At low output voltage, the majority of the rated power of traditional adjustable linear power supply is wasted in the internal power supply and the conversion efficiency is low with huge volume.

传统的可调整线性电源在输出电压低时，电源的大部分额定功率耗费在电源内部，变换效率很低，而且体积庞大笨重。

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For the use of off-line switching mode power supply IC, an internal power supply circuit combining with a high voltage startup current source is proposed.

结合高压启动恒流源设计了一种用于离线式开关电源的内部电源电路。

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