Delta Electronics S48SA manual Output Voltage Adjustment Trim

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Output Voltage Adjustment (TRIM)

To increase or decrease the output voltage set point, the modules may be connected with an external resistor between the TRIM pin and either the Vo+ or Vo -. The TRIM pin should be left open if this feature is not used.

Figure 15: Circuit configuration for trim-down (decrease output voltage)

If the external resistor is connected between the TRIM and Vo- pins, the output voltage set point decreases. The external resistor value required to obtain a percentage of output voltage change Vo% is defined as:

Rtrim down = 1690Vo% 73.1[ΚΩ ]

Ex. When trim-down –10% (5V X 0.9 = 4.5V)

Rtrim down = 169010 73.1 = 95.9[ΚΩ ]

Figure 16: Circuit configuration for trim-up (increase output voltage)

If the external resistor is connected between the TRIM and Vo+the output voltage set point increases. The external resistor value required to obtain a percentage output voltage change Vo% is defined as:

DS_S48SA05006_06022006

Rtrim up =

69(100 + ∆Vo%) 1690

73.1[ΚΩ]

Vo%

 

 

Ex. When trim-up +10% (5V X 1.1 = 5.5V)

Rtrim up = 69(100 +10) 1690 73.1 = 516.9[ΚΩ] 10

Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power.

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Contents Options Technical Specifications ParameterElectrical Characteristics Curves Typical input characteristics at room temperatureTurn-on transient at zero load current 2 ms/div. Top Scope Resistive Load Design Consideration Input Source ImpedanceFeatures Descriptions Output Voltage Adjustment Trim Circuit configuration for trim-down decrease output voltageThermal Derating Thermal Testing SetupThermal Considerations Pick and Place Location Recommended PAD Layout SMDLeaded Sn/Pb Process Recommend TEMP. Profile Lead Free SAC Process Recommend TEMP. ProfileMechanical Drawing SMDPart Numbering System Model List