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BD9488F 데이터시트 PDF




ROHM Semiconductor에서 제조한 전자 부품 BD9488F은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 BD9488F 기능
기능 Boost 1channel white LED driver
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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 pdf, 반도체, 판매, 대치품
BD9488F
Datasheet
1.2 Electrical character (Unless otherwise specified Ta=25℃,VCC=12V)
Parameter
LED protection block
Symbol
Limit
Min. Typ. Max. Unit
LED OCP detect voltage VLEDOCP
LED OPEN detect voltage
Analog dimming block
ADIM_P pin HIGH
voltage
VOPEN
ADIM_PH
ADIM_P pin LOW voltage
ADIM_P pin input mask
voltage
ADIM_P pin pull-down
resistance
ADIM pin output voltage
H
ADIM_PL
ADIM_PPU
RADIM_P
ADIMH
ADIM pin output voltage L
ADIM pin output
resistance
ADIML
ADIMR
ADIM pin leak current
ILADIM
ISENSE pin leak current IL_ISENSE
Dimming signal output block
DIMOUT source
on-resistance
RONSO
DIMOUT sink
on-resistance
RONSI
TC54 block
3.8
0.05
2.0
-0.3
4.2
130
3.201
-
6.6
-2
-2
6.0
1.7
4.0 4.2
0.10 0.15
- 3.8
- 0.8
- 18
200 300
3.30 3.399
0.0 0.05
10 15
02
02
12.0 24.0
3.5 7.0
V
V
V
V
V
k
V
V
k
μA
μA
TC54 output voltage
TC54 available current
TC54_UVLO detect
voltage
TC54_UVLO hysteresis
TC54 discharge current
STB block
VTC54
|ITC54|
5.2
100
TC54_TH
TC54_HYS
TC54_DIS
2.232
50
5
5.4 5.6
--
2.4 2.568
100 200
10 15
V
μA
V
mV
μA
STB pin HIGH voltage
STBH
STB pin LOW voltage
STBL
STB pin input current
ISTB
PWM block
PWMpin HIGH Voltage PWM_H
PWMpin LOW Voltage
PWMpin Pull Down
resistance
PWM_L
RPWM
FAIL block (OPEN DRAIN)
FAILB pin on-resistance
RFAIL
FAILB pin leak current
ILFAIL
2.2 - 19
-0.3 - 0.8
2.0 3.0 4.5
2.0 - 18
-0.3 - 0.8
130 200 300
0.75 1.5 3.0
-2 0 2
V
V
μA
V
V
k
k
μA
Condition
VISENSE=SWEEP UP
VISENSE=SWEEP DOWN
VADIM_P=3.0V
ADIM_P=3.3V
ADIM_P=0.0V
VADIM=4V, ADIM_P=5.0V
VISENSE=4V
ION=-10mA
ION=10mA
IO=0mA
VSTB=H, TC54=SWEEP DOWN
VSTB=H->L, TC54=SWEEP UP
VSTB=H->L, TC54=4V
VSTB=SWEEP UP
VSTB=SWEEP DOWN
VSTB=3.0V
VPWM=SWEEP UP
VPWM=SWEEP DOWN
VPWM=3.0V
VFAIL=1.0V
VFAIL=15V
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/38
TSZ02201-0F1F0C100040-1-2
27.May 2014 Rev.003

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BD9488F 전자부품, 판매, 대치품
BD9488F
2.1.2 Pin ESD Type
FB
Internal
vol.
FB
CS
Datasheet
TC54
Internal
vol.
1k TC54
2.2 Block diagram
VCC
Figure 4-2. Internal equivalent circuit
VIN
TC54
STB
RT
VCC
VREG
REG54
UVLO
OSC
Css SS
FAILB
PWM1
PWM2
ADIM_P
SS
SS-FB
clamper
Fail
detect
+
-
4.0V
+
-
1.5V
ADIM
UVLO
VCC
UVLO
UVLO
TSD
OVP
OVP
PWM
COMP
CONTROL
LOGIC
Current
sense
VCC
GATE
CS
LEB
VCC
DIMOUT
OPEN LEDOCP
ERROR
amp
3.5V
ISENSE
FB
3.3V
10kΩ
GND
Package:SOP18
Figure 5. Block diagram
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
7/38
TSZ02201-0F1F0C100040-1-2
27.May 2014 Rev.003

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관련 데이터시트

부품번호상세설명 및 기능제조사
BD9488F

Boost 1channel white LED driver

ROHM Semiconductor
ROHM Semiconductor

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