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Número de pieza | BD6074GUT | |
Descripción | White Backlight LED Drivers | |
Fabricantes | ROHM Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de BD6074GUT (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
No Preview Available ! BD6074GUT
LED Drivers for LCD Backlights
White Backlight LED Drivers
for Small to Medium LCD Panels
(Switching Regulator Type)
BD6074GUT
No.11040EAT39
●Description
The BD6074GUT is a white LED driver IC with synchronous rectification that can drive up to 4LEDs.
With synchronous rectification (no external shottky 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 4 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
Torch light and easy flash for camera of mobile phone
●Absolute maximum ratings (Ta=25℃)
Parameter
Symbol
Maximum applied voltage 1
VMAX1
Maximum applied voltage 2
Power dissipation
VMAX2
Pd
Ratings
7 *1
20 *1
800 *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 6.4mW/℃.
●Operating range(Ta=-30℃~+85℃)
Parameter
Symbol
Power supply voltage
Vin
Ratings
Min. Typ. Max.
2.7 3.6 5.5
Unit
V
Condition
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/15
2011.12 - Rev.A
1 page BD6074GUT
●Electrical characteristic curves (Reference data) – Continued
1.VOUT
Δ=1.66V
5.3ms
2.IIN
Vin=3.6V
Ta=25℃
1.VOUT
2.IIN
Idd=1.5mA
(4ms/div)
1V/div AC
200mA/div DC
Fig.13 LED Open output voltage
1.EN
2.VOUT
3.VFB
Peak=204mA
4.IIN
(3ms/div)
1.EN 2V/div DC 2.VOUT 5V/div DC
3.VFB 500mV/div DC 4.IIN 200mA/div DC
Fig.14 LED brightness adjustment
Technical Note
1.EN
2.VOUT
3. VFB
Peak=368mA
4. IIN
Vin=3.6VV, iTna==32.65Vo,CTa=25℃
4LED, 344mLEADL,o3a4dmA Load
Fig.15 Soft Start
500
450
400
VIN=3.6V
350
300 VIN=3.1V
250 VIN=5.5V
200
150 VIN=4.2V
100 VIN=2.9V
50
0
0 10 20 30 40 50 60 70 80 90 100
Duty[%]
Fig.16 LED brightness adjustment
for PWM control
50
40 VIN=4.2V
30
VIN=3.9V
20 VIN=3.1V
VIN=5.2V
10
0
0 2 4 6 8 10
Duty[%]
Fig.17 LED brightness adjustment
for PWM control (Expansion)
50%
40%
30%
20%
10%
0%
-10%
-20%
-30%
-40%
-50%
0
VIN=5.2V
VIN=4.2V
VIN=3.6V
VIN=3.1V
24 6
Duty[%]
8
10
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.
5/15
2011.12 - Rev.A
5 Page BD6074GUT
Technical Note
●Selection of external parts
Recommended external parts are listed as below.
When to use other parts than these, select the following equivalent components.
・Coil
Value Tolerance Manufacturer
22µH
±10%
MURATA
Product number
LQH32CN220K53
Vertical
size
2.5
Size
Horizontal
size
3.2
Height
1.55
22µH
±20%
TDK
VLF3012AT220MR33
2.6
2.8
1.2
22µH
±20%
Coil Craft
DO1608
4.45 6.6 2.92
22µH
±20%
TDK
VLF3010AT220MR33
2.6
2.8
1.0
Please refer to the reference data of p.4 for the change in the efficiency when the coil is changed.
DCR
(Ω)
0.71
0.66
0.37
1.30
・Capacitor
Value
Manufacturer
【 CIN 】
1µF
【 COUT 】
1µF
MURATA
MURATA
Product number
GRM188B11A105K
GRM188B11E105K
Vertical
size
Size
Horizontal
size
Height
1.6 0.8 0.8
Temperature
range
-25℃~+85℃
1.6 0.8 0.8 -25℃~+85℃
・Resistor
Value Tolerance Manufacturer
【 RFB 】
24Ω
±1%
ROHM
Product number
MCR006YZPF24R0
Vertical
size
Size
Horizontal
size
Height
0.6 0.3 0.23
The coil is the component that is most influential to efficiency. Select the coil which direct current resistor (DCR) and
current - inductance characteristic are excellent. The BD6074GUT are designed for the inductance value of 22µH.
Please do not use other inductance value. Select a capacitor of ceramic type with excellent frequency and temperature
characteristics. Further, select Capacitor to be used for CIN/COUT with small direct current resistance, and pay much
attention to the PCB layout shown in the next page.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
11/15
2011.12 - Rev.A
11 Page |
Páginas | Total 16 Páginas | |
PDF Descargar | [ Datasheet BD6074GUT.PDF ] |
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