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NCV51411PWR2G Datasheet(PDF) 11 Page - ON Semiconductor |
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NCV51411PWR2G Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 16 page NCV51411 http://onsemi.com 11 physically large, and not used in applications where the size, and especially height is the major concern. Ceramic capacitors are now available in values over 10 mF. Since the ceramic capacitor has low ESR and ESL, a single ceramic capacitor can be adequate for both low frequency and high frequency noises. The disadvantage of ceramic capacitors are their high cost. Solid tantalum capacitors can have low ESR and small size. However, the reliability of the tantalum capacitor is always a concern in the application where the capacitor may experience surge current. Output Capacitor In a buck converter, the requirements on the output capacitor are not as critical as those on the input capacitor. The current to the output capacitor comes from the inductor and thus is triangular. In most applications, this makes the RMS ripple current not an issue in selecting output capacitors. The output ripple voltage is the sum of a triangular wave caused by ripple current flowing through ESR, and a square wave due to ESL. Capacitive reactance is assumed to be small compared to ESR and ESL. The peak to peak ripple current of the inductor is: IP * P + VO(VIN * VO) (VIN)(L)(fS) VRIPPLE(ESR), the output ripple due to the ESR, is equal to the product of IP−P and ESR. The voltage developed across the ESL is proportional to the di/dt of the output capacitor. It is realized that the di/dt of the output capacitor is the same as the di/dt of the inductor current. Therefore, when the switch turns on, the di/dt is equal to (VIN − VO)/L, and it becomes VO/L when the switch turns off. The total ripple voltage induced by ESL can then be derived from VRIPPLE(ESL) + ESL( VIN L ) ) ESL( VIN * VO L ) + ESL( VIN L ) The total output ripple is the sum of the VRIPPLE(ESR) and VRIPPLE(ESR). Figure 13. The Output Voltage Ripple Using Two 10 mF Ceramic Capacitors in Parallel Figure 14. The Output Voltage Ripple Using One 100 mF POSCAP Capacitor Figure 15. The Output Voltage Ripple Using One 100 mF OS−CON Figure 16. The Output Voltage Ripple Using One 100 mF Tantalum Capacitor |
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