поискавой системы для электроныых деталей |
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S-19243XXXH датащи(PDF) 33 Page - ABLIC Inc. |
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S-19243XXXH датащи(HTML) 33 Page - ABLIC Inc. |
33 / 74 page AUTOMOTIVE, 105°C OPERATION, 10 V INPUT, 500 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION Rev.3.2_00 S-19243xxxH Series 33 9. Types in which output voltage is externally set The S-19243xxxH Series provides the types in which output voltage can be set via the external resistor. The output voltage can be set by connecting a resistor (Ra) between the VOUT pin and the VADJ pin, and a resistor (Rb) between the VADJ pin and the VSS pin. The output voltage is determined by the following formulas. VOUT = 1.0 + Ra × la ···················· (1) By substituting Ia = IVADJ + 1.0 / Rb to above formula (1), VOUT = 1.0 + Ra × (IVADJ + 1.0 / Rb) = 1.0 × (1.0 + Ra / Rb) + Ra × IVADJ ······· (2) In above formula (2), Ra × IVADJ is a factor for the output voltage error. Whether the output voltage error is minute is judged depending on the following (3) formula. By substituting IVADJ = 1.0 / RVADJ to Ra × IVADJ VOUT = 1.0 × (1.0 + Ra / Rb) + 1.0 × Ra / RVADJ ················ (3) If RVADJ is sufficiently larger than Ra, the error is judged as minute. VSS VOUT VIN VADJ VOUT Ra Rb Ia Ib RVADJ IVADJ 1.0 V Figure 34 The following expression is in order to determine VOUT = 6.0 V. If Rb = 2 k Ω, substitute RVADJ = 600 kΩ typ. into (3), Ra = (6.0 / 1.0 − 1) × ((2 k × 600 k) / (2 k + 600 k)) ≅ 9.97 kΩ Caution The above connection diagrams and constants will not guarantee successful operation. Perform thorough evaluation using the actual application to set the constants. |
Аналогичный номер детали - S-19243XXXH |
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Аналогичное описание - S-19243XXXH |
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