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

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