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BD9483F fiches techniques PDF

ROHM Semiconductor - White LED Driver

Numéro de référence BD9483F
Description White LED Driver
Fabricant ROHM Semiconductor 
Logo ROHM Semiconductor 





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BD9483F fiche technique
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=100k)
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
UVLO
TSD
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 structureSilicon monolithic integrated circuit
.www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product is not designed protection against radioactive rays
1/29
TSZ02201-0F1F0C100100-1-2
28.Nov.2013 Rev.003
Free Datasheet http://www.datasheet4u.net/

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