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BD9470AFM PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 BD9470AFM
기능 White LED driver
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BD9470AFM 데이터시트, 핀배열, 회로
Datasheet
LED driver series for LCD back light
White LED driver for medium sized
and large sized LCD back light
BD9470AEFVBD9470AFM
General Description
BD9470AEFV and BD9470AFM are high efficiency
driver for white LED. They are designed for large sized
LCD. BD9470AEFV and BD9470AFM are built-in
DCDC converter that supply appropriate voltage for
light source.
BD9470AEFV and BD9470AFM are also built-in
protection function for abnormal state such as OVP:
over voltage protection, OCP: over current limit
protection of DCDC, SCP: short circuit protection, open
detection of LED string.
Thus they are used for conditions of large output
voltage and load conditions.
Features
6ch LED constant current driver
LED maximum output current 250mA
Individual PWM dimming modulation allowed for
LEDs
±2% LED current accuracy (when each LED is set
to 130mA)
Built-in LED feedback voltage automatic adjustment
circuit according to LED current
Built-in start-up circuit independent of PWM light
modulation
built-in VOUT FB voltage maintenance function
when PWM=Low0%
Built-in LED current stabilization circuit while
scanning operation is performed
Built-in VOUT discharge circuit while shutdown
Built-in LED protection (OPEN / SHORT protection)
Individual detection and individual LED OFF for
both open and short circuit
Adjustable LED short-circuit protection threshold
PWM-independent LED protection
VOUT over voltage protection (OVP) and reduced
voltage protection (SCP) circuit
Built-in failure indication function
Built-in ISET pin short-circuit protection circuit
Typical Application Circuit
VIN
ISET
SS
PWM1
FB
PWM2
RT
PWM3
DCDC_GND
PWM4
N
PWM5
CS
PWM
PWM6
REG58
Key Specifications
VCC supply Voltage range:
9.0V35.0V
LED minimum output current:
40mA
LED maximum output current:
250mA
DCDC oscillation frequency: 150KHz(RT=100Kohm)
Operation circuit current:
6mA(typ.)
Operating temperature range:
-40℃~85
Applications
LED driver for TV, monitor and LCD back light
Package
HSOP-M28
HTSSOP-B28
W (Typ.) x D(Typ.) x H(Max.)
18.50mm x 9.90mm x 2.41mm
9.70mm x 6.40mm x 1.00mm
Figure 1. HSOP-M28
Figure 2. HTSSOP-B28
GND VCC
STB
FAIL
FAIL STB
OVP
LSP
LED6
UVLO
LED5
LED1
LED4
LED2
LED_GND
LED3
Figure 3. 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
1/35
TSZ02201-0F10C1002000-1-2
19.Oct.2013 Rev.003




BD9470AFM pdf, 반도체, 판매, 대치품
BD9470AFMBD9470AEFV
Electrical Characteristics (unless otherwise specified, Ta = 25°C, VCC=24V )
Parameter
Symbol
Specification
Min Typ Max
Whole Device
unit
Condition
Operation Circuit
Icc 5.5 8.5 mA STB=3V, PWM1-6=3.3V
Standby current
UVLO Block
IST 40 80 μA STB=0V
Operating voltage (VCC
VUVLO_VCC
6.5
7.5
8.5 V VCC=SWEEP UP
Hysteresis voltage VCC
VUHYS_VCC 150 300 600 mV VCC=SWEEP DOWN
UVLO release voltage
VUVLO_U
2.88 3.00 3.12 V VUVLO=SWEEP UP
UVLO hysteresis voltage
VUHYS_U
250 300 350 mV VUVLO=SWEEP DOWN
UVLO pin leakage current
DC/DC Block
Error amp. Reference
(Min)
Error amp. basic
(ILED=130mA)
voltage
voltage
Oscillation frequency
UVLO_LK
VLED
VLED
FCT
-2 0 2 μA VUVLO=4V
0.36
0.428
142.5
0.40
0.450
150
0.44
0.472
157. 5
V
LEDx Terminal ILEDx =
40mA
V
LEDx Terminal ILEDx =
130mA
KHz RT=100kohm
Max. duty cycle of output N
NMAX_DUTY
90
95
99 % RT=100kohm
RT short protection range
On resistance on N pin source
side
On resistance on N pin sink side
RT_DET
RONSO
RONSI
-0.3 - VRT×90% V RT=SWEEP DOWN
1.5 3
6Ω
1.5 3
6Ω
RT pin voltage
VRT
1 1.5 2 V RT=100kohm
SS pin source current
ISSSO
-2.6 -2.0 -1.4 μA VSS=2V
Soft start completion voltage
VSS_END
3.52 3.70 3.88 V SS=SWEEP UP
FB source current
FB sink current
FB source mode
SS pin input voltage range
FB sink/source mode
SS pin input voltage range
Over current detect voltage
IFBSO
IFBSI
FB_SO_SS
FB_SOSI_SS
VCS
-115
70
4.9
3.9
372
-100
100
-
-
400
-85 μA VLED=0V, VFB=1.0V
130
μA
VLED=5.0V(ALL_CH),
VFB=1.0V,VSS=4V
- V SS=SWEEP UP
4.4 V SS=SWEEP DOWN
428 mV CS=SWEEP UP
CS source current
DC/DC protection Block
OVP Detect Voltage (DCDC
Stop)
OVP protection timer release
ICS 15 30 60 μA VCS=0V
VOVP
VOVP_CAN
2.90 3.00 3.10 V
VOVP-0.14 VOVP-0.1 VOVP-0.04 V
VOVP SWEEP UP
VOVP SWEEP DOWN
Short protection detect voltage
VSCP
0.05 0.1 0.15 V VOVP SWEEP DOWN
OVP pin leakage current
OVP_LK
-2 0 2 μA VOVP=4V
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/35
TSZ02201-0F10C1002000-1-2
19.Oct.2013 Rev.003

4페이지










BD9470AFM 전자부품, 판매, 대치품
BD9470AFMBD9470AEFV
Internal Equivalent Circuit Diagrams
REG58 / N / CS / DCDC_GND
REG58
N
DCDC_GND
CS
OVP
4k
100k
5V
OVP
SS
SS
ISET
ISET
FB
FB
RT
RT
STB
STB
1M
5V 1M
FAIL
FAIL
500
UVLO
UVLO
1M
5V
LED1-6/LED_GND
LED1-6
LED_GND
PWM
100k
5V
2M
PWM1-6
LSP
4V
3.1M
100k
LSP
5V 900k
Figure 6. Internal Equivalent Circuit Diagrams
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
7/35
TSZ02201-0F10C1002000-1-2
19.Oct.2013 Rev.003

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부품번호상세설명 및 기능제조사
BD9470AFM

White LED driver

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