bd9202efs ROHM Co. Ltd., bd9202efs Datasheet - Page 2

• Manufacturer Part Number: bd9202efs
• Description: White Backlight Led Drivers For Medium To Large Lcd Panels Swreg Type
• Manufacturer: ROHM Co. Ltd.

●Operating condition (Ta=25℃)
●
（(Unless otherwise specified Ta=25℃，VCC=24V，VREG=5V, CPUVDD=3V）
【All the circuit electric currents】
Circuit electric currents
Stand-by electric current
【VREG section】
VREG Output voltage
VREG VREG sink electric current
VREF Output voltage
【Switching section】
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
© 2009 ROHM Co., Ltd. All rights reserved.
BD9202EFS
www.rohm.com
Electric characteristic
*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.
Parameter
BCT_SYNC_IN input frequency range *4*5
CT_SYNC_IN input frequency range *4*5
BCT oscillation frequency setting range
CT oscillation frequency setting range
Power supply voltage
VSET Input potential
Parameter
ICOMPSOURCE
VBSYNC_OUTH
VBSYNC_OUTL
VSYNC_OUTH
VUVLO_VREG
VUHYS_VREG
ICOMPSINK
VSYNC_OUTL
VBSYNC_INH
VBSYNC_INL
VUHYS_EXT
VUVLO_EXT
VSYNC_INH
VSYNC_INL
VOVPHYS
VOLIMIT
Symbol
VREG
RONH
RONL
VREF
VLED
IREG
VOVP
FBCT
FCT
IST
Icc
VREG
VREG
VREG
VREG
1.57
0.55
-200
×0.7
×0.7
Min
1.85
4.8
0.1
500
-0.3
-1.0
500
-0.3
-1.0
40
0.4
2.6
1.7
6
50
50
5
-
-
-
-
-
2/19
FCT_SYNC_IN
FBCT_SYNC_I
CPUVDD
Symbol
VREG
VSET
fBCT
fCT
VREG
VREG
Limit
–0.15
–0.15
1.60
0.75
-100
100
Typ
0.2
600
600
100
100
13
12
0.1
0.1
2.0
0.5
2.9
1.9
0
5
7
2
-
-
-
-
VREG
VREG
VREG
VREG
Max
×0.3
×0.3
1.63
0.95
+0.3
+0.3
2.15
200
700
700
200
200
-40
5.2
0.3
0.5
0.5
0.6
3.2
2.1
21
10
20
-
-
-
-
Voltage range
fBCT～1000
100～1000
5.25～5.5
300～800
fCT～800
2.7～5.5
0.9～2.4
Unit
kHz
kHz
mA
mA
mV
mV
uA
uA
uA
Ω
Ω
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
VCC=24V
CPUVDD=3V, EN=3V
LED1～8=OFF
EN=0V
Io=0mA,CREG=2.2uF
At the time of external impressing of
VREG=5.25VAt
LED1～8=OFF,EN=3V
Io=0uA
ION=-10mA
ION=10mA
Vcs=Sweep up
VLED=2V,Vcomp=1V
VLED=0V,Vcomp=1V
RT=51kΩ
IOL=-1mA
IOL=1mA
BRT=51kΩ
IOL=-1mA
IOL=1mA
VOVP=Sweep up
VOVP=Sweep down
VREG=Sweep down
VREG=Sweep up
UVLO=sweep down
UVLO=sweep up
Unit
kHz
kHz
kHz
kHz
V
V
V
Condition
Technical Note
2009.04 - Rev.A