BD6067GU_11 ROHM [Rohm], BD6067GU_11 Datasheet - Page 11

• Manufacturer Part Number: BD6067GU_11
• Description: White Backlight LED Drivers for Small to Medium LCD Panels (Switching Regulator Type)
• Manufacturer: ROHM [Rohm]

© 2011 ROHM Co., Ltd. All rights reserved.
BD6067GU, BD6069GUT, BD6071HFN, BD6072HFN
►BD6071HFN
●Electrical characteristic curves (Reference data)
www.rohm.com
Fig.24 Efficiency vs. LED current in each coil
< 3LED > (VOUT=10.5V, VIN=3.6V, Ta=25℃)
0.53
0.52
0.51
0.49
0.48
0.47
( VIN = 3.6V, Ta = 25℃, 3LED, 20mA Load )
< 2LED > (VOUT=7.5V, VIN=3.6V, Ta=25℃)
Fig.33 LED luminance adjustment
0.5
90
85
80
75
70
65
60
90
85
80
75
70
65
60
Fig.27 Efficiency vs. LED current
10
10
2.5
Fig.30 Feedback voltage vs.
IIN
200mA/div
ILED
20mA/div
VOUT
5V/div
EN
2V/div
TDK:VLF3012AT-220MR33
Power source voltage
15
15
3
TDK:VLCF4020T-220MR56
MURATA:LQH32CN220K53
CoilCraft : DO1608C-223
20
20
3.5
VIN=3.1V
ILED [mA]
ILED [mA]
VIN [V]
25
VIN=3.6V
25
4
Ta=25 ℃
VIN=4.5V
Ta=-30 ℃
Ta=85 ℃
30
30
4.5
VIN=5.5V
( 4ms/div )
35
35
5
40
40
5.5
Fig.25 Efficiency vs. LED current in each coil
340
320
300
280
260
240
220
200
( VIN = 3.6V, Ta = 25℃, 3LED, 20mA Load )
90
85
80
75
70
65
60
-30
10
Fig.28 Inductor current limits vs.
< 3LED > (VOUT=10.5V, VIN=3.6V, Ta=25℃)
IIN
100mA/dev
VOUT
10V/div
VFB
0.5V/div
EN
5V/div
-10
15
TDK:VLF3012AT-220MR33
CoilCraft : DO1608C-223
TDK:VLCF4020T-220MR56
Fig.31 Soft Start
MURATA:LQH32CN220K53
VIN=3.6V
VIN=3.1V
10
20
Temparature [ ℃ ]
Temperature
11/29
ILED [mA]
25
30
VIN=5.5V
( 100µs/div )
30
50
70
35
90
40
2000
1500
1000
500
90
85
80
75
70
65
60
Fig.32 LED Open output voltage
0
Fig.29 Output power vs. power
Fig.26 Efficiency vs. LED current
2.5
10
IIN
200mA/div
VOUT
1V/div
< 2LED > (VOUT=7.5V, Ta=25℃)
15
3
source voltage
Ave IIN =1.5mA
20
VIN=3.1V
ILED [mA]
Ta=25 ℃
VIN [V]
VIN=3.6V
10ms
2011.01 - Rev.C
Technical Note
3.5
25
VIN=4.5V
⊿ V=1.57V
30
Ta=85 ℃
VIN=5.5V
( 4ms/div )
Ta=-30 ℃
4
35
4.5
40