Data Sheet October 5, 2009 NaOSTM NXA025 SIP Non-isolated Power Modules: 10Vdc – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A Output Current RoHS Compliant Features Compliant to RoHS EU Directive 2002/95/EC (-Z versions) Compliant to ROHS EU Directive 2002/95/EC with lead solder exemption (non-Z versions) Delivers up to 25A output current High efficiency – 93% at 3.3V full load Small size and low profile: 31.7 mm x 50.8 mm x 8.50 mm (1.25 in x 2.00 in x 0.335 in) Applications Distributed power architectures Intermediate bus voltage applications Telecommunications equipment Servers and storage applications Networking equipment Enterprise Networks Latest generation IC’s (DSP, FPGA, ASIC) and Microprocessor powered applications Low output ripple and noise Constant switching frequency (500 kHz) Output voltage programmable from 0.8 Vdc to 5.5Vdc via external resistor Remote On/Off Remote Sense Parallel operation with current sharing (-P option) Output voltage sequencing (multiple modules) Output overvoltage protection Overtemperature protection Output overcurrent protection (non-latching) Wide operating temperature range (-40°C to 85°C) UL* 60950-1Recognized, CSA C22.2 No. 60950-1‡ 03 Certified, and VDE 0805:2001-12 (EN60950-1) Licensed ISO** 9001 and ISO 14001 certified manufacturing facilities † Description The NXA025 series SIP (single-in line package) power modules are non-isolated dc-dc converters that can deliver up to 25A of output current with full load efficiency of 93% at 3.3Vdc output voltage. These modules provide a precisely regulated output voltage from 0.8Vdc to 5.5Vdc, programmable via an external resistor. The open-frame construction and small footprint enable designers to develop cost- and space-efficient solutions. Standard features include remote On/Off, adjustable output voltage, remote sense, output voltage sequencing of multiple modules, over current, over voltage, and over temperature protection. * UL is a registered trademark of Underwriters Laboratories, Inc. † CSA is a registered trademark of Canadian Standards Association. VDE is a trademark of Verband Deutscher Elektrotechniker e.V. ** ISO is a registered trademark of the International Organization of Standards ‡ Document No: DS05-034 ver 1.53 PDF name: nxa025_sip_ds.pdf Data Sheet October 5, 2009 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current 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 the device reliability. Parameter Device Symbol Min Max Unit All VIN -0.3 14 Vdc All TA -40 85 °C All Tstg -55 125 °C Input Voltage Continuous Operating Ambient Temperature (see Thermal Considerations section) Storage Temperature Electrical Specifications Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. Parameter Device Symbol Min Typ Max Unit Operating Input Voltage All VIN 10.0 12.0 14.0 Vdc Maximum Input Current All IIN,max 14 Adc Inrush Transient All It 2 1 As Input Reflected Ripple Current, peak-to-peak (5Hz to 20MHz, 1μH source impedance; VIN, min to VIN, max, IO= IOmax ; See Test configuration section) All 60 Input Ripple Rejection (120Hz) All 50 (VIN=10.0V to 14.0V, IO=IO, max ) 2 mAp-p dB CAUTION: This power module is not internally fused. An input line fuse must always be used. This power module can be used in a wide variety of applications, ranging from simple standalone operation to being part of a complex 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 fastacting fuse with a maximum rating of 30A (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 sheet for further information. LINEAGE POWER 2 Data Sheet October 5, 2009 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Electrical Specifications (continued) Parameter Output Voltage Set-point Device Symbol Min Typ Max Unit All VO, set -1.2 ⎯ +1.2 % VO, set All VO, set -3.0 ⎯ +3.0 % VO, set All VO 0.7887 5.5 Vdc (VIN=VN, min, IO=IO, max, TA=25°C) Output Voltage (Over all operating input voltage, resistive load, and temperature conditions until end of life) Adjustment Range Selected by an external resistor Output Regulation Line (VIN=VIN, min to VIN, max) All ⎯ 0.01 0.1 % VO, set Load (IO=IO, min to IO, max) All ⎯ 0.1 0.2 % VO, set Temperature (Tref=TA, min to TA, max) All ⎯ 0.5 1 % VO, set RMS (5Hz to 20MHz bandwidth) All ⎯ 5 15 mVrms Peak-to-Peak (5Hz to 20MHz bandwidth) All ⎯ 15 50 mVpk-pk μF Output Ripple and Noise on nominal output (VIN=VIN, nom and IO=IO, min to IO, max Cout = 2 × 0.47μF ceramic capacitors) External Capacitance ESR ≥ 1 mΩ All CO, max ⎯ ⎯ 1000 ⎯ 10,000 μF 25 Adc All CO, max ⎯ Output Current All Io 0 Output Current Limit Inception (Hiccup Mode ) All IO, lim ⎯ 125 150 % Io Output Short-Circuit Current All IO, s/c ⎯ 1 ⎯ Adc ESR ≥ 10 mΩ (VO≤250mV) ( Hiccup Mode ) Efficiency VIN= VIN, nom, TA=25°C IO=IO, max , VO= VO,set VO,set = 0.8Vdc η 79.0 % VO, set = 1.2Vdc η 84.7 % VO,set = 1.5Vdc η 87.3 % VO,set = 1.8Vdc η 88.9 % VO,set = 2.0Vdc η 89.7 % VO,set = 2.5Vdc η 91.4 % VO,set = 3.3Vdc η 93.1 % VO,set = 5.5Vdc η 95.1 % All fsw ⎯ All Vpk ⎯ Settling Time (Vo<10% peak deviation) All ts ⎯ (dIo/dt=5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ All ts ⎯ Switching Frequency 500 ⎯ kHz 150 mV ⎯ μs 150 mV ⎯ μs Dynamic Load Response (dIo/dt=5A/μs; VIN = VIN, nom; TA=25°C) Load Change from Io= 50% to 100% of Io,max; No external output capacitors Peak Deviation 25 Load Change from Io= 100% to 50%of Io,max: No external output capacitors Peak Deviation Settling Time (Vo<10% peak deviation) LINEAGE POWER 25 3 Data Sheet October 5, 2009 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current General Specifications Parameter Min Calculated MTBF (IO=80% of IO, max, TA=25°C) Typ Max Unit 2,150,000 ⎯ Weight Hours ⎯ 15.5 (0.55) 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 Device Symbol Min Typ Max Unit SEQ/ENA Signal Interface (VIN=VIN, min to VIN, max ; open collector or equivalent, Signal referenced to GND) Logic High (SEQ/ENA pin open – Module Off) SEQ/ENA Current All ISEQ/ENA 0.5 ⎯ 2.33 mA SEQ/ENA Voltage: All VSEQ/ENA 3.5 ⎯ 14 V All ISEQ/ENA ⎯ ⎯ 200 μA Logic Low (Module ON) SEQ/ENA Current: All VSEQ/ENA ⎯ ⎯ 1.2 V Turn-On Delay and Rise Times All Tdelay ― 1 ― msec (IO=IO, max , Vo to within ±1% of steady state) All Trise ― 5 msec 0.1 ― 0.5 % VO, set 6.0 6.3 V 9.9 V SEQ/ENA Voltage: Output voltage overshoot – Startup o IO=80% of IO, max; VIN = 12Vdc, TA = 25 C Ouptut Overvoltage Protection (Latching) All 5.7 Input Undervoltage Lockout Turn-on Threshold All Turn-off Threshold All Remote Sense Range Overtemperature Protection All 8.1 Tref V ― ― 0.5 V ⎯ 125 ⎯ °C ⎯ 10 (See Thermal Consideration section) Forced Load Share Accuracy Number of units in Parallel LINEAGE POWER All % Io 3 4 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Data Sheet October 5, 2009 Characteristic Curves The following figures provide typical characteristics for the NXA025A0X at 25ºC. 88% 94% 87% 93% EFFICIENCY, η (%) EFFICIENCY, η (%) 86% 85% 84% Vin=13.2V 83% Vin=12.0V 82% Vin=10.8V 81% 80% 0 5 10 15 20 92% 91% Vin=13.2V 90% Vin=12.0V 89% Vin=10.8V 88% 25 0 OUTPUT CURRENT, IO (A) 95% 94% 89% EFFICIENCY, η (%) EFFICIENCY, η (%) 91% 88% 87% Vin=13.2V Vin=12.0V Vin=10.8V 84% 83% 20 25 93% 92% Vin=13.2V 91% Vin=12.0V 90% Vin=10.8V 89% 88% 0 5 10 15 20 25 0 OUTPUT CURRENT, IO (A) 5 10 15 20 25 OUTPUT CURRENT, IO (A) Figure 2. Converter Efficiency versus Output Current (Vout = 1.5Vdc). Figure 5. Converter Efficiency versus Output Current (Vout = 3.3Vdc). 92% 97% 91% 96% 95% 90% EFFICIENCY, η (%) EFFICIENCY, η (%) 15 Figure 4. Converter Efficiency versus Output Current (Vout = 2.5Vdc). 90% 85% 10 OUTPUT CURRENT, IO (A) Figure 1. Converter Efficiency versus Output Current (Vout = 1.2Vdc). 86% 5 89% 88% Vin=13.2V 87% Vin=12.0V 86% Vin=10.8V 85% 0 5 10 15 20 25 OUTPUT CURRENT, IO (A) Figure 3. Converter Efficiency versus Output Current (Vout = 1.8Vdc). LINEAGE POWER 94% Vin=13.2V 93% Vin=12.0V 92% Vin=10.8V 91% 90% 89% 0 5 10 15 20 25 OUTPUT CURRENT, IO (A) Figure 6. Converter Efficiency versus Output Current (Vout = 5.0Vdc). 5 Data Sheet October 5, 2009 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Characteristic Curves (continued) LINEAGE POWER VO (V) (50mV/div) IO (A) (5A/div) OUTPUT CURRENT, OUTPUT VOLTAGE On/Off VOLTAGE TIME, t (5μs/div) Figure 9. Transient Response to Dynamic Load Change from 50% to 100% of full load (Vo = 3.3Vdc). VIN (V) (2V/div) Vo (V) (1V/div) TIME, t (0.5ms/div) Figure 11. Typical Start-Up with application of Vin (Vo = 3.3Vdc). OUTPUT VOLTAGE OUTPUT CURRENT OUTPUT VOLTAGE IO (A) (5A/div) VO (V) (50mV/div) Figure 8. Typical Output Ripple and Noise (Vin = 12V dc, Vo = 1.2Vdc, Cout = 2x 0.47uF ceramic capacitor). OUTPUT VOLTAGE, INPUT VOLTAGE VO (V) (20mV/div) OUTPUT VOLTAGE TIME, t (1μs/div) TIME, t (5 μs/div) Figure 10. Transient Response to Dynamic Load Change from 100% to 50% of full load (Vo = 3.3Vdc). VOn/off (V) (2V/div) TIME, t (1μs/div) Figure 7. Typical Output Ripple and Noise (Vin = 12V dc, Vo = 3.3 Vdc, Cout = 2x 0.47uF ceramic capacitor). VOV) (1V/div) VO (V) (20mV/div) OUTPUT VOLTAGE The following figures provide typical characteristics for the NXA025A0X at 25ºC. TIME, t (0.5ms/div) Figure 12. Typical Start-Up Using Enable (Vo = 3.3Vdc). 6 Data Sheet October 5, 2009 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Characteristic Curves (continued) Module #2 VO (V) (1V/div) Module # 1 VO(V) (1V/div) The following figures provide typical characteristics for the NXA025A0X at 25oC. TIME, t (1ms/div) VO(V) (1V/div) Module #2 Module # 1 VO (V) (1V/div) Figure 13. Synchronized Start-up of Output Voltage when SEQ/ENA pins are tied together (Module #1 = 1.5Vdc, Module #2 = 3.3Vdc). TIME, t (1ms/div) Figure 14. Synchronized Shut-down of Output Voltage when SEQ/ENA pins are tied together (Module #1 = 1.5Vdc, Module #2 = 3.3Vdc). LINEAGE POWER 7 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Data Sheet October 5, 2009 Characteristic Curves (continued) The following figures provide typical thermal derating curves for NXA025A0X (Figures 19 and 20 show derating curves with base plate). 30 30 OUTPUT CURRENT, Io (A) OUTPUT CURRENT, Io (A) 25 100LFM 20 200LFM 15 300LFM 10 400LFM 5 0 20 30 40 50 60 70 80 25 100LFM 20 200LFM 15 300LFM 10 400LFM 5 0 20 O 50 60 70 80 AMBIENT TEMPERATURE, TA C Figure 15. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 12Vdc, Vo=1.2Vdc). Figure 18. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 12Vdc, Vo=5.0 Vdc). 30 25 100LFM 20 200LFM 15 300LFM 10 400LFM 5 0 20 30 40 50 60 70 80 OUTPUT CURRENT, Io (A) 30 OUTPUT CURRENT, Io (A) 40 O AMBIENT TEMPERATURE, TA C 25 20 15 10 100 LFM 5 200 LFM 0 20 O 30 40 50 60 70 80 O AMBIENT TEMPERATURE, TA C AMBIENT TEMPERATURE, TA C Figure 16. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 12Vdc, Vo=1.8 Vdc). Figure 19. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 12Vdc, Vo=3.3 Vdc) with baseplate. 30 30 25 100LFM 20 200LFM 15 300LFM 10 400LFM 5 0 20 30 40 50 60 70 O AMBIENT TEMPERATURE, TA C Figure 17. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 12Vdc, Vo=3.3 Vdc). LINEAGE POWER 80 OUTPUT CURRENT, Io (A) OUTPUT CURRENT, Io (A) 30 25 20 100 LFM 15 200 LFM 10 300 LFM 5 400 LFM 0 20 30 40 50 60 70 80 O AMBIENT TEMPERATURE, TA C Figure 20. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 12Vdc, Vo=5.0 Vdc) with baseplate. 8 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Data Sheet October 5, 2009 Test Configurations Typical Application Circuit CIN LTEST Vin Rx VIN(+) 1μH Share 4.99k Min 150μF Vout SEQ/ENA Vout Vout Cout NOTE: Measure input reflected ripple current with a simulated source inductance (LTEST) of 1μH. Capacitor CS offsets possible battery impedance. Measure current as shown above. GND SEN- Qx COM GND E.S.R.<0.1Ω @ 20°C 100kHz SEN+ Dx CIN 220μF Vin Share GND CS Rtrim BATTERY VIN CURRENT PROBE TO OSCILLOSCOPE 1uF Figure 21. Input Reflected Ripple Current Test Setup. Figure 24. Application Schematic COPPER STRIP VO (+) RESISTIVE LOAD 1uF . 10uF Input Source Impedance SCOPE COM GROUND PLANE NOTE: All voltage measurements to be taken at the module terminals, as shown above. If sockets are used then Kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance. Figure 22. Output Ripple and Noise Test Setup. Rdistribution Rcontact Rcontact VIN(+) Design Considerations Rdistribution VO The power module should be connected to a low ac-impedance source. Highly inductive source impedance can affect the stability of the power module. The input capacitor CIN should be located equal distance from the two input pins of the module. CIN is recommended to be 150μF minimum. The ripple voltage is 50mV RMS at 1MHz and the capacitor should be chosen with an ESR and an RMS Current Rating for this amount of ripple voltage. When using multiple modules in parallel, a small inductor (0.2 –0.5μH) is recommended at the input of each module to prevent interaction between modules. Consult the factory for further application guidelines. Safety Considerations Rdistribution RLOAD VO VIN Rcontact Rcontact COM Rdistribution COM NOTE: All voltage measurements to be taken at the module terminals, as shown above. If sockets are used then Kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance. Figure 23. Output Voltage and Efficiency Test Setup. VO. IO Efficiency η = LINEAGE POWER VIN. IIN x 100 % For safety agency approval the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standards, i.e., UL 60950-1, CSA C22.2 No. 60950-1-03, and VDE 0850:2001-12 (EN60950-1) Licensed. For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), the input must meet SELV requirements. 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 of 30 A fast-acting fuse in the ungrounded lead. 9 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Data Sheet October 5, 2009 Feature Description Remote On/Off using SEQ/ENA Pin The NXA025A0X SIP power modules feature an SEQ/ENA pin for remote On/Off operation. If not using the remote On/Off pin, leave the pin open (module will be on). The SEQ/ENA signal (VSEQ/ENA) is referenced to ground. Circuit configuration for remote On/Off operation of the module using SEQ/ENA pin is shown in Figure 25. During Logic High on the SEQ/ENA pin (transistor Qx is OFF), the module remains OFF. The external resistor Rx should be chosen to maintain 3.5V minimum on the SEQ/ENA pin to insure that the unit is OFF when transistor Qx is in the OFF state. During Logic-Low when Qx is turned ON, the module is turned ON. Note that the external diode is required to make sure the internal thermal shutdown (THERMAl_SD) and undervoltage (UVLO) circuits are not disabled when Qx is turned ON voltage at the point of load, connect SENSE (+) to Vo(+) and Sense (-) to ground. The amount of power delivered by the module is defined as the voltage at the output terminals multiplied by the output current. When using the remote sense, the output voltage of the module can be increased, which at the same output current would increase the power output of the module. Ensure that the maximum output power of the module remains at or below the maximum rated power (Po,max = Io,max x Vo,max). Figure 26. Effective Circuit Configuration for Remote sense operation Overcurrent Protection THERMAL_SD VIN UVLO Rx 4.99k Enable SEQ/ENA Pin Dx R1 1k Input Undervoltage Lockout R2 Qx 4.99k Figure 25. Remote On/Off Implementation. The SEQ/ENA pin can also be used to synchronize the output voltage start-up and shutdown of multiple modules in parallel. By connecting SEQ/ENA pins of multiple modules, the output start-up can be synchronized (please refer to characterization curves). When SEQ/ENA pins are connected together, all modules will shutdown if any one of the modules gets disabled due to undervoltage lockout or overtemperature protection. Remote Sense Remote sense feature minimizes the effects of distribution losses by regulating the voltage at the remote sense pins. The voltage between the remote sense pins and the output terminals must not exceed the remote sense range given in the Feature Specification table, i.e.: [Vo(+) – Vo(GND)] –[SENSE(+) – SENSE(-)] < 0.5V Remote sense configuration is shown in Figure 26. If not using the remote sense feature to regulate the output LINEAGE POWER To provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting circuitry and can endure current limiting continuously. At the point of current-limit inception, the unit enters hiccup mode. The unit operates normally once the output current is brought back into its specified range. The average output current during hiccup is 10% IO, max. At input voltages below the input undervoltage lockout limit, module operation is disabled. The module will begin to operate at an input voltage above the undervoltage lockout turn-on threshold. Overtemperature Protection To provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. The unit will shutdown if the thermal reference point Tref, exceeds 125oC (typical), but the thermal shutdown is not intended as a guarantee that the unit will survive temperatures beyond its rating. The module will automatically restarts after it cools down. Output Voltage Programming The output voltage of the NXA025A0X can be programmed to any voltage from 0.8Vdc to 5.5Vdc by inserting a series resistor (shown as Rtrim in figure 27) in the Sense(+) pin of the module. Without an external resistor in the Sense(+) pin (Sense (+) pin is shorted to Vo(+)), the output voltage of the module will be 0.7887V. With Sense(+) not connected to Vo(+), the output of the module will reach overvoltage shutdown. A 1μF multilayer ceramic capacitor is required from Rtrim to Sense(-) pin to minimize noise. To calculate the value of the 10 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Data Sheet October 5, 2009 Feature Descriptions (continued) Output Voltage Programming (continued) resistor Rtrim for a particular desired voltage Vo, use the following equation: ⎡ Vo ⎤ Rtrim = 775 * ⎢ − 1⎥ Ω 0 . 7887 ⎣ ⎦ Where Vo is the desired output voltage and Rtrim is the external resistor in ohms For example, to program the output voltage of the NXA025A0X-S module to 2.5Vdc, Rtrim is calculated as follows: ⎡ 2.5 ⎤ Rtrim = 775 * ⎢ − 1⎥ ⎣ 0.7887 ⎦ Rtrim = 1682Ω VIN(+) VO Rtrim Share 1µF For additional power requirements, the power module can be configured for parallel operation with forced load sharing (See Figure 28). Good layout techniques should be observed for noise immunity when using multiple units in parallel. To implement forced load sharing, the following connections should be made: • The share pins of all units in parallel must be connected together. The path of these connections should be as direct as possible. • All remote-sense pins should be connected to the power bus at the same point, i.e., connect all the SENSE(+) pins to the (+) side of the bus and all the SENSE(-) pins to the GROUND of the power bus at the same point. Close proximity and directness are necessary for good noise immunity The share bus is not designed for redundant operation and the system will be non-functional upon failure of one of the unit when multiple units are in parallel. The maximum number of modules tied to share bus is 3. When not using the parallel feature, leave the share pin open. Sense+ ENA Forced Load sharing (Parallel Operation) RLOAD SenseCOM COM Figure 27. Circuit Configuration for Programming Output voltage Table 1 provides Rtrim values required for most common output voltages. To achieve the output voltage tolerance as specified in the electrical specifications over all operating input voltage, resistive load and temperature conditions, use 0.1% thick metal film resistor. Table 1 Vo,set (V) Rtrim Ω 0.8 11 1.0 208 1.2 404 1.5 699 1.8 994 2.0 1190 2.5 1682 3.3 2468 5.0 4138 Overvoltage Shutdown Open LINEAGE POWER Figure 28. Circuit Configuration for modules in parallel. 11 Data Sheet October 5, 2009 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Thermal Considerations The power modules operate in a variety of thermal environments; however, sufficient cooling should be provided to help ensure reliable operation. Considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. A reduction in the operating temperature of the module will result in an increase in reliability. The thermal data presented here is based on physical measurements taken in a wind tunnel. The thermal reference point, Tref used in the specifications is shown in Figure 29. For reliable operation this temperature should not exceed 110oC. Please refer to the Application Note “Thermal Characterization Process For Open-Frame BoardMounted Power Modules” for a detailed discussion of thermal aspects including maximum device temperatures. Figure 29. Tref Temperature measurement location. Heat Transfer via Convection Increased airflow over the module enhances the heat transfer via convection. Derating figures showing the maximum output current that can be delivered by various module versus local ambient temperature (TA) for natural convection and up to 2m/s (400 ft./min) are shown in the respective Characteristics Curves section. Layout Considerations The input capacitors should be located equal distance from the two input pins of the module. Recommended layout is shown in the mechanical section. In addition to the input and output planes, a ground plane beneath the module is recommended. LINEAGE POWER 12 Data Sheet October 5, 2009 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Mechanical Outline Dimensions are in millimeters and (inches). Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated] x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.) Top View Side View Bottom View Pin # Function 1 Sen+ 2 Sen- 3 Vin 4 Ground 5 Vout 6 Vout 7 Ground 8 Ground 9 Vout 10 Vout 11 Ground 12 Vin 13 SEQ/ENA 14 SHARE LINEAGE POWER 13 Data Sheet October 5, 2009 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Recommended Pad Layout Dimensions are in millimeters and (inches). Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated] x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.) Layout Guidelines LINEAGE POWER 14 Data Sheet October 5, 2009 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Post solder Cleaning and Drying Considerations Post solder cleaning is usually the final circuit-board assembly process prior to electrical board testing. The result of inadequate 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 Board Mounted Power Modules: Soldering and Cleaning Application Note. Through-Hole Lead-Free Soldering Information The RoHS-compliant through-hole products use the SAC (Sn/Ag/Cu) Pb-free solder and RoHS-compliant components. They are designed to be processed through single or dual wave soldering machines. The pins have an RoHS-compliant finish that is compatible with both Pb and Pb-free wave soldering processes. A maximum preheat rate of 3°C/s is suggested. The wave preheat process should be such that the temperature of the power module board is kept below 210°C. For Pb solder, the recommended pot temperature is 260°C, while the Pb-free solder pot is 270°C max. Not all RoHS-compliant through-hole products can be processed with paste-through-hole Pb or Pb-free reflow process. If additional information is needed, please consult with your Lineage Power technical representative for more details. LINEAGE POWER 15 NaosTM NXA025 SIP Non-isolated Power Modules: 10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current Data Sheet October 5, 2009 Ordering Information Please contact your Lineage Power Sales Representative for pricing, availability and optional features. Table 2. Device Codes Product codes Input Voltage Output Voltage Output Current Efficiency 3.3V @ 25A Connector Type Comcodes NXA025A0X 10 – 14 Vdc 0.8Vdc – 5.5Vdc 25 A 93 % SIP 108975095 NXA025A0X-P 10 – 14 Vdc 0.8Vdc – 5.5Vdc 25 A 93 % SIP 108997565 NXA025A0XZ 10 – 14 Vdc 0.8Vdc – 5.5Vdc 25 A 93 % SIP CC109107166 NXA025A0X-PZ 10 – 14 Vdc 0.8Vdc – 5.5Vdc 25 A 93 % SIP CC109106754 NXA025A0X6Z 10 – 14 Vdc 0.8Vdc – 5.5Vdc 25 A 93 % SIP CC109145736 -Z refers to RoHS-compliant versions. Table 3. Device Options Option Suffix Short Pins 3.6 mm ± 0.25 mm [0.141 ± 0.010 in.] 6 Asia-Pacific Headquarters Tel: +65 6593 7211 World Wide Headquarters Lineage Power Corporation 601 Shiloh Road, Plano, TX 75074, USA +1-800-526-7819 (Outside U.S.A.: +1-972-244-9428) www.lineagepower.com e-mail: [email protected] Europe, Middle-East and Africa Headquarters Tel: +49 898 780 672 80 India Headquarters Tel: +91 80 28411633 Lineage Power 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. Lineage Power DC-DC products are protected under various patents. Information on these patents is available at www.lineagepower.com/patents. © 2009 Lineage Power Corporation, (Plano, Texas) All International Rights Reserved. LINEAGE POWER 16 Document No: DS05-034 ver 1.53 PDF name: nxa025_sip_ds.pdf