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

●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

W (Typ.) x D(Typ.) x H(Max.)

HSOP-M28

18.50mm x 9.90mm x 2.41mm

HTSSOP-B28

9.70mm x 6.40mm x 1.00mm

●Typical Application Circuit

Figure 3. Typical Application Circuit

Figure 1. HSOP-M28

Figure 2. HTSSOP-B28

STB

VCC

REG58

GND

FB

SS

RT

LED6

PWM4

PWM6

DCDC_GND

N

ISET

CS

PWM1

PWM2

LSP

PWM3

PWM5

FAIL

OVP

LED5

LED4

LED_GND

LED3

LED2

LED1

UVLO

VIN

STB

PWM

FAIL

○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays

1/35

TSZ02201-0F10C1002000-1-2

© 2013 ROHM Co., Ltd. All rights reserved.

19.Oct.2013 Rev.003

www.rohm.com

TSZ22111・14・001

Datasheet