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Rohm Semiconductor Electronic Components Datasheet

BD9428 Datasheet

White LED Driver

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Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD
Panels (DCDC Converter type)
BD9428
General Description
BD9428 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. BD9428 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 BD9428 is available for the
fail-safe design over a wide range output voltage.
Key Specifications
Operating power supply voltage range: 9.0V to 35.0V
LED minimum current
30mA
LED maximum current:
250mA
Oscillator frequency:
150kHz (RT=100k)
Operating Current:
4.5mA (Typ.)
Operating temperature range:
-40°C to +85°C
Applications
TV, Computer Display, Notebook, LCD Backlighting
Features
4ch LED constant current driver and DC/DC converter
Maximum LED Current: 250mA
LED Feedback Voltage: 0.40V (@ILED=100mA),
so lower heat. Adjustable Feed Back Voltage
by following LED Current setting.
2% LED current accuracy
(when each LED is set to 100mA)
LED pin rating 80V
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 (SSFB pin).
FET’s Gate (N pin) is driven by 10V swing
Built-in Vout overvoltage protection (OVP) /
Short circuit protection (SCP)
DIP16 package
Package
DIP16
W(Typ.) x D(Typ.) x H(Max.)
19.40mm x 6.50mm x 7.95mm
Typical Application Circuit (4 light with PWM)
VIN
VIN
Inductor
Diode
CIN
FET
PGND
AGND
COUT
REG100
CREG
RN2
RCS DN RN1
RRT
ROVP1
ROVP2
COVP
RFB CFB1
REG100
RISET
RFAIL
REG100
N
GND
CS
RT
OVP
SSFB
ISET
FAIL
STB
VCC
LED4
LED3
LED2
LED1
PWM
ON/OFF
RVCC
CVCC
CLED4
CLED3
CLED2
CLED1
PWM
DIP16
Figure 1. Typical Application Circuit
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product is not designed protection against radioactive rays
1/25
TSZ02201-0F1F0C100290-1-2
16.Oct.2013 Rev.001


Rohm Semiconductor Electronic Components Datasheet

BD9428 Datasheet

White LED Driver

No Preview Available !

BD9428
Datasheet
Absolute maximum ratings (Ta=25°C)
Parameter
Power supply voltage
STB, OVP, PWM, FAIL terminal voltage
LED1 to 4 terminal voltage
CS, ISET, SSFB, RT terminal voltage
REG100, N terminal voltage
Power dissipation
Operating temperature range
Storage temperature range
Junction temperature
*1 Ta = 25°C or more, diminished at -10mW/°C
Symbol
VCC
STB, OVP, PWM, FAIL
LED1 to 4
CS, N, ISET, SSFB, RT
REG100, N
Pd
Topr
Tstg
Tjmax
Rating
36
36
80
7
13
1.25 *1
-40~+85
-55~+150
150
Unit
V
V
V
V
V
W
°C
°C
°C
Operating Ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
VCC supply voltage
VCC
9.0 to 35.0
V
Min. output current of LED1 to 4
ILED_MIN
30 mA *1
Max. output current of LED1 to 4
ILED_MAX
250 mA *1,2
DC/DC oscillation frequency
fsw
100 to 800
kHz
Min. on-duty time for PWM light modulation 1
(under soft-start)
PWM_MIN 1
30 us
Min. on-duty time for PWM light modulation 2
(after soft-start)
PWM_MIN 2
5 us
*1 The amount of current per channel.
*2 If LED makes significant variations in its reference voltage, the driver will increase power dissipation, resulting in a rise in package temperature.
To avoid this problem, design the board with thorough consideration given to heat radiation measures.
Pin Configurations
(TOP VIEW)
1 FAIL
2 REG100
VCC 16
STB 15
3N
RT 14
4 GND
SSFB 13
5 CS
ISET 12
6 OVP
PWM 11
7 LED1
8 LED2
LED4 10
LED3 9
Figure 2. Pin Configuration
Marking Diagram and Physical Dimension
(TOP VIEW)
BD9428
LOT No.
Figure 3. Marking Diagram and Physical Dimension
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
2/25
TSZ02201-0F1F0C100290-1-2
16.Oct.2013 Rev.001


Part Number BD9428
Description White LED Driver
Maker ROHM
PDF Download

BD9428 Datasheet PDF





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