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②U802内部电路框图如图3所示,内部含有两个变换器,前端是一个用于PFC(功率因素校正)电路的变换器,后面是主电源DC/DC变换器;内部电路包括:启动控制、振荡电路、误差放大电路、PFC电路、过电压/欠电压保护电路、过电流保护电路、过热保护电路、PFC驱动电路和开关管QS01等。STR-E1565引脚功能和对地参考电压见表1所示。
②U802 internal circuit block diagram shown in Figure 3, the internal contains two converters, the front is a PFC (power factor correction) circuit converter, followed by the main power DC / DC converter; internal circuits include: start control, Oscillation circuit, error amplifier circuit, PFC circuit, over-voltage / under-voltage protection circuit, over-current protection circuit, over-temperature protection circuit, PFC drive circuit and switch QS01. STR-E1565 pin function and the ground reference voltage shown in Table 1.