BD6074GUT PDF даташит
Спецификация BD6074GUT изготовлена «ROHM Semiconductor» и имеет функцию, называемую «White Backlight LED Drivers». |
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Детали детали
Номер произв | BD6074GUT |
Описание | White Backlight LED Drivers |
Производители | ROHM Semiconductor |
логотип |
16 Pages
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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
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© 2011 ROHM Co., Ltd. All rights reserved.
1/15
2011.12 - Rev.A
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BD6074GUT
Technical Note
●Electrical characteristics
Unless otherwise specified Ta =-30℃ ~+85℃, Vin=3.1~5.5V
Parameter
Limits
Symbol
Min. Typ.
[ EN terminal ]
EN threshold voltage (Low)
VthL
-
-
Max.
0.4
EN threshold voltage (High)
VthH
1.4
-
-
EN terminal input current
Iin - 18.3 30.0
EN terminal output current
[ Switching regulator ]
Quiescent Current
Iout -2.0 -0.1
-
Iq - 0.1 2.0
Current Consumption
Idd - 1.1 1.5
Feedback voltage
Vfb 0.47 0.50 0.53
Inductor current limit
Icoil 310 400 490
SW saturation voltage
Vsat
- 0.10 0.28
SW on resistance P
Ronp - 2.1 3.2
Switching frequency
fSW 0.8 1.0 1.2
Duty cycle limit
Duty
82.7 92.5
-
Output voltage range
Vo - - 18.0
Over voltage limit
Ovl 18.0 18.5 19.0
Start up time
Ts
*1 This parameter is tested with DC measurement.
- 0.5 1.0
Unit Condition
V
V
µA EN=5.5V
µA EN=0
µA EN=0V
mA EN=2.6V,VFB=1.0V,VIN=3.6V
V
mA Vin=3.6V *1
V Isw=200mA, Vout=13V
Ω Ipch=200mA,Vout=13V
MHz
% VFB=0V
V
V VFB=0V
ms
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
2/15
2011.12 - Rev.A
No Preview Available ! |
BD6074GUT
Technical Note
●Test circuit
*Test circuit A (for Inductor current limit, Feedback voltage, Start up time.)
Procedure
~Inducton current limit~
1. Start to increase Iout from 0mA gradually.
2. You will find that Vout will start to go down and the duty will be decreased.
3. Then, you can measure the coil current as “inductor current limit”
~VFB voltage~
1. Supply 0mA to Iout
2. Then, you can measure the VFB voltage as “Feedback voltage”.
~Start up time~
1. Supply the voltage to VIN
2. Then,you can measure the VFB waveform as “Start up time”.
3.1~5.5V
VIN
1µF
Icoil
22µH
A
VIN SW
monitor
Tall Ton
Ton Duty= Tall
VOUT
EN 1µF
Iout
VIN
TEST
GNDA GND
VFB
V
RFB
24Ω
monitor for Start up time
VFB
Fig.1 Test Circuit A
Start up time
90%
*Test circuit B (for Over voltage limit,Duty cycle limit, Switching frequency)
Procedure
~Over voltage limit~
1. Start to increase VOUT from 9V to 20V
2. You will find frequency change from around 1MHz to 0Hz
3. Then,it is “Over Voltage limit”
~Duty cycle limit, Switching frequency ~
1. Supply 9V to VOUT terminal
2. Then,you can measure the duty as “Duty cycle limit” and the frequency and “Switching frequency”.
3.1~5.5V
VIN
1µF
VIN
EN
SW
VOUT
monitor
1µF
Tall Ton
Ton Duty= Tall
9V to 20V
TEST
GNDA GND
VFB
Fig.2 Test Circuit B
*TEST circuit C
(for Quiescent current, current comsumption, EN Terminal input/output current, EN threshold voltage(Low/High))
3.1~5.5V
ICC
A
1uF A
IEN
0.0~5.5V
VIN SW
EN VOUT
TEST
TEST
GNDA GND VFB
1.0V(current comsumption)
Fig.3 Test Circuit C
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© 2011 ROHM Co., Ltd. All rights reserved.
3/15
2011.12 - Rev.A
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Номер в каталоге | Описание | Производители |
BD6074GUT | White Backlight LED Drivers | ROHM Semiconductor |
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