MIC3203 Datasheet, PDF (5/21 Pages) Micrel Semiconductor – High-Brightness LED Driver Controller with High-Side Current Sense

Micrel, Inc.
Typical Characteristics
Efficiency
vs. Input Voltage
100
90
80
4LED
6LED
8LED
70
10LED
L=150µH
ILED=1A
60
0 5 10 15 20 25 30 35 40 45
INPUT VOLTAGE (V)
Normalized LED Currents
vs Input Voltage
1.03
L=68µH
ILED=1A
1.02
1.01
1
1LED
0.99
2LED
4LED
0.98
6LED 8LED _10LED
0.97
0 5 10 15 20 25 30 35 40 45
INPUT VOLTAGE (V)
Duty Cycle
vs. Input Voltage
100
75
50 ^1LED
2LED
4LED
25
6LED
8LED
0
05
L=150µH
ILED=1A
10 15 20 25 30
INPUT VOLTAGE (V)
10LED
35 40 45
Efficiency
vs Input Voltage
100
90
80
4LED
6LED
70
8LED
10LED
60
0
L=68µH
ILED=1A
5 10 15 20 25 30 35 40 45
INPUT VOLTAGE (V)
Frequency
vs. Input Voltage
350
L=150µH
ILED=1A
300
250
4LED
200
150
2LED
100
1LED
50
0
0
6LED
10LED
8LED
5 10 15 20 25 30 35 40 45
INPUT VOLTAGE (V)
Duty Cycle
vs Input Voltage
100
75
50 1LED
2LED
4LED
25
6LED
8LED
0
05
L=68µH
ILED=1A
10 15 20 25 30
INPUT VOLTAGE (V)
10LED
35 40 45
MIC3203
Normalized LED Currents
vs. Input Voltage
1.03
L=150µH
ILED=1A
1.02
1.01
1LED ^{2LED 4LED 6LED}
1
10LED
8LED
0.99
0.98
0.97
0
5 10 15 20 25 30 35 40 45
INPUT VOLTAGE (V)
Frequency
vs Input Voltage
700
L = 68µH
ILED = 1A
600
4LED
500
400
2LED
300
200
1LED
100
0
0
6LED
8LED
10LED
5 10 15 20 25 30 35 40 45
INPUT VOLTAGE (V)
Supply Current
vs. Input Voltage
1.4
1.2
1.0
TA = 25°C
ILED = 0A
0.8
0.6
0.4
0.2
0.0
0
5 10 15 20 25 30 35 40 45
INPUT VOLTAGE (V)
March 2010
5
M9999-032910-A