STR-E1565是一个混合开关电源集成电路，它采用21脚封装，其内含两个变换器，前端是一个用于消除高次谐波的PFC控制电路，后端是一个DC/DC变换器。 
序号  英文名称   引脚功能                              开机电压    待机电压
1     Startup    启动电压接入脚                        420V        317V
3     PFC out    PFC 驱动输出脚                        5.5V        0V
4     ZCD PFC    过零检测脚                            3.10V       0V
5     CS PFC     电流取样                              0.022V      0V
6     PFB/OVP    PFC 稳压控制信号，过压保护检测输入脚  4.14V       3.13V
7     COMP       误差放大器输出脚，相位补偿            2.22V       0.45V
8.9   GND        接地                                  0V          0V
10    MULTFP     电压取样                              0.868V      1.34V
11    DLP PFC    延迟导通滤波端                        0.33V       5.58V
12    BD PWM     过零检测/延迟导通输入端               0.88V       0.18V
13    OCP PWM    过流检测输入                          0.01V       0V
14    DFB        稳压反馈输入                          3.88V       3.59V
15    Vcc IC     供电电源端                            16.89V      16.59V
17    Souce      内部MOS 管的源极                      0.02V       0V
21    d rain     内部MOS 管的漏极                      393.2V      314.8V
小结：由于PFC 电路输出整流二极管的损坏，造成PFC 电压无法升到正常值。