175 WATTS	NO MINIMUM ORDER REQUIRED
NXT-175 SERIES	OUTPUT SPECIFICATIONS
Features RoHS Compliant 2 Year Warranty  High Efficiency, 85% typical  High Power Density,9.3 W/cu in.  Compact 3.0" X 5.0" X 1.25" Size EN 60950-1 ITE Certification  EN 60601-1 Medical Certification  EMC to EN 61000-6-2 & EN 60601-1-2  Advanced SMT Design  Optional Chasis & Cover   Optional Single Wire Load Sharing Optional Remote Inhibit/Enable	Total Output Power at 50C 115w    Convection Cooled, Open Frame                             175W 300 LFM Forced Air, Open Frame Power Derating 1.0 Wout / 1Vin below 100 Vin Voltage Centering +/-0.5% (50% Load) Voltage Adjust Range  95-105% Load Regulation  0.5% (0-100% load change) Source Regulation  0.5% Noise 1.0% or 100mV Whichever is greater Transient Response Output recovers to within 1% of initial set point due to a 50% step load change, 500uS maximum, 4% maximum deviation.   Turn on Overshoot  None Overvoltage Protection Latching, between 110% and 150% of rated output voltage. Overpower Protection 110-130% rated Pout, cycle on/off, auto recovery Hold Up Time 16 mS min., Full Power, 85-264V Input Start Up Time 3 Seconds, 120V Input

SAFETY SPECIFICATIONS

INPUT SPECIFICATIONS

General   Protection Class: I Overvoltage Category: II Pollution Degree: 2     Underwriters Laboratories File E137708/E140259   UL 60950-1 First Edition             UL 60601-1           First Edition CB Report per IEC 60950-1(2001)       First Edition             All National Deviations           CB Certificates per IEC 60601-1(1988)  Second Edition A1, A2   UL Recognition Mark for Canada File E137708/E140259 CAN/CSA-C22.2 No. 60950-1-03   CAN/CSA-C22.2 No. 601-1-M90             with updates 1 and 2   TUV EN 60950-1:2001 EN 60601-1/A2: 1995     Low Voltage Directive     GENERAL SPECIFICATIONS Deilectric Strength:   Reinforced Insulation 5656 VDC,Primary to Secondary,1 Sec. Basic Insulation 2545 VDC,Primary to Ground,1 Sec. Operational Insulation 707 VDC,Secondary to Ground,1 Sec. Leakage Current        <300uA Earth Leakage Current Power Fail Signal Logic low with input power failure 10 ms minimum prior to output 1 droppping 1%. Remote Inhibit (optional) Isolated. Contact closure inhibits output. Load Share (optional) Single wire current sharing with return via negative sense return. Minimum current share load is 10% of each module's output current rating. Maximum output voltage deviation between modules is 5% for 2.5 through 5V models and 400mV for remaining models. Standby Power (optional) Isolated 5Vdc +/- 10%,10mA available only with Remote Inhibit option. Remote Sense 400mV compensation of output cable losses Mean-Time Between Failures 100,000 Hours min.,MIL-HDBK-217F,25 C,GB Weight 0.85 Lbs  Open Frame    1.37 Lbs  Chassis and Cover S ELECTROMAGNETIC COMPATIBILITY SPECIFICATIONS Electrostatic Discharge EN 61000-4-2  +/-6kVContact Discharge             +/-8kV Air Discharge Radiated Electro-magnetic Field EN 61000-4-3 80-2500MHz, 10V/m, 80%AM EFT/Bursts EN 61000-4-4    +/-2kV Surges EN 61000-4-5  +/-2kV Line to Earth                   +/-1kV Line to Line Conducted Immunity EN 61000-4-6  .15-80MHz., 10V, 80% AM Voltage Dips EN 61000-4-11 95% Dip,10ms     30% Dip,500ms 60% Reduction, 1s (Criteria B)       Voltage Interruptions EN 61000-4-11 95% Reduction,5s Radiated Emissions EN 55011/22, FCC Part 15 Class B Conducted Emissions EN 55011/22, FCC Part 15 Class B Harmonic Current Emissions EN 61000-3-2 Compliance Magnetic Field Immunity EN 61000-4-8 30A/m, 50/60Hz. Voltage Fluctuations and Flicker EN 61000-3-3 Compliance Power Factor EN 61000-3-2 Compliance

Source Voltage 85-264 Volts AC, 120-370 Volts DC                                                Frequency Range 47-63 Hz Input Protection Internal 5A Time Delay fuse Peak Inrush Current 50A (cold) Efficiency 85% Typical, Full Power varies by model Power Factor 0.95 (Full Power,230V),  0.98(Full Power, 120V) ENVIROMENTAL SPECIFICATIONS Ambient Operating 00C to + 700C     Temperature Range Derating:See Power Rating Chart     Ambient Storage Temp. Range -40oC to +85oC Operating Relative Humidity Range 20-90% non-condensing Altitude 10,000ft. ASL Operating 40,000ft. ASL Non-operating Temperature Coefficient 0.02%/oC Vibration 2.5g, 10Hz.-2KHz per MIL-STD-810F Method 514.5   Shock 20g, peak per MIL-STD-810F Method 516.5  ORDERING INFORMATION   Please specify the following optional features when ordering: C - Chassis                   CO -Cover             RI - Remote Inhibit                 LS - Single Wire Load Sharing                         LSEVB - Load Share Evaluation Board   All specifications are maximum at 25o C unless otherwise stated and are subject to change without notice. CONNECTOR SPECIFICATIONS  AC Input .156 friction lock header mates with Molex 09-50-3031 or equivalent crimp terminal housing with Molex 2478 or equivalent crimp terminal.       DC Output 6-32 screw down terminal mates with #6 ring tongue terminal.(10 in-lb Max)   Power Fail, Load Share,Sense .100 friction lock header mates with Molex 22-55-2081 or equivalant crimp terminal housingwith Molex 71851 or crimp equivalent terminal.   Inhibit,Standby Power .100 friction lock header mates with Molex 22-55-2041 or equivalent crimp terminal housing with Molex 71851 or equivalent crimp terminal.    Ground .187 quick disconnect terminal.

APPLICATIONS INFORMATION

Sufficient area must be provided around power supply to allow natural movement of air to develop in convection cooled applications. 300 linear feet per minute of airflow must be maintained one inch above the top of the heatsinks in any direction in open frame forced air applications. 300 linear feet per minute of airflow must be maintained one inch above and toward any of the three perforated sides of the cover in forced air chassis/cover applications. Generally, adequate cooling is provided when semiconductor case temperatures do not exceed 70 C rise and transformer temperature does not exceed 60 C rise at any specified ambient temperature. This product is intended for use as a professionally installed component within information technology, industrial and medical equipment and is not intended for stand alone operation. Common RF shielding precautions may need to be taken to assure emissions compliance. Refer to operating instructions for additional information. This product includes only one fuse in the input circuit. In consideration of clause 57.6 of UL 60601-1, a second fuse may be required in the end  product. Low forward voltage drop oring diodes must be used in all load sharing applications in 2.5 through 15 Volt models. Oring diodes must be used on 24 through 48 Volt models used in fault tolerant applications but are optional in power boosting applications. Oring diode power dissipation must be subtracted from the maximum output power rating of each model. Current carrying conductors in load sharing applications must be short and symmetrical. Remote sense conductors should be a twisted pair. The use of an appropriately rated low impedance capacitor across the load will increase noise immunity. Refer to Load Share Evaluation Board data sheet (page 58) for additional load share applications information.

10. Remote sense terminals may be used to compensate for cable losses up to 400 mV depending on model. The use of a twisted pair, decoupling  capacitors and an appropriately rated low impedance capacitor connected across the load will increase noise immunity.
11. A load equal to 5% rated output power must be maintained when using standby power option. An external electrolytic capacitor across standby power output may be used to improve transient response.
12. Peak to peak output ripple and noise is measured directly at the output terminals of the power supply, without the use of the probe ground lead or retractable tip, 20 MHz bandwidth.
13. This product was type tested and safety certified using the dielectric strenght test voltages listed in Table V of UL 60601-1. In consideration of Clause 20.4g, care must be taken to insure that the voltage applied to a reinforced insulation does not overstress basic insulation. Secondary to ground capacitors may need to be removed prior to performing a dielectric strenght type test on the end product. It is highly recommended that the DC test Voltages listed in DVB.1, Annex DVB are not exceeded during a production-line dielectric strength test of the assembled end product. Please consult factory for further information.
14. This power supply has been safety approved and final tested using a DC dielectric strength test. Please consult factory before performing an AC dielectric strength test.
15. Maximum screw penetration into bottom chassis mounting holes is .100 inches.
16. Maximum screw penetration into side chassis mounting holes is .188 inches.
17. To comply with emissions specifications, all four mounting hole pads must be electrically connected to a common metal chassis. Chassis/cover option recommended.

Maximum Output Power vs. Ambient Temperature

Derating requirements- The chart above applies to models 1003 through 1008 only. 175 Watts with 300 LFM forced air, open frame. 115 Watts convection cooled, open frame. Derate 10% with chassis and cover. Derate 1.0 Wout / 1 Vin below 100 Vin between 100 Vin and 85 Vin. Use larger of the two deratings when using chassis/cover below 100 Vin. Derate output power linearly to 50% between 50^o C and 70^o C.

TYPICAL LOAD SHARE/REMOTE SENSE APPLICATION