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DC-DC LED Drivers | NCP5030
概览
NCP5030 是一款固定频率 PWM 降压-升压转换器，适用于驱动大功率白色 LED 等恒定电流应用。降压-升压在 H 桥拓扑结构中实施，具有自适应结构，以三种模式之一运行：升压、降压-升压或降压，具体取决于输入和输出电压条件。此器件适用于在便携式应用中实现高能效，能够为手电筒/探照灯应用以高达 900 mA 的直流电路驱动大功率 LED。为了保护该器件，结合了按周期电流限制和高温关断电路，以及输出过电压保护。700 kHz 开关频率允许使用低值 4.7 µH 和陶瓷电容器。
- LED Drive from Alkaline Batteries
- Flash Lights
- Efficiency: 87% at 500 mA and 3.3 V VIN
- Internal Synchronous Rectifier, No Schottky Diodes
- Adjustable Switching Limit Current to Optimize inductor size
- 0.3 µA Shut-down Control with True-Cut off
- Input Voltage Range from 2.7 V to 5.5 V
- 200 mV Feedback Voltage
- Output Over-voltage and Thermal Shut Down Protection
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