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data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10vdc ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current * 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: ds03-030 ver. 1.4 pdf name: NXA025_smt_ds.pdf 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 options baseplate version for heatsink attachment (-h suffix) through hole version (-l) paralleling with current sharing (-p) 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: 47.2 mm x 29.4 mm x 8.50 mm (1.86 in x 1.16 in x 0.335 in) low output ripple and noise constant switching frequency (500 khz) surface mount or through hole 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 (-40c to 85c) 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 smt (surface-mount technology) 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. their 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, active current sharing between parallel modules, output voltage sequencing of multiple modules, overcurrent, overvoltage, and overtemperature protection. rohs compliant www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 2 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 input voltage all v in -0.3 14 vdc continuous operating ambient temperature all t a -40 85 c (see thermal considerations section) storage temperature all t stg -55 125 c 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 v in 10.0 12.0 14.0 vdc maximum input current all i in,max 14 adc (v in =10.0v to 14.0v, i o =i o, max ) inrush transient all i 2 t 1 a 2 s input reflected ripple current, peak-to-peak (5hz to 20mhz, 1h source impedance; v in, min to v in, max, i o = i omax ; see test configuration section) all 60 map-p input ripple rejection (120hz) all 50 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 fast- acting 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. www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 3 electrical specifications (continued) parameter device symbol min typ max unit output voltage set-point all v o, set -1.2 ? +1.2 % v o, set (v in =v n, min , i o =i o, max , t a =25c) output voltage all v o, set -3.0 ? +3.0 % v o, set (over all operating input voltage, resistive load, and temperature conditions until end of life) adjustment range all v o 0.7887 5.5 vdc selected by an external resistor output regulation line (v in =v in, min to v in, max ) all ? 0.01 0.1 % v o, set load (i o =i o, min to i o, max ) all ? 0.1 0.2 % v o, set temperature (t ref =t a, min to t a, max ) all ? 0.5 1 % v o, set output ripple and noise on nominal output (v in =v in, nom and i o =i o, min to i o, max cout = 2 * 0.47f ceramic capacitors) rms (5hz to 20mhz bandwidth) all ? 5 15 mv rms peak-to-peak (5hz to 20mhz bandwidth) all ? 15 50 mv pk-pk external capacitance esr 1 m ? all c o, max ? ? 1000 f esr 10 m ? all c o, max ? ? 10,000 f output current all i o 0 25 adc output current limit inception (hiccup mode ) all i o, lim ? 125 150 % i o output short-circuit current all i o, s/c ? 1 ? adc (v o 250mv) ( hiccup mode ) efficiency v o,set = 0.8vdc 79.0 % v in = v in, nom , t a =25c v o, set = 1.2vdc 84.7 % i o =i o, max , v o = v o,set v o,set = 1.5vdc 87.3 % v o,set = 1.8vdc 88.9 % v o,set = 2.0vdc 89.7 % v o,set = 2.5vdc 91.4 % v o,set = 3.3vdc 93.1 % v o,set = 5.5vdc 95.1 % switching frequency all f sw ? 500 ? khz dynamic load response (dio/dt=5a/ s; v in = v in, nom ; t a =25c) all v pk ? 150 mv load change from io= 50% to 100% of io,max; no external output capacitors peak deviation settling time (vo<10% peak deviation) all t s ? 25 ? s (dio/dt=5a/ s; v in = v in, nom ; t a =25c) all v pk ? 150 mv load change from io= 100% to 50%of io,max: no external output capacitors peak deviation settling time (vo<10% peak deviation) all t s ? 25 ? s www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 4 general specifications parameter min typ max unit calculated mtbf (i o =80% of i o, max , t a =25c) 2,150,000 hours weight ? 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 (v in =v in, min to v in, max ; open collector or equivalent, signal referenced to gnd) logic high (seq/ena pin open ? module off) seq/ena current all i seq/ena 0.5 ? 2.33 ma seq/ena voltage: all v seq/ena 3.5 ? 14 v logic low (module on) seq/ena current: all i seq/ena ? ? 200 a seq/ena voltage: all v seq/ena ? ? 1.2 v turn-on delay and rise times all tdelay D 1 D msec (i o =i o, max , v o to within 1% of steady state) all trise D 5 D msec output voltage overshoot ? startup 0.1 0.5 % v o, set i o =80% of i o, max ; v in = 12vdc, t a = 25 o c ouptut overvoltage protection (latching) all 5.62 5.8 6.0 v input undervoltage lockout turn-on threshold all 9.9 v turn-off threshold all 8.1 v remote sense range D D 0.5 v overtemperature protection all t ref ? 125 ? c (see thermal consideration section) forced load share accuracy all ? 10 % io number of units in parallel 5 www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 5 characteristic curves the following figures provide typical characteristics for the NXA025a0x ?s at 25oc. 80% 81% 82% 83% 84% 85% 86% 87% 88% 0 5 10 15 2 0 2 5 vin=13.2v vin=10.8v vin=12.0v 88% 89% 90% 91% 92% 93% 94% 0 5 10 15 2 0 2 5 vin=13.2v vin=10.8v vin=12.0v efficiency, (%) output current, i o (a) efficiency, (%) output current, i o (a) figure 1. converter efficiency versus output current (vout = 1.2vdc). figure 4. converter efficiency versus output current (vout = 2.5vdc). 83% 84% 85% 86% 87% 88% 89% 90% 91% 0 5 10 15 20 25 vin=13.2v vin=10.8v vin=12.0v 88% 89% 90% 91% 92% 93% 94% 95% 0 5 10 15 2 0 2 5 vin=13.2v vin=10.8v vin=12.0v efficiency, (%) output current, i o (a) efficiency, (%) output current, i o (a) figure 2. converter efficiency versus output current (vout = 1.5vdc). figure 5. converter efficiency versus output current (vout = 3.3vdc). 85% 86% 87% 88% 89% 90% 91% 92% 0 5 10 15 20 25 vin=13.2v vin=10.8v vin=12.0v 89% 90% 91% 92% 93% 94% 95% 96% 97% 0 5 10 15 20 25 vin=13.2v vin=10.8v vin=12.0v efficiency, (%) output current, i o (a) efficiency, (%) output current, i o (a) figure 3. converter efficiency versus output current (vout = 1.8vdc). figure 6. converter efficiency versus output current (vout = 5.0vdc). www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 6 characteristic curves (continued) the following figures provide typical characteristics for the NXA025a0x ?s at 25oc. output voltage v o (v) (20mv/div) time , t ( 1 figure 7. typical output ripple and noise (vin = 12v dc, vo = 3.3 vdc, cout = 2x 0.47uf ceramic capacitor). figure 10. transient response to dynamic load change from 100% to 50% of full load (vo = 3.3vdc). output voltage v o (v) (20mv/div) time, t (1 s/div) output voltage, input voltage v o (v) (1v/div) v in (v) (2v/div) time, t (0.5ms/div) figure 8. typical output ripple and noise (vin = 12v dc, vo = 1.2vdc, cout = 2x 0.47uf ceramic capacitor). figure 11. typical start-up with application of vin (vo = 3.3vdc). output current output voltage i o (a) (5a/div) v o (v) (50mv/div) time, t (5 s/div) output voltage on/off voltage v o v) (1v/div) v on/off (v) (2v/div) time, t (0.5ms/div) figure 9. transient response to dynamic load change from 50% to 100% of full load (vo = 3.3vdc). figure 12. typical start-up using enable (vo = 3.3vdc). www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 7 characteristic curves (continued) the following figures provide typical characteristics for the NXA025a0x ?s at 25 o c. module # 1 module #2 v o (v) (1v/div) v o (v) (1v/div) time, t (1ms/div) figure 13. synchronized start-up of output voltage when seq/ena pins are tied together (module #1 = 1.5vdc , module #2 = 3.3vdc ) . module # 1 module #2 v o (v) (1v/div) v o (v) (1v/div) 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). www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 8 characteristic curves (continued) the following figures provide typical thermal derating curves for NXA025a0x ?s (figures 19 and 20 show derating curves with base plate). 0 5 10 15 20 25 30 20 30 40 50 60 70 80 1 00lfm 200lfm 300lfm 400lfm 0 5 10 15 20 25 30 20 30 40 50 60 70 80 1 00lfm 200lfm 300lfm 400lfm output current, io (a) ambient temperature, t a o c output current, io (a) ambient temperature, t a o 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). 0 5 10 15 20 25 30 20 30 40 50 60 70 80 1 00lfm 200lfm 300lfm 400lfm 0 5 10 15 20 25 30 20 30 40 50 60 70 80 200 lfm 100 lfm output current, io (a) ambient temperature, t a o c output current, io (a) ambient temperature, t a o 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. 0 5 10 15 20 25 30 20 30 40 50 60 70 80 1 00lfm 200lfm 300lfm 400lfm 0 5 10 15 20 25 30 20 30 40 50 60 70 80 200 lfm 100 lfm 300 lfm 400 lfm output current, io (a) ambient temperature, t a o c output current, io (a) ambient temperature, t a o c figure 17. derating output current versus local ambient temperature and airflow (vin = 12vdc, vo=3.3 vdc). figure 20. derating output current versus local ambient temperature and airflow (vin = 12vdc, vo=5.0 vdc) with baseplate. www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 9 test configurations to oscilloscope current probe l test 1h battery c s 220f e.s.r.<0.1 ? @ 20c 100khz min 150f v in (+) com note: measure input reflected ripple current with a simulated source inductance (l test ) of 1h. capacitor c s offsets possible battery impedance. measure current as shown above. c in figure 21. input reflected ripple current test setup. 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. v o (+) com 1uf . resistive load scope copper strip ground plane 10uf figure 22. output ripple and noise test setup. v o com v in (+) com r load r contact r distribution r contact r distribution r contact r contact r distribution r distribution v in v o 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. = v o . i o v in . i in x 100 % efficiency typical application circuit vout qx rx 4.99k dx share sen+ seq/en a sen- gnd gnd gnd vin vin vout vout v in c in cout share 1uf r trim figure 24. application schematic design considerations input source impedance the power module should be connected to a low-impedance source. highly inductive source impedance can affect the stability of the power module. the input capacitor c in should be located equal distance from the two input pins of the module. c in is recommended to be 150f 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 ?0.5h) is recommended at the input of each module to prevent interaction between modules. consult the factory for further application guidelines. safety considerations 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. www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 10 feature description remote on/off using seq/ena pin the NXA025a0x-s smt 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 (v seq/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 v in r 2 r 1 qx 1k 4.99k enable uvlo thermal_sd seq/ena pin rx 4.99k dx 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 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 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% i o, max . input undervoltage lockout 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 t ref , exceeds 125 o c (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-s can be programmed to any voltage from 0.8vdc to 5.5vdc by inserting a series resistor (shown as r trim 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 1f multi- layer ceramic capacitor is required from r trim to sense (-) pin to minimize noise. to calculate the value of the www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 11 feature descriptions (continued) output voltage programming (continued) resistor rtrim for a particular desired voltage vo , use the following equation: ? ? ? ? ? ? ? ? = 1 7887 . 0 * 775 vo rtrim where vo is the desired output voltage and r trim 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: ? ? ? ? ? ? ? = 1 7887 . 0 5 . 2 * 775 rtrim ? = 1682 rtrim v o com v in (+) com r load r trim sense+ sense- 1f ena share 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 ? 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 forced load sharing (parallel operation) 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 5. when not using the parallel feature, leave the share pin open. figure 28. circuit configuration for modules in parallel. www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 12 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, t ref used in the specifications is shown in figure 29. for reliable operation this temperature should not exceed 110 o c. tref tref figure 29. t ref 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 (t a ) for natural convection and up to 2m/s (400 ft./min) are shown in the respective characteristics curves section. base-plate option (-h) the baseplate option (-h) power modules are constructed with baseplate on topside of the open frame power module. the baseplate includes two through-threaded, m3 x 0.5 mounting hole pattern, 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.) during heat sink assembly. the baseplate option allows customers to operate the module in an extreme thermal environment with attachment of heatsink/cold-plate for proper cooling of internal component to heighten reliable and consistent operation. the thermal reference point for baseplate option is center of the heat plate on the top-side. for reliable operation this temperature should not exceed 105 o c. 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. www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 13 mechanical outline for NXA025a0x-s 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 ground 2 vout 3 ground 4 vout 5 ground 6 vin 7 share 8 sen+ 9 seq/ena 10 sen- 11 vin www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 14 mechanical outline for NXA025a0x-hs 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 ground 2 vout 3 ground 4 vout 5 ground 6 vin 7 share 8 sen+ 9 seq/ena 10 sen- 11 vin for additional heat sink attachment: accepts m3x0.5 carbon steel screws insertion into baseplate not to exceed 4.55 mm [0.175 in]. max torque = 5 in-lbs www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 15 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 www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 16 mechanical outline for NXA025a0x-l 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 ground 2 vout 3 ground 4 vout 5 ground 6 vin 7 share 8 sen+ 9 seq/ena 10 sen- 11 vin www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 17 recommended pad layout for NXA025a0x-l (through hole version) 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.) x.xx mm 0.25 mm (x.xxx in 0.010 in.) www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 18 surface mount information packaging details the surface mount versions of the NXA025-s series modules are supplied as standard in the plastic tray shown in figure 30. the tray has external dimensions of 136mm (w) x 322.6mm (l) x 18.4mm (h) or 5.35in (w) x 12.7in (l) x 0.72in (h). figure 30. surface mount packaging tray tray specification material antistatic coated pvc max temperature 65 o c max surface resistivity 10 12 ? /sq color clear capacity 15 power modules min order quantity 45 pcs (1box of 3 full trays) each tray contains a total of 15 power modules. the trays are self-stacking and each shipping box will contain 3 full trays plus one empty hold down tray giving a total number of 45 power modules. pick and place the NXA025-s series of dc-to-dc power modules use an open-frame construction and are designed for surface mount assembly within a fully automated manufacturing process. the NXA025-s series modules are fitted with two kapton labels designed to provide a large flat surface for pick and placing. the labels are located covering the center of gravity of the power module. the labels meets all the requirements for surface-mount processing, as well as meeting ul safety agency standards. the labels will withstand reflow temperatures up to 300 c. the labels also carry product information such as product code, date and location of manufacture. one of the two labels may be used as a pick-and-place location. figure 31. pick and place location. nozzle recommendations the module weight has been kept to a minimum by using open frame construction. even so, they have a relatively large mass when compared with conventional smt components. variables such as nozzle size, tip style, vacuum pressure and placement speed should be considered to optimize this process. the minimum recommended nozzle diameter for reliable operation is 6mm. the maximum nozzle outer diameter, which will safely fit within the allowable component spacing, is 9 mm. oblong or oval nozzles up to 11 x 9 mm may also be used within the space available. for further information please contact your local tyco electronics power systems technical sales representative. www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 19 surface mount information (continued) reflow soldering information these NXA025series power modules are large mass, low thermal resistance devices and typically heat up slower than other smt components. it is recommended that the customer review data sheets in order to customize the solder reflow profile for each application board assembly. the following instructions must be observed when smt soldering these units. failure to observe these instructions may result in the failure of or cause damage to the modules, and can adversely affect long-term reliability. these surface mountable modules use our newest smt technology called ?column pin? (cp) connectors. fig 32 shows the new cp connector before and after reflow soldering onto the end-board assembly. nxa board insulator solder ball end assembly pcb figure 32. column pin connector before and after reflow soldering. the cp is constructed from a solid copper pin with an integral solder ball attached, which is composed of tin/lead (sn/pb) solder. the cp connector design is able to compensate for large amounts of co-planarity and still ensure a reliable smt solder joint. typically, the eutectic solder melts at 183 o c, wets the land, and subsequently wicks the device connection. sufficient time must be allowed to fuse the plating on the connection to ensure a reliable solder joint. there are several types of smt reflow technologies currently used in the industry. these surface mount power modules can be reliably soldered using natural forced convection, ir (radiant infrared), or a combination of convection/ir. for reliable soldering the solder reflow profile should be established by accurately measuring the modules cp connector temperatures. reflow temp ( c) 0 50 10 0 15 0 200 250 300 p reheat zone max 4 o cs -1 so ak zo ne 30-240s heat zo ne max 4 o cs -1 p eak temp 235 o c cooling zo ne 1- 4 o cs -1 t lim above 205 o c reflow time (s) figure 32. recommended reflow profile. max temp solder ( c) 200 205 210 215 220 225 230 235 240 0 102030405060 time limit (s) figure 33. time limit curve above 205 o c reflow. www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current tyco electronics power systems 20 surface mount information (continued) lead free soldering the ?z version naos smt modules are lead-free (pb- free) and rohs compliant and are both forward and backward compatible in a pb-free and a snpb soldering process. failure to observe the instructions below may result in the failure of or cause damage to the modules and can adversely affect long-term reliability. pb-free reflow profile power systems will comply with j-std-020 rev. c (moisture/reflow sensitivity classification for nonhermetic solid state surface mount devices) for both pb-free solder profiles and msl classification procedures. this standard provides a recommended forced-air-convection reflow profile based on the volume and thickness of the package (table 4-2). the suggested pb-free solder paste is sn/ag/cu (sac). the recommended linear reflow profile using sn/ag/cu solder is shown in fig. 34. msl rating the naos smt modules have a msl rating of 2. storage and handling the recommended storage environment and handling procedures for moisture-sensitive surface mount packages is detailed in j-std-033 rev. a (handling, packing, shipping and use of moisture/reflow sensitive surface mount devices). moisture barrier bags (mbb) with desiccant are required for msl ratings of 2 or greater. these sealed packages should not be broken until time of use. once the original package is broken, the floor life of the product at conditions of 30c and 60% relative humidity varies according to the msl rating (see j-std-033a). the shelf life for dry packed smt packages will be a minimum of 12 months from the bag seal date, when stored at the following conditions: < 40 c, < 90% relative humidity. 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 tyco electronics board mounted power modules: soldering and cleaning application note (ap01-056eps). per j-std-020 rev. c 0 50 100 150 200 250 300 reflow time (seconds) reflow temp (c) he ating zone 1c/second peak temp 260c * min. time above 235c 15 seconds *time above 217c 60 seconds cooling zone figure 34. recommended linear reflow profile using sn/ag/cu solder. www.datasheet.in
data sheet november 9, 2006 naos tm NXA025 smt non-isolated power modules: 10 ? 14vdc input; 0.8vdc to 5.5vdc output; 25a output current world wide headquarters tyco electronics power systems, inc. 3000 skyline drive, mesquite, tx 75149, usa +1-800-526-7819 (outside u.s.a.: +1-972-284-2626 ) www.power.tycoelectronics.com e-mail: techsupport1@tycoelectronics.com europe, middle-east and africa headquarters tyco electronics power systems tel: +49 89 6089 286 latin america, brazil, caribbean headquarters tyco electronics power systems tel: +56 2 209 8211 india headquarters tyco electronics systems india pte. ltd. tel: +91 80 841 1633 x3001 asia-pacific headquarters tyco electronics singapore pte. ltd. tel: +65 6416 4283 tyco electronics corporation reserves the right to make changes to the product(s) or information contained herein without notic e. 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. ? 2003 tyco electronics power systems, inc., (mesquite, texas) all international rights reserved. document no: ds03-030 ver. 1.4 pdf name: NXA025_smt_ds.pdf ordering information please contact your tyco electronics? 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-s 10 ? 14 vdc 0.8vdc ? 5.5vdc 25 a 93 % smt 108975053 NXA025a0x-hs 10 ? 14 vdc 0.8vdc ? 5.5vdc 25 a 93 % smt 108975061 NXA025a0x-l 10 ? 14 vdc 0.8vdc ? 5.5vdc 25 a 93 % th 108988515 NXA025a0x-lp 10 ? 14 vdc 0.8vdc ? 5.5vdc 25 a 93 % th cc109101350 NXA025a0x-sp 10 ? 14 vdc 0.8vdc ? 5.5vdc 25 a 93 % smt cc109101342 NXA025a0x-lpz 10 ? 14 vdc 0.8vdc ? 5.5vdc 25 a 93 % th cc109106746 NXA025a0x-sz 10 ? 14 vdc 0.8vdc ? 5.5vdc 25 a 93 % smt 109100402 NXA025a0x-hsz 10 ? 14 vdc 0.8vdc ? 5.5vdc 25 a 93 % smt 109100393 NXA025a0x-lz 10 ? 14 vdc 0.8vdc ? 5.5vdc 25 a 93 % th cc109107174 NXA025a0x-spz 10 ? 14 vdc 0.8vdc ? 5.5vdc 25 a 93 % smt cc109133682 -z refers to rohs-compliant versions. www.datasheet.in

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