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Audio avoidance and semi-logarithmic scale digital-to-analog converter for switched DC converter

A technology of DC converter and digital-to-analog converter, which is applied in the direction of digital-to-analog converter, DC power input to DC power output, output power conversion device, etc., can solve problems such as increasing chip power consumption, and achieve optimized power consumption , the effect of fast response and shortened adjustment time

Active Publication Date: 2022-02-18
SUZHOU POWERLINK MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is obvious. The large enough on-chip load current increases the power consumption of the chip in PFM mode, which to a large extent offsets the advantages of PFM mode in reducing chip power consumption and improving energy conversion efficiency.

Method used

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  • Audio avoidance and semi-logarithmic scale digital-to-analog converter for switched DC converter
  • Audio avoidance and semi-logarithmic scale digital-to-analog converter for switched DC converter
  • Audio avoidance and semi-logarithmic scale digital-to-analog converter for switched DC converter

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Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts all belong to the protection scope of the present invention.

[0029] Let's first derive Boost's PFM frequency f PFM with load current I load Relationship. Figure 4 draw out figure 1 Shown is the inductor current in the PFM working state when Boost adopts the current control mode. It is not difficult to find out its PFM frequency f PFM for:

[0030]

[0031] in:

[0032] η is the energy efficiency of the Boost power stage, usually in the range of 90% to 98%

[0033] V out and V in are the input and output voltages of Boost

[0034] L is the inductance value

[0035] I peak is the peak current of t...

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Abstract

The invention discloses an audio avoidance (OoA: out of audio) and semi-logarithmic scale digital-to-analog converter of a switch-type DC converter, and belongs to the technical field of design of semiconductor chips, during working, the adjustment step length of input data of a current digital-to-analog converter (IDAC) is changed along with the current input data thereof. The piecewise linearity ensures that the ratio of the change step length to the current input data is smaller than the precision of frequency control, and the logarithmic scale of the whole process reduces the search locking time of the IDAC value, so that the on-chip current adjustment time is shortened, the noise possibly generated in the adjustment process is avoided, the on-chip load current is generated by the optimal method. The size of the on-chip OoA load current is controlled in a self-adaptive mode, so that the on-chip OoA load current is minimized to improve the energy conversion efficiency in the PFM mode.

Description

technical field [0001] The invention belongs to the technical field of semiconductor chip design, and in particular relates to audio avoidance of a switch-type DC converter and a semi-logarithmic scale digital-to-analog converter. Background technique [0002] With the continuous expansion of electronic technology applications, such as the rapid development of mobile phones, drones, artificial intelligence, electric vehicles, etc., the demand for semiconductor chips continues to expand. At the same time, new applications also put forward higher requirements on the performance of chips. Power management chips, especially switching DC-DC converters ( figure 1 Shown) are more and more widely used, and the market's performance requirements for products are also getting higher and higher. PWM / PFM is the most common control mode for DC-DC voltage converters. When the load current (I load ) is large, the DC-DC converter works in pulse-width modulation (PWM: pulse-width modulati...

Claims

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Application Information

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IPC IPC(8): H03M1/66H02M3/157H02M3/158
CPCH03M1/66H02M3/157H02M3/1584
Inventor 万海军宋文星李健平常华东
Owner SUZHOU POWERLINK MICROELECTRONICS