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BD9285F PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD9285F
기능 Boost 1channel white LED driver
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BD9285F 데이터시트, 핀배열, 회로
Datasheet
Boost 1channel white LED driver
For large LCDs
BD9285F
General Description
BD9285F 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. BD9285F 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 BD9285F 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) and low-voltage
protection (SCP: short circuit protection) for the output
voltage Vout
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 This product is not designed protection against radioactive rays
.www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
1/36
TSZ02201-0F1F0C100030-1-2
11.Jul.2012 Rev.001




BD9285F pdf, 반도체, 판매, 대치품
BD9285F
Datasheet
1.2 Electrical character (Unless otherwise specified Ta=25℃,VCC=12V)
Limit
Parameter
Symbol
Min. Typ. Max. Unit
LED protection block
LED OCP detect voltage
VLEDOCP
3.8
4.0 4.2
V
LED OPEN detect voltage
Analog dimming block
VOPEN
0.05
0.10 0.15
V
ADIM_P pin HIGH voltage
ADIM_PH
2.0
- 3.8 V
ADIM_P pin LOW voltage
ADIM_PL
-0.3
-
0.8 V
ADIM_P pin input mask
voltage
ADIM_PPU
4.2
- 5.6 V
ADIM_P pin pull-down
resistance
RADIM_P 130 200 300 kΩ
ADIM pin output voltage H
ADIMH
3.201 3.30 3.399
V
ADIM pin output voltage L
ADIML
-
0.0 0.05
V
ADIM pin output resistance
ADIMR
6.6 10 15 kΩ
ADIM pin leak current
ILADIM -2 0 2 μA
ISENSE pin leak current
IL_ISENSE
-2
0 2 μA
Dimming signal output block
DIMOUT
source
on-resistance
RONSO
6.0 12.0 24.0 Ω
DIMOUT sink on-resistance
TC54 block
RONSI
1.7 3.5 7.0 Ω
TC54 output voltage
VTC54
5.2 5.4 5.6 V
TC54 available current
|ITC54| 100 -
- μA
TC54_UVLO detect voltage
TC54_TH
2.232
2.4 2.568
V
TC54_UVLO hysteresis
TC54_HYS 50 100 200 mV
TC54 discharge current
STB block
TC54_DIS
5
10 15 μA
STB pin HIGH voltage
STBH
2.2 - 19 V
STB pin LOW voltage
STBL
-0.3 - 0.8 V
STB pin input current
PWM block
ISTB
2.0 3.0 4.5 μA
PWMpin HIGH Voltage
PWM_H 2.0 - 5.0 V
PWMpin LOW Voltage
PWM pin Pull Down
resistance
PWM_L
RPWM
FAIL block (OPEN DRAIN)
-0.3 - 0.8 V
130 200 300 kΩ
FAILB pin on-resistance
RFAIL
0.75 1.5 3.0 kΩ
FAILB pin leak current
ILFAIL
-2 0 2 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
4/36
TSZ02201-0F1F0C100030-1-2
11.Jul.2012 Rev.001

4페이지










BD9285F 전자부품, 판매, 대치품
BD9285F
2.1.2 Pin ESD Type
FB
Datasheet
CS TC54
Internal
vol.
TC54
1k
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
OVP
VCC
UVLO
TSD
SCP
OVP
UVLO
PWM
COMP
CONTROL
LOGIC
Current
sense
VCC
GATE
CS
LEB
VCC
DIMOUT
OPEN LEDOCP
ERROR
amp
3.5V
ISENSE
FB
3.3V
10kΩ
GND
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
Package:SOP18
Figure 5. Block diagram
7/36
TSZ02201-0F1F0C100030-1-2
11.Jul.2012 Rev.001

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부품번호상세설명 및 기능제조사
BD9285F

Boost 1channel white LED driver

Rohm
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