High-voltage withstanding PNP-type anti-backflow power driver and manufacturing method thereof

Abstract

The invention relates to a high-voltage withstanding PNP-type anti-backflow power driver and a manufacturing method thereof. The power driver comprises a PNP transistor and a pull-up resistor, whereinone end of the pull-up resistor is connected with the emitter of the PNP transistor and the other end is connected with the base of the PNP transistor, and thus, potential pull up of the base is realized; and the emitter of the PNP transistor is used as an input end of the power driver. The power driver also comprises an anti-backflow diode, the anode of the anti-backflow diode is connected withthe collector of the PNP transistor, and the cathode of the anti-backflow diode is used as an output end of the power driver. Compared with the prior art, the power driver provided in the invention has the advantages of simple structure, simple and convenient manufacturing process, good performance and low cost.

Description

technical field [0001] The invention relates to a power driver for external expansion and a manufacturing method thereof, in particular to a high withstand voltage PNP type anti-backfeed power driver and a manufacturing method thereof. Background technique [0002] With the continuous development and progress of power devices, application circuits are becoming more and more complex, and the requirements for control circuits and drive technology are also getting higher and higher. Although the efficiency of a single power device is improved and the control is simplified, the complexity of the circuit puts forward new requirements for users, so it is necessary to provide an integrated high-voltage withstand power driver. [0003] The basic working principle of LDO (low dropout linear regulator) is as follows: when the system is powered on, if the enable pin is at a high level, the circuit starts to start, the constant current source circuit provides bias for the entire circuit...

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Problems solved by technology

[0004] The reason for the back-feeding current of the existing LDO power supply is usually the moment when the power supply is turned on and off. In practical applications, the output voltage will be higher than the input voltage for a short time. Piezocapacitor, the current will flow reversely from the output terminal to the input terminal, which may cause damage to the power driver or the front circuit

At present, the usual anti-backfeed method is to connect discrete components at the input end, and diodes or MOS tubes can be used. However, this method has low cost performance and low reliability. Therefore, how to design a high withstand voltage with its own current anti-backfeed function The power drive is an important issue

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