CM9320 Datasheet, PDF (5/10 Pages) California Micro Devices Corp – Asymmetrical High Efficiency Two Channel Boost LED Driver

PRELIMINARY
CM9320
Typical Performance Curves
ILED vs. VIN
21.2
21.0
ILED1
20.8
20.6
20.4
20.2
20.0
19.8
ILED2
19.6
19.4
L = 4.7uH
19.2
4 WLED/ch
TA = 25 ºC
19.0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VIN (V)
EFFICIENCY v.s VIN
90
85
ILED vs. VIN (high currents)
120
110
L=10uH, 3W+4W, 60mA+40mA
100
L=10uH, 4W+4W, 50mA+40mA
90
80
L=4.7uH, 4W+4W, 40mA+40mA
70
60
No-Interleave
TA = 25 ºC
50
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VIN (V)
EFFICIENCY vs. ILED
90
Vin=5.6V
85
4.2V
80
3.6V
3.0V
2.7V
75
80
70
ILED1,2 = 20mA
L = 4.7uH
4 WLED/ch
75
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VIN (V)
65
60
0
L = 4.7uH
4 WLED/ch
TA = 25 ºC
5
10
15
20
25
30
35
ILED (m A)
EFFICIENCY vs. INDUCTOR
90
L=4.7uH
L=3.3uH
85
L=2.7uH
L=1.5uH
80
75
L=10uH
L=15uH
70
ILED1,2 = 20 mA
4 WLED/ch
TA = 25 ºC
65
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VIN (V)
EFFICIENCY vs. STRING CONFIGURATION
90
88
ILED=20mA+20mA
86
84
82
ILED=5mA+20mA
ILED=20mA+5mA
80
78
L = 4.7uH
76
CH1,2 = 4W+3W
TA = 25 ºC
74
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VIN (V)
© 2006 California Micro Devices Corp. All rights reserved.
05/08/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: [phone] l Fax: [phone] l www.cmd.com
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