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ROHM Semiconductor - Boost 1channel white LED driver

Numéro de référence BD9285F
Description Boost 1channel white LED driver
Fabricant ROHM Semiconductor 
Logo ROHM Semiconductor 





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BD9285F fiche technique
Datasheet
Boost 1channel white LED driver
For large LCDs
BD9285F
General Description
BD9285F is a high efficiency driver for white LEDs and
designed for large LCDs. This IC is built-in a boost
DCDC converters that employ an array of LEDs as the
light source. BD9285F has some protect function against
fault conditions, such as the over-voltage protection
(OVP), the over current limit protection of DCDC (OCP),
LED over current protection (LEDOCP), the open
detection of LED string. Therefore BD9285F is available
for the fail-safe design over a wide range output voltage.
Features
Current mode DCDC converter
Vout discharge circuit as shutdown
LED protection circuit (OPEN protection, LED OCP
protection)
LED protect detection as small PWM dimming signal
Over-voltage protection (OVP) and low-voltage
protection (SCP: short circuit protection) for the output
voltage Vout
Adjustable soft start time constant
The wide range of analog dimming 0.2V-3.5V
The built-in transformation circuit from pulse to DC
2 PWM dimming signal
The UVLO detection for the input voltage of the power
stage
FAIL logic output
Applications
TV, PC display and other LCD backlight system.
Key Specifications
Input voltage range:
9.0V to 18.0V
DCDC oscillation frequency: 150kHz (RT=100kΩ)
Active current consumption:
1.2mA(Typ.)
Operating temperature range:
-40to +85
Package(s)
SOP18
W(Typ.) x D(Typ.) x H(Max.)
11.20mm x 7.80mm x 2.01mm
Pin pitch 1.27mm
Figure 1. SOP18
Typical Application Circuit(s)
VCC
VIN
VCC
TC54
UVLO
OVP
STB
RT
Css
SS
GATE
CS
FAILB
PWM1
DIMOUT
PWM2
ADIM_P
ADIM
GND
ISENSE
FB
Figure 2. Typical application circuit
Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays
.www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
1/36
TSZ02201-0F1F0C100030-1-2
11.Jul.2012 Rev.001

PagesPages 30
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