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T48SR05005NNFA Datasheet(PDF) 9 Page - Delta Electronics, Inc. |
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T48SR05005NNFA Datasheet(HTML) 9 Page - Delta Electronics, Inc. |
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9 / 12 page  DS_ T48SR3R307_10162012 9 FEATURES DESCRIPTIONS (CON.) This limit includes any increase in voltage due to remote sense compensation and output voltage set point adjustment (trim). Vi(-) Vi(+) Vo(-) Vo(+) Sense(+) Sense(-) Resistance Contact Contact and Distribution Losses Figure 20: Effective circuit configuration for remote sense operation If the remote sense feature is not used to regulate the output at the point of load, please connect SENSE(+) to Vo(+) and SENSE(–) to Vo(–) at the module. The output voltage can be increased by both the remote sense and the trim; however, the maximum increase is the larger of either the remote sense or the trim, not the sum of both. When using remote sense and trim, 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 does not exceed the maximum rated power. 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 SENSE(+) or SENSE(-). The TRIM pin should be left open if this feature is not used. Figure 21: Circuit configuration for trim-down (decrease output voltage) If the external resistor is connected between the TRIM and SENSE (-) pins, the output voltage set point decreases (Fig.18). The external resistor value required to obtain a percentage of output voltage change △% is defined as: () Ω − ∆ = − K down Rtrim 2 . 10 511 Ex. When Trim-down -20 %( 3.3V×0.8=2.64V) () Ω = − = − K down Rtrim 4 . 15 2 . 10 20 511 Figure 22: Circuit configuration for trim-up (increase output voltage) If the external resistor is connected between the TRIM and SENSE (+) the output voltage set point increases (Fig. 19). The external resistor value required to obtain a percentage output voltage change △% is defined as: Rtrim_up 865.7 ∆ 3.547 + K Ω Ex. When Trim-up +10%(3.3V×1.1=3.63V) Rtrim_up 865.7 10 3.547 + 90.117K Ω The output voltage can be increased by both the remote sense and the trim, however the maximum increase is the larger of either the remote sense or the trim, not the sum of both. When using remote sense and trim, 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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