Internal power supply circuit started with high voltage and constant current

An internal power supply, high-voltage constant-current technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as instability, high output voltage Uout value, capacitor charging and discharging and temperature effects, etc., to achieve excellent The effect of load capacity and good temperature characteristics
CN101901019AActive Publication Date: 2010-12-01昌芯(西安)集成电路科技有限责任公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
昌芯(西安)集成电路科技有限责任公司
Publication Date
2010-12-01

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Abstract

The invention discloses an internal power supply circuit started with high voltage and constant current, which is used for generating stable internal power supply voltage and comprises a high voltage resistant LDMOS tube isolation circuit, a constant current charging circuit, a voltage reference circuit and a level shifting circuit, wherein the high voltage resistant LDMOS tube isolation circuit comprises a current limiting resistor R1 and a N-channel high voltage resistant LDMOS tube MN1, wherein the high voltage resistant LDMOS tube MN1 is used as an adjusting tube, and the input end is connected with a power supply pin HVin and simultaneously receives the signals of overvoltage control circuits in the constant current charging circuit and the level shifting circuit, thereby ensuring the normal starting of the circuit and the stability of the output voltage. In the invention, a high-voltage LDMOS tube is used for carrying out high-voltage isolation, so that the circuit has higher breakdown voltage, larger safe operation area and lower on-resistance.
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Description

technical field

[0001] The invention relates to an internal power supply circuit started by high voltage constant current, which belongs to the field of electronic technology, and in particular relates to a circuit of internal power supply voltage in the design of a digital-analog hybrid integrated circuit. Background technique

[0002] Nowadays, switching power supply is widely used because of its high power conversion efficiency and other excellent characteristics. The internal power supply of off-line switching power supply chips cannot be directly provided by external AC or high-voltage direct current. Therefore, it is necessary to design an internal power supply circuit to provide stability for the chip. power supply voltage.

[0003] The internal power supply circuit is used in the design of converting the input high voltage into a stable power supply voltage inside the chip in the digital-analog hybrid integrated circuit. During the working process of the chip, it is ...

Claims

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