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PDF BD6069GUT Data sheet ( Hoja de datos )
| Número de pieza | BD6069GUT | |
| Descripción | White Backlight LED Drivers | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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BD6067GU
LED Drivers for LCD Backlights
White Backlight LED Drivers
for Small to Medium LCD Panels
(Switching Regulator Type)
BD6067GU, BD6069GUT, BD6071HFN, BD6072HFN
No.11040ECT19
●Description
Switching Regulator type LED Driver Series for small LCD backlight are boost DC/DC converters possible to drive the white
LEDs at constant. It is possible that turning on white LED steadily by a series connection which has no current variation, and
by a fast transient response with current mode. And, BD6069GUT/BD6071HFN/BD6072HFN are white LED driver ICs with
synchronous rectification. With synchronous rectification (no external schottky diode required) and small package, they can
save mount space. BD6071HFN suited over voltage and over current limit from BD6069GUT/BD6072HFN.
●Features
1) Boost DC/DC converter
2) Adjustment of brightness by external PWM pulse
3) Possible to driving 3 LEDs (BD6071HFN )
4) Possible to driving 4 LEDs (BD6069GUT, BD6072HFN)
5) Possible to driving 8 LEDs (BD6067GU)
6) Soft start function (BD6067GU, BD6069GUT, BD6071HFN, BD6072HFN)
7) Synchronous rectification Boost DC/DC converter (BD6069GUT, BD6071HFN, BD6072HFN)
8) No external schottky diode required (BD6069GUT, BD6071HFN, BD6072HFN)
9) Output Open • Short protect (BD6069GUT, BD6071HFN, BD6072HFN)
●Applications
These drivers are applicable for various fields such as mobile phones, portable game machines, Inter-phone camera,
audio player, portable DVD player, back light for printer display etc… and support light of the camera for the mobile phone,
simple flash. And, these can use power supply for OEL.
●Line up matrix
Parameter
BD6067GU
BD6069GUT
BD6071HFN
BD6072HFN
Input
voltage range
2.7 ~ 5.5V
2.7 ~ 5.5V
2.7 ~ 5.5V
2.7 ~ 5.5V
Switching
frequency
0.8 ~ 1.2MHz
0.8 ~ 1.2MHz
0.8 ~ 1.2MHz
0.8 ~ 1.2MHz
White LED
number
5~8
4
3
4
Operating
temperature range
-30 ~ +85℃
-30 ~ +85℃
-30 ~ +85℃
-30 ~ +85℃
Package
VCSP85H1
VCSP60N1
HSON8
HSON8
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/29
2011.01 - Rev.C
1 page  
BD6067GU, BD6069GUT, BD6071HFN, BD6072HFN
Technical Note
►BD6067GU
●Release Circuit Protection
1) Operation
BD6067GU is a constant frequency PWM current mode DC/DC converter. It is shown in the block diagram of Fig.11. In a
PWM comparator forming one of the PWM current mode features, one is an error element from the error amplifier and
another is an element produced by superimposing the inductor current on a slope waveform that prevents sub-harmonic
oscillation. This output controls Q1 via the RS latch. Energy is stored in an external inductor whileQ1 is ON and then it is
moved to the COUT capacitor via D1 while Q1 is OFF. In this way, voltage Vout higher than input voltage Vin can be
obtained. Because the above operation is performed in a way that the VFB pin voltage equals the Vfb voltage, the boost
voltage is dominantly determined by the expression “Vf × number of LEDs.”
Vout voltage = (Vf × number of LEDs) + Vfb
2) LED current control
The LED current is determined depending on the VFB pin voltage “Vfb” and the resistance connected to VFB.
ILED is given below.
ILED =200mV/ R1
ILED [mA]
5
10
12
15
20
BD6067GU
39
20
16
13
10
R1 [Ω]
3) Dimming control
▪ Control by PWM signal
The startup condition of BD6067GU is controlled via the SHDNB/EN pin. It is powered OFF at 0.4V or less and powered
ON at 1.4V or more.
As shown in Fig.13, brightness is controlled in the BD6067GU via the PWM signal input the SHDNB/EN pin. In this way,
the LED current is controlled in a range from 0 to the maximum current. The average LED current increases in
proportion to the Duty cycle of the PWM signal. In the PWM off cycle, no current dissipation takes place in IC and LEDs,
resulting in high efficiency. Duties below 5% and above 95% must no be used for brightness control because they
significantly affects the leading and trailing edges. BD6067GU standard PWM frequency ranges from 100Hz to 300Hz.
L1
22μH
Vin
Vin SW
D1
Vout
BD6067GU
1μF
VFB
GNDA GND
VDAC
EN
ILED
PWM
100Hz~300Hz
R1
10Ω
Fig.13 Example of Brightness Control by PWM signal at the EN Pin
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/29
2011.01 - Rev.C
5 Page 
BD6067GU, BD6069GUT, BD6071HFN, BD6072HFN
Technical Note
►BD6071HFN
●Electrical characteristic curves (Reference data)
90 90
85 85
80 CoilCraft : DO1608C-223
75 MURATA:LQH32CN220K53
TDK:VLCF4020T-220MR56
70
TDK:VLF3012AT-220MR33
65
80
75
70
65
CoilCraft : DO1608C-223
MURATA:LQH32CN220K53
TDK:VLCF4020T-220MR56
TDK:VLF3012AT-220MR33
90
85
VIN=5.5V
80
VIN=4.5V
75 VIN=3.6V
70 VIN=3.1V
65
60
10 15 20 25 30 35 40
ILED [mA]
Fig.24 Efficiency vs. LED current in each coil
< 2LED > (VOUT=7.5V, VIN=3.6V, Ta=25℃)
60
10 15 20 25 30 35 40
ILED [mA]
60
10 15 20 25 30 35 40
ILED [mA]
Fig.25 Efficiency vs. LED current in each coil Fig.26 Efficiency vs. LED current
< 3LED > (VOUT=10.5V, VIN=3.6V, Ta=25℃)
< 2LED > (VOUT=7.5V, Ta=25℃)
90
85
80
75 VIN=5.5V
VIN=4.5V
70 VIN=3.6V
VIN=3.1V
65
60
10 15 20 25 30 35 40
ILED [mA]
Fig.27 Efficiency vs. LED current
< 3LED > (VOUT=10.5V, VIN=3.6V, Ta=25℃)
0.53
0.52
Ta=85℃
0.51
Ta=25℃
0.5
0.49 Ta=-30℃
0.48
0.47
2.5 3 3.5 4 4.5 5 5.5
VIN [V]
Fig.30 Feedback voltage vs.
Power source voltage
340
320
300 VIN=3.1V
280
260
240
VIN=3.6V
220 VIN=5.5V
200
-30 -10 10 30 50 70 90
Temparature [℃]
Fig.28 Inductor current limits vs.
Temperature
EN
5V/div
IIN
100mA/dev
VOUT
10V/div
VFB
0.5V/div
( 100µs/div )
Fig.31 Soft Start
( VIN = 3.6V, Ta = 25℃, 3LED, 20mA Load )
2000
1500
1000
Ta=-30℃
Ta=25℃
500 Ta=85℃
0
2.5 3 3.5 4 4.5
VIN [V]
Fig.29 Output power vs. power
source voltage
VOUT
1V/div
⊿V=1.57V
IIN
200mA/div
10ms
Ave IIN =1.5mA ( 4ms/div )
Fig.32 LED Open output voltage
EN
2V/div
IIN
200mA/div
ILED
20mA/div
VOUT
5V/div
( 4ms/div )
Fig.33 LED luminance adjustment
( VIN = 3.6V, Ta = 25℃, 3LED, 20mA Load )
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
11/29
2011.01 - Rev.C
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BD6069GUT.PDF ] | |
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