HIGH VOLTAGE START-UP CIRCUIT FOR ZEROING OF STANDBY POWER CONSUMPTION AND SWITCHING MODE POWER SUPPLY HAVING THE SAME

摘要

A high voltage startup circuit is disclosed. The high voltage startup circuit includes a power supply terminal for supplying power, a first PMOS transistor connected to the power supply terminal, and a first NMOS transistor and a second PMOS transistor connected to the first PMOS transistor to form a latch structure. And a latch unit including a second NMOS transistor connected to the second PMOS transistor, a first capacitor supplying a first voltage to a drain of the second PMOS transistor, and a second voltage to a drain of the first PMOS transistor. A charge sharing unit including a second capacitor and a switch unit forming a current path for charging a voltage supplied from the power supply terminal based on the first voltage and the second voltage to an external capacitor as a power voltage. do.