Dc-dc converter and switching control circuit
A technology for switching control circuits and switching elements, which is applied in the direction of control/regulation systems, output power conversion devices, instruments, etc., and can solve problems such as adverse effects, changes, and noise generation of other circuits, so as to improve high-speed load response and reduce noise effect
Inactive Publication Date: 2010-08-18
MITSUMI ELECTRIC CO LTD
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Problems solved by technology
As a result, this control method does not require the use of an error amplifier that operates as an integrating circuit, so the response to load changes is excellent, and it also has the advantage of a simple circuit structure. However, since the switching frequency is determined by the delay of the circuit, the switching frequency Will change with the change of load current
Therefore, it can be seen that there is the following problem: when the switching frequency drops to the audio frequency band, audible noise is generated. On the other hand, when the switching frequency rises to the high frequency region, it becomes the cause of common mode noise (common mode noise) and causes the same noise. adverse effects on other circuits in the substrate
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[0035] Next, preferred embodiments of the present invention will be described with reference to the drawings.
[0036] figure 1 One embodiment of the DC-DC converter using the switching regulator method of the present invention is shown.
[0037] The DC-DC converter of this embodiment includes: a coil L1 as an inductor; and a driving switching transistor M1 composed of a P-channel MOSFET (insulated gate field-effect transistor) connected to a circuit to which a DC input voltage is applied. Between the voltage input terminal IN of Vin and one terminal of the above-mentioned coil L1, a drive current is used to flow into the coil L1; and a switching transistor M1 for rectification composed of an N-channel MOSFET connected to one of the coil L1 between terminal and ground.
[0038] In addition, the DC-DC converter includes: a switch control circuit 20 for driving the switching transistors M1 and M2 to be turned on (ON) and off (OFF); Smoothing capacitor C1 between ground point...
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A switching control circuit for controlling on / off of a switching element for driving an inductor for voltage conversion, the switching control circuit including: a voltage comparator for determining whether an output voltage of the inductor is in a first state where the output voltage is equal to or higher than a predetermined electric potential or in a second state where the output voltage is lower than the predetermined electric potential; a timing determination unit for determining an on-timing to turn on the switching element based on a clock signal having a predetermined frequency even when the output voltage is in the first state; and a drive control circuit for generating a driving signal to turn on or turn off the switching element based on an output signal of the timing determination unit.
Description
technical field [0001] The present invention relates to a switch-regulator type DC-DC converter (converter) and its switch control circuit for converting DC voltage, and particularly to an effective method for improving load response characteristics applied to a DC-DC converter. technology. Background technique [0002] In recent years, the lower voltage and higher current of semiconductor integrated circuits (ICs) such as CPUs have progressed, and the fluctuation of load current has also become more frequent. Therefore, high-speed load response has come to be required as a characteristic of a DC-DC converter that supplies a DC power supply voltage to a system using such an IC. In addition, as a power supply device that supplies a DC power supply voltage to a system using an IC, a switching regulator type DC-DC converter is often used. [0003] Conventionally, DC-DC converters of the switching and regulator type, such as Figure 4 As shown, there is a DC-DC converter that ...
Claims
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IPC IPC(8): H02M3/155
CPCH02M3/156
Inventor 永井富幸高桥佳周
Owner MITSUMI ELECTRIC CO LTD