BD9420F Datasheet, PDF (3/31 Pages) Rohm – White LED Driver for large LCD Panels (DCDC Converter Type)

BD9420F
Datasheet
Electrical Characteristics(Unless otherwise specified VCC=24V Ta=25°C)
Parameter
Symbol
Min.
Limit
Typ.
Max.
[Whole Device]
Operation Current
Standby Current
[UVLO Block]
ICC
－
5
10
IST
－
40
80
Operation Voltage （VCC）
Hysteresis Voltage （VCC）
[DC/DC Block]
VUVLO_VCC
6.5
7.5
8.5
VUHYS_VCC
150
300
600
Unit
Condition
mA VSTB=3V
uA VSTB=0V
V VCC=SWEEP UP
mV VCC=SWEEP DOWN
Error amp Base Voltage
Oscillation Frequency
N Pin MAX DUTY Output
N Pin Source ON Resistance
N Pin Sink ON Resistance
RT Pin Voltage
RT Short Protection Range
RT Pin Low Resistance
FB Pin Source Current
FB Pin Sink Current
Over Current Detect Voltage
CS Source Current
[DC/DC Protection Block]
VEAMP
FCT
NMAX_DUTY
RNSO
RNSI
VRT
RT_DET
RRT_L
IFBSO
IFBSI
VCS
ICS
0.55
142.5
90
2.5
2
1.60
-0.3
-
-115
85
0.35
15
0.60
150.0
95
5
4
2.00
-
2.0
-100
100
0.40
30
0.65
157.5
99
10
8
2.40
V BSx pin, VREF=0.9V
kHz RT=100kΩ
% RT=100kΩ
Ω
Ω
V RT=100kΩ
VRTx90% V RT=SWEEP DOWN
4.0
kΩ VSTB=0V
VBSx=0V, VREF=0.9V,
-85
uA VFB=1.0V
VBSx=2.0V, VREF=0.9V,
115
uA VFB=1.0V
0.45
V CS=SWEEP UP
60
uA VCS=0V
OVP High Detect Voltage
VOVPH
2.88
3.00
3.12
V VOVP SWEEP UP
OVP Hysteresis Voltage
VOVPH_HYS
150
200
250
V VOVP SWEEP DOWN
Short Protection Detect Voltage
VSCP
0.05
0.10
0.15
V VOVP SWEEP DOWN
OVP Pin Leakage Current
[LED PNP Driver Block]
OVP_LK
-2
0
2
uA VOVP=4V
CL Pin Current Setting Voltage
CL Pin Current Setting Voltage
(Analog MAX)
CL Pin Current Setting Voltage
(Analog MIN)
PNP Driver Output Sink
Resistance
VREF Pin Leakage Current
VCL
VCLMAX
VCLMIN
RBS
VREF_LK
294.0
-3%
-3%
55
-2
300.0
1.0
200.0
80
0
306.0
+3%
+3%
120
2
mV VREF=0.9V
V VREF max=3.0V
mV VREF min=0.6V
Ω PWM=High, VCL=Low
uA VREF=1V
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TSZ02201-0F1F0C100300-1-2
31.Jan.2014 Rev.002