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LED Drivers



ROHM Semiconductor 로고
ROHM Semiconductor
BD9421F 데이터시트, 핀배열, 회로
Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD Panels
(DCDC Converter Type)
BD9421F
General Description
BD9421F is high efficiency driver for white LED. This is
designed for large sized LCD. BD9421F is built-in
DCDC converters that supply appropriate voltage for
light source.
BD9421F is 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 this is used for conditions of large output voltage
and load conditions.
Features
6ch LED constant current driver(External PNP Tr
Type)
Maximum LED setting current 500mA(VREF Pin
setting)
±2% LED current accuracy(VREF=0.9V setting)
Built-in DC/DC converter
Analog Dimming(Linear) function
LED protection function(OPEN/SHORT
protection)[PWM-independent Type]
Individual detection and individual LED OFF for both
OPEN and SHORT circuit
VOUT Over Voltage Protection(OVP) and reduced
voltage protection(SCP) circuit
Built-in under voltage lockout function(UVLO) and
over voltage protection(OVP)
Built-in VOUT discharge circuit while shutdown
Key Specifications
VCC Supply Voltage Range:
9.0V to 35.0V
DCDC Oscillation Frequency: 150kHz(RT=100k)
Operation Circuit Current:
5mA(Typ)
Operating Temperature Range: -40°C to +85°C
Applications
LED driver for TV, Monitor and LCD Back Light
Package
SOP24
W(Typ) x D(Typ) x H(Max)
15.00mm x 7.80mm x 2.01mm
Pin Pitch 1.27mm
Figure 1. SOP24
Typical Application Circuit
Figure 2. Typical Application Circuit
Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
This product has no designed protection against radioactive rays
1/27
TSZ02201-0F1F0C100310-1-2
31.Jan.2014 Rev.002
http://www.Datasheet4U.com


BD9421F 데이터시트, 핀배열, 회로
BD9421F
Datasheet
Absolute Maximum Ratings(Ta = 25°C)
Parameter
Symbol
Rating
Unit
Supply Voltage
VCC
-0.3 to +36
V
STB,OVP Voltage
STB,OVP
-0.3 to +36
V
BS1-6 Voltage
BS1-6
-0.3 to +60
V
CS,CL1-6,FB,RT Voltage
CS,CL1-6,FB,RT
-0.3 to +7
V
REG75,N Voltage
REG75,N
-0.3 to +14
V
PWM,VREF Voltage
Power Dissipation for SOP24
PWM,VREF
Pd
-0.3 to +20
0.68 (Note 1)
V
W
Operating Temperature Range
Topr
-40 to +85
°C
Storage Temperature Range
Tstg
-55 to +150
°C
Maximum Junction Temperature
Tjmax
150 °C
(Note 1) Derating in done 5.5mW/°C for operating above Ta25°C (Mount on 1-layer 70.0mm x 70.0mm x 1.6mm board)
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over
the absolute maximum ratings.
Recommended Operating Conditions(Ta= -40°C to +85°C)
Parameter
Symbol Min
Typ Max Unit
Supply Voltage
VCC
9
24 35 V
DC/DC Oscillation Frequency
FSW
100
-
800 kHz
Analog Dimming Setting Input Range VREF
0.6
0.9
3.0
V
Pin Configuration
(TOP VIEW)
Marking Diagram and Physical Dimension
SOP24
Figure 3. Pin Configuration
BD9421F
1PIN MARK
LOT No.
Figure 4. Physical Dimension
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
2/27
TSZ02201-0F1F0C100310-1-2
31.Jan.2014 Rev.002
http://www.Datasheet4U.com




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BD9421F driver

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