Control circuit and method for constant turn-on time transformation circuit

A constant on-time and conversion circuit technology, which is applied in the control/regulation system, DC power input conversion to DC power output, electrical components, etc., can solve the problems of unsuitable size and high price, and achieve good load response and improve performance effect

Active Publication Date: 2013-06-19
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in special applications such as notebook computers, traditional constant on-time DC conversion circuits cannot use small and cheap ceramic capacitors as output capacitors, but need to use relatively expensive polymer organic semiconductor solid capacitors (sp- cap)

Method used

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  • Control circuit and method for constant turn-on time transformation circuit
  • Control circuit and method for constant turn-on time transformation circuit
  • Control circuit and method for constant turn-on time transformation circuit

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Embodiment Construction

[0023] Such as image 3 Shown is a flowchart of an improved constant on-time DC conversion method according to the present invention. When the circuit starts to run, a feedback signal V FB And a compensation signal V slope The algebraic sum and a reference signal V R Compare. When the feedback signal V FB And compensation signal V slope The algebraic sum is greater than the reference signal V R 时, namely V FB +V slope >V R When the current switching state of the output stage of the circuit is maintained; when the feedback signal V FB And compensation signal V slope The algebraic sum of is less than the reference signal V REF 时, namely V FB +V slope R When the upper switch tube M of the output stage of the circuit 1 Open, down switch tube M 2 Turn off and set the compensation signal V slope Make it increase after clearing, the upper switch tube M 1 Maintained constant on-time T ON The conduction state of the time period. When T ON At the end, if V FB +V slope R , ...

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PUM

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Abstract

The present invention discloses a control circuit for constant on-time converter and a control method thereof. The proposed constant on-time DC / DC converter stabilizes the system and improves the performance of the load transient response without large equivalent series resistance of the output capacitor.

Description

Technical field [0001] The present invention relates to a DC conversion circuit. More specifically, the present invention relates to a constant on-time DC conversion circuit. Background technique [0002] The constant on-time DC conversion circuit has been well applied in the field of power conversion due to its superior load transient response, simple internal structure and smooth working mode switching. [0003] Such as figure 1 The circuit shown is a conventional constant on-time DC conversion circuit 50. Such as figure 1 As shown, a constant time timer U 1 Input V of receiving circuit 50 IN And the output V of circuit 50 OUT . Circuit 50 output V OUT At the same time through the resistance R 1 And resistance R 2 The formed feedback loop gets a feedback signal V FB , And is sent to the comparator U 2 The inverting input terminal; comparator U 2 The non-inverting input terminal receives the reference level V REF , Its output is connected to the AND gate U 4 One input termin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/00
CPCH02M3/156
Inventor 欧阳茜
Owner CHENGDU MONOLITHIC POWER SYST
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