- 制造厂商：TI
- 产品类别：电源管理
- 技术类目：LED 驱动器 - 背光 LED 驱动器
- 功能描述：具有灯强度控制功能的 BiCMOS 冷阴极荧光灯驱动器控制器
- 点击这里打开及下载UCC3972的技术文档资料
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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.
- 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)
- Number of channels (#)
- 1
- Vin (Min) (V)
- 4.5
- Vin (Max) (V)
- 25
- Vout (Max) (V)
- 18
- Switching frequency (Max) (kHz)
- 220
- Features
- Adjustable Switch Frequency
- Operating temperature range (C)
- 0 to 70
UCC3972的完整型号有：UCC3972PW，以下是这些产品的关键参数及官网采购报价：
UCC3972PW，工作温度：0 to 70，封装：TSSOP (PW)-8，包装数量MPQ：150个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网UCC3972PW的批量USD价格：4.375（1000+）
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