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Rohm Semiconductor Electronic Components Datasheet

BD9422EFV Datasheet

White LED Driver

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Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD
panel
BD9422EFV
General Description
BD9422EFV is a high efficiency driver for white LEDs
and designed for large LCD panel. This IC is built-in
high current drive and high responsibility type 6ch LED
drivers and 1ch boost DCDC converter. BD9422EFV
has some protect function against fault conditions,
such as the over-voltage protection (OVP), LED OPEN
and SHORT protection, the over current limit
protection of DCDC (OCP). Therefore BD9422EFV is
available for the fail-safe design over a wide range
output voltage.
Key Specification
Operating power supply voltage range: 9.0V to 35.0V
Oscillator frequency:
500kHz (RT=30k)
Operating Current:
9mA (typ.)
Operating temperature range:
-40°C to +85°C
Applications
TV, Computer Display, Notebook, LCD Backlighting
Typical Application Circuit
Features
6ch Constant LED drivers, available 400mA drive
per 1ch.
Constant current accuracy ±1.8% (IC only)
Each 6ch external PWM inputs can control independent
dimming .
Current analog (linear) dimming by VREF
1ch boost controller with current mode (external FET)
Several protection functions
DCDC part
: OCP/OVP/UVLO/TSD
LED driver part :OPEN,SHORT detection
SHORT detection voltage is set by LSP terminal.
Error detection output FAIL terminal inside
(normal=Open, error=Drain)
Master/Slave mode inside
Package
HTSSOP-B40
Pin Pitch:
W(Typ.) D(Typ.) H(Max.)
13.60mm x 7.80mm x 1.00mm
0.65mm
Figure 1. Typical Application Circuit
Figure 2. HTSSOP-B40
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product is not designed protection against radioactive rays
1/26
TSZ02201-0F1F0C100210-1-2
1.Sep.2015 Rev.006


Rohm Semiconductor Electronic Components Datasheet

BD9422EFV Datasheet

White LED Driver

No Preview Available !

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
4.7 *1
W
Thermal resistance between junction and case
θjc
7 *2 °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
Symbol
Setting Range
Unit
VCC terminal connection capacitance
Soft-start set capacitance
CVCC
SS
1.0 to 10
0.001 to 1.0
μF
μF
Timer latch set capacitance
CP
0.001 to 2.7
μF
Operating frequency set resistance
RT
12 to 150
k
REG9V terminal connection capacitance
CREG9V
2.2 to 10
μF
The values described above are constants for a single IC. Adequate attention must be paid to setting of a constant for an actual set of parts
Pin Configuration
Physical Dimension Tape and Marking Diagram
1 VCC
2 FAIL
3 REG9V
4 N.C.
5N
6 PGND
7 CS
8 OVP
9 M_DET
10 SUMPWM
11 LED1
12 LED2
13 LED3
14 LED4
15 LED5
16 LED6
17 STB
18 PWM1
19 PWM2
20 PWM3
AGND 40
UVLO 39
FAIL_MODE 38
LSP 37
LED_LV 36
VREF 35
RT 34
FB 33
SS 32
CP 31
S1 30
S2 29
S3 28
S4 27
S5 26
S6 25
FAIL_RST 24
PWM6 23
PWM5 22
PWM4 21
Figure 3.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
BD9422EFV
LOT No.
Figure 4. HTSSOP-B40
2/26
TSZ02201-0F1F0C100210-1-2
1.Sep.2015 Rev.006


Part Number BD9422EFV
Description White LED Driver
Maker ROHM
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