DC/DC switch converter power output transistor-driven integrated driving circuit

Abstract

Disclosed is a DC / DC switch converter power output transistor-driven integrated driving circuit. The integrated driving circuit comprises a high-order driving preceding stage buffer, a bootstrap capacitor, a capacitor coupling driving circuit and a second phase inverter; a high-order driving control signal is input from the high-order driving preceding stage buffer, and after the high-order driving control signal is buffered, a high-order buffer driving signal is output to the negative electrode plate of the bootstrap capacitor and the second phase inverter; the second phase inverter, the bootstrap capacitor and the capacitor coupling driving circuit perform cooperative work to improve the signal potential of the high-order buffer driving signal; and after a high-order N type electric power transistor is switched on, the capacitor coupling driving circuit outputs the high-order driving signal with high driving capability to the gate of the high-order N type electric power transistor. By virtue of the integrated driving circuit, the complex matched circuit in the prior art is simplified, so that the high-order preceding stage driving buffer does not need isolation type devices, thereby lowering device requirement and reducing the area of the integrated circuit; and meanwhile, a high-order level displacement circuit and anti-series-connection circuits of high-order and low-orderN type electric power transistors are simplified, the circuit efficiency is improved, and circuit time delay is lowered.

Description

technical field [0001] The invention belongs to a DC power conversion circuit and system; in particular, it relates to an integrated drive circuit of a DC / DC switching power converter using double NMOS power transistors as a power output power circuit architecture. Background technique [0002] In the prior art, DC / DC switching converters used to convert a known DC input voltage into a required DC voltage can be divided into BUCK (step-down), BOOST (boost), BUCK-BOOST (boost pressure - buck) three. In the prior art, the rectification mode of the DC / DC switching converter includes two working modes of asynchronous rectification and synchronous rectification. In the prior art, the DC / DC switching converter includes two modulation modes of the control signal: pulse width modulation (PWM) and pulse frequency modulation (PFM). In the non-synchronous rectification mode, the diode is used as the rectifier tube. In the synchronous rectification mode, the low-resistance power MOSFE...

AI Technical Summary

Problems solved by technology

[0017] The technical problem to be solved by the present invention is to avoid the shortcomings of the above-mentioned prior art and propose a more simplified high-position N-type power transistor VT h The drive circuit can not only simplify the complex high-level level shift circuit in the prior art, improve circuit efficiency, reduce circuit delay; and can simplify the corresponding supporting circuit

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