Gate driver for driving a switching element, and a power converter in which the gate driver and an output element are integrated in one-chip

摘要

The gate driver includes a high-side gate driver circuit (201) for driving a high-side switching element (6) in response to a high-side input signal (HS) and a low-side gate driver circuit (202) for driving a low-side switching element (8) in response to a low-side input signal (LS), to control the switching elements connected in a push-pull structure. There are respective edge detection circuits (1', 19) for detecting the edges of the input signals (LS, HS) and driving the respective switching elements. An ON pulse generation circuit generates an ON pulse (Pon) in response to the leading or trailing edge of the HS edge detection circuit control input signal, which is detected by a first edge detection circuit. An OFF pulse generation circuit generates an OFF pulse (Poff1) based on detection outputs of the edge detection circuits. A latch circuit (4') is supplied with the ON and OFF pulses, for holding ON/OFF information of the HS switching element. A drive circuit (5) outputs a HS gate signal for controlling the HS switching element in accordance with the ON/OFF information. When driving the LS switching element is instructed by the LS input signal, the OFF pulse is generated by the OFF pulse generation circuit (3) to forcedly turn off the HS switching element.