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High-performance switching power supply chip trimming circuit

A technology for switching power supply chips and trimming circuits, which is applied in the direction of logic circuit interface devices, logic circuit connection/interface layout, etc., which can solve the problems of chip precision and performance difference, not meeting design expectations, and inability to change, etc., to achieve production process compatibility Good performance, low price, and the effect of avoiding the influence of encapsulation

Inactive Publication Date: 2017-12-29
许亚夫
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For analog circuits, once the chip is taped out, the relevant characteristics of the circuit are determined and cannot be changed.
However, affected by non-ideal factors such as the process environment, some parameters do not meet the design expectations, resulting in a far cry from the expected accuracy and performance of the chip after tape-out

Method used

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  • High-performance switching power supply chip trimming circuit
  • High-performance switching power supply chip trimming circuit
  • High-performance switching power supply chip trimming circuit

Examples

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with drawings and embodiments.

[0030] Such as figure 1 , In the anti-fuse trimming unit circuit, the Zener diode is used as an anti-fuse trimming diode. The bias voltage provided for the bias circuit. BIT is used as the output of the four-input NAND gate of the bit selection signal, that is, the counting state output is connected.

[0031] During the permanent trimming process, the counter starts counting. When the counting state makes the BIT signal of the corresponding trimming unit low, the unit is selected. At this time, the PTRIM-EN is controlled to be low, and the M0 and M1 branches have current flowing. M3 is an inverse ratio tube, the width-to-length ratio of the tube is very small, so that the base potential of M4 is pulled up, M4 is turned on and is in the deep linear region, and the VCC voltage is pulled up to above the breakdown voltage of the Zener diode through external control , so ...

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Abstract

A high-performance switching power supply chip trimming circuit is suitable for the power supply field. Trim circuit consists of anti-fuse trim unit circuit, bias circuit, control pin UV / OV module circuit, high voltage current source, trim mode switching circuit, line voltage latch overvoltage detection circuit, latch hysteresis overvoltage circuit composition. The diode anti-fuse trimming scheme is adopted. After trimming, the chip has good production process compatibility, and is inexpensive to implement, avoids the influence of packaging, and has higher precision.

Description

Technical field [0001] The invention relates to a high-performance switching power supply chip trimming circuit, which is suitable for the field of power supply. Background technique [0002] At present, power equipment and electronic products have completely entered people's production and life, and any electrical equipment needs a power system to provide it with a stable and reliable power supply. Since the advent of the switching power supply system in the 1960s, relying on its small size, light weight and high efficiency, it has gradually replaced the previous bulky linear regulator and has received more and more attention. At present, switching power supplies have been applied to various power electronics fields. [0003] The rapid development of integrated circuit technology also makes the switching power supply system gradually integrated. The switching power supply chip, also known as the power management chip, integrates many earlier peripheral discrete devices in...

Claims

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Application Information

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IPC IPC(8): H03K19/0175
CPCH03K19/017509
Inventor 许亚夫
Owner 许亚夫
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