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EV0021 Datasheet(PDF) 7 Page - Monolithic Power Systems

Part # EV0021
Description  High Efficiency White LED Driver
PDF  8 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

EV0021 Datasheet(HTML) 7 Page - Monolithic Power Systems

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



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