LX1686

Features: Synchronizable To Display Video Frequency High Voltage Feedback Loop Directly Controls Maximum Open Lamp And Minimum Strike VoltagesTransformer Protected From Over-Heating During Lamp Striking Micro-Amp Sleep Mode User-Programmable Fixed Frequency OperationUnder-Voltage Lockout Feature ...

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SeekIC No. : 004403437 Detail

LX1686: Features: Synchronizable To Display Video Frequency High Voltage Feedback Loop Directly Controls Maximum Open Lamp And Minimum Strike VoltagesTransformer Protected From Over-Heating During Lamp Str...

floor Price/Ceiling Price

Part Number:
LX1686
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/3/28

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Product Details

Description



Features:

   Synchronizable To Display Video Frequency
  High Voltage Feedback Loop Directly Controls Maximum Open Lamp And Minimum Strike Voltages
 Transformer Protected From Over-Heating During Lamp Striking
  Micro-Amp Sleep Mode
  User-Programmable Fixed Frequency Operation
 Under-Voltage Lockout Feature With Power- Up Reset
  Built-In Soft-Start Feature
  Operates With 3.3V or 5V Power Supplies
  100mA Output Drive Capability




Application

  Notebooks
  Instrumentation Displays
  Desktop Computer Monitors
 Low Ambient Light Displays (usedAircraft, Automobiles, and Hand-held Equipment)



Pinout

  Connection Diagram


Specifications

Supply Voltage (VDD, VDD_P) ............................................................................. 6.5V
Digital Inputs .................................................................................. -0.3 to VDD+0.5V
Analog Inputs .................................................................................. -0.3 to VDD+0.5V
Digital Outputs ................................................................................ -0.3 to VDD+0.5V
Analog Outputs ............................................................................... -0.3 to VDD+0.5V
Operating Junction Temperature
Plastic (DB, PW Packages) .......................................................................... .....150°C
Storage Temperature Range .............................................................-65°C to 150°C
Lead Temperature (Soldering, 10 seconds) .................................................... ..300°C



Description

The LX1686 Backlight Controller IC provides all the control functions needed to implement Linfinity's direct drive inverters used to operate cold cathode fluorescent lamps (CCFL's). This IC can be used to control single or multiple-lamp configurations. CCFL's are used for back or edge lighting of liquid crystal flat panel displays (LCD s) and typically find application in notebook computers, web browsers, automotive and industrial instrumentation, and entertainment systems.

The LX1686 includes a PWM controlled amp current burst circuit that can provide a >100:1 dimming range from
a simple zero to 2.5V potentiometer input. The PWM dimming burst rate is easily synchronized to the LCD panel s frame rate to prevent interference from optical beat frequencies.

LX1686 Safety and reliability features include a new dual feedback contol loop that permits regulation of maximum lamp strike voltage as well as lamp current. Regulating maximum lamp voltage permits the designer to provide for ample worst case lamp strike voltage while at the same time conservatively limit maximum open circuit voltage.

An innovative new strike voltage generation technique enables the module designer to optimize high voltage
transformer design for maximum operating efficiency with no power dissipating overhead to guarantee strike capability. Direct drive topology is a non-resonant, oscillator-controlled PWM regulation method. The LX1686 allows a wide choice of fixed operating frequencies to match lamp current frequency to the lamp's most efficient operating point, and to minimize high frequency interference.


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