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MIC2297 Datasheet(PDF) 5 Page - Micrel Semiconductor

Part # MIC2297
Description  40V PWM Boost Regulator White LED Driver
PDF  11 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2297 Datasheet(HTML) 5 Page - Micrel Semiconductor

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Micrel
MIC2297
Mach 2008
5
M9999-032708
Typical Characteristics (continued)
35
40
45
50
55
60
65
70
75
80
85
0
102030
40
LED CURRENT (mA)
Efficiency for 10 LEDs
vs. LED Current
VIN = 3.6V
VIN = 3.2V
VIN = 4.2V
L = 15µH
40
45
50
55
60
65
70
75
80
0
5
10 15 20 25 30 35
LED CURRENT (mA)
Efficiency for 9 LEDs
vs. LED Current
L = 6.8µH
VIN = 3.6V
VIN = 3.2V
VIN = 4.2V
35
40
45
50
55
60
65
70
75
80
85
0
5 10 15 20 25 30 35 40
LED CURRENT (mA)
Efficiency for 9 LEDs
vs. LED Current
VIN = 3.6V
VIN = 3.2V
VIN = 4.2V
L = 15µH
0
5
10
15
20
25
30
35
0
20406080
100
DUTY CYCLE (%)
LED Current
vs. Duty Cycle
RSENSE
5V
4V
3V
2V
PWM = 20kHz
2V peak PWM
VIN
EN
REF
BRT
AGND PGND
SW
OVP
COMP
FB
MIC2297BML
C3
0.22µF, 10V
PWM
C4
0.1µF, 10V
C2
0.47µF, 50V
C1
1µF, 16V
L1 = Murata LQH32CN100K11
L1



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