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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS1310 датащи(PDF) 23 Page - ams AG |
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AS1310 датащи(HTML) 23 Page - ams AG |
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23 / 30 page  ams Datasheet Page 23 [v1-11] 2015-Jan-28 Document Feedback AS1310 − Application Information Capacitor Selection The convertor requires three capacitors. Ceramic X5R or X7R types will minimize ESL and ESR while maintaining capacitance at rated voltage over temperature. The VIN capacitor should be 22μF. The VOUT capacitor should be between 22μF and 47μF. A larger output capacitor should be used if lower peak to peak output voltage ripple is desired. A larger output capacitor will also improve load regulation on VOUT. See Figure 23 for a list of capacitors for input and output capacitor selection. Figure 23: Recommended Input and Output Capacitors On the pin REF a 10nF capacitor with an Insulation resistance >1G Ω is recommended. Figure 24: Recommended Capacitors for REF Layout Considerations Relatively high peak currents of 480mA (max) circulate during normal operation of the AS1310. Long printed circuit tracks can generate additional ripple and noise that mask correct operation and prove difficult to “de-bug” during production testing. Referring to Figure 2, the input loop formed by C1, VIN and GND pins should be minimized. Similarly, the output loop formed by C2, VOUT and GND should also be minimized. Ideally both loops should connect to GND in a “star” fashion. Finally, it is important to return CREF to the GND pin directly. Part Number C TC Code Rated Voltage Dimensions (L/W/T) Manufacturer GRM21BR60J226ME99 22μF X5R 6.3V 0805, T=1.25mm Murata www.murata.com GRM31CR61C226KE15 22μF X5R 16V 1206, T=1.6mm GRM31CR60J475KA01 47μF X5R 6.3V 1206, T=1.6mm Part Number C TC Code Insulation Resistance Rated Voltage Dimensions (L/W/T) Manufacturer GRM188R71C104KA01 100nF X7R >5G Ω 16V 0603, T=0.8mm Murata www.murata.com GRM31CR61C226KE15 100nF X7R >5G Ω 50V 0805, T=1.25mm |
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