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| Data Sheet October 1997 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Features Small size: 61.0 mm x 57.9 mm x 13.1 mm (2.40 in. x 2.28 in. x 0.52 in.) High power density High efficiency: 85% typical Low output noise Constant frequency Industry-standard pinout Metal baseplate 2:1 input voltage range Overtemperature protection (100 W only) Remote sense Remote on/off Adjustable output voltage Case ground pin The JC050B, JC075B, JC100B Power Modules use advanced, surface-mount technology and deliver high-quality, efficient, compact dc-dc conversion. Applications Distributed power architectures Workstations EDP equipment Telecommunications UL* Recognized, CSA Certified, VDE Licensed Options Choice of remote on/off logic configuration Heat sink available for extended operation Short Leads: 2.79 mm (0.110 in.) 3.68 mm (0.145 in.) * UL is a registered trademark of Underwriters Laboratories, Inc. CSA is a registered trademark of Canadian Standards Assn. Description The JC050B, JC075B, JC100B Power Modules are dc-dc converters that operate over an input voltage range of 18 Vdc to 36 Vdc and provide a precisely regulated dc output. The outputs are fully isolated from the inputs, allowing versatile polarity configurations and grounding connections. The modules have maximum power ratings from 50 W to 100 W at typical full-load efficiency of 85%. The sealed modules offer metal baseplate for excellent thermal performance. 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. JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Data Sheet October 1997 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 -40 Max 40 50 1500 100 110 Unit Vdc Vdc 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 36 V; IO = IO, max): JC050B (See Figure 1) JC075B (See Figure 2) JC100B (See Figure 3.) Inrush Transient Input Reflected-ripple Current, Peak-to-peak (5 Hz to 20 MHz, 12 H source impedance; see Figure 11.) 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 normal-blow, dc f use with a maximum rating of 20 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 18 Typ 28 Max 36 Unit Vdc II, max II, max II, max i2t -- -- -- -- -- -- -- -- -- -- 5 5.0 7.0 9.0 1.0 -- A A A A2s mAp-p -- -- 60 -- dB 2 Tyco Electronics Corp. Data Sheet October 1997 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Electrical Specifications (continued) Table 2. Output Specifications Parameter Output Voltage (Over all operating input voltage, resistive load, and temperature conditions until end of life; see Figure 13.) Output Voltage Set Point (VI = 28 V; IO = IO, max; TC = 25 C) Output Regulation: Line (VI = 18 V to 36 V) Load (IO = IO, min to IO, max) Temperature (TC = -40 C to +100 C) Output Ripple and Noise Voltage (See Figure 12.): RMS Peak-to-peak (5 Hz to 20 MHz) External Load Capacitance (electrolytic) Output Current (At IO < IO, min, the module may exceed output ripple specifications.) Output Current-limit Inception (VO = 90% of VO, nom) Output Short-circuit Current (VO = 250 mV) Efficiency (VI = 28 V; IO = IO, max; TC = 70 C) Device All Symbol VO Min 11.64 Typ -- Max 12.36 Unit Vdc All VO, set 11.78 -- 12.22 Vdc All All All -- -- -- -- -- -- 0.01 0.05 50 0.1 0.4 150 % % mV All All All JC050B JC075B JC100B JC050B JC075B JC100B All JC050B JC075B JC100B -- -- -- IO IO IO IO, cli IO, cli IO, cli -- -- -- 0 0.3 0.3 0.3 -- -- -- -- 82 83 83 -- -- -- -- -- -- 4.8 6.4 9.6 170 85 85 85 50 200 5,000 4.2 6.3 8.3 5.8 8.1 10.8 -- -- -- -- mVrms mVp-p F A A A A A A %IO, max % % % Dynamic Response (IO/t = 1 A/10 s, VI = 28 V, TC = 25 C): 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) Table 3. Isolation Specifications Parameter Isolation Capacitance Isolation Resistance All All All All -- -- -- -- -- -- -- -- 2 300 2 300 -- -- -- -- %VO, set s %VO, set s Min -- 10 Typ 2500 -- Max -- -- Unit pF M Tyco Electronics Corp. 3 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Data Sheet October 1997 General Specifications Parameter Calculated MTBF (IO = 80% of IO, max; TC = 40 C) Weight Min -- Typ 2,600,000 -- Max 100 (3.5) 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 36 V; open collector or equivalent compatible; signal referenced to VI(-) terminal; see Figure 14 and Feature Descriptions.): JCxxxB1 Preferred Logic: Logic Low--Module On Logic High--Module Off JCxxxB 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 A At Von/off = 15 V Turn-on Time (See Figure 10) (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 Clamp Overtemperature Shutdown (100 W only; see Feature Descriptions.) 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 A ms -- -- VO, clamp Tc -- 60 13.2 -- -- -- -- 105 1.2 110 16.0 -- V %VO, nom V C 4 Tyco Electronics Corp. Data Sheet October 1997 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Characteristic Curves The following figures provide typical characteristics for the JC050B, JC075B, JC100B power modules. The figures are identical for both on/off configurations. 4.0 3.5 3.0 2.5 IIN (A) 2.0 1.5 1.0 0.5 0.0 0 4 8 12 16 20 24 28 32 36 INPUT VOLTAGE, VI (V) 8-1238 (C) 8 7 6 5 IIN (A) 4 3 2 1 0 0 4 8 12 16 20 24 28 32 36 INPUT VOLTAGE, VI (V) 8-1239 (C) Figure 1. Typical JC050B Input Characteristics at Room Temperature, IO = Full Load Figure 3. Typical JC100B Input Characteristics at Room Temperature, IO = Full Load 6.0 5.0 4.0 3.0 2.0 VOUT (V) 0 4 8 12 16 20 24 28 32 36 IIN (A) 14 12 10 8 6 4 1.0 0.0 INPUT VOLTAGE, VI (V) 8-1238 (C).b 2 0 0 1 2 3 4 5 6 7 OUTPUT CURRENT, IO (A) 8-1240 (C) Figure 2. Typical JC075B Input Characteristics at Room Temperature, IO = Full Load Figure 4. Typical JC050B Output Characteristics at Room Temperature, VIN = 28 V Tyco Electronics Corp. 5 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Data Sheet October 1997 Characteristic Curves (continued) 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 9 OUTPUT CURRENT, IO (A) 8-1240 (C).a 86 85 84 18 V 28 V 36 V 83 EFF (%) 82 81 80 79 78 77 0 0.7 1.4 2.1 2.8 3.5 4.2 VOUT (V) OUTPUT CURRENT, IO (A) 8-1242 (C).a Figure 5. Typical JC075B Output Characteristics at Room Temperature, VIN = 28 V 14 12 10 8 VOUT (V) 6 4 2 0 0 1 2 3 4 5 6 7 8 9 10 OUTPUT CURRENT, IO (A) 8-1241 (C) Figure 7. Typical JC050B Converter Efficiency vs. Output Current at Room Temperature 86 84 82 EFF (%) 80 78 76 74 72 70 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 18 V 28 V 36 V OUTPUT CURRENT, IO (A) 8-1243 (C).a Figure 6. Typical JC100B Output Characteristics at Room Temperature, VIN = 28 V Figure 8. Typical JC075B Converter Efficiency vs. Output Current at Room Temperature 6 Tyco Electronics Corp. Data Sheet October 1997 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Characteristic Curves (continued) Test Configurations TO OSCILLOSCOPE 86 85 84 83 EFF (%) 82 81 80 79 78 77 0 1 2 3 4 5 6 7 8 18 V 28 V 36 V BATTERY LTEST 12 H CS 220 F ESR < 0.1 @ 20 C, 100 kHz CURRENT PROBE VI(+) 33 F ESR < 0.7 @ 100 kHz VI(-) 8-203 (C).l Note:Measure input reflected-ripple current with a simulated source inductance (LTEST) of 12 H. Capacitor CS offsets possible battery impedance. Measure current as shown above. OUTPUT CURRENT, IO (A) 8-1243 (C).b Figure 11. Input Reflected-Ripple Test Setup Figure 9. Typical JC100B Converter Efficiency vs. Output Current at Room Temperature VO(+) COPPER STRIP REMOTE ON/OFF VOLTAGE, VON/OFF (V) (5 V/div) 1.0 F VO(-) 10 F SCOPE RESISTIVE LOAD 8-513 (C).d 0V OUTPUT VOLTAGE, VO (V) (5 V/div) Note:Use a 1.0 F ceramic capacitor and a 10 F aluminum or tantalum capacitor. Scope measurement should be made using a BNC socket. Position the load between 51 mm and 7 6mm ( 2in .an d 3in.) from the module. Figure 12. Peak-to-Peak Output Noise Measurement Test Setup 0V TIME, t (5 ms/div) 8-1266 (C) Figure 10.Typical Start-Up from Remote On/Off JCxxxB1; IO = Full Load Tyco Electronics Corp. 7 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Data Sheet October 1997 Test Configurations (continued) SENSE(+) Electrical Descriptions Current Limit CONTACT AND DISTRIBUTION LOSSES VI (+) II SUPPLY VI (-) CONTACT RESISTANCE VO(+) IO LOAD VO(-) SENSE(-) 8-749 (C) 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. 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. [Vo(+) - Vo(-)]Io = ------------------------------------------ x 100 [Vi(+) - Vi(-)]Ii Figure 13. Output Voltage and Efficiency Measurement Test Setup Feature Descriptions 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 14). A logic low is Von/off = 0 V to 1.2V. 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 V on/off = 15 V is 50 A. If not using the remote on/off feature, do one of the following: Design Considerations Input Source Impedance 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 Figure 11, a 33 F electrolytic capacitor (ESR < 0.7 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. 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., UL-1950, CSA 22.2-950, and EN60950. For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), the input must meet SELV requirements. If the input meets extra-low voltage (ELV) requirements, then the converter's output is considered ELV. The input to these units is to be provided with a maximum 20 A normal-blow fuse in the ungrounded lead. For negative logic, short ON/OFF pin to VI(-) For positive logic, leave ON/OFF pin open. 8 Tyco Electronics Corp. Data Sheet October 1997 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W 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. With an external resistor between the TRIM and SENSE(-) pins (Radj-down), the output voltage set point (Vo, adj) decreases (see Figure 16). The following equation determines the required external-resistor value to obtain a percentage output voltage change of %. 100 Radj-down = --------- - 2 k % 8-720 (C).c Feature Descriptions (continued) Remote On/Off (continued) Ion/off + Von/off - ON/OFF SENSE(+) VO(+) LOAD VI(+) VI(-) VO(-) SENSE(-) The test results for this configuration are displayed in Figure 17. 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 18). The following equation determines the required external-resistor value to obtain a percentage output voltage change of %. VO ( 100 + % ) ( 100 + 2% ) Radj-up = ------------------------------------- - --------------------------------- k - 1.225% % The test results for this configuration are displayed in Figure 19. The voltage between the VO(+) and VO(-) terminals must not exceed 5.9 V. This limit includes any increase in voltage due to remote-sense compensation and output voltage set-point adjustment (trim). See Figure 15. If not using the trim feature, leave the TRIM pin open. Figure 14. Remote On/Off Implementation 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(-)] 1.2 V The voltage between the VO(+) and VO(-) terminals must not exceed 5.9 V. This limit includes any increase in voltage due to remote-sense compensation and output voltage set-point adjustment (trim), see Figure 15. 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. VI (+) SENSE(+) SENSE(-) VI(+) SUPPLY II VI(-) CONTACT RESISTANCE VO(-) CONTACT AND DISTRIBUTION LOSSES VO(+) IO LOAD VO (+) SENSE(+) TRIM Radj-down SENSE(-) VO(-) 8-748 (C).c ON/OFF CASE VI (-) 8-651 (C).h RLOAD Figure 15. Effective Circuit Configuration for Single-Module Remote-Sense Operation Figure 16. Circuit Configuration to Decrease Output Voltage Tyco Electronics Corp. 9 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Data Sheet October 1997 Feature Descriptions (continued) Output Voltage Set-Point Adjustment (Trim) (continued) 1M ADJUSTMENT RESISTOR VALUE () ADJUSTMENT RESISTOR VALUE () 10M 1M 100k 100k 10k 10k 0 2 4 6 8 10 8-880a % CHANGE IN OUTPUT VOLTAGE (%) 1k Figure 19. Resistor Selection for Increased Output Voltage 100 0 10 20 30 40 Output Overvoltage Clamp The ouput 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. % CHANGE IN OUTPUT VOLTAGE (%) 8-879 (C) Figure 17. Resistor Selection for Decreased Output Voltage VI(+) ON/OFF CASE VI(-) VO(+) SENSE(+) Radj-up TRIM SENSE(-) VO(-) 8-715 (C).d Overtermperature Protection (Shutdown) RLOAD The 100 W 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. 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,a nd radiation to the surrounding environment. Proper cooling can be verified by measuring the case temperature. Peak temperature (Tc) occurs at the position indicated in Figu re20. Figure 18. Circuit Configuration to Increase Output Voltage 10 Tyco Electronics Corp. Data Sheet October 1997 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Example What is the minimum airflow necessary for a JC100B operating at nominal line, an output current of 8.5 A, and a maximum ambient temperature of 40 C? MEASURE CASE TEMPERATURE HERE Thermal Considerations (continued) Introduction (continued) 38.0 (1.50) Solution Given: VI = 28 V IO = 8.5 A TA = 40 C Determine PD (Use Figure 24.): 7.6 (0.3) VI(+) ON/OFF VO(+) + SEN TRIM PD = 20 W Determine airflow (v) (Use Figure 21.): v = 2.5 m/s (500 ft./min.) 35 POWER DISSIPATION, PD (W) 30 25 20 15 10 5 0 0 10 20 30 40 50 60 70 80 90 100 LOCAL AMBIENT TEMPERATURE, T (C) A 8-1150 (C).a CASE VI(-) - SEN VO(-) 8-716 (C).f Note: Top view, pin locations are for reference. Measurements shown in millimeters and (inches). Figure 20. Case Temperature Measurement Location The temperature at this location 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 100 C, you can limit this temperature to a lower value for extremely high reliability. For additional information on these modules, refer to the Thermal Management JC-, JFC-, JW-, and JFW-Series 50 W to 150 W Board-Mounted Power Modules Technical Note (TN97-008EPS). 4.0 m/s (800 ft./min.) 3.5 m/s (700 ft./min.) 3.0 m/s (600 ft./min.) 2.5 m/s(500 ft./min.) 2.0 m/s(400 ft./min.) 1.5 m/s (300 ft./min.) 1.0 m/s (200 ft./min.) 0.5 m/s (100 ft./min.) 0.1 m/s (NAT. CONV.) (20 ft./min.) Figure 21. Forced Convection Power Derating with No Heat Sink; Either Orientation Heat Transfer Without Heat Sinks POWER DISSIPATION, PD (W) 12 10 8 6 4 2 0 0.0 VI = 18 VI = 27 VI = 36 Increasing airflow over the module enhances the heat transfer via convection. Figure 21 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 4 m/s (800 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 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 Figur e21 is shown in the following example. 0.6 1.2 1.8 2.4 3.0 3.6 4.2 OUTPUT CURRENT, IO (A) 8-1249 Figure 22. JC050B Power Dissipation vs. Output Current 11 Tyco Electronics Corp. JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Data Sheet October 1997 Thermal considerations (continued) Heat Transfer Without Heat Sinks (continued) 20 18 16 14 12 10 8 6 4 2 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 OUTPUT CURRENT, IO (A) 8-1494 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.). Thermal derating with heat sinks is expressed by using the overall thermal resistance of the module. Total module thermal resistance (ca) is defined as the maximum case temperature rise (TC, max) divided by the module power dissipation (PD): ) ca = TC, max = ( TC - TA -----------------------------------------PD PD The location to measure case temperature (TC) is shown in Figure 20. Case-to-ambient thermal resistance vs. airflow is shown, for various heat sink configurations and heights, in Figur e25. These curves were obtained by experimental testing of heat sinks, which are offered in the product catalog. 8 CASE-TO-AMBIENT THERMAL RESISTANCE, RCA (C/W) POWER DISSIPATION, PD (W) VI = 36 V VI = 24 V VI = 18 V Figure 23. JC075B Power Dissipation vs. Output Current 25 POWER DISSIPATION, PD (W) 20 7 6 5 4 3 2 1 0 0 0.5 (100) 1.0 (200) 1.5 (300) 2.0 (400) 2.5 3.0 (500) (600) 1 1/2 IN HEAT SINK 1 IN HEAT SINK 1/2 IN HEAT SINK 1/4 IN HEAT SINK NO HEAT SINK 15 VI = 18 VI = 28 VI = 36 10 5 0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 OUTPUT CURRENT, IO (A) 8-1250 AIR VELOCITY MEASURED IN m/s (ft./min.) 8-1153 Figure 24. JC100B Power Dissipation vs. Output Current Figure 25. 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 Figur e25 had a thermal-conductive dry pad between the case and the heat sink to minimize contact resistance. The use of Figure 25 is shown in the following example 12 Tyco Electronics Corp. Data Sheet October 1997 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W 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 (cs) and sink-to-ambient (sa) shown below (Figure 26). Thermal considerations (continued) Heat Transfer with Heat Sinks (continued) Example If an 85 C case temperature is desired, what is the minimum airflow necessary? Assume the JC100B module is operating at nominal line and an output current of 8.5 A, maximum ambient air temperature of 40 C, and the heat sink is 0.5 in. Solution Given: VI = 28 V IO = 8.5 A TA = 40 C TC = 85 C Heat sink = 0.5 in. Determine PD by using Figure 24: PD = 20 W Then solve the following equation: ) ca = ( TC - TA ----------------------PD PD TC cs TS sa TA 8-1304 Figure 26. Resistance from Case-to-Sink and Sink-to-Ambient For a managed interface using thermal grease or foils, a value of cs = 0.1 C/W to 0.3 C/W is typical. The solution for heat sink resistance is: ) sa = ( TC - TA - - cs -----------------------PD ca = ( 85 - 40 ) ----------------------20 ca = 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. 2.3 C/W Use Figure 25 to determine air velocity for the0.5 inch heat sink. The minimum airflow necessary for the JC100B module is 1.7 m/s (340 ft./min.). Layout Considerations Copper paths must not be routed beneath the power module mounting inserts. Tyco Electronics Corp. 13 JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Data Sheet October 1997 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 61.0 (2.40) MAX Side View SIDE LABELS* 13.08 0.5 (0.515 0.020) 5.1 (0.20) MIN 1.02 (0.040) DIA SOLDER-PLATED BRASS, 7 PLCS 2.06 (0.081) DIA SOLDER-PLATED BRASS, 2 PLACES-(OUTPUT AND +OUTPUT) Bottom View 12.7 (0.50) 5.1 (0.20) VI (-) 10.16 (0.400) 50.8 (2.00) 25.40 (1.000) CASE -SEN TRIM ON/OFF VI (+) +SEN VO (+) VO (-) MOUNTING INSERTS M3 x 0.5 THROUGH, 4 PLACES 10.16 (0.400) 17.78 (0.700) 25.40 (1.000) 35.56 (1.400) 35.56 (1.400) 48.26 (1.900) 4.8 (0.19) 48.3 (1.90) 8-1190 * Side labels include Tyco name, product designation, safety agency markings, input/output voltage and current ratings, and bar code. 14 Tyco Electronics Corp. JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Data Sheet October 1997 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 (+) 35.56 (1.400) 50.8 (2.00) 25.40 (1.000) 10.16 (0.400) VI (-) 5.1 (0.20) 12.7 (0.50) ON/OFF VO (+) +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 VO (-) MOUNTING INSERTS MODULE OUTLINE 8-1190 Ordering Information Input Voltage 28 V 28 V 28 V 28 V 28 V 28 V Output Voltage 12.0 V 12.0 V 12.0 V 12.0 V 12.0 V 12.0 V Output Power 50 W 75 W 100 W 50 W 75 W 100 W Remote On/ Off Logic negative negative negative positive positive positive Device Code JC050B1 JC075B1 JC100B1 JC050B JC075B JC100B Comcode 107201667 107310005 107201683 107361479 107477184 107309940 Option Features Optional features can be ordered using the suffixes shown in Table 4. The suffixes follow the last letter of the device code and are placed in descending order. For example, the device codes for a JC100B module with the following options are shown below: Positive logic Negative logic JC100B JC100B1 Table 4. Module Options and Suffixes Option Short lead 2.79 mm (0.110 in.) Short lead 3.68 mm (0.145 in.) Negative remote on/off logic Positive remote on/off logic Suffix 8 6 1 -- Positive logic and 2.79 mm leads JC100B8 Negative logic and 2.79 mm leadsJC100B81 Negative logic and 3.68 mm leadsJC100B61 15 Tyco Electronics Corp. JC050B, JC075B, JC100B Power Modules: dc-dc Converters; 18 Vdc to 36 Vdc Input, 12 Vdc Output; 50 W to 100 W Data Sheet October 1997 Europe, Middle-East and Africa Headquarters Tyco Electronics (UK) Ltd Tel: +44 (0) 1344 469 300, Fax: +44 (0) 1344 469 301 Central America-Latin America Headquarters Tyco Electronics Power Systems Tel: +54 11 4316 2866, Fax: +54 11 4312 9508 Asia-Pacific Headquarters Tyco Electronics Singapore Pte Ltd Tel: +65 482 0311, Fax: 65 480 9299 World Wide Headquarters Tyco Electronics Power Systems, Inc. 3000 Skyline Drive, Mesquite, TX 75149, USA +1-800-526-7819 FAX: +1-888-315-5182 (Outside U.S.A.: +1-972-284-2626, FAX: +1-972-284-2900) www.power.tycoelectronics.com e-mail: techsupport1@tycoelectronics.com Tyco Electronics Corporation reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information. (c) 2001 Tyco Electronics Power Systems, Inc. (Mesquite, Texas) All International Rights Reserved. Printed in U.S.A. October 1997 DS97-277EPS (Replaces DS95-045EPS) Printed on Recycled Paper |
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