BD6590MUV
Technical Note
●Main characteristics of efficiency
Conditions: 10serial 6parallel, LED current=20mA/ch, output capacitor=2.2μF(50V/B3)
100
95
Ta=-40°C
90
85
Ta=85°C
80
Ta=25°C
75
70
65
60
55
50
5
10
15
20
25
30
Coil Power [V]
Efficiency vs duty (10serial x 6strings)
efficiency for PWMPOW Control
Coil Power=12V Ta=25℃
100.0%
90.0%
80.0%
70.0%
60.0%
50.0%
40.0%
30.0%
20.0%
10.0%
0.0%
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0
10 20 30 40 50 60 70 80 90 100
PWM Duty(%)
0
10 20 30 40 50 60 70 80 90 100
PWM Duty[%]
Efficiency of current driver PWM
Efficiency of power control PWM
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2011.07 - Rev.B
14/26