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PDF BD6077GUT Data sheet ( Hoja de datos )
| Número de pieza | BD6077GUT | |
| Descripción | White Backlight LED Drivers | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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BD6077GUT
LED Drivers for LCD Backlights
White Backlight LED Drivers
for Small to Medium LCD Panels
(Switching Regulator Type)
BD6077GUT
No.11040EAT41
●Description
The BD6077GUT is a white LED driver IC with synchronous rectification that can drive up to 3LEDs.
With synchronous rectification (no external schottky diode required) and small package, they can save mount space.
And the brightness of LED can be adjusted by using PWM pulse on EN pin.
●Features
1) Synchronous rectification Boost DC/DC converter
2) No external schottky diode required
3) Driving 3 series white LEDs
4) Over voltage protection
5) Protect open and short output
6) Thermal shut down
7) Brightness adjustment by external PWM pulse
8) Small and Thin CSP package in 8pins
●Applications
White LED Backlight
Torchlight and easy flash for camera of mobile phone
●Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
Maximum applied voltage 1
VMAX1
Maximum applied voltage 2
VMAX2
Power dissipation
Pd
Ratings
7 *1
20 *1
750 *2
Unit Condition
V Vin, EN, VFB, TEST
V SW, Vout
mW
Operating temperature range
Topr
-30~+85
℃
Storage temperature range
Tstg
-55~+150
℃
*1 These value are based on GND and GNDA pins.
*2 50mm×58mm×1.75mm At glass epoxy board mounting. When it’s used by more than Ta=25 ℃, it’s reduced by 6.0mW/℃.
●Operating conditions (Ta=25°C)
Parameter
Power supply voltage
Symbol
Vin
Ratings
Min. Typ. Max.
2.7 3.6 5.5
Unit
V
Condition
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/16
2011.12 - Rev.A
1 page  
BD6077GUT
●Electrical characteristic curves (Reference data) – Continued
delta=1.68V
V OUT
EN
VOUT
VFB
Iin
Peak=160m
Fig.13 LED Open output voltage
Fig.14 LED brightness adjustment
Technical Note
VOUT
EN
VFB
Peak=208mA
Vin=3.6V, Ta=25 oC
3LED, 34mA Load
Iin
Fig.15 Soft Start
500
400 VIN=4.2V
300 VIN=3.9V
VIN=5.2V
200 VIN=3.1V
VIN=3.6V
100
0
0 20 40 60 80 100
Duty[%]
Fig.16 LED brightness adjustment
for PWM control
50
40
30 VIN=4.2V
20 VIN=3.9V
VIN=3.1V
VIN=5.2V
10
VIN=3.6V
0
0 2 4 6 8 10
Duty[%]
Fig.17 LED brightness adjustment
for PWM control (Expansion)
20%
15%
10%
VIN=5.2V
5%
VIN=3.6V
0%
-5%
VIN=3.1V
-10%
VIN=4.2V
-15%
-20%
0
20 40 60 80 100
Duty[%]
Fig.18 LED brightness variation
for PWM control
(comparison of VFB at VIN=3.9V)
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/16
2011.12 - Rev.A
5 Page 
BD6077GUT
Technical Note
●Load Regulation Test
The load current from VOUT is set as 15mA(LED)+10mA(key) and +10mA is set to ON/OFF and tested. At that time, VOUT
and Ripple of VFB are measured. (VOUT : less than 700mV,VFB : less than 150mV) The difference of VFB voltage in case
load is ON and the voltage at the time of being OFF is measured. (≤ ±1%)
VIN
1µF
PWM
22µH
VIN SW
VOUT
EN
TEST
GNDA GND
VFB
I load
1µF
ILED
RFB
3234ΩΩ
VOUT
1kΩ VFB
ON/OFF I load
less than 700mVp-p
Aver.A
Less than 150mVp-p
Aver.B
Fig.31 Load Regulation Test circuit
1 - A/B = less than 1%
Fig.32 Transient Load Regulation test
The shaded portion in the figure below is the setting range of LED current to become the standard. Depending on coils and
white LEDs to be used, however, some ICs may not be used at desired currents. Consequently, for the proper setting of
LED current, thoroughly check it for the suitability under use conditions including applicable power supply voltage and
temperature.
80 Po=310mW Line
70
60
50
40
30
20
10
0
7 8 9 10 11 12 13 14
VOUT [V]
Fig.33 Setting range of LED current
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
11/16
2011.12 - Rev.A
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet BD6077GUT.PDF ] | |
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