MIC2297(2005) データシートの表示（PDF） - Micrel
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MIC2297 Datasheet PDF : 12 Pages
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Micrel
MIC2297
Typical Characteristics (continued)
Efficiency for 10 LEDs
vs. LED Current
85
80
VIN = 4.2V
75
70
VIN = 3.2V VIN = 3.6V
65
60
55
50
45
40
L = 15µH
350
10
20
30
40
LED CURRENT (mA)
Efficiency for 9 LEDs
vs. LED Current
80
VIN = 4.2V
75
70
VIN = 3.6V
VIN = 3.2V
65
60
55
50
45
L = 6.8µH
400 5 10 15 20 25 30 35
LED CURRENT (mA)
Efficiency for 9 LEDs
vs. LED Current
85
80
VIN = 4.2V
75
70
VIN = 3.2V VIN = 3.6V
65
60
55
50
45
40
L = 15µH
350 5 10 15 20 25 30 35 40
LED CURRENT (mA)
LED Current
vs. Duty Cycle
35
30
4V
5V
3V 2V
25
20
2V peak PWM
15
10
5
PWM = 20kHz
RSENSE
0
0 20 40 60 80 100
DUTY CYCLE (%)
L1 = Murata LQH32CN100K11
L1
C1
1µF, 16V
C3
0.22µF, 10V
PWM
VIN
SW
EN
OVP
MIC2297BML
REF
COMP
BRT
AGND PGND FB
C4
0.1µF, 10V
C2
0.47µF, 50V
May 2005
6
M9999-050305
(408) 955-1690
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