BD9470AEFV Datasheet, PDF (4/39 Pages) Rohm – White LED driver for medium sized and large sized LCD back light

BD9470AFM・BD9470AEFV
●Electrical Characteristics (unless otherwise specified, Ta = 25°C, VCC=24V )
Parameter
Symbol
Specification
unit
Min
Typ
Max
【Whole Device】
Condition
Operation Circuit
Icc
－
5.5
8.5
mA STB=3V, PWM1-6=3.3V
Standby current
IST
－
40
80
μA STB=0V
【UVLO Block】
Operating voltage (VCC）
VUVLO_VCC
6.5
7.5
8.5
V VCC=SWEEP UP
Hysteresis voltage （VCC）
VUHYS_VCC
150
300
600
mV VCC=SWEEP DOWN
UVLO release voltage
VUVLO_U
2.88
3.00
3.12
V VUVLO=SWEEP UP
UVLO hysteresis voltage
VUHYS_U
250
300
350
mV VUVLO=SWEEP DOWN
UVLO pin leakage current
UVLO_LK
-2
0
2
μA VUVLO=4V
【DC/DC Block】
Error amp. Reference
(Min)
Error amp. basic
(ILED=130mA)
voltage
voltage
Oscillation frequency
VLED
VLED
FCT
0.36
0.428
142.5
0.40
0.450
150
0.44
0.472
157. 5
V
LEDx Terminal ILEDx =
40mA
V
LEDx Terminal ILEDx =
130mA
KHz RT=100kohm
Max. duty cycle of output N
NMAX_DUTY
90
95
99
% RT=100kohm
RT short protection range
On resistance on N pin source
side
On resistance on N pin sink side
RT_DET
RONSO
RONSI
-0.3
-
VRT×90% V RT=SWEEP DOWN
1.5
3
6
Ω
1.5
3
6
Ω
RT pin voltage
VRT
1
1.5
2
V RT=100kohm
SS pin source current
ISSSO
-2.6
-2.0
-1.4
μA VSS=2V
Soft start completion voltage
VSS_END
3.52
3.70
3.88
V SS=SWEEP UP
FB source current
FB sink current
FB source mode
SS pin input voltage range
FB sink/source mode
SS pin input voltage range
Over current detect voltage
IFBSO
IFBSI
FB_SO_SS
FB_SOSI_SS
VCS
-115
70
4.9
3.9
372
-100
100
-
-
400
-85
μA VLED=0V, VFB=1.0V
130
μA
VLED=5.0V(ALL_CH),
VFB=1.0V,VSS=4V
-
V SS=SWEEP UP
4.4
V SS=SWEEP DOWN
428
mV CS=SWEEP UP
CS source current
ICS
15
30
60
μA VCS=0V
【DC/DC protection Block】
OVP Detect Voltage (DCDC
Stop)
OVP protection timer release
VOVP
VOVP_CAN
2.90
3.00
3.10
V
VOVP-0.14 VOVP-0.1 VOVP-0.04 V
VOVP SWEEP UP
VOVP SWEEP DOWN
Short protection detect voltage
VSCP
0.05
0.1
0.15
V VOVP SWEEP DOWN
OVP pin leakage current
OVP_LK
-2
0
2
μA VOVP=4V
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TSZ22111・15・001
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TSZ02201-0F10C1002000-1-2
19.Oct.2013 Rev.003