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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC190DEVB датащи(PDF) 11 Page - Semtech Corporation |
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SC190DEVB датащи(HTML) 11 Page - Semtech Corporation |
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11 / 18 page  11 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC190 CIN Selection The source input current to the SC190 buck converter is a DC supply current with a triangular ripple riding on it. To prevent large input voltage ripple a low ESR ceramic capacitor is required. A minimum value of 4.7µF should be used for sufficient input voltage filtering and a 10µF MLCC should be used for optimum input voltage filtering. Input voltage ripple of approximately 1mV can be achieved when C IN = 10µF, and the front-end LDO regulator is active and pre-regulating the input supply to the switching regulator. (See page 12: Input Voltage Ripple graphs). COUT Selection A 10µF ceramic capacitor is recommended for the output filter capacitor. Output voltage ripple is dominated by the filter capacitance as shown in the following equation: Choose an X7R or X5R ceramic dielectric for low ESR and superior temperature and voltage characteristics. Do not use Y5V capacitors - their temperature coefficients make them impractical for this application. Table 3: Recommended Capacitors Manufacturer Part Number Value (µF) Rated Voltage (VDC) Type Case Size Murata GRM188R60J475KE19D 4.7 6.3 X5R 0603 Murata GRM188R60G106ME47D 10 4 X5R 0603 TDK C1608X5ROG106M 10 4 X5R 0603 Applications Information (Cont.) ) ESR ( Cout ) ripple ( IL ripple _ Vout • ∆ = |
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