HIGH VOLTAGE DRIVER CAPABLE OF PREVENTING HIGH VOLTAGE STRESS ON TRANSISTORS
First Claim
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.
1 Assignment
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Accused Products
Abstract
A high voltage driver includes a charge pump, a level shift circuit, a first string of diodes, and a second string of diodes. The charge pump adjusts a driving voltage according to a feedback voltage. The level shift circuit generates an output voltage according to the at least one control signal, and the level shift circuit includes a plurality of stacked transistors for relieving a high voltage stress caused by the driving voltage, and a plurality of control transistors coupled to the plurality of stacked transistors for controlling the output voltage. The first string of diodes provides a plurality of divisional voltages between the driving voltage and a reference voltage, and each of the stacked transistors has a control terminal receiving a corresponding divisional voltage of the plurality of divisional voltages. The second string of diodes provides the feedback voltage.
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Citations
12 Claims
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1. A high voltage driver comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification