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Número de pieza
componentes Descripción
MP1521EQ Ver la hoja de datos (PDF) - Monolithic Power Systems
Número de pieza
componentes Descripción
Fabricante
MP1521EQ
High Efficiency White LED Driver
Monolithic Power Systems
MP1521EQ 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
C
OUT
1uF
3
REF
OLS
8
BRT
4
BRT
FB1
7
5
FB3
FB2
6
L1
47µH
V
IN
C
IN
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)
V
IN
= 5V
V
IN
= 4V
V
IN
= 3V
Line Regulation using
47µH Toko D62CB
25
Inductor
20
15
10
2.5
3
3.5
4
4.5
V
IN
(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
C
OUT
1µF
White LEDs
BRT
4
BRT
FB1
7
C
IN
4.7µF
V
IN
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
V
IN
(V)
V
IN
= 5V
V
IN
= 4V
V
IN
= 3V
MP1521 Rev 2.7 10/06/04
www.monolithicpower.com
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