|
|
PDF BD9409F Data sheet ( Hoja de datos )
| Número de pieza | BD9409F | |
| Descripción | White LED Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de BD9409F (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
Datasheet
LED Drivers for LCD Backlights
1ch Boost up type
White LED Driver for large LCD
BD9409F
1.1 General Description
BD9409F is a high efficiency driver for white LEDs and is
designed for large LCDs. BD9409F has a boost DCDC
converter that employs an array of LEDs as the light
source.
BD9409F 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:
11.5V to 35.0V
Oscillator frequency of DCDC: 150kHz (RT=100kΩ)
Operating Current:
2.8 mA(Typ.)
Operating temperature range:
-40°C to +105°C
1.2 Package(s)
SOP16
W(Typ) x D(Typ) x H(Max)
10.00mm x 6.20mm x 1.71mm
Pin pitch 1.27mm
Features
DCDC converter with current mode
LED protection circuit (Over boost protection(FB_H),
LED OCP protection)
Over-voltage protection (OVP) for the output voltage
Vout
Adjustable soft start
Adjustable oscillation frequency of DCDC
UVLO detection for the input voltage of the power
stage
PWM Dimming and MS Dimming.
Applications
TV, Computer Display, LCD Backlighting
Figure 1. SOP16
Typical Application Circuit
VCC
VIN
Vout
VCC UVLO OVP
REG90
STB GATE
RT CS
SS
FAIL
DIMOUT
PWM
MS
ISENSE
FB
GND
Rs
Figure 2. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has not designed protection against radioactive rays
1/33
TSZ02201-0T2T0C100230-1-2
01.Nov.2016 Rev.001
1 page  
BD9409F
1.8 Electrical Characteristics 2/2 (Unless otherwise specified VCC=24V Ta=25°C)
Parameter
Symbol
Min Typ Max Unit
【DC/DC Block】
FB Source Current
IFBSO
-115 -100 -85
μA
FB Sink Current
IFBSI
85 100 115
【DC/DC Protection Block】
OCP Detect Voltage
VCS1
360 400 440
OCP Latch OFF Detect Voltage
VCS2
0.85 1.00 1.15
OVP Detect Voltage
VOVP
2.88 3.00 3.12
OVP Detect Hysteresis
VOVP_HYS 150 200 250
OVP Pin Leak Current
OVP_LK -1.8 0 1.8
【LED Protection Block】
LED OCP Detect Voltage
VLEDOCP
2.88 3.00 3.12
Over Boost Detection Voltage
VFBH
3.84 4.00 4.16
【Dimming Block】
MS Pin Leak Current
ILMS
-1.8 0 1.8
ISENSE Pin Leak Current
DIMOUT Source ON
Resistance
DIMOUT Sink ON Resistance
MS Pin HIGH Voltage
(Active mode)
MS Pin LOW Voltage
(Stand-by mode)
【REG90 Block】
IL_ISENSE
RONSO
RONSI
VMS_H
VMS_L
-2
5.0
4.0
0.70
-0.25
0
10.0
8.0
-
-
2
20.0
16.0
20
0.25
REG90 Output Voltage 1
REG90_1
8.91 9.00 9.09
REG90 Output Voltage 2
REG90 Available Source
Current
REG90_2
| IREG90 |
8.865 9.00 9.135
15 -
-
REG90_UVLO Detect Voltage REG90_TH 5.22 6.00 6.78
μA
mV
V
V
mV
μA
V
V
μA
μA
Ω
Ω
V
V
V
V
mA
V
REG90 Discharge Resistance
【STB Block】
STB Pin HIGH Voltage
STB Pin LOW Voltage
STB Pull Down Resistance
【PWM Block】
PWM Pin HIGH Voltage
PWM Pin LOW Voltage
PWM Pin Pull Down Resistance
【Filter Block】
Abnormal Detection Timer
AUTO Timer
【FAIL Block 】
Pull Up Resistance of
FAILB Pin Latch Off
REG90_DIS
STBH
STBL
RSTB
PWM_H
PWM_L
RPWM
tCP
tAUTO
RFAIL
13.2
2.0
-0.3
600
1.5
-0.3
600
-
-
-
22.0 30.8
-
-
1000
18
0.8
1400
-
-
1000
18
0.8
1400
20 -
655 -
3.0 6.0
kΩ
V
V
kΩ
V
V
kΩ
ms
ms
kΩ
Conditions
VISENSE=0.0V, VMS=3.0V,
VFB=1.0V
VISENSE=2.0V, VMS=3.0V,
VFB=1.0V
CS=SWEEP UP
CS=SWEEP UP
VOVP SWEEP UP
VOVP SWEEP DOWN
VOVP=4.0V, VSTB=3.0V
VISENSE=SWEEP UP
VFB=SWEEP UP
VMS=2.0V
VISENSE=4.0V
MS=Sweep up
MS=Sweep down
IO=0mA
IO=-15mA
VREG90=SWEEP DOWN,
VSTB=0V
STB=MS=ON->OFF,
REG90=8.0V, PWM=H
VSTB=3.0V
VPWM=3.0V
FCT=200kHz
FCT=200kHz
CS=1.15V
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/33
TSZ02201-0T2T0C100230-1-2
01.Nov.2016 Rev.001
5 Page 
BD9409F
2.6 List of The Protection Function Detection Condition (Typ Condition)
Protect
function
Detection
pin
Detect condition
Detection condition PWM
SS
Release
condition
FBMAX
FB
FB > 4.0V
H(4clk) SS>3.7V
FB < 4.0V
LED OCP
RT GND
SHORT
ISENSE
RT
ISENSE > 3.0V
RT<VRT×90%
- - ISENSE < 3.0V
--
Release
RT=GND
Timer
operation
212clk
4clk
NO
Protection type
Auto-restart after detection
(Judge periodically
whether normal or not)
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
VCC UVLO
VCC
VCC<10.2V
- - VCC>10.5V NO
Restart by release
OVP
OVP
OVP>3.0V
Auto-restart after detection
-
-
OVP<2.8V
4clk
(Judge periodically
whether normal or not)
OCP
CS
CS>0.4V
--
- NO Pulse by pulse
Auto-restart after detection
OCP LATCH
CS
CS>1.0V
--
CS<1.0V 4clk (Judge periodically
whether normal or not)
To reset the latch type 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.
Auto-restart clock = 217clk = 131072clk.
2.7 List of The Protection Function Operation
Protect function
FBMAX
LED OCP
RT GND SHORT
DC/DC gate
output
Stop after latch
Stop immediately
Stop immediately
Operation of the protect function
Dimming transistor
(DIMOUT) logic
SS pin
Low after latch
Discharge after latch
Immediately high,
Low after latch
Discharge after latch
Immediately low
Not discharge
RT HIGH SHORT
STB
MS_STB
UVLO
Stop immediately
Stop immediately
Stop immediately
Stop immediately
Immediately low
Low after REG90UVLO
detects
Low after REG90UVLO
detects
Immediately low
Not discharge
Discharge immediately
Discharge immediately
Discharge immediately
REG90UVLO
Stop immediately
Immediately low
Discharge immediately
VCC UVLO
Stop immediately
Immediately low
Discharge immediately
OVP
Stop immediately
Immediately low
Discharge after latch
OCP
Stop immediately
Normal operation
Not discharge
OCP LATCH
Stop after latch
Low after latch
Please refer to section “3.5 Timing Chart” for details.
Discharge after latch
FAIL pin
High after timer latch
High after timer latch
Low
Low
Low
Low
Low
Low
Low
High after timer latch
Low
High after timer latch
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/33
TSZ02201-0T2T0C100230-1-2
01.Nov.2016 Rev.001
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BD9409F.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| BD9409F | White LED Driver | ROHM Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |