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## EQD075A1 Datasheet(PDF) 11 Page - Lineage Power Corporation

 Part No. EQD075A1 Description 18-60Vdc Input; 3.3 to 5.0Vdc Output; 75W Download 15 Pages Scroll/Zoom 100% Maker LINEAGEPOWER [Lineage Power Corporation] Homepage http://www.lineagepower.com Logo

## EQD075A1 Datasheet(HTML) 11 Page - Lineage Power Corporation

 11 / 15 page Data SheetMarch 25, 2008EQD075 Series Single Output: Eighth Brick Power Modules:18-60Vdc Input; 3.3 to 5.0Vdc Output; 75W11Feature Descriptions (continued)Output Voltage ProgrammingThe output voltage is adjustable between 3.0 to 5.5V(A version). A resistor placed between the Trim pinand Sense (+) increases the output voltage and aresistor placed between the Trim pin and Sense (-)decreases the output voltage. Figure 22 shows thecircuit configuration using an external resistor. Thetrim resistor should be positioned close to the module.If the trim pin is not used then the pin shall be leftopen. If no trim resistor is connected, for the Aversion, the output voltage will be 5V.The following equations determine the requiredexternal resistor value to obtain a percentage outputvoltage change of Δ%.To decrease output voltage set point:Ω⎟⎠⎞⎜⎝⎛−Δ=−KRdowntrim2.10%510Where,100%,,×−=ΔnomodesirednomoVVVVdesired = Desired output voltage set point (V).To increase the output voltage set point()Ω⎟⎠⎞⎜⎝⎛−Δ−ΔΔ+=−KVRnomouptrim2.10%510%*225.1%100**1.5,Although the output voltage can be increased by boththe remote sense and by the trim, the maximumincrease for the output voltage is not the sum of both.The maximum absolute increase in output voltage,due to simultaneous remote sense and trimincreases, shall not exceed the larger of the specifiedindividual remote sense or trim maximum limits shownin the Features Specifications table.VO(+)TRIMVO(-)Rtrim-downLOADVIN(+)ON/OFFVIN(-)Rtrim-upSENSE (+)SENSE (-)Figure 22. Circuit Configuration to program outputvoltage using an external resistor.Pre-Bias ImmunityThe modules are able to start into a pre-biased outputwith a monotonic rise of the output voltage. Duringshutdown an internal feature implemented in themodule ensures there will be no reverse current.Thermal ConsiderationsPower modules operate in a variety of thermalenvironments; however, sufficient cooling should beprovided to help ensure reliable operation.Considerations include ambient temperature, airflow,module power dissipation, and the need for increasedreliability. A reduction in the operating temperature ofthe module will result in an increase in reliability. Thethermal data is based on physical measurementstaken in a wind tunnel. The test set-up is shown inFigure 23.The thermal reference point, Tref, used in thespecifications is shown in Figure 24. For reliableoperation, this temperature should not exceed 125OC.Please refer to the Application Note “ThermalCharacterization Process For Open-Frame Board-Mounted Power Modules” for a detailed discussion ofthermal aspects including maximum devicetemperatures.Figure 24. Tref Temperature MeasurementLocation.AirflowxPower ModuleWind TunnelPWBs6.55_(0.258)76.2_(3.0)Probe Locationfor measuringairflow andambienttemperature25.4_(1.0)Figure 23. Thermal Test Set up.Tref