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ADD8754 데이터시트(PDF) 1 Page - Analog Devices |
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ADD8754 데이터시트(HTML) 1 Page - Analog Devices |
1 / 28 page LCD Panel Power, VCOM, and Gate Modulation ADD8754 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2005 Analog Devices, Inc. All rights reserved. FEATURES Step-up switching regulator with 2 A power switch 650 kHz or 1.2 MHz switching frequency Output adjustable to 20 V 350 mA logic voltage regulator Selectable output voltages: 2.5 V, 2.85 V, 3.3 V VCOM amplifier with 300 mA drive Gate pulse modulation circuitry Independently adjustable delay and falling slope General 3 V to 5.5 V input Undervoltage lockout Thermal shutdown 24-lead, Pb-free LFCSP package APPLICATIONS TFT LCD panels for monitors, TVs, and notebooks FUNCTIONAL BLOCK DIAGRAM ADD8754 VGH VGH_M VDD_1 CE RE VFLK VDPM GATE PULSE MODULATION VCOM AMPLIFIER LOGIC VOLTAGE REGULATOR UNDER VOLTAGE LOCKOUT AND THERMAL PROTECTION FB FREQ SHDN VDD_2 OUT STEP-UP SWITCHING REGULATOR VIN_2 VIN_1 SS COMP LDO_OUT ADJ LX POS NEG Figure 1. GENERAL DESCRIPTION The ADD8754 is optimized for use in TFT LCD applications, requiring only external charge pump components to provide all the requirements for panel power, VCOM, and gate modulation. Included in a single chip are a high frequency step-up dc-to-dc switching regulator, logic voltage regulator, VCOM amplifier, and gate pulse modulation circuitry. The step-up dc-to-dc converter provides up to 20 V output and includes a 2 A internal switch. Either a 650 kHz or 1.2 MHz step- up switching regulator frequency can be chosen, allowing easy filtering and low noise operation. It achieves 93% efficiency and features soft start to limit the inrush current at startup. The internal voltage regulator operates with an input voltage range of 3 V to 5.5 V and delivers a load current of up to 350 mA. Three selectable output voltages are available: 2.5 V, 2.85 V, and 3.3 V. The proprietary VCOM amplifier can deliver a peak output current of 300 mA and is specifically designed to drive TFT panel loads. The gate pulse modulator allows shaping of the TFT gate high voltage to improve image quality. The integrated switches provide the ability to independently control the delay and slope for the gate drive voltage. The ADD8754 is offered in a 24-lead, Pb-free LFCSP package and is specified over the industrial temperature range of −40 to +85°C. |
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