Voltage-mode switching DC-DC converter with on-chip frequency compensation

A DC-DC, voltage mode technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problems of magnification influence, multiplication magnification limited, inconvenient integration, etc., to ensure The effect of improving output voltage accuracy and reducing system offset
CN106059293AActive Publication Date: 2016-10-26CHENGDU SINO MICROELECTRONICS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHENGDU SINO MICROELECTRONICS TECH CO LTD
Publication Date
2016-10-26

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Abstract

The invention discloses a voltage-mode switching DC-DC converter with on-chip frequency compensation, and relates to the field of analog integrated circuits. The voltage-mode switching DC-DC converter comprises an error amplifier, a PWM comparator, an oscillator, a logic control module and a power tube, wherein the power tube is provided with a VIN input end used for inputting variable DC voltage VIN. The voltage-mode switching DC-DC converter is characterized by further comprises a feedforward compensation module, wherein an output end of the feedforward compensation module is connected to a negative input end of the error amplifier, the output end of the feedforward compensation module is further grounded through a second resistor Rf2, the output end of the feedforward compensation module is further connected to an output end of the error amplifier through a third resistor Rf3, and the output end of the feedforward compensation module is connected to output voltage Vsense through a first resistor Rf1. The voltage-mode switching DC-DC converter realizes on-chip full integration of compensation components under the condition of ensuring the loop stability, so that the area of a PCB is saved, and the application cost is reduced.
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Description

technical field

[0001] The invention relates to the field of analog integrated circuits, in particular to a voltage-mode switching DC-DC converter with an on-chip frequency compensation structure. Background technique

[0002] The switching DC-DC converter is an important part of the power management circuit, which is used to convert the variable input DC voltage into a fixed output DC voltage. Compared with the LDO voltage regulator, the switching DC-DC converter has high efficiency High advantages, it is one of the preferred power supply systems for portable products.

[0003] The structure diagram of the traditional voltage-mode switching DC-DC converter is as follows: figure 1 As shown, it is composed of reference voltage, oscillator, error amplifier, sampling resistor, PWM comparator, logic control, power transistor, external compensation network and LC filter network, and the output voltage is fed back to the error amplifier after being divided by the sampling resisto...

Claims

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