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Switching regulator

A technology of switching regulators and comparators, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., and can solve problems such as incapable of IC

Inactive Publication Date: 2007-12-05
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In the former soft-start circuit using a CR time constant circuit, as described in the prior art of Patent Document 1, the capacitor for the time constant becomes larger, and there is a problem that IC cannot be implemented.

Method used

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Embodiment

[0042] In switching regulator 1 of FIG. 1 , soft start circuit 2 is provided instead of soft start circuit 18 of FIG. 4 .

[0043] 130 is a PWM pulse generating circuit, which is composed of a soft start circuit 2, a PWM comparator 8, and a triangular wave generating circuit 13b.

[0044] The soft start circuit 2 generates a step voltage signal ST (refer to FIG. 3( a )), and the step voltage signal ST generates short-period and long-period step voltages. The soft start circuit 2 is composed of a PWM control start detection circuit 3, a 1 / n frequency division circuit 4, a selector 5, a counter 6, and a D / A conversion circuit (D / A) 7. The 1 / n frequency division circuit divides the clock CK by 4 and the clock CLK before frequency division. In FIG. 1, the driver 14 of FIG. 4 is deleted, but the driver 14 may also be provided.

[0045] The selector 5 controls the output of the start detection circuit 3 according to PWM, and switches the terminal selection from the output of the c...

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Abstract

To provide a switching regulator that needs, as a soft start circuit, no capacitor of a large time constant, exhibits a reduced variation in soft start time, also exhibits a shortened time in which a power supply voltage stabilization control starts, and that is suitable for circuit integration. [MEANS FOR SOLVING PROBLEMS] A step voltage signal is used to step raise or step lower the output voltage of a soft start circuit at a predetermined rate. The period in which the step voltage changes is established such that it is a predetermined period at a turn-on. A detecting circuit is used to monitor a PWM pulse output. The period in which the step voltage of the output signal of the soft start circuit changes is also established such that it is longer than the foregoing predetermined period in accordance with a timing at which the output changes from ''H'' to ''L'' or from ''L'' to ''H'' after the foregoing turn-on.

Description

technical field [0001] The present invention relates to a switching regulator (switching regulator), in particular to a DC / DC converter using a switching regulator, which is adapted to eliminate the need for a capacitor for obtaining a large time constant provided as a soft start circuit, and can reduce the This is an IC-based switching regulator that reduces the variation in soft-start time and shortens the time until power supply voltage stabilization control starts. Background technique [0002] Conventionally, in portable audio equipment, personal computers, PHS, mobile phones, and portable electronic equipment, in order to obtain efficiently converted power supply voltages, power supply circuits using DC / DC converters using switching regulators have been used. [0003] FIG. 4 is an explanatory diagram of an example of the DC / DC converter (switching regulator). [0004] 10 is a switching regulator, 11 is its error amplifier, 12 is a reference voltage generating circuit,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M1/36H02M3/157Y10S323/901
Inventor 冈本成弘山伦章
Owner ROHM CO LTD
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