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ADDC02805SATV 데이터시트(PDF) 9 Page - Analog Devices |
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ADDC02805SATV 데이터시트(HTML) 9 Page - Analog Devices |
9 / 18 page ADDC02803SC/ADDC02805SA REV. A –9– With regard to the range to which the output voltage can be adjusted by the user, there are two concerns. As the output voltage is raised it may become difficult to maintain regulation at full power and low input voltage. As the output voltage is lowered, it may become difficult to maintain regulation at mini- mum power and high input line. In addition, if the output voltage is reduced below 3 V, the secondary side control circuit may not have a sufficient supply voltage to operate correctly. Pin 4 (STATUS) Pin 4 is active high referenced to –SENSE (Pin 1), indicating that the output voltage is typically within ±5%. The pin is both pulled up and down by internal circuitry. Figures 26, 27 and 28 show the typical source and sink capabilities of the status output. Refer to the paragraphs describing Pin 3 (ADJUST) for effect on status trip point. IOH – mA 3.00 2.25 1.50 0.4 1.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 2.75 2.50 2.00 1.75 Figure 26. Source Capability of Status Output (ADDC02803SC) IOH – mA 4.2 3.8 2.2 0.8 2.6 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 3.4 3.0 2.6 Figure 27. Source Capability of Status Output (ADDC02805SA) IOL – mA 1.0 0.8 0.0 1.0 19.0 4.0 7.0 10.0 13.0 16.0 0.6 0.4 0.2 Figure 28. Sink Capability of Status Output Pin 5 (VAUX) Pin 5 is referenced to the input return and provides a semi- regulated 13 V to 15 V dc voltage supply for miscellaneous system use. The maximum permissible current draw is 5 mA and the voltage varies with the output load of the converter as shown in Figures 29 and 30. OUTPUT CURRENT – A 15.0 14.5 13.0 022 2 4 6 8 10 12 14 16 18 20 14.0 13.5 Figure 29. VAUX vs. Converter Output Current (ADDC02805SA) OUTPUT CURRENT – A 14.0 13.5 11.5 022 2 4 6 8 10 12 14 16 18 20 13.0 12.5 12.0 Figure 30. VAUX vs. Converter Output Current (ADDC02803SC) |
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