transient response from 0a to rated full load (up to 30a/s), recovery within 100sec democratic current sharing, no need for master/slave configuration programmable output voltage remote enable pin power good signal true double ended differential remote sense true output overvoltage protection with on-board fuse overcurrent foldback, short circuit protection overtemperature protection edge tab mount via gold plated fingers for low interconnect voltage drop small size 1.375 x 2.75 x 0.588 inches high power density, small footprint the nxa66 non-isolated dc/dc converter is targeted at computing applications that require point of load power conversion. the nxa66 is designed to meet the precise voltage and fast transient requirements of todays high performance applications such as workstations, file servers, desktop computers, telecommunications equipment, adapter cards, dsp and data processing. employing synchronous rectification and democratic current sharing, the nxa66 can be used in a stand-alone configuration, or paralleled as a building block to achieve higher output currents or redundancy. the current sharing specifications are met during static conditions and transient conditions. the advanced democratic current sharing technique employed by the nxa66 removes the need for cumbersome master/slave combinations. the nxa66 uses gold plated edge tab fingers for a convenient, low impedance interconnect scheme. this also allows system designers to easily accommodate future expansion in their systems. the nxa66 has been mechanically designed to be compatible with integral latch retention mechanisms for improved shock and vibration performance in the application. nxa66 series single output, selectable patents pending [ 5 year warranty ] nxa66 series | 66 w dc/dc 66 watt non-isolated dc/dc converters 1
absolute maximum ratings input characteristics turn on/off sxa10 series | 1 0w dc/dc characteristic symbol min typ max units notes and conditions input voltage - operating vin (oper) 10.8 12 13.2 vdc input current - no load lin 100 madc input current - quiescent lin (off) 10 madc inrush current (i 2 t) linrush 0.5 a 2 s nxa66 series | 66 w dc/dc 66 watt non-isolated dc/dc converters 2 characteristic symbol min typ max units notes and conditions input voltage - turn on vin (on) 10.4 vdc input voltage - turn off vin (off) 8.2 vdc hysteresis 2.2 vdc turn on delay - enabled, tdelay 10 15 msec with the enable signal asserted, then power applied (power) this is the time from when the input voltage reaches the minimum specified operating voltage until the output voltage is within the total regulation band turn on delay - power tdelay 10 15 msec with input voltage greater than applied, then enabled (enable) the turn-on voltage, this is the time from when the enable pin is de-asserted until the output voltage is within the total regulation band output overshoot at vovershoot 0 1 % applies when enable pin is turn on/off toggled or when input voltage is applied rise time trise 10 msec from 10% to 90%; full resistive load, no external capacitance characteristic symbol min typ max units notes and conditions input voltage - continuous vin (cont) 0 13.5 vdc vin(+) - vin(-) input voltage - peak/surge vin (peak) 0 13.5 v peaks of any duration or standard/level operating temperature ta 0 +100 ?c ambient temperature. see derating curves on page 7 storage temperature tstorage -40 +100 ?c airflow v air 200 lfm either direction, along connector axis. see derating curves on page 7
nxa66 series | 66 w dc/dc 66 watt non-isolated dc/dc converters 3 www.artesyn.com signal electrical interface common control reliability and service life characteristic symbol min typ max units notes and conditions remote sense compensation 500 mv true +sense and -sense differential amplifier characteristic - signal name symbol min typ max units notes and conditions power good output: high level output voltage voh see note v output is internally pulled up by a 4.7k resistor to vo. a high indicates that the main output is within 10% of nominal value. this signal transitions high within 20ms of the output voltage coming into power good spec. output enable - outen: high level input voltage vih 10.8 12 13.2 v iih = 0a; open circuit voltage high level input current iih -25 a allowable leakage current from signal pin into the open collector driver low level input voltage vii 0 0.8 v converter guaranteed off when outen is less than vil(max) low level input current iii -1.2 ma vil = 0.8v low level input current iil (max) -1.3 ma vii = 0.0v; maximum source current with output enable pin shorted to ground voltage select pin - vsp high level input voltage vih 10.8 12 13.2 v iih = 0a; open circuit voltage, vsp = 1, vo = 3.3v high level input current iih -25 a allowable leakage current from signal pin into the open collector driver low level input voltage vii 0 0.8 v vsp = 0, vo = 2.5v when vsp is less than vii (max) low level input current iii -1.2 ma vii = 0.8v low level input current iii (max) -1.1 ma vii = 0.0v; maximum source current with vsp pin shorted to ground characteristic symbol min typ max units notes and conditions mean time between failure mtbf 3,500,000 hours bellcore tr-332 calculated
other specifications environmental requirements sxa10 series | 1 0w dc/dc nxa66 series | 66 w dc/dc 66 watt non-isolated dc/dc converters 4 safety agency approvals characteristic ul file number approval pending csa file number approval pending vde file number approval pending vde license number approval pending standards compliance list standard category en60950 plus a1 and a2 (pending, designed to meet) ul1950 3rd edition (pending, designed to meet) characteristic symbol min typ max units notes and conditions switching frequency fsw 300 khz fixed frequency weight 42.6 g characteristic symbol min typ max units notes and conditions max. temperature shock 5 ?c/10 min. (operating) temperature shock (operating) 10 ?c/hour temperature shock 20 ?c/hour (non-operating) humidity (operating) 85 %rh humidity (storage) 95 %rh altitude (operating) 0 10,000 ft altitude (storage) 0 50,000 ft shock (operational) 50 g 11ms half sine wave vibration (operational) 0.01 0.02 g 2 /hz from 5hz to 20hz, maintaining 0.02g 2 /hz from 20hz to 500hz, all axes vibration (non-operational) 0.01 0.02 g 2 /hz from 5hz to 20hz, maintaining 0.02g 2 /hz from 20hz to 500hz, all axes shock (non-operational) 50 g 11ms half sine wave electrostatic discharge esd 15 kv initilization level; esd event (operating) shall cause no out-of-regulation conditions electrostatic discharge esd 25 kv initialization level (non-operating)
nxa66 series | 66 w dc/dc 66 watt non-isolated dc/dc converters 5 www.artesyn.com material ratings model numbers characteristic - signal name symbol value units notes and conditions flammability rating ul94v-0 material type fr4 pcb input characteristics 3.3v/2.5 model characteristic symbol min typ max units notes and conditions input current - operating iin 6.8 adc vin = vin (nom); iout = iout (max.); vo = 3.3v (measured at converter) input current - maximum iin (max.) 9.5 adc vin = vin (off) (min); iout = iout (max.); vo = 3.3v (measured at converter) reflected ripple current iin (ripple) 100 ma pk-pk iout - iout (max.), measured with recommended external bypass capacitor input capacitance - internal cinput 25 f internal to converter filter input capacitance - external cbypass 0 100 no max. f recommended customer added bypass capacitance. low esr type electrical characteristics - o/p 3.3v/2.5 model characteristic symbol min typ max units notes and conditions total regulation band vsp = 1 vout 3.15 3.30 3.45 vdc for all line, static/dynamic load vsp = 0 vout 2.39 2.50 2.61 vdc and temperature until end of life. with 2 x 820f sp oscons across output output current - continuous iout 0.00 20.0 adc output current - short circuit isc 2.0 adc continuous, unit auto recovers from short (average o/p current) output voltage - noise vpard 30 mv pk-pk measurement bandwidth: 20mhz. with 2 x 820f sp oscons across output model input nominal nominal output minimum maximum number voltage output voltage current efficiency load reg. NXA66-12P3V3C 12vdc 3.3/2.5v 20a 86/82% 1.0%
sxa10 series | 1 0w dc/dc nxa66 series | 66 w dc/dc 66 watt non-isolated dc/dc converters 6 electrical characteristics - o/p 3.3v/2.5 model protection and control features 3.3v/2.5 model efficiency 3.3v/2.5 model characteristic symbol min typ max units notes and conditions dynamic regulation - peak vdynamic 100 mv pk diout: no load to full load, di/dt = 1a/sec. external output capacitor is 2 x 820f sp oscons dynamic regulation - trecovery 100 150 sec recovery time external load capacitance cext 4000 f operation with more than the maximum value is possible, but please consult artesyn before doing so characteristic symbol min typ max units notes and conditions overvoltage crowbar voltage vcrow 115 120 % output rising above these thresholds fires the on-board scr and disables the pwm gate drive circuitry. the scr blows the on-board fuse which protects the output from the input overcurrent protection ioc 26.0 adc hiccup type protection, inception current impedance of short <90m current share ishare 0.00 10.0 % single line current share, maximum current imbalance between units at iomax characteristic symbol min typ max units notes and conditions efficiency (light load) h 25.0 % iout = 0.25a; vin = 12vdc efficiency (full load) vsp = 1 h 86.0 % vout = 3.3v: iout = 100% iout (max); vin = 12vdc vsp = 0 h 82.0 % vout = 2.5v: iout = 100% iout (max); vin = 12vdc
figure 1 - mechanical drawing note 1 mechanical drawing in this view, row a of the edge connector is visible. the leftmost pin is pin 1, and the rightmost pin is pin 25. row b of the connector is on the opposite side of the unit. pin 50 is behind pin 1, pin 26 is behind pin 25. see below for pinout. note 2 mating connector recommended mating connector is amp 145432 or equivalent. pin 44 is absent and is used for electrical key. amp keying plug pn 65025-2 may be placed in the mating connector between pins 33 and 34, and between pins 17 and 18. this keying plug serves as a mechanical key. pin connections 2.750 (69.85) 1.065 (27.05) 1.375 (34.93) 1-25 26-50 50 34 33 25 18 17 1 26 26-50 1-25 0.125 (3.18) 0.400 (10.16) 0.700 (17.78) 2.586 (65.68) 0.875 (22.23) r0.080 (r2.03) (2 pls) on ckt board heatsink 0.588 (14.92) all dimensions in inches (mm) (see notes 1 and 2) pin no. row a row b pin no. 1 12v in rtn 50 2 12v in rtn 49 3 12v in rtn 48 4 12v in rtn 47 5 12v in rtn 46 6 reserved rtn 45 7 vsp 8 pwrgd reserved 43 9 outen ishare 42 10 reserved reserved 41 11 vo-sense vo-sense rtn 40 12 vout return 39 13 vout rtn 38 14 vout rtn 37 15 vout rtn 36 16 vout rtn 35 17 vout rtn 34 18 vout rtn 33 19 vout rtn 32 20 vout rtn 31 21 vout rtn 30 22 vout rtn 29 23 vout rtn 28 24 vout rtn 27 25 vout rtn 26 ambient temperature ( c) output current (a) 0 2 4 6 8 10 12 14 16 18 20 10 20 30 40 50 60 70 80 90 100 400 lfm 300 lfm 200 lfm 100 lfm zero air derating curve nxa66 series | 66 w dc/dc 7 www.artesyn.com
ds_nxa66_20000204.pdf data sheet ? artesyn technologies?, 2000 the information and specifications contained in this data sheet are believed to be correct at time of publication. however, artesyn technologies accepts no responsibility for consequences arising from printing errors or inaccuracies. specifications are subject to change without notice. no rights under any patent accompany the sale of any such product(s) or information contained herein. nxa66 series | 66 w dc/dc 66 watt non-isolated dc/dc converters north america e-mail: sales.us@artesyn.com % 800 769 7274 % +508 628 5600 european locations e-mail: sales.europe@artesyn.com ireland % +353 24 93130 austria % +43 1 80150 far east locations e-mail: sales.asia@artesyn.com hong kong % +852 2699 2868 8 www.artesyn.com
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