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EV0021 Datasheet(PDF) 6 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) 6 Page - Monolithic Power Systems

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



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