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SRAH-03C180 Datasheet(PDF) 5 Page - Bel Fuse Inc. |
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SRAH-03C180 Datasheet(HTML) 5 Page - Bel Fuse Inc. |
5 / 9 page Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com NON-ISOLATED DC/DC CONVERTERS 3.3 Vdc Input 0.9 Vdc - 2.5 Vdc/3 A Output Output Trim Equations Equations for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) and the nominal output voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of the resistors should be used for any given application. B V V A R adj nom trimdown − − = D V V C R nom adj trimup − − = Vnom A B C D Notes 0.9 - 2.5 N/A N/A 3.712 1.54 Vo=0.9 V when Rtrim is open 2.5 7.9117 16.14 3.712 11.5 Vo=2.505 V when Rtrim is open 1.8 4.6538 20.84 3.712 16.2 Vo=1.803 V when Rtrim is open 1.5 3.2633 16.14 3.712 11.5 Vo=1.503 V when Rtrim is open 1.2 1.8699 11.45 3.712 6.81 Vo=1.203 V when Rtrim is open 0.9 N/A N/A 3.712 33.2 Vo=0.903 V when Rtrim is open Module Vout Trim GND Rtrimdown Module Vout Trim GND Rtrimup |
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