EV0005 データシートの表示（PDF） - Monolithic Power Systems
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EV0005 Datasheet PDF : 8 Pages
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Monolithic Power Systems
Application Circuits
Figure 3: One String of Four (4) LEDs
MP1521
High Efficiency
White LED Driver
ON
EN
OFF
1 IN
SW 10
MP1521
2 EN
GND 9
3 REF
OLS 8
D1, B130
COUT
1µF
BRT 4 BRT
FB1 7
5 FB3
FB2 6
L
47µH
VIN
CIN
4.7µF
GND
White LEDs
20
Efficiency vs LED current using
47µH Toko D62CB Inductor
90
85
80
75
5
22
21
20
19
18
17
16
15
2.4
10
15
20
LED Current mA
Line regulation using
47µH Toko D62CB Inductor
3.0
3.6
VIN (V)
VIN = 4V
VIN = 3V
4.2
Figure 4: One String of Six (6) LEDs (Low inductor height for portables)
1 IN
L1
D1, B130
SW 10
ON
MP1521
COUT
1µF
EN 2 EN
OFF
GND 9
3 REF
OLS 8
BRT 4 BRT
FB1 7
White LEDs
5 FB3
FB2 6
20
VIN
CIN
4.7µF
GND
Efficiency vs VIN using 1.2mm High
Sumida CMD4D11 Inductor
85
80
75
70
2.5
3
3.5
4
4.5
VIN (V)
6.8µH
10µH
15µH
Line regulation using 1.2mm High
Sumida CMD4D11 Inductor
23.0
21.0
19.0
17.0
15.0
2.5
3
3.5
4
4.5
VIN (V)
6.8µH
10µH
15µH
MP1521 Rev 2.7 10/06/04
www.monolithicpower.com
6
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