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HIGH VOLTAGE DRIVER CAPABLE OF PREVENTING HIGH VOLTAGE STRESS ON TRANSISTORS

  • US 20190214975A1
  • Filed: 07/25/2018
  • Published: 07/11/2019
  • Est. Priority Date: 01/10/2018
  • Status: Active Grant
First Claim
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1. A high voltage driver comprising:

  • a charge pump having an output terminal configured to output a driving voltage, and a feedback terminal configured to receive a feedback voltage, the charge pump being configured to adjust the driving voltage according to the feedback voltage;

    a level shift circuit coupled to the output terminal of the charge pump and a system voltage terminal, and configured to receive at least one control signal and generate an output voltage according to the at least one control signal, the level shift circuit comprising;

    a plurality of stacked transistors configured to relieve a high voltage stress caused by the driving voltage; and

    a plurality of control transistors coupled to the plurality of stacked transistors and configured to control the output voltage;

    a first string of diodes coupled in series between the output terminal of the charge pump and the system voltage terminal, and configured to provide a plurality of divisional voltages between the driving voltage and a reference voltage provided by the system voltage terminal, wherein each of the plurality of stacked transistors has a control terminal configured to receive a corresponding divisional voltage of the plurality of divisional voltages; and

    a second string of diodes coupled in series between the output terminal of the charge pump and the system voltage terminal, and configured to provide the feedback voltage.

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