Delta Electronics S48SE manual Features Descriptions CON, Output Voltage Adjustment

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FEATURES DESCRIPTIONS (CON.)

Output Voltage Adjustment

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.

ON/OFF Vo (-)

Vi (-) Trim

Vi (+)

Vo (+)

R

trim-up

R

Load

ON/OFF Vo (-)

Vi (-) Trim

R

Figure 18: Circuit configuration for trim-up (increase output voltage)

R

Load

If the external resistor is connected between the TRIM and Vo(-) the output voltage set point increases (Fig.

Vi (+)

Vo (+)

trim-down

18). The external resistor value required to obtain an output voltage change from 5V to the desired Vo_adj is defined as:

Figure 17: 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 (Fig. 17). The external resistor value required to obtain an output voltage change from 5V to the desired Vo_adj is defined as:

Rtrim_down

 

 

(Vo_adj − 2.5)⋅5110

− 2050

 

 

5.0 − Vo_adj

 

 

 

 

 

 

 

 

 

 

 

Ex. When Trim-down -10%

 

 

 

Vo_adj=5.0V×(1-10%)=4.5V

 

 

 

Rtrim_down

 

 

(4.5 − 2.5)⋅5110

− 2050

 

 

5.0 − 4.5

 

 

 

 

 

 

 

 

Rtrim_down = 1.839⋅ 104 ohm

DS_S48SE05003_12292006

Rtrim_up

 

 

2.5⋅5110

 

− 2050

 

 

Vo_adj − 5.0

 

Ex. When Trim-up +10%

Vo_adj=5.0V×(1+10%)=5.5V

Rtrim_up

 

 

2.5⋅5110

 

− 2050

 

 

5.5 − 5.0

 

 

 

 

 

Rtrim_up = 2.35⋅ 104 ohm

When using trim function, the output voltage of the module is usually increased, which increases the power output of the module with the same output current.

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 Features Technical Specifications ParameterElectrical Characteristics Curves Typical full load input characteristics at roomElectrical Characteristics Curves CON Scope Design Considerations Input Source ImpedanceFeatures Descriptions Over-Temperature ProtectionOver-Current Protection Remote On/OffFeatures Descriptions CON Output Voltage AdjustmentThermal Testing Setup Thermal ConsiderationsThermal Curves Thermal DeratingPick and Place Location Recommended PAD Layout SMDLeaded Sn/Pb Process Recommend TEMP. Profile Lead Free SAC Process Recommend TEMP. ProfileMechanical Drawing Name FunctionPart Numbering System Model List