OPERATION MODE CONTROL DECIVE OF DC-DC CONVERTER

摘要

PURPOSE: An operation mode control device of a DC-DC converter is provided to improve a regulation property by rapidly changing an operation mode according to the change of a load or an input voltage. CONSTITUTION: An operation mode switching unit(240) outputs a pulse width modulation signal to a gate driver(250) in a normal mode. The pulse width modulation signal is outputted from a normal driving gate pulse generating unit(220). The gate driver drives a charge switch. The operation mode switching unit outputs an operation mode switching signal to the gate driver in a pulse skip mode. The operation mode switching signal is outputted from a pulse skip mode signal generating unit(230). [Reference numerals] (233) On-time comparator; (234) Pulse skip mode operation unit; (240) Operation mode switching unit; (250) Gate driver; (AA) Minimum on-time pulse;