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BD9428 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD9428
기능 White LED Driver
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BD9428 데이터시트, 핀배열, 회로
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




BD9428 pdf, 반도체, 판매, 대치품
BD9428
Datasheet
Electrical Characteristics (Unless otherwise noted, Ta = 25oC, VCC=24V)
Parameter
Symbol
Min.
Limit
Typ.
Max.
Unit
Condition
[STB Block]
STB pin high-level voltage
STBH 2 - 35 V VSTB=SWEEP UP
STB pin low-level voltage
STB pin pull-down resistance
STBL
RSTB
-0.3 - 0.8 V VSTB=SWEEP DOWN
500 1000 1500 kVSTB=3V
[PWM Block]
PWM pin high-level voltage
PWMH
2
- 35 V VPWM=SWEEP UP
PWM pin low-level voltage
PWM pin pull-down resistance
PWML
RPWM
-0.3 - 0.8 V VPWM= SWEEP DOWN
180 300 420 kVPWM=3V
[Failure Indication Block (Open Drain)]
FAIL pin on resistance
RFAIL
250 500 1000 VFAIL=1V
FAIL pin leakage current
ILFAIL
-2 0
2 uA VFAIL=5V
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/25
TSZ02201-0F1F0C100290-1-2
16.Oct.2013 Rev.001

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BD9428 전자부품, 판매, 대치품
BD9428
Block Diagram
VIN CIN
VCC
VCC
CVCC STB
RT
SSFB
RSSFB
CSSFB
PWM
CREG10 0
REG10 0
REGULATOR
UVLO
(VCC)
TSD
OSDET
OVP SCP
+
OSC
PWM COMP
+
-
Control
Logic
Current
Sen se
FILTER
REG10 0
DRIVER
OVP
FAIL
N
CS
ERR AMP
-
-
-
-
+
Current driver
LED1
LED2
LED3
LED4
Datasheet
+
COUT
ISET
ISET
Open-Short
Detect
GND
OSDET
Figure 5. Block Diagram
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
7/25
TSZ02201-0F1F0C100290-1-2
16.Oct.2013 Rev.001

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