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Dual-mode fully-integrated high-frequency reduction voltage power supply with high light load efficiency

A step-down power supply, light-load technology, applied in output power conversion devices, electrical components, regulating electrical variables, etc., can solve the problems of increasing the number of I/O ports, increasing the area and cost, and achieving high light-load efficiency Effect

Inactive Publication Date: 2011-01-19
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this will greatly increase the number of I / O ports, thereby increasing the area and cost

Method used

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  • Dual-mode fully-integrated high-frequency reduction voltage power supply with high light load efficiency
  • Dual-mode fully-integrated high-frequency reduction voltage power supply with high light load efficiency
  • Dual-mode fully-integrated high-frequency reduction voltage power supply with high light load efficiency

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and examples.

[0014] Such as figure 1 As shown, the dual-mode fully integrated high-frequency step-down power supply with high light load efficiency integrates a DC-DC converter on the same silicon chip, including the required step-down inductor and filter capacitor and low dropout linearity Stabilizer.

[0015] By judging the load current by the current detection module, the best working mode is selected, thereby improving the working efficiency of the power supply, especially the light load efficiency. Here, we set that when the current detection circuit detects that the load current is greater than 50mA, we choose to enter mode 1, that is, the switching power supply mode, and when the current detection circuit detects that the load current is less than 40mA, we choose to enter mode 2 , the low dropout linear regulator. Among them, 10mA is the margin for mode con...

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PUM

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Abstract

The invention belongs to the technical field of power supply, in particular to a dual-mode fully-integrated high-frequency reduction voltage power supply with the high light load efficiency, which consists of a control circuit, a power tube, an integrated inductor and a filter capacitor, wherein the control circuit consists of an error amplifier, a sawtooth generator, a soft start circuit, a comparator, a compensation circuit, a driving and dead band control circuit, a high-frequency current detection circuit, a low-dropout voltage linear voltage regulator detection circuit, a mode control module and a low-dropout voltage linear voltage regulator. In the dual-mode fully-integrated high-frequency reduction voltage power supply, load current is judged, and the optimal operating mode is selected to improve the operating efficiency of the power supply and reduce a peripheral circuit and cost; in addition, the high-frequency characteristic of the power supply also can meet the requirement of load change.

Description

technical field [0001] The invention belongs to the technical field of power supplies, and in particular relates to a fully integrated step-down power supply with high light-load efficiency for powering low-voltage and low-power integrated circuits. Background technique [0002] With the improvement of current circuit integration, it is possible to integrate low-voltage digital circuits, high-speed digital circuits, and analog radio frequency circuits on one chip. Because the working voltage required by each module is different, this multi-module chip is also It is determined that it needs to be powered by multiple voltages. However, this will greatly increase the number of I / O ports, thereby increasing the area and cost. The fully integrated step-down power supply can perform voltage conversion well without external components, greatly simplifies the complexity of packaging, has the advantages of high efficiency and low cost, and can solve the previous problems well; secon...

Claims

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Application Information

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IPC IPC(8): H02M3/157
Inventor 龚晓寒陈伟倪金华洪志良
Owner FUDAN UNIV
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