Constant voltage output circuit
An output circuit, constant voltage technology, applied in the field of constant voltage output circuit, can solve problems such as performance degradation of power management devices, achieve low ripple, high efficiency, and achieve the effect of stable output
Inactive Publication Date: 2013-08-21
海宁市盐官工业投资有限公司
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Problems solved by technology
[0008] The purpose of the present invention is to at least solve one of the above-mentioned technical defects, especially solve the defect that the performance of the power management device is reduced due to the load changing at any time
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[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0025] The constant voltage output circuit proposed by the present invention is different from the traditional switch control mode of pulse width modulation (PWM) or pulse frequency modulation (PFM), and also different from the linear control mode of LDO. The invention adopts a new type of pulse height control mode, through the power switch tube, error amplifier (EA), comparator (COMP), OSC and its peripheral devices, it can automatically switch between the switch control mode and the linear control mode, which can realize large High eff...
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The present invention provides a constant voltage output circuit, comprising a mode output module and an output module, wherein the mode output module is used for selecting the output module to enter a linear control mode or a switch control mode according to an output voltage sample; the output module is used for entering the linear control mode or the switch control mode according to instructions of the mode output module; in the linear control mode, a grid electrode of a power switch tube in the output module is controlled to output a stable current; in the switch control mode, the power switch tube of the output module is controlled to be in an on state and an off state alternatively, and an output voltage is adjusted by a signal height input by the grid electrode of the power switch tube. In the present invention, a peak value and a valley value of the output current are determined via changing the level value of a driving voltage, so that the stable output of the circuit is realized; and simultaneously, a DCDC mode ensured high efficiency under a heavy load and low ripple under a light load are realized by the switch control mode and the linear control mode.
Description
technical field [0001] The invention relates to the technical field of circuit design and manufacture, in particular to a constant voltage output circuit. Background technique [0002] The voltage regulators in current portable power management IC products are mainly LDO (Low Dropout Regulator, low dropout linear regulator) and non-isolated DCDC (DC to DC). Among them, LDO can only be used for step-down. The advantages are small ripple, few peripheral components, and low cost, but it generates a lot of heat and low efficiency, especially in the case of large voltage drop and high current, so it is generally used in output current Within 300mA, it can be used up to about 500mA. Non-isolated DCDC can realize step-up, step-down and buck-boost, but requires external magnetic components such as inductors, so the application circuit is relatively complicated. Because it is a switch control mode, the ripple is large. The biggest advantage is high efficiency and can be adapted to ...
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IPC IPC(8): H02M3/16H02M3/10
Inventor 贾增元张亮
Owner 海宁市盐官工业投资有限公司