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0

50

100

150

200

250

300

350

0

10

20

30

40

50

60

70

Ambient Temperature (°C)

Input Voltage (V)

85

100

I

I

300 LFM - OPEN FRAME

CONVECTION - OPEN FRAME

CONVECTION - CHASSIS/COVER

300 LFM - CHASSIS/COVER

NXT-325 SERIES MECHANICAL SPECIFICATIONS

CONNECTOR SPECIFICATIONS

AC Input

0.156 friction lock header mates with

Molex 09-50-3031 or equivalent crimp

terminal housing with Molex 2478 or

equivalent crimp terminal.

DC Output

10-32 screw down terminal mates with

#10 ring tongue terminal. (10 in-lb Max)

Power Fail,

0.100 friction lock header mates with

Load Share,

Molex 22-55-2081 or equivalent crimp

Sense

terminal housing with Molex 71851 or

crimp equivalent terminal.

Inhibit,

0.100 friction lock header mates with

Standby

Molex 22-55-2041 or equivalent crimp

Power

terminal housing with Molex 71851 or

equivalent crimp terminal.

Ground

0.187 quick disconnect terminal.

APPLICATIONS INFORMATION

1. Continuous Output Power must not exceed 350W or maximum power per model listing.

2. 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.

3. Sufficient area must be provided around power supply to allow natural movement of air to

develop in convection-cooled applications.

4. 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.

5. A minimum load of 10% is required on Output 1 to ensure proper regulation of remaining

outputs.

6. This product includes only one fuse in the input circuit. In consideration of clause 8.11.5 of IEC

60601-1:2005, a second fuse may be required in neutral conductor of the end product.

7. 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 (tip-and-barrel method),

20MHz bandwidth.

8. This product was type-tested and safety-certified using the dielectric strength test voltages

listed in Table 6 of IEC 60601-1:2005. In consideration of Clause 8.8.3, care must be taken to

insure that the voltage applied to a reinforced insulation does not overstress different types and

levels of insulation. Primary and secondary-to-ground capacitors may need to be disconnected

prior to performing a dielectric strength test on the power supply or the end product. It is highly

recommended that the DC test voltages listed in DVB.1, Annex DVB of UL 60601-1 1st Edition

are not exceeded during a production-line dielectric strength test of the assembled end product.

Please consult factory for further information.

9. 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.

10. Remote-Sense terminals may be used to compensate for cable losses up to 400mV 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. Maximum screw penetration into bottom chassis mounting holes is 0.100 inches. Maximum

screw penetration into side chassis mounting holes is 0.250 inches.

12. To comply with emissions specifications, all four mounting hole pads must be electrically

connected to a common metal chassis. Chassis/Cover option is recommended. Refer to

Operating Instructions for additional information.

13. Common RF shielding precautions may need to be taken to assure emissions compliance.

Refer to Operating Instructions for additional information.

14. Power Fail (AC-Good) feature provides a logic-low warning signal from an open collector

transistor output 10ms prior to loss of output from AC failure.

15. 300LFM of airflow must be maintained one inch above the top of the heatsinks in any direction

in open-frame forced-air applications; and one inch above and toward any of the three

perforated sides of the cover in forced-air Chassis/Cover applications.

16. Low forward-voltage-drop oring diodes must be used in all load-sharing applications in 2.5

through 15V models. Oring diodes must be used on 24 through 48V 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.

17. Current-carrying conductors in load-sharing applications must be short and symmetrical.

18. Refer to Load-Share Evaluation Board data sheet (page 58) for additional load-share

applications information.

19. 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.

MAX POUT vs. AMBIENT TEMPERATURE/INPUT VOLTAGE

Derating requirements – Chart above applies to models 1004 thru 1008 only. 350W 300LFM

forced air, open frame. 200W convection cooled open frame. Derate 10% with chassis and

cover. Derate 1.5WOUT/1VIN below 100VIN and between 100VIN and 85VIN. Use larger of the two

deratings when using chassis/cover below 100VIN. Derate output power linearly to 50% between

50

 and 70C. Refer to model listing for all ratings.

TYPICAL LOAD SHARE/REMOTE SENSE APPLICATION

INTEGRATED

POWER DESIGNS 300 Stewart Road ■ Wilkes-Barre, PA 18706 ■ Phone: (570) 824-4666 ■ Fax: (570) 824-4843 ■ Email: sales@ipdpower.com ■ Web: www.ipdpower.com