY VI(–) CONTACT RESISTANCE SENSE(–) VO(–) VO(+) CONTACT AND DISTRIBUTION LOSSES IO LOAD 8-749 The input source is to be provided with reinforced insulation from any hazardous voltages, including the ac mains. One VI pin and one VO pin are to be grounded or both the input and output pins are to be kept floating. The input pins of the module are not operator accessible. Another SELV reliability test is conducted on the whole system, as required by the safety agencies, on the combination of supply source and the subject module to verify that under a single fault, hazardous voltages do not appear at the module’s output. Note: All measurements are taken at the module terminals. When socketing, place Kelvin connections at module terminals to avoid measurement errors due to socket contact resistance. n n [ V O (+) – V O (–) ] I O η = ⎛ ----------------------------------------------- ⎞ x 100 ⎝ [ V I (+) – V I (–) ] I I ⎠ % n Figure 10. Output Voltage and Efficiency Measurement Test Setup Note: Do not ground either of the input pins of the module without grounding one of the output pins. This may allow a non-SELV voltage to appear between the output pin and ground. The power module has extra-low voltage (ELV) outputs when all inputs are ELV. The input to these units is to be provided with a maximum 10 A fast-acting fuse in the ungrounded lead. Lineage Power JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Data Sheet March 27, 2008 Feature Descriptions Overcurrent Protection To provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting circuitry and can endure current limiting for an unlimited duration. At the point of current-limit inception, the unit shifts from voltage control to current control. If the output voltage is pulled very low during a severe fault, the current-limit circuit can exhibit either foldback or tailout characteristics (output current decrease or increase). The unit operates normally once the output current is brought back into its specified range. Ion/off + Von/off – ON/OFF SENSE(+) VO(+) LOAD VI(+) VI(–) VO(–) SENSE(–) 8-720c Figure 11. Remote On/Off Implementation Remote On/Off Two remote on/off options are available. Positive logic remote on/off turns the module on during a logic-high voltage on the ON/OFF pin, and off during a logic low. Negative logic remote on/off turns the module off during a logic high and on during a logic low. Negative logic (code suffix “1”) is the factory-preferred configuration. To turn the power module on and off, the user must supply a switch to control the voltage between the on/off terminal and the VI(–) terminal (Von/off). The switch can be an open collector or equivalent (see Figure 11). A logic low is Von/off = 0 V to 1.2 V. The maximum Ion/off during a logic low is 1 mA. The switch should maintain a logic-low voltage while sinking 1 mA. During a logic high, the maximum Von/off generated by the power module is 15 V. The maximum allowable leakage current of the switch at Von/off = 15 V is 50 µA. If not using the remote on/off feature, do one of the following: n n Remote Sense Remote sense minimizes the effects of distribution losses by regulating the voltage at the remote-sense connections. The voltage between the remote-sense pins and the output terminals must not exceed the output voltage sense range given in the Feature Specifications table, i.e.: [VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] ≤ 0.5 V The voltage between the VO(+) and VO(–) terminals must not exceed the minimum value of the output overvoltage protection. This limit includes any increase in voltage due to remote-sense compensation and output voltage set-point adjustment (trim). See Figure 12. If not using the remote-sense feature to regulate the output at the point of load, then connect SENSE(+) to VO(+) and SENSE(–) to VO(–) at the module. Although the output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not the sum of both. The maximum increase is the larger of either the remote sense or the trim. Consult the factory if you need to increase the output voltage more than the above limitation. The amount of power delivered by the module is defined as the voltage at the output terminals multiplied by the output current. When using remote sense and trim, the output voltage of the module can be increased, which at the same output current would increase the power output of the module. Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power. For negative logic, short ON/OFF pin to VI(–). For positive logic, leave ON/OFF pin open. 8 Lineage Power Data Sheet March 27, 2008 JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W The voltage between the VO(+) and VO(–) terminals must not exceed the minimum value of the output overvoltage protection. This limit includes any increase in voltage due to remote-sense compensation and output voltage set-point adjustment (trim). See Figure 12. Although the output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not the sum of both. The maximum increase is the larger of either the remote sense or the trim. Consult the factory if you need to increase the output voltage more than the above limitation. 8-651m Feature Descriptions (continued) Remote Sense (continued) SENSE(+) SENSE(–) VI(+) SUPPLY II VI(–) CONTACT RESISTANCE VO(–) CONTACT AND DISTRIBUTION LOSSES VO(+) IO LOAD Figure 12. Effective Circuit Configuration for Single-Module Remote-Sense Operation Output Voltage Set-Point Adjustment (Trim) Output voltage trim allows the user to increase or decrease the output voltage set point of a module. This is accomplished by connecting an external resistor between the TRIM pin and either the SENSE(+) or SENSE(–) pins. The trim resistor should be positioned close to the module. If not using the trim feature, leave the TRIM pin open. With an external resistor between the TRIM and SENSE(–) pins (Radj-down), the output voltage set point (VO, adj) decreases (see Figure 13). The following equation determines the required external-resistor value to obtain a percentage output voltage change of Δ%. R adj-down 100 = ⎛ --------- – 2⎞ k Ω ⎝ Δ% ⎠ The amount of power delivered by the module is defined as the voltage at the output terminals multiplied by the output current. When using remote sense and trim, the output voltage of the module can be increased, which at the same output current would increase the power output of the module. Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power. VI(+) ON/OFF CASE VI(–) VO(+) SENSE(+) TRIM Radj-down SENSE(–) VO(–) 8-748b RLOAD Figure 13. Circuit Configuration to Decrease Output Voltage ADJUSTMENT RESISTOR VALUE (Ω) 1M The test results for this configuration are displayed in Figure 14. This figure applies to all output voltages. With an external resistor connected between the TRIM and SENSE(+) pins (Radj-up), the output voltage set point (VO, adj) increases (see Figure 15). The following equation determines the required external-resistor value to obtain a percentage output voltage change of Δ%. ) V O ( 100 + Δ % - ( 100 + 2 Δ % ) R adj-up = ⎛ ------------------------------------- – --------------------------------- ⎞ k Ω ⎝ 1.225 Δ % ⎠ Δ% The test results for this configuration are displayed in Figure 16. 100k 10k 1k 100 0 10 20 30 40 8-879 % CHANGE IN OUTPUT VOLTAGE (Δ%) Figure 14. Resistor Selection for Decreased Output Voltage Lineage Power JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Data Sheet March 27, 2008 Feature Descriptions (continued) Output Voltage Set-Point Adjustment (Trim) (continued) Thermal Considerations Introduction The power modules operate in a variety of thermal environments; however, sufficient cooling should be provided to help ensure reliable operation of the unit. Heat-dissipating components inside the unit are thermally coupled to the case. Heat is removed by conduction, convection, and radiation to the surrounding environment. Proper cooling can be verified by measuring the case temperature. Peak temperature (TC) occurs at the position indicated in Figure 17. 38.0 (1.50) 8-715b VI(+) ON/OFF CASE VI(–) VO(+) SENSE(+) Radj-up TRIM SENSE(–) VO(–) RLOAD Figure 15. Circuit Configuration to Increase Output Voltage VI(+) 10M VO(+) + SEN TRIM MEASURE CASE TEMPERATURE HERE ADJUSTMENT RESISTOR VALUE (Ω) 38.0 (1.50) ON/OFF 1M CASE VI(–) – SEN VO(–) 100k 8-716.f 10k 0 2 4 6 8 10 % CHANGE IN OUTPUT VOLTAGE (Δ%) Note: Top view, pin locations are for reference only. Measurements shown in millimeters and (inches). 8-880.a Figure 17. Case Temperature Measurement Location The maximum temperature per Figure 17 should not exceed 100 °C. The output power of the module should not exceed the rated power for the module as listed in the Ordering Information table. Although the maximum case temperature of the power modules is 90 °C to 100 °C, you can limit this temperature to a lower value for extremely high reliability. Note that although the maximum case temperature allowed is lower than 100 °C under some conditions, this modules derating is equivalent to or better than the JW050A. At full load, the JW050A power module has a higher case temperature rise than the JBW050A. For additional information on these modules, refer to the Thermal Management JC-, JFC-, JW-, and JFWSeries 50 W to 150 W Board-Mounted Power Modules Technical Note (TN97-008EPS). Figure 16. Resistor Selection for Increased Output Voltage Output Overvoltage Protection The output overvoltage clamp consists of control circuitry, independent of the primary regulation loop, that monitors the voltage on the output terminals. The control loop of the clamp has a higher voltage set point than the primary loop (see Feature Specifications table). This provides a redundant voltage control that reduces the risk of output overvoltage. Overtemperature Protection The module features an overtemperature protection circuit to safeguard against thermal damage. The circuit shuts down the module when the maximum case temperature is exceeded. The module restarts automatically after cooling. 10 10 Lineage Power Data Sheet March 27, 2008 JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Thermal Considerations (continued) 12 POWER DISSIPATION, PD (W) Heat Transfer Without Heat Sinks Increasing airflow over the module enhances the heat transfer via convection. Figure 19 shows the maximum power that can be dissipated by the module without exceeding the maximum case temperature versus local ambient temperature (TA) for natural convection through 3 m/s (600 ft./min.). Note that the natural convection condition was measured at 0.05 m/s to 0.1 m/s (10 ft./min. to 20 ft./min.); however, systems in which these power modules may be used can typically generate natural convection airflow rates of 0.3 m/s (60 ft./min.) due to other heat dissipating components in the system. The use of 19 is shown in the following example. Example What is the minimum airflow necessary for a JBW050A operating at VI = 54 V, an output current of 10 A, and a maximum ambient temperature of 70 °C? Solution Given: VI = 54 V IO = 10 A TA = 70 °C Determine PD (Use Figure 18): PD = 9.5 W Determine airflow (v) (Use Figure 19): v = 1.0 m/s (200 ft./min.) 12 POWER DISSIPATION, PD (W) 10 8 6 4 2 0 0 2 4 6 OUTPUT CURRENT, IO (A) 8 10 1-0697 10 8 6 4 2 0 MAX CASE TEMP 3.0 m/s (600 ft./min.) 2.0 m/s (400 ft./min.) 1.0 m/s (200 ft./min.) 0.5 m/s (100 ft./min.) 0.25 m/s (50 ft./min.) NATURAL CONVECTION 0 20 40 60 80 100 LOCAL AMBIENT TEMPERATURE, TA (˚C) 120 1-0705 Figure 19. Forced Convection Power Derating with No Heat Sink; Either Orientation Heat Transfer with Heat Sinks The power modules have through-threaded, M3 x 0.5 mounting holes, which enable heat sinks or cold plates to attach to the module. The mounting torque must not exceed 0.56 N-m (5 in.-lb.). For a screw attachment from the pin side, the recommended hole size on the customer’s PWB around the mounting holes is 0.130 ± 0.005 inches. If a larger hole is used, the mounting torque from the pin side must not exceed 0.25 N-m (2.2 in.-lb.). Thermal derating with heat sinks is expressed by using the overall thermal resistance of the module. Total module thermal resistance (θca) is defined as the maximum case temperature rise (ΔTC, max) divided by the module power dissipation (PD): (TC – TA θ ca = Δ T C, max = -----------------------) -------------------PD PD The location to measure case temperature (TC) is shown in Figure 17. Case-to-ambient thermal resistance vs. airflow is shown, for various heat sink configurations and heights, in Figure 20. These curves were obtained by experimental testing of heat sinks, which are offered in the product catalog. VI = 75 V VI = 48 V VI = 36 V Figure 18. Power Dissipation vs. Output Current Lineage Power JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Data Sheet March 27, 2008 Use Figure 20 to determine air velocity for the 1/2 inch heat sink. The minimum airflow necessary for the JBW050A module is 1.52 m/s (300 ft./min.). Thermal Considerations (continued) Heat Transfer With Heat Sinks (continued) 8 CASE-TO-AMBIENT THERMAL RESISTANCE, θCA (°C/W) 7 6 5 4 3 2 1 0 0 0.25 (50) 0.51 (100) 0.76 (150) 1.02 (200) 1.27 (250) 1.52 (300) 1.78 2.03 (350) (400) NO HEAT SINK 1/4 in. HEAT SINK 1/2 in. HEAT SINK 1 in. HEAT SINK 1 1/2 in. HEAT SINK Custom Heat Sinks A more detailed model can be used to determine the required thermal resistance of a heat sink to provide necessary cooling. The total module resistance can be separated into a resistance from case-to-sink (θcs) and sink-to-ambient (θsa) shown below (Figure 21). PD TC θcs TS θsa 8-1304 TA Figure 21. Resistance from Case-to-Sink and Sink-to-Ambient 8-1052.a AIR VELOCITY, ms-1 (ft./min.) Figure 20. Case-to-Ambient Thermal Resistance Curves; Either Orientation These measured resistances are from heat transfer from the sides and bottom of the module as well as the top side with the attached heat sink; therefore, the case-to-ambient thermal resistances shown are generally lower than the resistance of the heat sink by itself. The module used to collect the data in Figure 20 had a thermal-conductive dry pad between the case and the heat sink to minimize contact resistance. The use of Figure 20 is shown in the following example. Example If an 85 °C case temperature is desired, what is the minimum airflow necessary? Assume the JBW050A module is operating at VI = 54 V and an output current of 10 A, maximum ambient air temperature of 70 °C, and the heat sink is 1/2 inch. Solution Given: VI = 54 V IO = 10 A TA = 70 °C TC = 85 °C Heat sink = 1/2 in. Determine PD by using Figure 18: PD = 9.5 W Then solve the following equation: TC – TA θ ca = ------------------PD 85 – 70 θ ca = ----------------9.5 · θ ca = 1.58 °C/W For a managed interface using thermal grease or foils, a value of θcs = 0.1 °C/W to 0.3 °C/W is typical. The solution for heat sink resistance is: θ sa = ------------------------ – θ cs This equation assumes that all dissipated power must be shed by the heat sink. Depending on the userdefined application environment, a more accurate model, including heat transfer from the sides and bottom of the module, can be used. This equation provides a conservative estimate for such instances. ( TC – TA) PD Solder, Cleaning, and Drying Considerations Post solder cleaning is usually the final circuit-board assembly process prior to electrical testing. The result of inadequate circuit-board cleaning and drying can affect both the reliability of a power module and the testability of the finished circuit-board assembly. For guidance on appropriate soldering, cleaning, and drying procedures, refer to the Board-Mounted Power Modules Soldering and Cleaning Application Note (AP01-056EPS). EMC Considerations For assistance with designing for EMC compliance, please refer to the FLTR100V10 data sheet (FDS01-043EPS). Layout Considerations Copper paths must not be routed beneath the power module mounting inserts. For additional layout guidelines, refer to the FLTR100V10 data sheet (FDS01-043EPS). 12 12 Lineage Power Data Sheet March 27, 2008 JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Outline Diagram Dimensions are in millimeters and (inches). Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) x.xx mm ± 0.25 mm (x.xxx in. ± 0.010 in.) Top View 57.9 (2.28) MAX VI(+) ON/ OFF VO(+) 61.0 (2.40) MAX + SEN TRIM CASE - SEN VO(-) VI(-) Note:Pinout marking for reference only Side View 12.7 (0.50) MAX 0.51 (0.020) 1.02 (0.040) DIA SOLDER-PLATED BRASS, 7 PLACES 5.1 (0.20) MIN 2.06 (0.081) DIA SOLDER-PLATED BRASS, 2 PLACES (-OUTPUT AND +OUTPUT) Bottom View STANDOFF, 12.7 (0.50) MAX 4 PLACES 5.1 (0.20) 7.1 (0.28) MOUNTING INSERTS M3 x 0.5 THROUGH, 4 PLACES 7.1 (0.28) 4 3 5 6 7 2 1 8 9 10.16 (0.400) 50.8 (2.00) 25.40 (1.000) 10.16 (0.400) 17.78 (0.700) 25.40 (1.000) 35.56 (1.400) 35.56 (1.400) 48.26 (1.900) TERMINALS 4.8 (0.19) 48.3 (1.90) MOUNTING HOLES 1-0714 Lineage Power JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Data Sheet March 27, 2008 Recommended Hole Pattern Component-side footprint. Dimensions are in millimeters and (inches). 57.9 (2.28) MAX 4.8 (0.19) 48.3 (1.90) 48.26 (1.900) VI (+) VO (+) 35.56 (1.400) 50.8 (2.00) 25.40 (1.000) 10.16 (0.400) ON/OFF +SEN TRIM 35.56 (1.400) 25.40 (1.000) 10.16 (0.400) 17.78 (0.700) 61.0 (2.40) MAX CASE –SEN VI (–) VI (–) 5.1 (0.20) 12.7 (0.50) MAX MOUNTING INSERTS MODULE OUTLINE 8-1945a Ordering Information Table 4. Device Codes Input Voltage 48 V 48 V Table 5. Device Options Option* Short pins: 3.68 mm ± 0.25 mm (0.145 in. ± 0.010 in.) Approved for basic insulation Device Code Suffix** 6 -B Output Voltage 5.0 V 5.0 V Output Power 50 W 50 W Remote On/Off Logic Negative Positive Device Code JBW050A1 JBW050A Comcode 108975426 108966060 * Contact Lineage Power Sales Representatives for availability of these options, samples, minimum order quantity and lead times. ** When adding multiple options to the product code, add suffix numbers in the descending orders. 14 14 Lineage Power Data Sheet March 27, 2008 JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Ordering Information (continued) Table 6. Device Accessories Accessory 1/4 in. transverse kit (heat sink, thermal pad, and screws) 1/4 in. longitudinal kit (heat sink, thermal pad, and screws) 1/2 in. transverse kit (heat sink, thermal pad, and screws) 1/2 in. longitudinal kit (heat sink, thermal pad, and screws) 1 in. transverse kit (heat sink, thermal pad, and screws) 1 in. longitudinal kit (heat sink, thermal pad, and screws) 1 1/2 in. transverse kit (heat sink, thermal pad, and screws) 1 1/2 in. longitudinal kit (heat sink, thermal pad, and screws) Dimensions are in millimeters and (inches). Comcode 407243989 407243997 407244706 407244714 407244722 407244730 407244748 407244755 1/4 IN. 1/2 IN. 1 IN. 61 (2.4) 1 1/2 IN. 57.9 (2.28) D000c D000-d.cvs Figure 22. Longitudinal Heat Sink Figure 23. Transverse Heat Sink Lineage Power JBW050A Power Modules: dc-dc Converter; 36 to 75 Vdc Input, 5 Vdc Output; 50 W Data Sheet March 27, 2008 A sia-Pacific Head qu art ers T el: +65 6 41 6 4283 World W ide Headq u arters Lin eag e Po wer Co rp oratio n 30 00 Sk yline D rive, Mesquite, T X 75149, U SA +1-800-526-7819 (Outs id e U .S.A .: +1- 97 2-2 84 -2626 ) w ww.line ag ep ower.co m e-m ail: tech sup port1@ lin ea gep ower.co m E u ro pe, M id dle-East an d Afric a He ad qu arters T el: +49 8 9 6089 286 I nd ia Head qu arters T el: +91 8 0 28411633 Lineage Power reserves the right to make changes to the produc t(s) or information contained herein without notice. No liability is ass umed as a res ult of their use or applic ation. No rights under any patent acc ompany the sale of any s uc h pr oduct(s ) or information. © 2008 Lineage Power Corpor ation, (Mesquite, Texas ) All International Rights Res er ved. March 27, 2008 FDS02-039EPS (Replaces ADS02-012EPS)