"XZ686X is used for high voltage switching power supply built-in MOSFET current-mode 
 Type PWM + PFM controller family. 
 The circuit with low standby power consumption, low startup current. In standby mode, power 
 Road to enter hiccup mode, which effectively reduces the standby power circuit. 
 Circuit switching center frequency 25 ~ 67KHz, with the load. Shake 
 Switching frequency can be lower EMI. 
 Built-in peak current compensation circuit, allows different input AC voltage 
 Peak current limit line. You can also adjust the limit by adjusting the output-end resistance 
 Power. Power, the maximum peak current compensation, and then gradually reach a balance, 
 Can reduce the power transformer during the stress, to prevent transformer saturation. 
 A variety of integrated circuit abnormal state protection. Including undervoltage lock 
 Set, over-voltage protection, overload protection, leading edge blanking, the original coil over-current protection 
 Protection and temperature protection. Protection occurs in the circuit after the circuit can continue to 
 Automatic restart until the system normal. 
 "