Quad-Output TFT LCD Bias DC-DC Converter CXLC8999/B DC-DC converter provides regulated voltages required by thin-film transistor (TFT) liquid crystal displays (LCD) panels in TSSOP package. One step-u

   产品概述 返回TOPrwq嘉泰姆

The CXLC8999/B DC-DC converter provides regulated voltages required by thin-film transistor (TFT) liquid crystal displays (LCD) panels in TSSOP package. One step-up converter, one step-down converter, and two charge pumps convert the 8V to 14V input voltage into four output voltages. These features complete the powersupply requirements of large screen LCD panels. The step-up converter provides source voltages VS and the step-down converter provides logic voltage for the system. The dual charge pumps independently generate adjustable regulated output voltages VGL and VGH to bias the LCD. These four blocks operate with a fixed switching frequency of 500kHz or 750kHz. Both step-up and step-down converters operate in asynchronous switch mode. Current mode control provides fast transient response and eases loop stabilization. Fault protection includes cycle-by-cycle current limit, thermal shutdown, overvoltage protection of the step-up converter and short-circuit protection of the step-down converter. Current mode control is used for both charge pumps to regulate its output voltage, which minimizes output ripple and capacitor sizes. The CXLC8999/B is available in an 28-pin TSSOP package.

   产品特点 返回TOPrwq嘉泰姆

„ 8V to 14V Input Voltage Range rwq嘉泰姆

„ VS Output Voltage Range up to 19 V rwq嘉泰姆

„ 1% Accurate Boost Converter with 3A Switch Current rwq嘉泰姆

„ 1.5% Accurate 2.3A Step-Down Converter rwq嘉泰姆

„ 500kHz/750kHz Fixed Switching Frequency rwq嘉泰姆

„ 150mA Negative Charge Pump Driver for VGL rwq嘉泰姆

„ 150mA Positive Charge Pump Driver for VGH rwq嘉泰姆

„ Adjustable Sequencing for VGL, VGH rwq嘉泰姆

„ Gate Drive Signal to Drive External MOSFET rwq嘉泰姆

„ Internal and Adjustable Soft Start rwq嘉泰姆

„ Cycle-by-Cycle Over Current Protection rwq嘉泰姆

„ Short-Circuit Protection rwq嘉泰姆

„ Overvoltage Protection rwq嘉泰姆

„ Thermal Shutdown rwq嘉泰姆

„ Available in TSSOP-28 Packagerwq嘉泰姆

   应用范围 返回TOPrwq嘉泰姆

„ TFT LCD Displaysrwq嘉泰姆

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