BD9483F Datasheet, PDF (1/32 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)
BD9483F,FV
●General Description
BD9483F,FV is a high efficiency driver for white LEDs
and designed for large LCDs. This IC is built-in 2ch
boost DCDC converters that employ an array of LEDs
as the light source. BD9483F,FV has some protect
function against fault conditions, such as the
over-voltage protection (OVP), the over current limit
protection of DCDC (OCP), Max duty protection, LED
OCP protection. Therefore BD9483F,FV is available for
the fail-safe design over a wide range output voltage.
●Key Specification
 Operating power supply voltage range:11.0V to 35.0V
 Oscillator frequency:
150kHz (RT=100kΩ)
 Operating Current:
3mA (typ.)
 Operating temperature range:
-40°C to +85°C
●Applications
TV, Computer Display, Notebook, LCD Backlighting
●Features
■ 2ch boost DCDC converter with current mode
■ LED protection circuit (Max duty protection, LED
OCP protection)
■ Over-voltage protection (OVP) for the output
voltage Vout
■ Adjustable soft start
■ The wide range of analog dimming 0.2V-3.0V
■ 2ch independent PWM dimming input
■ The UVLO detection for the input voltage of the
power stage
■ FAIL logic output
●Package
SOP-24:
Pin Pitch:
W(Typ.) D(Typ.) H(Max.)
15.00mm x 7.80mm x 2.01mm
1.27mm
●Typical Application Circuit
VCC
VIN
VOUT1
VOUT2
REG90
STB
RT
Css _SS
Ccp _CP
FAILB
PWM1
PWM2
ADIM
VCC
VREG
UVLO
VCC
UVLO
TSD
UVLO
OVP
OVP
REG90
UVLO
OSC
SS
SS-FB
clamper
Fail
detect
PWM
COMP
CONTROL
LOGIC
Current
compensation
REG90
GATE1
CS1
LEB
PGND1
REG90
DIMOUT1
MAXFB
LEDOCP
ERROR
amp
1.0V
ISENSE1
FB1
Each channel
GATE2
CS2
1/3
PGND2
DIMOUT2
ISENSE2
FB2
Figure 1. Typical Application Circuit
Figure 2-1. SOP-24
SSOP-B24:
Pin Pitch:
W(Typ.) D(Typ.) H(Max.)
7.80mm x 7.60mm x 1.35mm
0.65mm
Figure 2-2. SSOP-B24
○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays
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