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ISL6219A Datasheet(PDF) 16 Page - Intersil Corporation

Part No. ISL6219A
Description  Microprocessor CORE Voltage Regulator Precision Multi-Phase BUCK PWM Controller for Mobile Applications
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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ISL6219A Datasheet(HTML) 16 Page - Intersil Corporation

 
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16
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.
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
ISL6219A


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