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AP2201K2.6TRE1 Datasheet(PDF) 10 Page - BCD Semiconductor Manufacturing Limited |
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AP2201K2.6TRE1 Datasheet(HTML) 10 Page - BCD Semiconductor Manufacturing Limited |
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10 / 12 page  150mA RF ULDO REGULATOR AP2201 Preliminary Datasheet 10 Jun. 2005 Rev. 1. 0 BCD Semiconductor Manufacturing Limited Application Information External Capacitors The AP2201 requires external capacitors for regula- tor stability. These capacitors must be correctly selected for good performance. Input Capacitor If there is more than 10 inches of wire between the input and the AC filter or if a battery is used as the input, at least a 1 µF capacitor should be placed from IN to GND. Output Capacitor It is required to prevent oscillation. 1.0 µF minimum is recommended when CBYP is not used. 2.2µF mini- mum is recommended when CBYP is 470pF. The out- put capacitor may be increased without limit for large values to improve transient response. The output capacitor should have an ESR of about 5Ω or less. In most cases, tantalum or aluminium electrolytic capacitors are adequate. Noise Bypass Capacitor Bypass capacitor is connected to the internal voltage reference. A 680pF capacitor connected from BYP to GND make this reference quiet, resulting in a significant reduction in output noise. When using CBYP, output capacitors of 2.2µF or greater are required for better stability. The start-up speed of the AP2201 is inversely proportional to the value of reference bypass capacitor. In some cases if output noise is not a major concern and rapid turn-on is necessary, omit CBYP and leave BYP open. |
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Similar Description - AP2201K2.6TRE1 |
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