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Switching regulator

A switching regulator, open state technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of output voltage ripple voltage, etc., achieve the effect of stabilizing the induced current and preventing switching operation

Inactive Publication Date: 2009-12-16
RICOH MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, in the pseudo-PFM mode disclosed in Reference 1, there will be a ripple voltage in the output voltage

Method used

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  • Switching regulator
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  • Switching regulator

Examples

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no. 1 example

[0037] figure 1 is a block diagram showing the switching regulator 100 according to the first embodiment of the present invention.

[0038] Such as figure 1 As shown, the switching regulator 100 is a step-down switching regulator that operates in a PWM control mode under normal workload conditions, or in a PFM control mode under low workload conditions. The switching regulator 100 includes a voltage divider 101, an error amplifier circuit 103, a ramp circuit 105, a multiplexer 106, a comparison circuit 107, an oscillation circuit 108, a logic circuit 109, a PWM / PFM switching circuit 110, a switching transistor 111, an inductor device 112, output capacitor 113 and rectifier diode 115.

[0039] In the switching regulator 100 , when the switching transistor 111 is turned on, an output voltage Vo is output from the output terminal, and energy corresponding to a difference between the input voltage and the output voltage is stored in the inductor 112 . When the switching transis...

no. 2 example

[0113] Figure 4 is a block diagram showing a switching regulator 200 according to a second embodiment of the present invention.

[0114] exist Figure 4 The switching regulator 200 shown in the figure 1 The switching regulator 100 shown in is different in that it is also provided with a delay circuit 210 .

[0115] In the following description, the same reference numerals are used to denote the same elements as previously described, and repeated descriptions are omitted.

[0116] The delay circuit 210 is described below.

[0117] The delay circuit 210 is provided between the logic circuit 109 and the PWM / PFM switching circuit 110, and operates when the operation mode is switched from the PWM control mode to the PFM control mode or from the PFM control mode to the PWM control mode.

[0118] The delay circuit 210 includes an inverter circuit 211 , a NOR circuit 212 , a NAND (NAND) circuit 213 , and counters 214 , 215 .

[0119] The NOR circuit 212 outputs the logical sum o...

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PUM

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Abstract

A switching regulator capable of operating with low power consumption and capable of preventing variations in output voltage is disclosed. The switching regulator operates in a PWM control mode and a PFM control mode, and includes: a switching unit; an error amplifier circuit for amplifying an error voltage between an output voltage and a first reference voltage, and a ramp circuit for generating a ramp signal ; The reference voltage generation circuit generates a second reference voltage for determining the on-state time interval in the PFM control mode; a multiplexer outputs one of the second reference voltage and the output voltage from the error amplifier circuit; the comparison circuit, comparing the output voltage from the ramp circuit with the output voltage from the multiplexer; and an oscillation circuit for determining timing of an on state in a PWM control mode.

Description

technical field [0001] The present invention relates to a switching regulator with lower power consumption and capable of operating efficiently under lower workload conditions. Background technique [0002] In the prior art, it is generally known to set a switching regulator to operate in PWM (Pulse Width Modulation) control mode under normal workload conditions and to set it to operate in PFM (Pulse Frequency Modulation) control mode under low workload conditions. modulation) control mode work. [0003] In PWM control mode, the switching regulator is set to work at a fixed frequency, and the ON-duty of each cycle is modulated to adjust the output voltage. In PFM control mode, the duty ratio on portion (time interval in ON state) in each cycle is fixed, but the operating frequency is modulated to adjust the output voltage. In addition, there is a pseudo PFM control mode in which the turn-on timing is controlled to a fixed frequency and skipped, thereby achieving performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
CPCH02M3/156
Inventor 相马将太郎
Owner RICOH MICROELECTRONICS CO LTD