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BD81A04EFV-M PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD81A04EFV-M
기능 4-Channel Back-Boost White LED Driver
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BD81A04EFV-M 데이터시트, 핀배열, 회로
Datasheet
4-Channel Back-Boost
White LED Driver
with Integrated FET for up to 32 LEDs
BD81A04EFV-M
General Description
BD81A04EFV-M is a white LED driver with the capability
of withstanding high input voltage
(40V MAX).This driver has 4ch constant-current drivers
integrated in 1-chip, which each channel can draw up to
120mA max, so that high brightness LED driving can be
realized. Furthermore, a current-mode buck-boost DC/DC
controller is also integrated to achieve stable operation
against unstable car-battery voltage input and also to
remove the constraint of the number of LEDs in series
connection. The brightness can be controlled by PWM
techniques. The set board can be made a conserve area
because MOSFET is built into
Key Specifications
Power supply voltage
LED output current accuracy
Oscillation frequency
Operating temperature range
PWM minimum pulse width
LED maximum output current
Packages
HTSSOP-B28
4.5 to 35 [V]
±3.0 % @50mA
200 to 2200 KHz
-40 to 85
1usec
120Ach
6.5 ×6.4 ×1.0
Features
Integrated buck-boost current-mode DC/DC controller
Four integrated LED current driver channels (120 mA
max. each channel)
PWM Light Modulation
Built-in protection functions (UVLO, OVP, TSD, OCP,
SCP)
Abnormal status detection function (OPEN/ SHORT)
Applications
For display audio, Small and medium-sized type
LCD panel
Typical Application Circuits
CIN
Vin
(GND)
(GND)
(GND)
VREG
VCC
EN
VDISC
RRT
(GND)
SYNC
RT
RPC
CPC
(GND)
CSS
(GND)
COMP
SS
PWM
BD81A04EFV/MUV
RISET
(GND)
(GND)
ISET
GND
SHDETEN LEDEN1 LEDEN2
OVP
CS
COUT
(DGND)
(DGND)
BOOT
OUTH
SW
OUTL
(DGND)
DGND
(DGND)
LED1
LED2
LED3
LED4
PGND
FAIL1
(PGND)
FAIL2
Product structureSilicon monolithic integrated circuit
This product is not designed protection against radioactive rays.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
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TSZ02201-0G1G0C600010-1-2
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BD81A04EFV-M pdf, 반도체, 판매, 대치품
BD81A04EFV-M
Datasheet
Electrical Characteristics (unless otherwise specified, VCC=12V Ta=25)
Parameter
Limits
Symbol
Min
Typ Max.
Circuit current
ICC -
- 10
Standby current
[VREG Block (VREG)]
IST -
- 10
Unit Conditions
mA
EN=Hi, SYNC=Hi, RT=OPEN
PWM=Low,ISET=OPEN,CIN=10 F
A EN=Low
Reference voltage
[OUTH Block
VREG
4.5
5
5.5 V IREG=-5mA, CREG=2.2 F
OUTHhigh-side ON resistance
RONHH
1.5
3.5
7.0
ION=-10mA
OUTH low-side ON resistance
RONHL
1.0
2.5
5.0
ION=10mA
OCP voltage
[OUTL Block]
OUTL ON resistance
VOLIMIT VCC-0.66 VCC-0.6 VCC-0.54 V
RONL
0.44
0.8
1.15
ION=10mA
[SW Block]
SW ON resistance
RON_SW
5.0
10.0 15.0
ION_SW=10mA
[Error Amplifie Block]
LED control voltage
VLED
0.9
1.0
1.1 V
COMP sink current
ICOMP
SINK
20
80 160 A VLED=2V, Vcomp=1V
COMP source current
[Oscillator Block]
ICOMP
SOURCE
-160
-80
-20 A VLED=0V, Vcomp=1V
Oscillating frequency1
FOSC1
285
300
315 KHz RT=27K
Oscillating frequency2
FOSC2
1800
2000
2200 KHz RT=3.9K
[OVP Block]
OVP voltage
VOVP
1.9
2.0
2.1 V VOVP=Sweep up
OVP hysteresis width
VOHYS
0.45
0.55
0.65 V VOVP=Sweep down
SCP Latch OFF Delay Time
TSCP
70
100 130 ms RT=27K
[UVLO Block ]
UVLO voltage
VUVLO
3.2
3.5
3.8 V VCC : Sweep down
UVLO hysteresis width
VUHYS
250
500
750 mV VCC : Sweep up,VREG>3.5V
[LED Output Block]
LEDcurrentrelativedispersionwidth ILED1
-3
-
ILED=50mA,
+3 % ILED1=(ILED/ILED_AVG-1)×100
LEDcurrentabsolutedispersionwidth ILED2
-3
-
+3
%
ILED=50mA,
ILED2=(ILED/50mA-1)×100
ISET voltage
VISET
0.9
1.0
1.1 V RISET=100K
PWM minimum pulse width
Tmin
1
-
- s FPWM=150Hz, ILED=100mA
PWM maximum duty
Dmax
-
- 100 % FPWM=150Hz, ILED=50mA
PWM frequency
FPWM
-
- 20 KHz Duty=2%, ILED=50mA
Open detection voltage
VOPEN
0.2
0.3
0.4 V VLED= Sweep down
LED Short detection voltage
VSHORT
4.2
4.5
4.8 V VLED= Sweep up
LED Short Latch OFF Delay Time TSHORT
70
100 130 ms RT=27K
PWM Latch OFF Delay Time
TPWM
70
100 130 ms RT=27K
[Logic Inputs (EN, SYNC, SHDETEN, PWM, LEDEN1, LEDEN2)]
Input HIGH voltage
VINH
2.1
-
Input LOW voltage
VINL
GND
-
Input current
IIN 25 50
5.5 V
0.8 V
100
A
VIN=5V(EN,SYNC,PWM,
SHDETEN, LEDEN1, LEDEN2)
[FAIL Output (open drain) ]
FAIL LOW voltage
VOL - 0.1 0.2 V IOL=0.1A
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/24
TSZ02201-0G1G0C600010-1-2
16.APR.2012 Rev.002

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BD81A04EFV-M 전자부품, 판매, 대치품
BD81A04EFV-M
Datasheet
Description of Blocks
1.voltage reference (VREG)
5V (Typ.) is generated from the VCC input voltage when the enable pin is set HI. This voltage is used to power internal
circuitry, as well as the voltage source for device pins that need to be fixed to a logical HI.
UVLO protection is integrated into the VREG pin. The voltage regulation circuitry operates uninterrupted for VREG
voltages VCC>4.0V(Typ.) and VREG>3.5VTyp., but if output voltage drops to VCC<3.5V(Typ.) or VREG<2.0VTyp.
UVLO engages and turns the IC off.
Connect a capacitor (Creg = 2.2uF Typ.) to the VREG terminal for phase compensation. Operation may become unstable if
Creg is not connected.
2. Constant-current LED drivers
Table1 LED voltage
LED EN
LED
1
2
1
2
3
4
L L ON ON ON ON
H L ON ON ON OFF
L
H
ON
ON
OFF
OFF
H
H
ON
OFF
OFF
OFF
If less than four constant-current drivers are used, unused channels should be switched off via the LEDEN pin configuration.
The truth table for these pins is shown above. If a driver output is enabled but not used (i.e. left open), the IC’s open
circuit-detection circuitry will operate. Please keep the unused pins open. The LEDEN terminals are pulled down
internally in the IC, so if left open, the IC will recognize them as logic LOW. However, they should be connected directly to
VREG or fixed to a logic HI when in use.
(1)Output current setting
ILED vs RISET
100.00
10.00
10
100
RISET[kΩ]
1000
Fig.9 RISET vs ILED
LED current is computed via the following equation:
ILED= 1.0V / RISET x GAIN [A] GAIN=5000(TYP.)
GAIN is a constant decided in the circuit .
(2)PWM intensity control
PWM(2V/div)
500nsec/div
PWM(2V/div)
1msec/div
ILED(50mA/div)
ILED(50mA/div)
Fig.10 PWM=150Hz, Duty=0.02% ILED wave form
Fig.11 PWM=150Hz, Duty=50.0% ILED wave form
In PWM intensity control mode, the ON/OFF state of each current driver is controlled directly by the input signal on the
PWM pin; thus, the duty ratio of the input signal on the PWM pin equals the duty ratio of the LED current. When not
controlling intensity via PWM, fix the PWM terminal to a high voltage (100%). Output light intensity is greatest at 100%
input.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
7/24
TSZ02201-0G1G0C600010-1-2
16.APR.2012 Rev.002

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부품번호상세설명 및 기능제조사
BD81A04EFV-M

4-Channel Back-Boost White LED Driver

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