BD9421F_15 Datasheet, PDF (2/31 Pages) Rohm – White LED Driver for large LCD Panels (DCDC Converter Type)

BD9421F
Datasheet
Absolute Maximum Ratings(Ta = 25°C)
Parameter
Symbol
Rating
Unit
Supply Voltage
VCC
-0.3 to +36
V
STB,OVP Voltage
STB,OVP
-0.3 to +36
V
BS1-6 Voltage
BS1-6
-0.3 to +60
V
CS,CL1-6,FB,RT Voltage
CS,CL1-6,FB,RT
-0.3 to +7
V
REG75,N Voltage
REG75,N
-0.3 to +14
V
PWM,VREF Voltage
Power Dissipation for SOP24
PWM,VREF
Pd
-0.3 to +20
V
0.68 ^{(Note 1)}
W
Operating Temperature Range
Topr
-40 to +85
°C
Storage Temperature Range
Tstg
-55 to +150
°C
Maximum Junction Temperature
Tjmax
150
°C
(Note 1) Derating in done 5.5mW/°C for operating above Ta≧25°C (Mount on 1-layer 70.0mm x 70.0mm x 1.6mm board)
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over
the absolute maximum ratings.
Recommended Operating Conditions(Ta= -40°C to +85°C)
Parameter
Symbol Min
Typ
Max Unit
Supply Voltage
VCC
9
24
35
V
DC/DC Oscillation Frequency
FSW
100
-
800
kHz
Analog Dimming Setting Input Range VREF
0.6
0.9
3.0
V
External Component Recommended Range
Parameter
Symbol
Specification
Unit
VCC pin connecting capacity
CVCC
1 to 100
uF
REG75 pin connecting capacity
C_REG
1.0 to 10
uF
RT pin connection resistance range
RRT
18.75 to 150
kΩ
The operating conditions listed above are constants for the IC alone. To make constant setting with practical set devices, utmost attention should be paid.
Pin Configuration
(TOP VIEW)
Marking Diagram and Physical Dimension
SOP24
Figure 3. Pin Configuration
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TSZ22111 • 15 • 001
BD9421F
1PIN MARK
LOT No.
2/27
Figure 4. Physical Dimension
TSZ02201-0F1F0C100310-1-2
25.Sep.2015 Rev.003