Power and Bias for LCD Panel

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Power and Bias for LCD Panel

By Hector Ng Technical Marketing
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Products for TFT LCD Module (I)
Operational Amplifier Gamma Buffers VCOM
Amplifiers Integrated DC-DC Converters
Generate main, Von and Voff by one single IC
Backlight Products White LED Drivers
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Products for TFT LCD Module (II)
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Portable DVD/TVEL7583 for Panasonic TFT LCD Panel
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EL7583 3 Channel DC-DC (Main, Von, Voff)

• Channel 1 Boost Regulator
• Supports output up to 17V and power exceed 5W.
• Adjustable switching frequency 2001000KHz.
• Channel 2 Positive charge pump
• Support output up to 40V.
• Channel 3 Negative charge pump
• Support output up to -40V.
• Switching frequency of the charge pumps are set
  to ½ of the boost converter switching frequency.

• Vin 2.7V to 14V.
• Low shutdown and operating current.
• Operating Temperature
• -40oC to 85oC
• Package
• TSSOP20

0.22W RDSon Main Switch
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EL7581 3 Channel DC-DC (Main, Von, Voff)

• Channel 1 Boost Regulator
• Supports output up to 17V and power exceed 8W.
• Adjustable switching frequency 2001000KHz.
• Channel 2 Positive charge pump
• Support output up to 40V.
• Channel 3 Negative charge pump
• Support output up to -40V.
• Switching frequency of the charge pumps are set
  to ½ of the boost converter switching frequency.

• Vin 2.7V to 14V.
• Low shutdown and operating current.
• Operating Temperature
• -40oC to 85oC
• Package
• HTSSOP20 (with thermal pad)

0.15W RDSon Main Switch
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EL7584 3 Channel DC-DC VCOM Buffer

• Channel 1 Boost Regulator
• Supports output up to 17V and power exceed 8W.
• Adjustable switching frequency 2001000KHz.
• Channel 2 Positive charge pump
• Support output up to 40V.
• Channel 3 Negative charge pump
• Support output up to -40V.
• VCOM buffer
• ICOM 150mA typ.
• Switching frequency of the charge pumps are set
  to ½ of the boost converter switching frequency.

• Vin 2.7V to 14V.
• Low shutdown and operating current.
• Operating Temperature
• -40oC to 85oC
• Package
• TSSOP24

EL7583 VCOM Buffer
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EL5825 TFT LCD Reference Voltage Generator

• 8 channel rail-to-rail reference outputs.
• Supply voltage 4.5 to 16.5V.
• Serial interface controls outputs with 10 bits
  resolution.
• Package TSSOP24 or QFN24.

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DC-DC converters

• Various sources
• ST, Toshiba, NJRC, Intersil, Microchip, Vishay
• Full supply of diodes, inductor, MLCC and Tan-
  cap
• ST, Toshiba, MCC, Murata, Vishay

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Op-amp

• Various sources
• ST, NJRC, Intersil, Microchip

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DCP Digital Potentiometer

• Intersil-Xicor is the 1 vendor of DCP in the
  world.
• Resolution 16 to 1024 taps.
• Positive or negative pot voltages.
• Vcc range 2.7 to 13V.
• Single, dual or quad.
• Volatile or non-volatile versions.

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DCP Architecture
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DCP Control Options