LED Driver Series for LCD Backlight
White backlight LED drivers
for medium to large LCD panels
(SWREG type)
BD9202EFS
No.09040EAT01
●Description
BD9202EFS is the LED driver IC which loads the step-up DCDC controller and the constant electric current driver of 8ch.
As for the constant electric current driver, PWM modulated light of 10bit gradation (1024stages) is possible with the register
setting from 4 line serial interfaces.
Because it can adjust brightness with every channel, back light is controlled in every area according to the light and shade
of the picture, rise of contrast ratio is actualized.
●Features
1)8ch
constant
electric current driver built-in
・
Largest drive electric current 150mA/CH *2
・10bit
gradation (1024 stages) modulated light is possible by register setting
・To
input the standard CLK of PWM from outside is possible (BCT_SYNC_IN terminal)
・Because
it is high output resisting pressure (60V), the multi-stage connection of LED is p ossi b le
・Detecting
abnormal mode with LED opening detection
2)Step-up DCDC controller built-in
3) UVLO function
4) 4 line serial interface
5) HTSSOP-A44 Package
●Applications
For the equipment of loading LCD indicator of TV, monitor and note PC and the like
●Absolute
maximum rating (Ta=25℃)
Parameter
Power supply voltage
LED1½8 terminal voltage
EN,LOADSW terminal voltage
FAIL1,FAIL2 terminal voltage
VREF,ISET,VSET,TEST,BRT,RT,
CS,UVLO,COMP,CP1,CP2,TOUT1,
TOUT2,SWOUT,OVP,CT_SYNC_IN,
CT_SYNC_OUT,BCT_SYNC_IN,
BCT_SYNC_OUT terminal voltage
CPUDI,CPUCLK,CPUCS,CPUDO
terminal voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
LED Maximum Current
Symbol
VCC
CPUVDD
VREG
VLED1½8
VEN,VLOADSW
V
FAIL1,
V
FAIL2
V
VREF,
V
ISET,
V
VSET,
V
TEST,
V
BRT,
V
RT,
V
CS,
V
UVLO,
V
COMP,
V
CP1,
V
CP2,
V
TOUT1,
V
TOUT2,
V
SWOUT,
V
OVP
V
CT_SYNC_IN,
V
CT_SYNC_OUT,
V
BCT_SYNC_IN,
V
BCT_SYNC_OUT
V
CPUDI,
V
CPUCLK,
V
CPUCS,
V
CPUDO
Pd
Topr
Tstg
ILED
Rating
36
5.5
5.5
60
36
7
Unit
V
V
V
V
V
V
-0.3½5.5＜
VREG
V
-0.3½5.5＜
CPUVDD
4.5 *1
-40½+85
-55½+150
150 *2 *3
V
W
℃
℃
mA
*1At the time of mounting 2 layer glass epoxy base-plate of 70mm×70mm×1.6mm, 36.0mW is reduced at 1
℃
above Ta=25.
*2 When the VF variation of LED is large, the loss quantity with the driver will increase, because there are times when package
temperature rises, please do the base-plate design after considering heat dissipation measure sufficiently.
*3It is the electric current quantity per 1ch.
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© 2009 ROHM Co., Ltd. All rights reserved.
1/19
2009.04 - Rev.A
BD9202EFS
●Operating
condition (Ta=25℃)
Parameter
Power supply voltage
CPUVDD
CT oscillation frequency setting range
CT_SYNC_IN input frequency range *4*5
BCT oscillation frequency setting range
BCT_SYNC_IN input frequency range *4*5
VSET Input potential
fCT
FCT_SYNC_IN
fBCT
FBCT_SYNC_I
VSET
2.7½5.5
300½800
fCT½800
100½1000
fBCT½1000
0.9½2.4
V
kHz
kHz
kHz
kHz
V
Symbol
VREG
Voltage range
5.25½5.5
Unit
V
Technical Note
*4 When not using external frequency input, please connect the terminal of CT_SYNC_IN, BCT_SYNC_IN to GND.
*5When using external frequency input, please do not do the operation that is changed to internal oscillation
frequency on midway.
●
Electric characteristic
（(Unless
otherwise specified Ta=25℃，VCC=24V，VREG=5V,
Parameter
【All
the circuit electric currents】
Symbol
Min
6
-
4.8
5
1.57
-
-
CPUVDD=3V）
Limit
Typ
Max
13
0
5
12
1.60
7
2
Unit
Condition
VCC=24V
CPUVDD=3V, EN=3V
LED1½8=OFF
EN=0V
Io=0mA,CREG=2.2uF
At the time of external impressing of
VREG=5.25VAt
LED1½8=OFF,EN=3V
Circuit electric currents
Stand-by electric current
【VREG
section】
Icc
IST
VREG
IREG
VREF
RONH
RONL
21
10
5.2
20
1.63
-
-
mA
uA
V
mA
V
Ω
Ω
VREG Output voltage
VREG
VREG sink electric current
VREF Output voltage
【Switching
section】
Io=0uA
ION=-10mA
ION=10mA
SWOUT Source value of resistance
SWOUT Sink value of resistance
【OCP
section】
Over-current protective operating
voltage
【Error
amplifier section】
LED Control voltage
COMP Sink electric current
COMP Source electric current
【CT
Oscillator section】
CT Oscillation frequency
CT_SYNC_IN input High voltage
CT_SYNC_IN input low voltage
CT_SYNC_OUT output high voltage
CT_SYNC_OUT output low voltage
【BCT
Oscillator section】
BCT Oscillation frequency
BCT_SYNC_IN input High voltage
BCT_SYNC_IN input low voltage
BCT_SYNC_OUT output high voltage
BCT_SYNC_OUT output low voltage
【OVP
section】
Over-voltage detection reference voltage
OVP Hysteresis voltage
【UVLO
section】
UVLO (VREG) Detection voltage
UVLO (VREG) Hysteresis voltage
UVLO(EXT) Detection voltage
UVLO(EXT) Hysteresis voltage
VOLIMIT
VLED
ICOMPSINK
ICOMPSOURCE
FCT
VSYNC_INH
VSYNC_INL
VSYNC_OUTH
VSYNC_OUTL
0.1
0.55
40
-200
500
VREG
×0.7
-0.3
VREG
-1.0
-
0.2
0.75
100
-100
600
-
-
VREG
–0.15
0.1
0.3
0.95
200
-40
V
V
uA
uA
Vcs=Sweep up
VLED=2V,Vcomp=1V
VLED=0V,Vcomp=1V
700
VREG
+0.3
VREG
×0.3
-
0.5
kHz
V
V
V
V
RT=51kΩ
IOL=-1mA
IOL=1mA
FBCT
VBSYNC_INH
VBSYNC_INL
VBSYNC_OUTH
VBSYNC_OUTL
500
VREG
×0.7
-0.3
VREG
-1.0
-
1.85
0.4
2.6
50
1.7
50
600
-
-
VREG
–0.15
0.1
2.0
0.5
2.9
100
1.9
100
700
VREG
+0.3
VREG
×0.3
-
0.5
2.15
0.6
3.2
200
2.1
200
kHz
V
V
V
V
V
V
V
mV
V
mV
BRT=51kΩ
IOL=-1mA
IOL=1mA
VOVP=Sweep up
VOVP=Sweep down
VREG=Sweep down
VREG=Sweep up
UVLO=sweep down
UVLO=sweep up
VOVP
VOVPHYS
VUVLO_VREG
VUHYS_VREG
VUVLO_EXT
VUHYS_EXT
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© 2009 ROHM Co., Ltd. All rights reserved.
2/19
2009.04 - Rev.A
BD9202EFS
Parameter
【LOADSW
section】
LOADSW ON value of resistance
【Filter(CP1,CP2)
section】
CP Detection voltage
CP Charging current
【LED
output (LED1½8) section】
LED Electric current absolute
variation
ISET Clamp voltage
Open detection voltage
Short detection voltage
【
Logic input(EN,CPUCS,CPUCLK,CPUDI)
】
Input High voltage
Input Low voltage
Input influx electric current
(CPUCS,CPUCLK,CPUDI)
Input influx electric current (EN)
【Logic
output section(CPUDO)】
output High voltage
output Low voltage
【FAIL1,2outut
open drain】
FAIL Low voltage
Symbol
Min
1.2
1.8
-2.0
-
1.8
0.05
3.5
0.7×
CPUVDD
Technical Note
Limit
Typ
2.0
2.0
-1.0
-
2.0
0.20
4.0
Max
2.2
2.2
-0.5
(5)
2.2
0.35
4.5
CPUVDD
Unit
kΩ
V
uA
%
V
V
V
Condition
R
ON_LOAD
VCP
ICP
⊿ILED
VISET
VOPEN
VSHORT
ILOAD=1mA
CP1,CP2=Sweep up
CP1,CP2=0V
ILED=75mA,VSET=1.65V
RISET=130kΩ
when input VSET＞VISET
VLED=Sweep down
VLED=Sweep up
VINH
VINL
IIN
IEN
VOUTH
VOUTL
VOL
-
-
0
25
2.7
0.25
0.14
+0.3
0.3×
CPUVDD
V
V
uA
uA
V
V
V
VIN=5V(CPUCS,
CPUCLK,CPUDI),
CPUVDD=5V
VEN=5V(EN)
IOL=-1mA,CPUVDD=3V
IOL=1mA,CPUVDD=3V
IOL=1mA
-0.3
-5
13
2.4
-
0.07
5
38
-
0.6
0.28
＊This
product is not designed for protection against radioactive rays.
●Block
diagram
V
IN
C
IN
CREG
UVLO
34
+
VREG
15
33
LOADSW
COUT
VCC
EN
VREF
RT
14
41
UVLO
EXT
UVLO
VREG
TSD
OVP
FILTER
30
4
VREG
PWM COMP
OSC1
-
+
+
Control
Logic
-
+
OVP
CP1
CP1
FAIL1
SWOUT
6
16
28
Driver
31
29
CS
CT_SYNC_IN
CT_SYNC_OUT
AGND
COMP
R
PC
C
PC
CPUVDD
CPUCS
CPUCLK
CPUDI
CPUDO
TOUT2
37
35
OCP
ERR AMP
8
39
11
13
12
9
10
40
-
-
-
-
-
-
-
-
+
32
PGND1
1
3
20
22
23
25
42
44
I/F
Logic
Current driver
LED1
LED2
LED3
LED4
LED5
LED6
LED7
LED8
VSET
18
ISET
ISET
17
2
21
24
43
PGND2
PGND3
PGND4
PGND5
PWMCLK
BRT
27
OSC2
Open-Short
Detect
FILTER
5
CP2
CP2
FAIL2
Nov.29.2007
BCT_SYNC_IN
38
7
36
BCT_SYNC_OUT
TEST
19
26
TOUT1
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© 2009 ROHM Co., Ltd. All rights reserved.
3/19
2009.04 - Rev.A
BD9202EFS
●Pin
configuration
BCT_SYNC_OUT
CT_SYNC_OUT
Technical Note
BCT_SYNC_IN
CT_SYNC_IN
LOADSW
PGND1
SWOUT
PGND5
TOUT
1
LED8
PGND4
TOUT
2
COMP
UVLO
LED7
LED6
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
BD９２０２EFS
1
LED1
2
PGND2
3
LED2
4
CP1
5
CP2
6
FAIL1
7
FAIL2
8
AGND
9
CPUDI
10
CPUDO
11
CPUVDD
12
CPUCLK
13
CPUCS
14
VCC
15
VREG
16
VREF
17
ISET
18
VSET
19
TEST
20
LED3
21
PGND3
22
LED4
●Terminal
number， terminal name
PIN
No.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
Terminal
name
LED1
PGND2
LED2
CP1
CP2
FAIL1
FAIL2
AGND
CPUDI
CPUDO
CPUVDD
CPUCLK
CPUCS
VCC
VREG
VREF
ISET
VSET
TEST
LED3
PGND3
LED4
Function
LED output terminal1
GND2 for LED
LED output terminal2
Condenser connected terminal for filter
setting 1
Condenser connected terminal for filter
setting 2
Malfunction detection output 1
Malfunction detection output 2
Small signal section GND
Serial interface DATA input terminal
Serial interface DATA output terminal
Serial interface
Power supply
terminal
Serial interface CLK input terminal
Serial interface CS input terminal
PIN
No.
(23)
(24)
(25)
(26)
(27)
(28)
(29)
(30)
(31)
(32)
(33)
(34)
(35)
(36)
(37)
(38)
(39)
(40)
(41)
(42)
(43)
(44)
Terminal name
LED5
PGND4
LED6
TOUT1
BRT
RT
CS
OVP
SWOUT
PGND1
LOADSW
UVLO
CT_SYNC_OUT
BCT_SYNC_OUT
CT_SYNC_IN
BCT_SYNC_IN
COMP
TOUT2
EN
LED7
PGND5
LED8
Function
LED output terminal 5
GND4 for LED
LED output terminal 6
Output terminal 1 for test monitor 1
BCT oscillation frequency setting
resistant connected terminal
CT oscillation frequency setting
resistant connected terminal
DC/DC output
electric current
detection terminal
DC/DC
Over-voltage
detection
terminal
DC/DC Switching output terminal
GND1 for LED
Load switch control terminal
It is the prevention detection terminal
for miss operating at low voltage
CT Synchronization signal output
terminal
BCT Synchronization signal output
terminal
CT Synchronization signal input
terminal
BCT Synchronization signal input
terminal
Error amplifier output terminal
Output terminal 2 for test monitor
Enabling terminal
LED output terminal 7
GND5 for LED
LED output terminal 8
Power supply
terminal
Series regulator output terminal
Reference voltage output terminal
LED fixed electric current setting resistant
connected terminal
DC modulated light voltage input terminal
Test mode change terminal
Output terminal 3
GND3 for LED
LED output terminal 4
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© 2009 ROHM Co., Ltd. All rights reserved.
4/19
2009.04 - Rev.A
LED5
OVP
EN
CS
RT
BRT
BD9202EFS
●The
reference data (Unless otherwise specified VCC=24V and Ta=25
℃)
5.5
Technical Note
110
VCC=24V, Io=0mA
VCC=24V, Io=0mA
700
OSC1,OSC2 FREQUENCY [kHz]
5.3
680
660
640
620
600
580
560
540
520
500
-40
-15
10
35
60
85
100
5.1
EFFICIENCY [%]
VREG [ V ]
90
4.9
80
VCC=24V, RT(BRT)=51kΩ
4.7
4.5
-40
-15
10
35
60
85
70
60
0
200
400
600
800
1000
1200
Ta [℃]
Fig.1 VREG Temperature characteristic
100
IDCDC [mA]
Fig.2 VREF Temperature characteristic
90
Ta [℃]
Fig.3
OSC1,OSC2 Temperature
re characteristic
1.0
0.9
80
85
VCC=24V, RSET=68kΩ
ILED [ mA ]
VFB [ V ]
VCC=24V, RSET=68kΩ
ILED [ mA ]
60
VCC=24V, RSET=130kΩ
80
0.8
0.7
0.6
0.5
40
20
75
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
70
-40
-15
10
35
60
85
VLED [V]
Fig.4 ILED depending on VLED
-40
-15
10
35
60
85
Ta [℃]
Fig.5 ILED Temperature characteristic
Ta [℃]
Fig.6 VSET
Constant
electric current
characteristic
1.0
100
10
0.9
VCC=24V
80
8
ILED [ mA ]
VFB [ V ]
VREG [ V ]
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0.8
60
40
20
6
0.7
4
0.6
0
2
0.5
-40
-15
10
35
60
85
VLED [V]
Fig.8 ICC-VCC characteristic
0
0
1
2
3
4
5
Ta [℃]
Fig.7 VLED
characteristic
5.0
Temperature
VEN [V]
Fig.9 EN Threshold voltage
1.0
110
100
0.9
4.0
VFB [ V ]
0.8
EFFICIENCY [%]
4.5
V
SHORT
[ V ]
90
80
70
60
VCC=24V, recommendation
ex
ternal part use
for
0.7
3.5
0.6
3.0
-40
-15
10
35
60
85
0.5
Ta [℃]
-40
-15
10
35
60
85
0
200
400
600
800
1000
1200
Ta [℃]
Fig.11
Open
detection temperature
characteristic
IDCDC [mA]
Fig.10
Short detection temperature
characteristic
Fig.12 Efficiency
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© 2009 ROHM Co., Ltd. All rights reserved.
5/19
2009.04 - Rev.A
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