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PDF BD81A04EFV-M Data sheet ( Hoja de datos )
| Número de pieza | BD81A04EFV-M | |
| Descripción | 4-Channel Back-Boost White LED Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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
120ｍA／ch
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 structure：Silicon monolithic integrated circuit
○This product is not designed protection against radioactive rays.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
1/24
TSZ02201-0G1G0C600010-1-2
16.APR.2012 Rev.002
1 page  
BD81A04EFV-M
● Reference data (unless otherwise specified, Ta=25℃)
8
VCC=SWEEP
EN=4V
PWM=0V
6 Ta=25℃
4
2
0
0 10 20 30 40
Supply Voltage ：VCC[V]
Fig.1 Circuit Current
(Switching OFF)
Datasheet
5.5
VCC=12V,35V
5.0
4.5
VCC=4.5V
4.0
3.5
-60
-20 20
60
Tempurature ： Ta[℃]
100
Fig.2 VREG temperature characteristic
400 3000
VCC=12V
VCC=12V
350
EN=4V
RT=27KΩ
2500
EN=4V
RT=3.9KΩ
300 2000
250 1500
200
-60
-20 20
60
Temperature ： Ta[℃]
Fig.3 OSC temperature characteristic
(@300KHz)
1000
100
-60
-20 20 60
Temperature ： Ta[℃]
100
Fig.4 OSC temperature characteristic
(@2000KHz)
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/24
TSZ02201-0G1G0C600010-1-2
16.APR.2012 Rev.002
5 Page 
BD81A04EFV-M
●Timing Chart
Datasheet
Fig.14 Protection Sequence timing Chart
＊1 Turn on the EN after the VCC is on
Turn on the PWM and SYNC after VREG≧4.45V.
＊2 The order of turning on PWM and SYNC is arbitrary.
＊3 Aprox 100ms of delay when Fosc = 300kHz
＊4 It is the timing chart that Fail is pull-up in an external voltage.
① LED2 is open mode.
VLED2<0.3V VOVP and > detects 1.7V, and LED2 is turned off.
→FAIL2 becomes Low.
② LED3 is short mode.
VLED3>4.5V is detected, and LED3 after about 100ms is turned off.
③ VLED4 is GND- shorted.
③-1 The output voltage lifts, and OVP is detected with VOVP>2.0V.
→SS pulling out
→FAIL1 becomes Low.
③-2 Shutdown after about 100ms when LED4<0.3V is detected.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/24
TSZ02201-0G1G0C600010-1-2
16.APR.2012 Rev.002
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet BD81A04EFV-M.PDF ] | |
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