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PDF BD9202EFS Data sheet ( Hoja de datos )
| Número de pieza | BD9202EFS | |
| Descripción | White backlight LED drivers | |
| Fabricantes | ROHM Semiconductor | |
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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
Symbol
Rating
Unit
Power supply voltage
LED1～8 terminal voltage
VCC
CPUVDD
VREG
VLED1～8
36 V
5.5 V
5.5 V
60 V
EN,LOADSW terminal voltage
VEN,VLOADSW
36 V
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
VFAIL1,VFAIL2
VVREF, VISET, VVSET, VTEST, VBRT,
VRT, VCS, VUVLO,
VCOMP,VCP1,VCP2,VTOUT1,
VTOUT2,VSWOUT,VOVPVCT_SYNC_IN,
VCT_SYNC_OUT,VBCT_SYNC_IN,
VBCT_SYNC_OUT
VCPUDI, VCPUCLK, VCPUCS, VCPUDO
7
-0.3～5.5＜
VREG
-0.3～5.5＜
CPUVDD
V
V
V
Power Dissipation
www.DataSheet4U.cOopmerating Temperature Range
Storage Temperature Range
Pd
4.5 *1
W
Topr
-40～+85
℃
Tstg
-55～+150
℃
LED Maximum Current
ILED
150 *2 *3
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.
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/19
2009.04 - Rev.A
1 page  
BD9202EFS
●The reference data (Unless otherwise specified VCC=24V and Ta=25 ℃)
5.5
VCC=24V, Io=0mA
5.3
5.1
4.9
4.7
4.5
-40 -15
10
35
60
85
Ta [℃]
Fig.1 VREG Temperature characteristic
100
80
60 VCC=24V, RSET=68kΩ
40
20
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
VLED [V]
Fig.4 ILED depending on VLED
1.0
0.9
VCC=24V
0.8
0.7
0.6
0.5
-40
-15 10
35
Ta [℃]
Fig.7 VLED
characteristic
60 85
Temperature
5.0
4.5
4.0
3.5
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3.0
-40 -15
10
35
60
85
Ta [℃]
Fig.10 Short detection temperature
characteristic
110
VCC=24V, Io=0mA
100
90
80
70
60
0 200 400 600 800 1000 1200
IDCDC [mA]
Fig.2 VREF Temperature characteristic
90
85
VCC=24V, RSET=130kΩ
80
75
70
-40 -15 10 35 60
Ta [℃]
85
Fig.5 ILED Temperature characteristic
100
80
60
40
20
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
VLED [V]
Fig.8 ICC-VCC characteristic
1.0
0.9
0.8
0.7
0.6
0.5
-40 -15
10
35
60
85
Ta [℃]
Fig.11 Open detection temperature
characteristic
Technical Note
700
680
660
640
620
600
580
560
540
520
500
-40
Fig.3
VCC=24V, RT(BRT)=51kΩ
-15 10 35 60 85
Ta [℃]
OSC1,OSC2 Temperature
re characteristic
1.0
0.9
VCC=24V, RSET=68kΩ
0.8
0.7
0.6
0.5
-40 -15
10
35
60
85
Ta [℃]
Fig.6 VSET Constant electric current
characteristic
10
8
6
4
2
0
012345
VEN [V]
Fig.9 EN Threshold voltage
110
100
90
80
70
60
0
VCC=24V, recommendation for
external part use
200 400 600 800 1000 1200
IDCDC [mA]
Fig.12 Efficiency
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
5/19
2009.04 - Rev.A
5 Page 
BD9202EFS
Technical Note
○Booster DC/DC Controller
・ LED Series Numeric
It detects the LED cathode voltage, or the LED voltage, and controls the output voltage to be 0.75 (Typ.). The booster only
operates when the LED output is operating. When multiple LED outputs are operating, the LED VF controls the LED output
of the highest line to be 0.75V (Typ.). Therefore, the voltages of other LED outputs are higher by the variation of VF.
Furthermore, you must be aware that the LED inline numerics have the following limits. At open detection, 85% of
the OVP configured voltage becomes the trigger, so the maximum value of output voltage during normal operation is
51V=60×0.85, and 51V/VF>maximum N.
・ Over voltage Protection Circuit OVP
Inputs the output voltage to the OVP terminal with resistive divide. The configured value of OVP should be
determined by the series numeric of the LED and the VF variance. When determining the OVP configured voltage,
the open detection trigger, OVP×0.85 should be considered. The switching operation stops when OVP is detected.
Furthermore, if the output voltage falls to 80% of the OVP configuration voltage within the filter time tcp1 determined
by CP1, OVP is released. If OVP continues for over tcp1, the error detection flag FAIL1 turns to Low, it latches with
the switching operation in the stopped position.
When the output voltage side is ROVP1 and the GND side is ROVP2, the OVP detection voltage is:
VOVP=(ROVP1+ROVP2)/ROVP2×2.0V
When ROVP1=560kΩand ROVP2=20kΩ, OVP activates when VOUT=58V or more.
・ Booster DC/DC Converter Oscillation Frequency and LED Driver PWM Standard Frequency
By attaching resistance to RT (BRT), it is possible to configure triangular wave oscillation frequency. The RT (BRT)
determines the charge and discharge current corresponding to the internal condenser, and the frequency changes.
Configure the RT (BRT) resistance by referring to the theoretical formula below. We recommend a range of 30kΩ
~300kΩ. Configurations outside of the frequency range in the chart below can result in stopping switching, and
operation cannot be guaranteed.
RTR(BTR( BT)R-FTO) -SFCOCShCa特rac性teristics
1200
1000
800
Calculated
6 00 (A計(c実tVu算aa線llu値Le）ine)
4 00 実M測ea値sured
( マ ーVカaーlue）
(Marker)
200
fosc
3.04 104
RT (BRT )[kΩ]
[kHz]
0
0 100 200 300 400 500 600
RT(BRT)[kΩ]
・ Internal Oscillation Frequency Output Terminal CT_SYNC_OUT and External Synchronous Terminal CT_SYNC_IN
The internal oscillation frequency output terminal CT_SYNC_ OUT outputs the internal oscillator’s clock configured by the
RT terminal. However, there is no output when there is a CLK input in the external synchronous terminal CT_SYNC_IN.
The external synchronous terminal CT_SYNC_IN can be the operational frequency of the DC/DC converter by
externally inputting CLK. At this time, the external input frequency should be configured to be higher than the internal
oscillation frequency. Furthermore, there should be no switching between the external synchronous and internal oscillator
during operation.
・ Soft Start
There is no soft start function with this IC. At startup, stand-up occurs with control by the current value configured by
OCP (over-current detection).
・ Over-current Protection Circuit (OCP)
The current flowing through the coil is changed to voltage by the sense resistance Rcs, and when the CS terminal is
over 0.2V (typ), the switching operation is stopped.
OCP detection is in pulse-by-pulse format, and is detected at every switching cycle and reset at the next clock.
When detection continues longer than the time configured at tCP1, FAIL1=L and it latches with the switching operation
www.DataShieneth4eU.sctoompped position.
○ Error Detection Output Function
・ Outputs errors detected by protection circuits to FAIL1 and FAIL2 terminals. FAIL1 or FAIL2 switch to Low after the
filter time configured at CP1 or CP2, when they detect OVP or OCP (FAIL1) or LED open/short (FAIL2). (Because
FAIL1 terminal is open collector output, it is used with external pull-up.)
The filter time for CP1 and CP2 is expressed as:
Tcp1(cp2)
Ccp1 2V
1μA
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
11/19
2009.04 - Rev.A
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet BD9202EFS.PDF ] | |
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