Amlifying circuit and power apparatus with the same
A technology of amplifying circuit and power supply device, applied in differential amplifiers, DC-coupled DC amplifiers, adjusting electrical variables, etc., can solve the problems of output response deterioration and voltage increase, and achieve the effect of preventing output oscillation and improving load response characteristics.
Inactive Publication Date: 2004-05-05
SHARP KK
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Problems solved by technology
It is hoped that this instantaneous output voltage drop will be equal to about 3% 0.1V of the rated output voltage when the rated output voltage is 3.3V. However, due to the deterioration of the output response of the existing DC stable voltage, the voltage drop has to be increased.
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Embodiment Construction
[0039] according to Figure 1 to Figure 5 An embodiment of the present invention is explained as follows.
[0040] figure 1 It is a circuit diagram showing the configuration of a first DC stabilized power supply device (hereinafter referred to as a power supply device) according to this embodiment.
[0041] The power supply device has a drive circuit 1, a reference voltage source 2, an error amplifier 3, an output transistor Q0, voltage dividing resistors RA and RB, and an output capacitor Co.
[0042] The PNP transistor Q0 as an output control transistor has its base connected to the drive output terminal of the drive circuit 1, while the emitter is connected to the input terminal PIN, and the collector is connected to the output terminal POUT. The voltage Vi is input to the input terminal PIN, and the output voltage Vo is output from the output terminal POUT.
[0043] Between the output terminal POUT and the ground terminal GND, voltage dividing resistors RA and RB and an outpu...
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An amplifier circuit includes first and second resistors that are serially connected to each other between bases of first and second transistors that flow the same current as that in a differential transistor pair made up of two transistors. A capacitor is provided between a junction of the first and second resistors and the collector of the first transistor on the output side. The amplifier circuit has a gain whose frequency characteristic is determined by a low-pass filter realized by the second resistor and capacitor connected to the second transistor. The frequency characteristic lowers a gain of the frequency that causes output oscillation, thereby preventing output oscillation. The two resistors divide a resistance between the bases of the sub transistors, so as to reduce a resistance of the second resistor. As a result, the effect of phase compensation becomes weaker and the load response characteristic of the power supply improves. This enables the DC regulated power supply, even if it is of an intermediate current type which produces an output current of about 500 mA, to prevent output oscillation without reducing the load response characteristic, even when a chip-stacked ceramic capacitor is used as the output capacitor.
Description
Invention field [0001] The present invention relates to an amplifier circuit used as an error amplifier of a DC stabilized power supply circuit and the like, and a power supply device having the circuit. Background of the invention [0002] Figure 6 shows the equivalent circuit of a conventional DC stabilized power supply device. [0003] This power supply device outputs an input voltage Vi as an output voltage Vo through a PNP-type output transistor Q10, and supplies a current Io corresponding to the base current flowing from the output transistor Q10 into the drive circuit 11 to the load RL. After the output voltage is divided by a voltage divider circuit composed of series resistors RA and RB, it is input to the error amplifier 12 as a feedback voltage Vadj. The error amplifier 12 also inputs a constant reference voltage Vref generated by the reference voltage source 13. The error amplifier 12 amplifies the difference between the feedback voltage Vadj and the reference voltage...
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IPC IPC(8): G05F1/56G05F1/575H03F3/45
CPCG05F1/575
Inventor 花房孝一勘崎廷夫
Owner SHARP KK