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BD9488F 반도체 회로 부품 판매점

Boost 1channel white LED driver



ROHM Semiconductor 로고
ROHM Semiconductor
BD9488F 데이터시트, 핀배열, 회로
Datasheet
Boost 1channel white LED driver
For large LCDs
BD9488F
General Description
BD9488F 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. BD9488F has some protect function against
fault conditions, such as the over-voltage protection
(OVP), the over current limit protection of DCDC (OCP),
LED over current protection (LEDOCP), the open
detection of LED string. Therefore BD9488F is available
for the fail-safe design over a wide range output voltage.
Features
Current mode DCDC converter
Vout discharge circuit as shutdown
LED protection circuit (OPEN protection, LED OCP
protection)
LED protect detection as small PWM dimming signal
Over-voltage protection (OVP) for the output voltage.
Adjustable soft start time constant
The wide range of analog dimming 0.2V-3.5V
The built-in transformation circuit from pulse to DC
2 PWM dimming signal
The UVLO detection for the input voltage of the power
stage
FAIL logic output
Applications
TV, PC display and other LCD backlight system.
Key Specifications
Input voltage range:
9.0V to 18.0V
DCDC oscillation frequency: 150kHz (RT=100kΩ)
Active current consumption:
1.2mA(Typ.)
Operating temperature range:
-40to +85
Package(s)
SOP18
W(Typ.) x D(Typ.) x H(Max.)
11.20mm x 7.80mm x 2.01mm
Pin pitch 1.27mm
Figure 1. SOP18
Typical Application Circuit(s)
VCC
VIN
VCC
TC54
UVLO OVP
STB
RT
Css
SS
GATE
CS
FAILB
PWM1
DIMOUT
PWM2
ADIM_P
ADIM
GND
ISENSE
FB
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
1/38
TSZ02201-0F1F0C100040-1-2
27.May 2014 Rev.003


BD9488F 데이터시트, 핀배열, 회로
BD9488F
Absolute Maximum Ratings (Ta=25)
Parameter
Input voltage
STB pin voltage
OVP, UVLO, SS, RT,
ISENSE, FB, CS, TC54
pin voltage
PWM1, PWM2, FAILB,
ADIM, ADIM_P pin voltage
DIMOUT, GATE pin voltage
Symbol
Vccmax
STB
OVP, UVLO, SS, RT,
ISENSE, FB, CS, TC54
PWM1, PWM2, FAILB,
ADIM, ADIM_P
DIMOUT, GATE
Power Dissipation
Pd
Operating Temperature Range
Topr
Junction Temperature
Tjmax
Storage Temperature Range
Tstg
*1 Pd derated at 5.5 mW/for temperature above Ta=25,
mounted on 70mm×70mm×1.6mm 1 layer glass-epoxy PCB.
Operation range
Parameter
VCC Power source voltage
DC/DC oscillation frequency
The effective range of ADIM signal
PWM input frequency range
Symbol
VCC
fsw
VADIM
FPWM
Ratings
20
VCC
7
20
VCC
687 (*1)
-40 to +85
150
-55 to +150
Range
9.0 to 18.0
50 to 800
0.2 to 3.5
90 to 100k
Datasheet
Unit
V
V
V
V
V
mW
Unit
V
kHz
V
Hz
Pin Configuration
Package dimension, marking diagram
OVP
UVLO
SS
RT
PWM1
PWM2
FAILB
ADIM
ADIM_P
1
2
3
4
5
6
7
8
9
18 TC54
17 CS
16 FB
15 ISENSE
14 VCC
13 STB
12 GATE
11 DIMOUT
10 GND
BD9488F
Lot No.
Figure 3-1. Pin configuration
Figure 3-2. Package dimension
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
2/38
TSZ02201-0F1F0C100040-1-2
27.May 2014 Rev.003




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Boost 1channel white LED driver - ROHM Semiconductor