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Quasifixed conducting time control circuit and step-down type switch adjusting circuit

A technology of fixed on-time and switch adjustment, which is applied in the direction of control/regulation system, adjustment of electrical variables, electrical components, etc., can solve the problems of increasing chip package size, chip manufacturing cost and usage cost, etc., and achieve chip package size change Small size, reduced chip manufacturing cost, and reduced user cost

Active Publication Date: 2014-08-13
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] exist figure 1 In the step-down switching regulator circuit 10 shown, since it includes the output voltage port VOUT, the frequency setting port FREQ and the frequency setting resistor R TON , chip package size increases, chip manufacturing cost and user cost increase

Method used

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  • Quasifixed conducting time control circuit and step-down type switch adjusting circuit
  • Quasifixed conducting time control circuit and step-down type switch adjusting circuit
  • Quasifixed conducting time control circuit and step-down type switch adjusting circuit

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Embodiment Construction

[0043] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are represented by similar reference numerals. For the sake of clarity, the various parts in the drawings are not drawn to scale.

[0044] The circuit of the embodiment of the present invention will be described in detail below. In the following description, some specific details are used to provide a better understanding of the embodiments of the present invention. Those skilled in the art can understand that even in the absence of some details or other methods, materials, etc., the embodiments of the present invention can be implemented.

[0045] figure 2 The on-time generation circuit 2011 according to an embodiment of the invention is shown. The on-time generation circuit 2011 is used in a step-down switching regulator circuit controlled by a PCOT control circuit.

[0046] Such as figure 2 As shown, the shown on-t...

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PUM

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Abstract

The invention discloses a quasi-fixed conduction time control circuit and a step-down switch regulation circuit. The conduction time generating circuit receives the output signal of the control circuit and the output signal of the step-down switching regulator circuit and generates a conduction time signal. Using the on-time generating circuit disclosed in the present application can reduce the size of the chip and reduce the cost of manufacturing and using the chip.

Description

Technical field [0001] The embodiment of the present invention relates to a step-down switching regulator circuit, and more specifically, to a quasi-fixed on-time control circuit and a step-down switching regulator circuit. Background technique [0002] Common power control techniques used for step-down switching regulator circuits include pulse width modulation (PWM), fixed off time control, and constant on time control (constant on time, COT). [0003] In the COT control mode, the switching regulator circuit may not need a loop compensation network, which makes the circuit design easier. Moreover, since the switching regulator circuit that uses the COT mode for control does not need to use an error amplifier to adjust the voltage, the switch regulator circuit that uses the COT control mode has better transient response performance. In addition, if the switching regulator circuit is in the PFM mode under the light load state and in the PWM mode under the heavy load state, the COT...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/157
CPCH02M2001/0003H02M3/158H02M1/0003
Inventor 王锐张正伟
Owner CHENGDU MONOLITHIC POWER SYST