BD9422EFV Datasheet, PDF (2/28 Pages) Rohm – White LED Driver for large LCD panel

BD9422EFV
Datasheet
●Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
Ratings
Unit
Operating Temperature Range
Ta(opr)
-40 to +85
°C
Storage Temperature Range
Tstg
-55 to +150
°C
Power Dissipation
Pd
Thermal resistance between junction and case
θjc
4.7 *1
7 *2
W
°C/W
Maximum Junction Temperature
Tjmax
150
°C
Maximum LED output current
ILED
400 *3 *4
mA
*1 In the case of mounting 4 layer glass epoxy base-plate of 70mm×70mm×1.6mm, 37.6mW is reduced at 1°C above Ta=25℃.
*2 In the case of mounting 4 layer glass epoxy base-plate of 70mm×70mm×1.6mm.
*3 Wide VF variation of LED increases loss at the driver, which results in rise in package temperature. Therefore, the board needs to be designed
with attention paid to heat radiation.
*4 This current value is per 1ch. It needs be used within a range not exceeding Pd.
●Operating Ratings (Ta = 25°C)
Parameter
Symbol
Range
Unit
Power supply voltage
VCC
9 to 35
V
DC/DC oscillation frequency
FCT
100 to 1250 *5
kHz
VREF input voltage
VREF
0.2 to 2.5
V
LSP terminal input voltage
VLSP
0.8 to 3
V
FB terminal output voltage
VFB
0 to 3.3
V
M_DET terminal output voltage
VM_DET
0 to REG9V
V
The operating conditions written above are constants of the IC unit. Be careful enough when setting the constant in the actual set.
●External Components Recommended Range
Item
VCC terminal connection capacitance
Soft-start set capacitance
Timer latch set capacitance
Operating frequency set resistance
REG9V terminal connection capacitance
The values described above are constants for a single IC.
Symbol
Setting Range
Unit
CVCC
1.0 to 10
μF
SS
0.001 to 1.0
μF
CP
0.001 to 2.7
μF
RT
12 to 150
kΩ
CREG9V
2.2 to 10
μF
Adequate attention must be paid to setting of a constant for an actual set of parts
●Pin Configuration
●Physical Dimension Tape and Marking Diagram
Figure 3.
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TSZ22111・15・001
BD9422EFV
LOT No.
Figure 4. HTSSOP-B40
2/25
TSZ02201-0F1F0C100210-1-2
31.May.2013 Rev.003