Datasheet > BD9285F

BD9285F

更新时间： 2024-11-29 12:50:43

品牌	Logo	应用领域
罗姆 - ROHM		驱动器显示器
页数	文件大小	规格书
39页	1108K
描述
Boost 1channel white LED driver For large LCDs

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BD9285F 数据手册

BD9285F

Datasheet

Boost 1channel white LED driver

For large LCDs

BD9285F

●General Description

●Key Specifications

¢ Input voltage range:

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.

9.0V to 18.0V

¢ DCDC oscillation frequency: 150kHz (RT=100kΩ)

¢ Active current consumption:

¢ Operating temperature range:

1.2mA(Typ.)

-40℃ to +85℃

●Package(s)

W(Typ.) x D(Typ.) x H(Max.)

11.20mm x 7.80mm x 2.01mm

Pin pitch 1.27mm

SOP18

●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

Figure 1. SOP18

¢ The UVLO detection for the input voltage of the power

stage

¢ FAIL logic output

●Applications

¢ TV, PC display and other LCD backlight system.

●Typical Application Circuit(s)

VCC

VIN

VCC

UVLO

OVP

TC54

STB

GATE

Css

FAILB

PWM1

PWM2

DIMOUT

ISENSE

ADIM_P

ADIM

GND

Figure 2. Typical application circuit

○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays

.www.rohm.com

TSZ02201-0F1F0C100030-1-2

11.Jul.2012 Rev.001

1/36

TSZ22111・14・001

12 3 4 5 6 7...39

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