EV0021 データシートの表示（PDF） - Monolithic Power Systems
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EV0021 Datasheet PDF : 8 Pages
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Monolithic Power Systems
MP1521
High Efficiency
White LED Driver
Application Circuits Continued
Figure 5: Two Strings of Four (4) LEDs or Eight (8) LEDs Total
ON
EN
OFF
1 IN
MP1521
2 EN
SW 10
GND 9
D1, B130
COUT
1uF
3 REF
OLS 8
BRT
4 BRT
FB1 7
5 FB3
FB2 6
L1
47µH
VIN
CIN
4.7µF
GND
White LEDs
20
20
Efficiency vs LED current using
47µH Toko D62CB Inductor
90
80
70
60
50
5
15 25 35 45
Total LED Current (mA)
VIN = 5V
VIN = 4V
VIN = 3V
Line Regulation using
47µH Toko D62CB
25
Inductor
20
15
10
2.5
3
3.5
4
4.5
VIN (V)
Figure 6: Three Strings of Three (3) LEDs or Nine (9) LEDs Total
L1
47µH
ON
EN
OFF
1 IN
MP1521
2 EN
SW 10
GND 9
3 REF
OLS 8
D1, B130
COUT
1µF
White LEDs
BRT
4 BRT
FB1 7
CIN
4.7µF
VIN
GND
5 FB3
FB2 6
20 20
20
Efficiency vs LED current using
47µH Toko D62CB Inductor
100
90
80
70
60
50
0
20
40
60
80
LED current (mA)
Line regulation using
47µH Toko D62CB Inductor
22
20
18
16
1.4 2.0
2.
3.0 3.6 4.2
6 VIN (V)
VIN = 5V
VIN = 4V
VIN = 3V
MP1521 Rev 2.7 10/06/04
www.monolithicpower.com
7
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