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ISL6219 Datasheet(PDF) 16 Page - Intersil Corporation |
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ISL6219 Datasheet(HTML) 16 Page - Intersil Corporation |
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16 / 17 page  16 page 3). Figure 13 and Equation 23 are provided to assist in the selecting the correct value for RT. Input Capacitor Selection The input capacitors are responsible for sourcing the ac component of the input current flowing into the upper MOSFETs. Their rms current capacity must be sufficient to handle the ac component of the current drawn by the upper MOSFETs which is related to duty cycle and the number of active phases. Figures 14 and 15 can be used to determine the input- capacitor rms current as of duty cycle, maximum sustained output current (IO), and the ratio of the combined peak-to- peak inductor current (IL,PP) to IO. Figure 16 is provided as a reference to demonstrate the dramatic reductions in input- capacitor rms current upon the implementation of the multiphase topology. RT 10 11.09 1.13 fS () log – [] = (EQ. 23) FIGURE 13. RT VS SWITCHING FREQUENCY 100 1000 10000 10 SWITCHING FREQUENCY (KHZ) 10 100 1000 0.3 0.1 0 0.2 FIGURE 14. NORMALIZED INPUT-CAPACITOR RMS CURRENT VS DUTY CYCLE FOR 2-PHASE 00.4 1.0 0.2 0.6 0.8 DUTY CYCLE (VO /VIN ) IPP = 0 IPP = 0.5 IO IPP = 0.75 IO DUTY CYCLE (VIN / VO) FIGURE 15. NORMALIZED INPUT-CAPACITOR RMS CURRENT VS DUTY CYCLE FOR 3-PHASE 00.4 1.0 0.2 0.6 0.8 0.3 0.1 0 0.2 IPP = 0 IPP = 0.25 IO IPP = 0.5 IO IPP = 0.75 IO FIGURE 16. NORMALIZED INPUT-CAPACITOR RMS CURRENT VS DUTY CYCLE FOR SINGLE-PHASE CONVERTER 00.4 1.0 0.2 0.6 0.8 DUTY CYCLE (VIN / VO) 0.6 0.2 0 0.4 IPP = 0 IPP = 0.5 IO IPP = 0.75 IO ISL6219 |
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