说明：  G3525 芯片内置了5.1V 基准电压源、100Hz～ 500KHz 宽频率振荡器、软启动电路、误差放大器、PWM 比较器、欠压封锁电路及功率管输出驱动电路等。
(G3525 chip has built-in 5.1V reference voltage source, 100Hz ~ 500KHz broadband oscillator, soft start circuit, error amplifier and PWM Comparator, under voltage blocking circuit and power transistor output drive circuit.)