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LCD Television

Vishay components used:

  • Power MOSFETS
  • Controller Power ICs
  • Optocouplers
  • Schottky Diodes / Rectifiers
  • Ultrafast Rectifiers
  • TVS
  • Bridge Rectifiers
  • Zener Diodes
  • Switching Diodes
  • Aluminum Electrolytic Capacitors
  • High-Voltage Resistors
  • NTC and PTC Thermistors
  • Inductors / EMI Filters
  • Secondary Protection Fuses
  • IR Receivers
  • Ambient Sensors
  • LDOs
  • Analog Switches

LCD TV design is separated into three segments: Main Circuit Board, Backlight Inverter, and Power Supply. The Main Circuit Board segment involves hardware device and power sources. For power sources, using a switching mode is an excellent way to improve converter efficiency. High current is its key feature. Power sources that use this technology include system power, power switching, and Class D audio amplification. Low-dropout linear power is another solution for converter efficiency. Its main benefits are low prices and simple circuitry. Hardware can be regarded as a non-power segment. Type of hardware includes remote controls, sensors, and interface protection devices. Some of these need similar functions, such as ESD protection, current limiting, and load switching. The Backlight Inverter segment includes lighting igniters, protection devices, and MOSFET drivers. For lighting igniters, high voltage is a key design concern. Ceramic disc capacitors can meet 6 kV and provide good decoupling. The Power Supply segment involves open-frame switching mode power supplies. Components for primary AC applications include EMI filters, bridge rectifiers, buck capacitors, and PFC rectifiers. The most important design concept is PFC, which involves efficiency improvement. When a PFC rectifier performs well, the power supply can be efficient at a light current load. Regarding secondary side design, the output rectifier is the most important device, especially for multi-output of power supplies. The Trench MOS Schottky rectifier features both high current capabilities and good forward voltage performance at high ambient temperatures. Different solutions are based on different specifications.

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