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BD6066GU,BU6066EKN
Technical Note
100
25
2
90
25 ℃
ISET=27k ?
ISET=27k ?
80
70
60
85 ℃
-30 ℃
20
15
1.5
16V
50
40
10
6V, 7.4V, 10.7V, 22V
1
22V
30
20
5
16V
0.5
10.7V
6V
7.4V
10
0
0
0
0
5
10 15
20
25
0
20
40 60
80
100
2
4
6
8 10 12 14 16
18
20
VBAT[V]
Fig.13
Efficiency - source voltage
PWM-HI Duty [ ％ ]
Fig.14
LED current - PWM HI Duty
PWM = 200Hz
PWM-HI Duty [ ％ ]
Fig.15
LED current - PWM HI Duty( Expansion)
PWM = 200Hz
25
20
VBAT=7.4V
ISET=27k ?
2
VBAT=7.4V
ISET=27k ?
85 ℃
100
90
80
VBAT=7.4V
ISET=27k ?
1.5
70
15
25 ℃
25 ℃
60
10
-30 ℃
1
50
40
30
VF Dispersion of
LED line interval is 2.6V.
5
85 ℃
0.5
-30 ℃
20
10
VF Dispersion of LED
line interval is small.
0
0
0
20
40 60
PWM-HI Duty [%]
80
100
0
0
2
4
6 8 10 12 14 16 18 20
PWM-HI Duty [%]
-10
0
20
40 60
PWM-HI Duty [%]
80
100
50
Fig.16
LED current - PWM HI Duty
PWM = 200Hz
Fig.17
LED current - PWM HI Duty( Expansion)
PWM = 200Hz
100%
Fig.18
LED current matching - PWM HI Duty
PWM = 200Hz
50%
40
30
20
10
0
VBAT=7.4V
ISET=27k ?
VF Dispersion of
LED line interval is 2.6V.
VF Dispersion of
LED line interval
is small.
90%
80%
70%
60%
50%
40%
30%
20%
10%
6V
7.4V
10.7V
16V
22V
40%
30%
20%
10%
0%
6V
7.4V
10.7V
22V
0%
16V
-10
0 5 10 15 20 25 30
Duty [%]
Fig.19
LED current matching - PWM HI Duty
(Expansion) PWM = 200Hz
Output
10V/div
Average current = 0.8mA
Coil current
500mA/div
Fig.22
LED Open Voltage
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? 2011 ROHM Co., Ltd. All rights reserved.
-10%
0 10 20 30 40 50 60 70 80 90 100
PWM-HI Duty [%]
Fig.20
LED current matching - PWM HI Duty
VF Dispersion of LED line interval is 2.6V.
PWM = 200Hz
4/15
-10%
0 5 10 15 20 25 30
Duty [%]
Fig.21
LED current matching - PWM HI Duty (Expansion)
VF Dispersion of LED line interval is 2.6V.
PWM = 200Hz
2011.06 - Rev.B
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