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NXA66 Series
DC/DC CONVERTERS
Single output (Non-Isolated)
66W Non-isolated DC/DC Converters 1
* Transient response from 0A to rated full load (up to 30A/s), recovery within 250s * Democratic current sharing, no need for master/slave configuration * Programmable output voltage * Remote enable pin * Power good signal * True double ended differential remote sense
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 today's 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.
All specifications are typical at nominal input, full load at 25C unless otherwise stated
2 YEAR WARRANTY
SPECIFICATIONS
OUTPUT SPECIFICATIONS Voltage adjustability Total error band Ripple and noise Transient response peak dev. settling time Short circuit protection Isc = 25A rms INPUT SPECIFICATIONS Input voltage range Input current UVLO turn ON voltage UVLO turn OFF voltage Start-up time Nominal line 12Vin nominal No load Remote OFF 10.8 to 13.2VDC 100mA typ. 10mA max. 10.4V max. 8.2V min. 15ms Ref. to -input 10.8VDC min. 0.8VDC max. 3V3 output 2V5 output Vout programmable to 2V5 or 3V3 4.5% 4.5%
GENERAL SPECIFICATIONS Efficiency Switching frequency Approvals and standards Weight MTBF Bellcore 332 3V3 output 2V5 output Fixed 86% 82% 300kHz EN60950 Bi-national UL1950 CSA C22.2 No. 234/950 42.6g (1.5 oz) 3,500,000 hours
(20MHz bandwidth) 150mV pk-pk max. 50% to 75% and back to 1.0%, no external cap. 150mV 400s
Continuous automatic recovery
ENVIRONMENTAL SPECIFICATIONS Maximum temperature shock Temperature shock Humidity Altitude Shock Vibration (See Note 3) Electrostatic discharge Operating Operating Non-operating Operating Storage Operating Storage Operational and non-operational Operational and non-operational Operating (See Note 4) non-operating 5C/10 min. 10C/hour 20C/hour 85% RH 95% RH 10,000 feet max. 50,000 feet max. 50G 11ms half sine wave 0.02G2/Hz max. ESD 15kV ESD 25kV
Active high remote ON/OFF Logic compatibility ON Open circuit voltage OFF
File Name: NXA66.PDF Rev: 31 July 2001
NXA66 Series
DC/DC CONVERTERS
INPUT VOLTAGE 12VDC Notes
1
Single output (Non-Isolated)
66W Non-isolated DC/DC Converters 2
For the most current data and application support visit www.artesyn.com/powergroup/products.htm
NOMINAL OUTPUT VOLTAGE 3.3/2.5V
NOMINAL OUTPUT CURRENT 20A
MINIMUM EFFICIENCY 86/82%
MODEL NUMBER NXA66-12P3V3C
2
Output Current (A)
3 4
In this view, row B of the edge connector is visible. The leftmost pin is pin 50, and the rightmost pin is pin 26. Row A of the connector is on the opposite side of the unit. Pin 1 is behind pin 50, pin 25 is behind pin 26. See below for pinout. 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. From 5Hz to 20Hz, maintaining 0.02G2/Hz from 20Hz to 500Hz, all axes. Initilization level; ESD event shall cause no out-of-regulation conditions.
Derating Curve
20 18 16 14 12 10 8 6 4 2 0
10 20 30 40 50 60 70 80 90 100
100 Lfm 200 Lfm 400 Lfm 300 Lfm
PIN CONNECTIONS PIN NO. ROW A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 12V in 12V in 12V in 12V in 12V in Reserved VSP PWRGD OUTEN Reserved Vo-sense Vout Vout Vout Vout Vout Vout Vout Vout Vout Vout Vout Vout Vout Vout Reserved Ishare Reserved Vo-sense rtn Return Return RTN RTN RTN RTN RTN RTN RTN RTN RTN RTN RTN RTN 43 ROW B RTN RTN RTN RTN RTN RTN PIN NO. 50 49 48 47 46 45
Zero Air
Ambient Temperature (C)
2.750 (69.85)
42 41 40 39 38 37 36
1.065 (27.05) R0.080 (R2.03) (2 PLS) ON CKT BOARD 0.875 (22.23) 0.588 (14.92) HEATSINK
35 34
1.375 (34.93) 0.700 (17.78)
1-25 26-50 50 1 34 33 17 18 26 25 26-50 1-25
33 32 31
0.125 (3.18)
2.586 (65.68)
0.400 (10.16)
30 29 28 27 26
ALL DIMENSIONS IN INCHES (mm)
(See Notes 1 and 2)
Data Sheet (c) Artesyn Technologies(R) 2002 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.
Please consult our website for the following items: Longform Data Sheet
www.artesyn.com
File Name: NXA66.PDF Rev: 31 July 2001

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