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PDF BD9411F Data sheet ( Hoja de datos )
| Número de pieza | BD9411F | |
| Descripción | White LED Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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LED Drivers for LCD Backlights
1ch Boost up Type
White LED Driver for large LCD
BD9411F
General Description
BD9411F is a high efficiency driver for white LEDs and is
designed for large LCDs. BD9411F has a boost DCDC
converter that employs an array of LEDs as the light
source.
BD9411F has some protect functions against fault
conditions, such as over-voltage protection (OVP), over
current limit protection of DCDC (OCP), LED OCP
protection, and over-boost protection (FBMAX).
Therefore it 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
Oscillator frequency of DCDC: 150kHz (RT=100kΩ)
Operating Current:
3.3 mA(Typ)
Operating temperature range:
-40°C to +105°C
Package(s)
SOP18
W(Typ) x D(Typ) x H(Max)
11.20mm x 7.80mm x 2.01mm
Pin pitch 1.27mm
Features
DCDC converter with current mode
LED protection circuit (Over boost protection, LED
OCP protection)
Over-voltage protection (OVP) for the output voltage
VOUT
Adjustable soft start
Adjustable oscillation frequency of DCDC
Wide range of analog dimming 0.2V to 3.0V
UVLO detection for the input voltage of the power
stage
LED Dimming PWM Over Duty Protection(ODP)
Applications
TV, Computer Display, LCD Backlighting
Figure 1. SOP18
Typical Application Circuit
VCC
VIN
VOUT
VCC
UVLO OVP
REG90
STB
GATE
RT
CS
SS
FAIL
PWM
DIMOUT
ADIM
ISENSE
DUTYP
DUTYON
GND
FB
Rs
Figure 2. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2017 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has not designed protection against radioactive rays
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TSZ02201-0T2T0C100250-1-2
20.Feb.2017 Rev.001
1 page  
BD9411F
Electrical Characteristics (Unless otherwise specified VCC=24V Tj=25°C)
Parameter
Symbol
Min Typ Max Unit
Conditions
【Total Current Consumption】
Circuit Current
Circuit Current (standby)
【UVLO Block】
ICC － 3.3 6.6 mA VSTB=3.0V, PWM=3.0V
IST － 40 80 μA VSTB=0V
Operation Voltage（VCC）
Hysteresis Voltage（VCC）
VUVLO_VCC
VUHYS_VCC
6.5 7.5 8.5
V VCC=SWEEP UP
150 300 600 mV VCC=SWEEP DOWN
UVLO Release Voltage
VUVLO
2.88 3.00 3.12
V VUVLO=SWEEP UP
UVLO Hysteresis Voltage
UVLO Pin Leak Current
【DC/DC Block】
VUHYS
IVUVLO_LK
250 300 350 mV VUVLO=SWEEP DOWN
-2 0 2 μA VUVLO=4.0V
ISENSE Threshold Voltage 1
VLED1
0.225 0.233 0.242
V VADIM=0.7V
ISENSE Threshold Voltage 2
VLED2
0.656 0.667 0.677
V VADIM=2.0V
ISENSE Threshold Voltage 3
ISENSE Clamp Voltage
Oscillation Frequency
RT Short Protection Range
RT Terminal Voltage
GATE Pin MAX DUTY Output
GATE Pin ON Resistance
(as source)
GATE Pin ON Resistance
(as sink)
SS Pin Source Current
SS Pin ON Resistance at OFF
VLED3
VLED4
FCT
VRT_DET
VRT
DMAX_DUTY
RON_GSO
RON_GSI
ISSSO
RSS_L
0.988
0.990
142.5
-0.3
1.6
90
2.5
1.000
1.015
150
-
2.0
95
5.0
1.012
1.040
157.5
VRT
×90%
2.4
99
10.0
2.0 4.0 8.0
-3.75 -3.0 -2.25
- 3.0 5.0
V VADIM=3.0V
V
VADIM=3.3V
(as masking analog dimming)
kHz RT=100kΩ
V RT=SWEEP DOWN
V RT=100kΩ
% RT=100kΩ
Ω
Ω
μA VSS=2.0V
kΩ
Soft Start Ended Voltage
【DC/DC Block】
VSS_END
3.52 3.70 3.88
V SS=SWEEP UP
FB Source Current
FB Sink Current
【DC/DC Protection Block】
IFBSO
IFBSI
-115
85
-100
100
-85
115
μA
VISENSE=0.2V, VADIM=3.0V,
VFB=1.0V
μA
VISENSE=2.0V, VADIM=3.0V,
VFB=1.0V
OCP Detect Voltage1
VCS1
360 400 440 mV CS=SWEEP UP, Pulse by pulse
OCP Detect Voltage2
VCS2
0.85 1.00 1.15
V CS=SWEEP UP
OVP Detect Voltage
VOVP
2.88 3.00 3.12
V VOVP SWEEP UP
OVP Detect Hysteresis
OVP Pin Leak Current
VOVP_HYS
IOVP_LK
150 200 250 mV VOVP SWEEP DOWN
-2 0 2 μA VOVP=4.0V, VSTB=3.0V
【LED Protection Block】
LED OCP Detect Voltage
VLEDOCP
2.88 3.00 3.12
V VISENSE=SWEEP UP
Over Boost Detection Voltage
【Dimming Block】
VFBH
3.84 4.00 4.16
V VFB=SWEEP UP
ADIM Pin Leak Current
ISENSE Pin Leak Current
DIMOUT Source ON
Resistance
DIMOUT Sink ON Resistance
【REG90 Block】
ILADIM
IL_ISENSE
RON_DIMSO
RON_DIMSI
-2 0 2 μA VADIM=2.0V
-2 0 2 μA VISENSE=4.0V
5.0 10.0 20.0
Ω
4.0 8.0 16.0 Ω
REG90 Output Voltage 1
VREG90_1
8.91 9.00 9.09
V IO=0mA
REG90 Output Voltage 2
VREG90_2
8.865 9.00 9.135
V IO=-15mA
REG90 Available Current
REG90_UVLO Detect Voltage
REG90 Discharge Resistance
| IREG90 |
VREG90_TH
VREG90_DIS
15 -
-
5.22 6.00 6.78
13.2 22.0 30.8
mA
V
VREG90=SWEEP DOWN,
VSTB=0V
kΩ
STB=ON->OFF, VREG90=8.0V,
PWM=L
www.rohm.com
© 2017 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/34
TSZ02201-0T2T0C100250-1-2
20.Feb.2017 Rev.001
5 Page 
BD9411F
List of The Protection Function Detection Condition (Typ Condition)
Protect
function
Detection
pin
Detect condition
Detection condition PWM
SS
FBMAX
FB
FB > 4.0V
H(4clk) SS>3.7V
Release
condition
FB < 4.0V
Timer
operation
214clk
LED OCP
RT GND
SHORT
ISENSE
RT
ISENSE > 3.0V
RT<VRT×90%
-
-
ISENSE < 3.0V
4clk
--
Release
RT=GND
NO
Protection Type
Immediately auto-restart
after detection
(Judge periodically
whether normal or not)
Immediately auto-restart
after detection
(Judge periodically
whether normal or not)
Restart by release
RT HIGH
SHORT
RT
RT>5V
-
-
Release
RT=HIGH
NO
Restart by release
UVLO
UVLO
UVLO<2.7V
-
-
UVLO>3.0V
NO
Restart by release
REG90UVLO REG90
REG90<6.0V
- - REG90>6.5V NO
Restart by release
VCCUVLO
VCC
VCC<7.2V
-
-
VCC>7.5V
NO
Restart by release
OVP
OVP
OVP>3.0V
Immediately auto-restart
-
-
OVP<2.8V
4clk
after detection
(Judge periodically
whether normal or not)
OCP
CS
CS>0.4V
--
- NO Pulse by pulse
Immediately auto-restart
OCP
detection2
CS
CS>1.0V
--
CS<1.0V
4clk
after detection
(Judge periodically
whether normal or not)
DUTYP GND
SHORT
DUTYP DUTYP <VDUTYP×90%
-
-
Release
DUTYP=GND
NO
Restart by release
DUTYP HIGH
SHORT
DUTYP
DUTYP >5V
-
-
Release
DUTYP=HIGH
NO
Restart by release
DUTYON=H
ODP(*1)
PWM
and
PWM on duty > setting
H
-
- NO Cycle by cycle
duty by DUTYP resistor
To reset the FBMAX, LED OCP, OVP and OCP detection2 protection, please set STB logic to ‘L’ once. Otherwise the detection of
VCCUVLO, REG90UVLO is required.
The clock number of timer operation corresponds to the boost pulse clock.
(*1) When PWM Duty count start, PWM=H → L is input, when PWM=L → H is input, the ODP is reset.
The GATE output, the DIMOUT output maintain L until PWM=H → L is input in PWM = 100% again when ODP works once.
List of The Protection Function Operation
Protect function
FBMAX
LED OCP
DC/DC gate
output
Stop after timer
operation
Stop immediately
RT GND SHORT
RT HIGH SHORT
Stop immediately
Stop immediately
STB
Stop immediately
UVLO
REG90UVLO
VCC UVLO
Stop immediately
Stop immediately
Stop immediately
OVP
Stop immediately
OCP
OCP detection2
DUTYP GND SHORT
Stop immediately
Stop after timer
operation
Stop immediately
DUTYP HIGH SHORT
Stop immediately
ODP
Immediately low
Please refer to “Timing Chart” section for details.
Operation of the protect function
Dimming transistor
(DIMOUT) logic
Low after timer operation
Immediately high,
Low after timer operation
SS pin
Discharge after timer
operation
Discharge after timer
operation
Immediately low
Not discharge
Immediately low
Low after REG90UVLO
detects
Immediately low
Not discharge
Discharge immediately
Discharge immediately
Immediately low
Discharge immediately
Immediately low
Immediately low
Normal operation
Low after timer operation
Immediately low
Discharge immediately
Discharge after timer
operation
Not discharge
Discharge after timer
operation
Not discharge
Immediately low
Not discharge
Immediately low
Not discharge
FAIL pin
High after timer
operation
High after timer
operation
Low
Low
Low
Low
Low
Low
Low
Low
High after timer
operation
Low
Low
Low
www.rohm.com
© 2017 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/34
TSZ02201-0T2T0C100250-1-2
20.Feb.2017 Rev.001
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BD9411F.PDF ] | |
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