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

Active 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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Problems solved by technology

refer to figure 2 , however, the output voltage Uout generated in this way is usually high, and

Method used

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  • Internal power supply circuit started with high voltage and constant current
  • Internal power supply circuit started with high voltage and constant current
  • Internal power supply circuit started with high voltage and constant current

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[0022] In order to make the objectives, technical solutions and advantages of the present invention more clearly expressed, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] The following combination image 3 with Figure 4 The specific circuit structure of a preferred embodiment of the present invention will be described. image 3 Is the structural block diagram of the present invention; Figure 4 It is a specific circuit diagram according to the present invention.

[0024] reference image 3 According to the present invention, a high-voltage constant-current start-up internal power supply circuit is used to generate a stable internal power supply voltage, including a high-voltage resistant LDMOS tube isolation circuit, a constant current charging circuit, a voltage reference circuit and a level shift circuit. The input end of the high-voltage resistant LDMOS tube isolation circuit is conne...

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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.

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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Application Information

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IPC IPC(8): G05F3/26
Inventor 代国定方展忠刘文昊杨令
Owner 昌芯(西安)集成电路科技有限责任公司
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