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AiT Semiconductor - WHITE LED BACKLIGHT DRIVER SIX-STRING

Numéro de référence A8600
Description WHITE LED BACKLIGHT DRIVER SIX-STRING
Fabricant AiT Semiconductor 
Logo AiT Semiconductor 





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A8600 fiche technique
AiT Semiconductor Inc.
www.ait-ic.com
 
A8600
WHITE LED BACKLIGHT DRIVER
SIX-STRING WITH ACTIVE CURRENT
 
DESCRIPTION
The A8600 is a high-efficiency driver for white
light-emitting diodes (LED(s)). It is designed for large
liquid-crystal displays (LCD(s)) that employ an array of
LED(s) as the light source. A current-mode step-up
controller drives up to six parallel strings of multiple
series-connected LED(s). Each string is terminated with
ballast that achieves ±1.5% current regulation accuracy,
ensuring even bright-ness for all LED(s).
The A8600 has a wide input-voltage range from 4.5V to
26V, and provides a fixed 20mA or adjustable 15mA to
25mA full-scale LED current. The A8600 has two
dimming control modes to enable a wide variety of
applications. In direct DPWM mode, the LED current is
directly turned on and off by a PWM signal. In analog
dimming mode, an internal phase-locked loop (PLL)
circuit translates the PWM signal into an analog signal
and linearly controls the LED current down to 12.5%.
Below 12.5%, digital dimming is added to allow lower
average LED current down to 1%. Both control methods
provide 100:1 dimming range. The A8600 has multiple
features to protect the controller from fault conditions.
Separate feedback loops limit the output voltage if one
or more LED(s) fail open or short. The controller features
cycle-by cycle current limit to provide consistent
operation and soft-start capability. A thermal shutdown
circuit provides another level of protection. The step-up
controller uses an external MOSFET, which provides
good efficiency and allows for scalable output power and
maximum operating voltage. Low feedback voltage at
each LED string (450mV) helps reduce power loss. The
A8600 features selectable switching frequency (500kHz,
750kHz, or 1MHz), which allows trade-offs between
external component size and operating efficiency.
The A8600 is available in QFN20 (4x4) Package.
FEATURES
Drives Six Parallel Strings with Multiple
Series-connected LED(s) per String
±1.5% Current Regulation Accuracy
Between Strings
Low 450mV Feedback Voltage at Full
Current Improves Efficiency
Step-Up Controller Regulates the Output
Just Above the Highest LED String Voltage
Full-Scale LED Current Adjustable from
15mA to 25mA, or Preset 20mA
Wide 100:1 Dimming Range
Programmable Dimming Control: Direct
DPWM or Analog Dimming
Built-In PLL for Synchronized Dimming
Control Open and Short LED Protections
Output Over voltage Protection
Wide Input Voltage Range from 4.5V to 26V
External MOSFET Allows a Large Number of
LED(s) per String
500kHz/750kHz/1MHz Switching Frequency
Available in QFN20 (4x4) Package
APPLICATIONS
Notebook, Sub notebook, and Tablet
Computer Displays
Automotive Systems
Handy terminals
TYPICAL APPLICATION
ORDERING INFORMATION
 
Package Type
Part Number
QFN20
Q20
A8600Q20R
A8600Q20VR
Note
R: Tape & Reel
V: Green Package
AiT provides all Pb free products, suffix “ V “ means
Green Package
REV1.0
 
-FEB 2010 RELEASED -
-1-

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