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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN2808 데이터시트(PDF) 13 Page - STMicroelectronics |
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AN2808 데이터시트(HTML) 13 Page - STMicroelectronics |
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13 / 40 page  AN2808 Configuration 13/40 7 Configuration The PM6670S board includes four jumpers (JP1, JP2, JP3 and JP5) and two resistors, which can be configured to select the desired mode of operation. 7.1 JP3 fixed or adjustable output voltage (mode pin) The JP3 jumper is used to choose between a fixed output voltage (1.5 or 1.8 V) and a user-defined output voltage in the range of 0.9 to 2.6 V. When connected in the lower position, the fixed output voltage is selected and the voltage depends on the setting of the DDRSEL pin (Section 7.2). If JP3 is in the upper position, the output voltage is given by: Equation 1 Figure 9. JP3 (mode) setting Both the R8 and R9 resistors are set to 39 k Ω (1.8 V by default) and can be changed by the user. VDDQ ADJ 0.9 R8 R9 + R8 ---------------------- ⋅ = |
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