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Rohm Semiconductor Electronic Components Datasheet

BD9423EFV Datasheet

6ch boost LED driver

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Datasheet
LED Drivers for LCD Backlights
6ch boost LED driver which constant setting
can be shared by I2C control
BD9423EFV
1.1 General Description
BD9423EFV 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. BD9423EFV 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 BD9423EFV is available for the
fail-safe design over a wide range output voltage.
Moreover the functions and the detection voltage can be
controlled by the I2C. This enables for the constant
setting of external parts to be shared by I2C control,
nevertheless the different usage condition.
Features
Operating power supply voltage range:9.0V to 35.0V
Oscillator frequency:
200kHz (RT=100k)
Operating Current:
9mA (typ.)
Operating temperature range:
-40°C to +85°C
Key Specifications
LED drivers Max curret
400mA per channel
Constant current accuracy
±1.8% (IC only)
Current analog (linear) dimming by ADIM pin
Several protection functions
DCDC part
: OCP/OVP/UVLO
LED driver part :OPEN,SHORT detection
SHORT detection voltage is set by LSP pin
Error detection output by FAIL pin
Master/Slave mode inside
1.2 Package
HTSSOP-B40:
Pin Pitch:
W(Typ) x D(Typ) x H(Max)
13.60mm x 7.80mm x 1.00mm
0.65mm
Applications
TV, Computer Display, Notebook, LCD Backlighting
Typical Application Circuit
Figure 1. HTSSOP-B40
Figure 2. Typical application circuit
Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
This product has no designed protection against radioactive rays
1/57
TSZ02201-0F2F0C100080-1-2
9.Oct.2015 Rev.001


Rohm Semiconductor Electronic Components Datasheet

BD9423EFV Datasheet

6ch boost LED driver

No Preview Available !

BD9423EFV
1.3 Pin Configuration
Datasheet
Figure 3. Pin Configuration
1.4 Pin Descriptions
No. Name
1 VCC
2 FAIL
Function
Power supply pin
Abnormality detection output pin
3 REG9V 9.0V regulator output pin
4
N.C.
-
5 N DC/DC switching output pin
6
PGND
Power GND pin
7 CS DC/DC FET current detection pin
8
OVP
OVP detection pin
9 FAIL_MODE FAIL function selection pin
10
AGND
GND pin for analog part
11
LED1
LED output 1
12
LED2
LED output 2
13
LED3
LED output 3
14
LED4
LED output 4
15
LED5
LED output 5
16
LED6
LED output 6
17
STB
ON/OFF pin
18
DVDD
Power supply pin for I2C part
and register
19
SDA
I2C data pin
20 SCL I2C Clock pin
No.
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
Name
AGND
UVLO
LSP
LED_LV
ADIM_P
ADIM
RT
FB
SS
CP
S1
S2
S3
S4
S5
S6
FAIL_RST
SUMPWM
DGND
PWM
Function
GND pin for analog part
Low voltage malfunction
detection pin
LED SHORT detection voltage
setting pin
LED feedback voltage setting
pin
Pulse analog dimming signal
input pin
Analog dimming DC voltage I/O
pin
Connecting pin for DC/DC
frequency setting resistor
Error AMP output pin
Connecting pin for soft start
setting capacitor
Connecting pin for abnormality
detection setting capacitor
Connecting pin for LED1 constant
current setting resistor
Connecting pin for LED2 constant
current setting resistor
Connecting pin for LED3 constant
current setting resistor
Connecting pin for LED4 constant
current setting resistor
Connecting pin for LED5 constant
current setting resistor
Connecting pin for LED6 constant
current setting resistor
FAIL output reset pin
Master/Slave setting input/output
pin
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
2/57
TSZ02201-0F2F0C100080-1-2
9.Oct.2015 Rev.001


Part Number BD9423EFV
Description 6ch boost LED driver
Maker ROHM
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BD9423EFV Datasheet PDF






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