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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鈥檚 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 25擄C 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
400碌s
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
5藲C/10 min.
10藲C/hour
20藲C/hour
85% RH
95% RH
10,000 feet max.
50,000 feet max.
50G 11ms
half sine wave
0.02G
2
/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
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