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Rohm Semiconductor Electronic Components Datasheet

BD9479FV Datasheet

White LED Driver

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Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD
Panels (DCDC Converter type)
BD9479FV
General Description
BD9479FV 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. BD9479FV 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 BD9479FV 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
Oscillator frequency:
150kHz (RT=100kΩ)
Operating Current:
8.7mA (typ.)
Operating temperature range:
-40to +85
Applications
TV, Computer Display, Notebook, LCD Backlighting
Features
8ch LED constant current driver (external PNP Tr
Type)
Maximum LED setting current 500mA (VREF pin
setting)
Build-in DC/DC converter
Analog Dimming (Linear) function
Individual channel PWM Dimming function
LED protection function (Open Short protection)
[PWM-independent Type]
Output short protection (OVP)
Built-in Timer latch function (CP)
Built-in under voltage Lockout function (UVLO)over
voltage protection (OVP)
Built-in FAIL indication function
Built-in OVP voltage Feedback function
Built-in PWM-independent soft start circuit
SSOP-B40 Package
Package
SSOP-B40:
Pin Pitch:
W(Typ.) D(Typ.) H(Max.)
13.6mm x 7.80mm x 1.80mm
0.65mm
Typical Application Circuit
Figure 1. SSOP-B40
Figure 2. Typical Application Circuit
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
1/26
TSZ02201-0F1F0C100020-1-2
25.Sep.2015 Rev.002


Rohm Semiconductor Electronic Components Datasheet

BD9479FV Datasheet

White LED Driver

No Preview Available !

BD9479FV
Datasheet
Absolute maximum ratings (Ta=25)
Parameter
Symbol
Ratings
Power supply voltage
VCC
36
BS1-8 terminal voltage
BS1-8
40
OVP, STB, PWM1-8,VREF,UVLO terminal voltage
REG50, N, CS, CP, LSP, CL1-8, FB, SS, RT
terminal voltage
Power dissipation (SSOP-B40)*1
OVP, STB, PWM1-8,VREF,UVLO
REG50, N, CS, CP, LSP, CL1-8,
FB, SS, RT
Pd
20
7
1.125(Note1)
Operating temperature range
Ta(opr)
-40 to +85
Storage temperature range
Tstg -55 to +150
Junction temperature
Tjmax
150
(Note1) SSOP-B40 package at Ta25C or higher, de-rating power rating by 9.0mW/C(70.0mm x 70.0mm x1.6mm with 1-layer board)
Unit
V
V
V
V
W
Operating Ratings (Ta = 25)
Parameter
Symbol
VCC supply voltage
VCC
Analog Dimming setting (VREF Pin) range
VREF
LSP setting voltage range
VLSP
DC/DC oscillation frequency
FCT
PWM pin input frequency range
F_PWM
Above operating condition are the constants of IC itself. Please pay attention at the actual set.
Limits
9.0 to 35.0
0.6 to 3.0
0.3 to 3.0
100 to 800
0.05 to 20
Unit
V
V
V
kHz
kHz
Recommended external component range
Parameter
Symbol
VCC pin connecting capacity
CVCC
DC/DC frequency setting resistant
RRT
REG50 pin connecting capacity
CREG50
Soft start setting capacity
CSS
Timer Latch setting capacity
CCP
Above operating condition are the constants of IC itself. Please pay attention at the actual set.
Limits
1 to 100
18.75 to 150
1.0 to 10
0.001 to 1.0
0.001 to 1.0
Unit
uF
k
uF
uF
uF
Pin Configuration
Marking diagram and physical dimension
BD9479FV
Marking
1PIN MARK LOT No
SSOP-B40
Figure 3. Pin Configuration
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
2/26
Figure 4. Physical Dimension
TSZ02201-0F1F0C100020-1-2
25.Sep.2015 Rev.002


Part Number BD9479FV
Description White LED Driver
Maker ROHM
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BD9479FV Datasheet PDF






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