BD9470AEFV Datasheet, PDF (1/39 Pages) Rohm – White LED driver for medium sized and large sized LCD back light

Datasheet
LED driver series for LCD back light
White LED driver for medium sized
and large sized LCD back light
BD9470AEFV・BD9470AFM
●General Description
BD9470AEFV and BD9470AFM are high efficiency
driver for white LED. They are designed for large sized
LCD. BD9470AEFV and BD9470AFM are built-in
DCDC converter that supply appropriate voltage for
light source.
BD9470AEFV and BD9470AFM are also built-in
protection function for abnormal state such as OVP:
over voltage protection, OCP: over current limit
protection of DCDC, SCP: short circuit protection, open
detection of LED string.
Thus they are used for conditions of large output
voltage and load conditions.
●Features
 6ch LED constant current driver
 LED maximum output current 250mA
 Individual PWM dimming modulation allowed for
LEDs
 ±2% LED current accuracy (when each LED is set
to 130mA)
 Built-in LED feedback voltage automatic adjustment
circuit according to LED current
 Built-in start-up circuit independent of PWM light
modulation
 built-in VOUT ・ FB voltage maintenance function
when PWM=Low（0%）
 Built-in LED current stabilization circuit while
scanning operation is performed
 Built-in VOUT discharge circuit while shutdown
 Built-in LED protection (OPEN / SHORT protection)
 Individual detection and individual LED OFF for
both open and short circuit
 Adjustable LED short-circuit protection threshold
 PWM-independent LED protection
 VOUT over voltage protection (OVP) and reduced
voltage protection (SCP) circuit
 Built-in failure indication function
 Built-in ISET pin short-circuit protection circuit
●Typical Application Circuit
VIN
ISET
SS
PWM1
FB
PWM2
RT
PWM3
DCDC_GND
PWM4
N
PWM5
CS
PWM
PWM6
REG58
●Key Specifications
 VCC supply Voltage range:
9.0V～35.0V
 LED minimum output current:
40mA
 LED maximum output current:
250mA
 DCDC oscillation frequency: 150KHz(RT=100Kohm)
 Operation circuit current:
6mA(typ.)
 Operating temperature range:
-40℃～85℃
●Applications
■ LED driver for TV, monitor and LCD back light
●Package
HSOP-M28
HTSSOP-B28
W (Typ.) x D(Typ.) x H(Max.)
18.50mm x 9.90mm x 2.41mm
9.70mm x 6.40mm x 1.00mm
Figure 1. HSOP-M28
Figure 2. HTSSOP-B28
GND
VCC
STB
FAIL
FAIL
STB
OVP
LSP
LED6
UVLO
LED5
LED1
LED4
LED2
LED_GND
LED3
Figure 3. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
1/35
TSZ02201-0F10C1002000-1-2
19.Oct.2013 Rev.003