ISL97682 データシートの表示（PDF） - Intersil
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ISL97682 Datasheet PDF : 17 Pages
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ISL97682, ISL97683, ISL97684
Typical Performance Curves
90
80
70
60
50
40
4.2VIN
30
3.7VIN
20
3VIN
10
0
0
20
40
60
80
100
DC (%)
FIGURE 3. ISL97683 TYPICAL EFFICIENCY FOR 3V TO 4.2V IN A
3P7S, ILED = 20mA/CH SINGLE SUPPLY
CONFIGURATION AT FSW = 600kHz IN PWM MODE
85
80
75
70
65
3.7VIN
4.2VIN
60
55
3VIN
50
0
20
40
60
80
100
DC (%)
FIGURE 4. ISL97683 TYPICAL EFFICIENCY FOR 3V TO 4.2V IN A
3P7S, ILED = 20mA/CH CONFIGURATION AT
FSW = 600kHz IN PWM MODE WITH VIN SUPPLY = 5V
90
80
70
5V
60
50
0
50
100
DC (%)
FIGURE 5. ISL97683 TYPICAL EFFICIENCY FOR 5VIN IN A 3P7S,
ILED = 20mA/CH CONFIGURATION AT FSW = 600kHz
IN PWM MODE
95
90
85
80
600k PWM
75
70
0
5
10
15
20
25
30
DC (%)
FIGURE 6. ISL97684 EFFICIENCY FOR 4P10S AT 20mA/CH AT
600kHz IN PWM MODE
93
88
83
78
73
1000k PFM VIN = 15V
68
63
1000k PWM VIN = 15V
58
0 10 20 30 40 50 60 70 80 90 100
DC (%)
FIGURE 7. ISL97864 PWM vs PFM EFFICIENCY vs DC AT
VIN = 15V IN4P8S CONFIGURATION
87
86
85
84
83
0
1000k PWM 50%
1000k PFM 50%
10
20
30
FIGURE 8. PFM vs PFM MODE FOR 4P8S vs VIN AT 1MHz
7
FN7689.0
March 11, 2011
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