UCC3973 - BiCMOS 冷阴极荧光灯驱动器控制器

UCC3973是TI德州仪器公司的一款CCFL背光控制器产品，UCC3973是BiCMOS 冷阴极荧光灯驱动器控制器，本站介绍了UCC3973的封装应用图解、特点和优点、功能等，并给出了与UCC3973相关的TI元器件型号供参考。

UCC3973 - BiCMOS 冷阴极荧光灯驱动器控制器 - CCFL背光控制器 - 电源管理特殊功能 - 德州仪器

产品描述

Design goals for a Cold Cathode Fluorescent Lamp (CCFL) converter used in a notebook computer or portable application include small size, high efficiency, and low cost. The UCC3972/3 CCFL controllers provide the necessary circuit blocks to implement a highly efficient CCFL backlight power supply in a small footprint 8 pin TSSOP package. The BiCMOS controllers typically consume less than 1mA of operating current, improving overall system efficiency when compared to bipolar controllers requiring 5mA to 10mA of operating current.

External parts count is minimized and system cost is reduced by integrating such features as a feedback controlled PWM driver stage, open lamp protection, startup delay and synchronization circuitry between the buck and push-pull stages. The UCC3972/3 include an internal shunt regulator, allowing the part to operate with input voltages from 4.5V up to 25V. The part supports both analog and externally generated low frequency dimming modes of operation.

The UCC3973 adds a programmable voltage clamp at the BUCK pin. This feature can be used to protect the transformer from overvoltage during startup or when an open lamp occurs. Transformer voltage is controlled by reducing duty cycle when an over-voltage is detected.

产品特性

1mA Typical Supply Current
Accurate Lamp Current Control
Analog or Low Frequency Dimming Capability
Open Lamp Protection
Programmable Startup Delay
4.5V to 25V Operation
PWM Frequency Synchronized to External Resonant Tank
8 Pin TSSOP and SOIC Packages Available
Internal Voltage Clamp Protects Transformer from Over-voltage (UCC3973)

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