BD9394FP Datasheet, PDF (1/31 Pages) Rohm – White LED Driver for large LCD Panels (DCDC Converter type)

Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD
Panels (DCDC Converter type)
BD9394FP, BD9394EFV
●General Description
BD9394FP, BD9394EFV is a high efficiency driver for
white LEDs and designed for large LCDs. This IC is
built-in a boost DCDC converters that employ an array of
LEDs as the light source. BD9394FP, BD9394EFV has
some protect function against fault conditions, such as
the over-voltage protection (OVP), the over current limit
protection of DCDC (OCP), the short circuit protection
(SCP), the open detection of LED string. Therefore
BD9394FP, BD9394EFV is available for the fail-safe
design over a wide range output voltage.
●Key Specification
„ Operating power supply voltage range: 9.0V to 35.0V
„ LED minimum current
30mA
„ LED maximum current:
150mA
„ Oscillator frequency:
150kHz (RT=100kΩ)
„ Operating Current:
4.5mA (Typ.)
Operating temperature range:
-40℃ to +85℃
●Applications
TV, Computer Display, Notebook, LCD Backlighting
●Features
„ 4ch LED constant current driver and DC/DC converter
„ Maximum LED Current: 150mA
„ LED Feedback Voltage: 0.37V (@NADIM=2.62V),
so lower heat. Adjustable Feed Back Voltage
by following LED Current setting.
„ ±2% LED current accuracy (NADIM=2.62V,
when each LED is set to 100mA)
„ Analog current (Linear) dimming at NADIM pin
„ LED pin rating 60V
„ Individual detection and individual LED OFF for both
open and short circuits
„ Built-in ISET pin short-circuit protection circuit
„ Set Soft-Start time by external capacitor.
„ FET’s Gate (N pin) is driven by 5.8V swing
„ Built-in Vout discharge circuit for shutdown
„ Built-in Vout overvoltage protection (OVP) /
reduced voltage protection (SCP) circuit
„ Adjustable LED Short Protection Voltage
by LSP terminal
„ HSOP20, HTSSOP-B24 package with high heat
radiation efficiency
●Package
HSOP20
HTSSOP-B24
W(Typ.) x D(Typ.) x H(Max.)
14.90mm x 7.80mm x 2.10mm
7.80mm x 7.60mm x 1.00mm
● Typical Application Circuit (4 light with PWM)
VIN
VIN
Inductor
Diode
Fig.1(a) HSOP20
CIN
FET
PGND
AGND
REG58
COUT
REG58
CREG
RN2
RCS
DN RN1
RRT
ROVP1
ROVP2
COVP
RFB CFB1
RLSP1
RLSP2
CFB2
CLSP
CSS
RISET
CAUTO
NADIM
FIN1, 2
REG58
N
DCDC_GND
CS
RT
OVP
FB
LSP
SS
ISET
AUTO
NADIM
STB
VCC
LED4
LED3
LED_GND
LED2
LED1
PWM
AGND
ON/OFF
RVCC
CVCC
CLED4
CLED3
CLED2
CLED1
PWM
Fig.1(b) HTSSOP-B24
Fig.2 Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays
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09.Nov.2012 Rev.002