Buck converter bootstrapping drive circuit

The utility model discloses a buck converter bootstrapping drive circuit, including main circuit, auxiliary electrical power source, control circuit, driver chip, boostrap circuit and the control circuit that charges that boots, control circuit provides the signal square wave for driver chip, driver chip gives main circuit and the bootstrapping control circuit that charges according to the corresponding drive signal of signal square wave output, the boostrap circuit is connected with driver chip and exports for the drive provides corresponding level conversion, control circuit is charged in the bootstrapping provides charging loops for the boostrap circuit. The utility model discloses a bootstrapping charge control circuit can be in the circuit start -up course for the bootstrapping electric capacity in the boostrap circuit provides charging loops, realize the self -starting function of boostrap circuit, and the self -starting function does not receive loading condition's influence, bootstrapping is simultane