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| ISL62391_11 Datasheet, PDF (9/20 Pages) Intersil Corporation – High-Efficiency, Triple-Output System Power Supply Controller | |||
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ISL62391, ISL62392, ISL62391C, ISL62392C
Typical Performance Curves
100
VIN = 7V
95
90
85
VIN = 12V
80
VIN = 19V
75
70
65
60
55
50
0.10
1.00
IOUT (A)
10.00
FIGURE 5. CHANNEL 1 EFFICIENCY AT VO = 3.3V, DEM
OPERATION. HIGH-SIDE 1xIRF7821,
rDS(ON) = 9.1mΩ; LOW-SIDE 1xIRF7832,
rDS(ON) = 4mΩ; L = 4.7µH, DCR = 14.3mΩ; CCM
FSW = 270kHz
100
95
VIN = 7V
90
85
VIN = 12V
80
VIN = 19V
75
70
65
60
55
50
0.01
0.10
IOUT (A)
1.00
10.00
FIGURE 6. CHANNEL 2 EFFICIENCY AT VO = 5V, DEM
OPERATION. HIGH-SIDE 1xIRF7821,
rDS(ON) = 9.1mΩ; LOW-SIDE 1xIRF7832,
rDS(ON) = 4mΩ; L = 4.7µH, DCR = 14.3mΩ; CCM
FSW = 330kHz
VO1
FB1
PGOOD
PHASE1
VO1
FB1
PGOOD
PHASE1
FIGURE 7. POWER-ON, VIN = 12V, LOAD = 5A, VO = 3.3V
FIGURE 8. POWER-OFF, VIN = 12V, IO = 5A, VO = 3.3V
VO1
FB1
PGOOD
EN1
FIGURE 9. ENABLE CONTROL, EN1 = HIGH, VIN = 12V,
VO = 3.3V, IO = 5A
9
VO1
FB1
PGOOD
EN1
FIGURE 10. ENABLE CONTROL, EN1 = LOW, VIN = 12V,
VO = 3.3V, IO = 5A
FN6666.5
April 7, 2011
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