BD9285F Datasheet, PDF (1/39 Pages) Rohm – Boost 1channel white LED driver For large LCDs

BD9285F
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:
-40℃ to +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 structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays
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TSZ02201-0F1F0C100030-1-2
11.Jul.2012 Rev.001