A kind of nmos power tube gate clamp drive module, drive circuit and switching power supply

Abstract

The invention provides an NMOS power tube grid clamping driving module, a driving circuit and a switching power supply, the NMOS power tube grid clamping driving module comprises a BOOST capacitor charging module, a reference current source module, a level transfer module and a power tube driving module, and the NMOS power tube grid clamping driving module is realized by adopting a transistor integrated circuit process. Compared with the prior art, the NMOS driving function with complete functions can be achieved through fewer transistors, and the NMOS power tube grid clamping driving module,the driving circuit and the switching power supply have the advantages of being simple in structure, low in cost and high in reliability, have good anti-latch-up capacity and anti-interference capacity due to the fact that all devices are isolated from one another in the transistor process, and are suitable for a high-voltage and high-power switching power supply.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to an NMOS power transistor grid clamp drive module, a switching power supply drive circuit and a switching power supply. Background technique [0002] There are two types of power transistors and power MOS tubes in the switching power supply chip. The power MOS tubes are divided into PMOS power tubes and NMOS power tubes. Because the majority of carriers are different in their internal work, NMOS power tubes are different from PMOS power tubes. The on-resistance of the tube is smaller under the same unit area, that is, the performance of the NMOS power tube is relatively better, so the application prospect of the NMOS power tube is broader. [0003] Common switching power supply chips can be divided into step-down chips and boost chips according to different internal structures. If the power tube inside the step-down chip chooses an NMOS power tube, it will generally choose ...

AI Technical Summary

Problems solved by technology

In switching power supply chips based on CMOS technology, due to the high parasitic capacitance of MOS itself and the incomplete isolation of MOS devices, there are many considerations in the circuit design inside the chip, and the entire drive circuit is large in scale and high in cost.

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