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QSB60048S12 Datasheet(PDF) 5 Page - XP Power Limited |
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QSB60048S12 Datasheet(HTML) 5 Page - XP Power Limited |
5 / 10 page xppower.com 5 Output Voltage Adjustment Figure 3. Test and output voltage trim configuration Parallel Configuration Load +S +V -V -S PC +S +V -V -S PC Figure 4. Parallel configuration for current sharing Notes. Up to 4 converters to share within 90% max power. The trim pin permits the user to adjust the output voltage up or down according to the trim range specification (40% to 110% of nominal output). This is accomplished by connecting resistor Rv between the +Vout and +Sense pins and a resistor Rtrim between the trim and - Sense pins. The trim pin should be left open if trimming is not being used. The trim resistor can be determined by the following equations: The capacitor C1 is recommended to be low ESR and is to balance the line indunctance on the input of the DC/DC converter. For stable operation, connect a low impedance electrolytic capacitor C2 in the output terminals. When operated at lower temperature than -20 °C, increasing the C2 capacitance with three or four times more than the recommended value. Rtrim: KΩ, 6.2 kΩ recommended Vo: Nominal Output Voltage : Variable Resistor, KΩ Rv (Vo + R ) x Vf v Vtrim = Rtrim x 33 Rtrim + 33 1.24 x Vf = Rtrim x 33 Rtrim + 33 7.68 + DC C1 R1 +Vin -Vin +SNS Rtrim C2 Load +Vout -Vout -SNS TRIM +On/Off C1: 220 µF/100 V C2: 470 µF/100 V Low ESR electrolytic capacitors are recommended -On/Off v Rv |
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