Phase compensation circuit, semiconductor integrated circuit having same, and power supply circuit
A technology of power supply and phase compensation, which is applied in the conversion device of output power, conversion of DC power input to DC power output, electrical components, etc., which can solve the problems of complex circuit structure and increased current consumption.
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no. 1 example ）
[0026] The following will refer to figure 1 , 2A and 2B describe the first embodiment of the present disclosure. figure 1 is a schematic circuit diagram of the power supply circuit 1 that performs feedback control to regulate the output voltage to a constant target value. For example, the power supply circuit 1 is a series regulator power supply circuit.
[0027] The power supply circuit 1 includes a main transistor T1 , a reference voltage generation circuit 2 , a voltage detection circuit 3 , an error amplifier 4 , and a phase compensation circuit 5 . For example, the power supply circuit 1 may be configured as a semiconductor integrated circuit (IC). That is, component elements of the power supply circuit 1 may be integrated into a semiconductor integrated circuit. As another example, constituent elements of the power supply circuit 1 other than the main transistor T1 may be integrated into a semiconductor integrated circuit.
[0028] The power supply circuit 1 is supp...
no. 2 example ）
[0051] will refer to image 3 A second embodiment of the present disclosure is described. In the power supply circuit 21 of the second embodiment, the coupling position of the phase compensation capacitor C2 is different from that of the phase compensation capacitor C2 of the first embodiment. Hereinafter, similar components are marked with similar reference numerals, and descriptions thereof will not be repeated. Points different from the first embodiment will be mainly described.
[0052] image 3 is a schematic circuit diagram of the power supply circuit 21 of the second embodiment. image 3 In , the parasitic capacitance C3 accompanying the phase compensation capacitor C2 and the smoothing capacitor C1 arranged outside the power supply circuit 21 are not illustrated.
[0053] The power supply circuit 21 consists of a figure 1 Error amplifier 4 shown in is similar to error amplifier 22 . image 3 In , the amplifier circuit 23 constituting the output stage of the error...
no. 3 example ）
[0060] will refer to Figure 4 A third embodiment of the present disclosure is described. The power supply circuit 31 of the third embodiment has a main transistor T31 different from the main transistor T1 of the first embodiment. Hereinafter, points different from the first embodiment will be mainly described.
[0061] Figure 4 In , the parasitic capacitance C3 accompanying the phase compensation capacitor C2 and the smoothing capacitor C1 arranged outside the power supply circuit 31 are not illustrated.
[0062] Such as Figure 4As shown in , the power supply circuit 31 is an NMOS output type series regulator power supply circuit. That is, the main transistor T31 is an N-channel power MOSFET. The drain of the main transistor T31 is coupled to the power supply line 7 . The source of the main transistor T31 is coupled to the power supply output terminal P3.
[0063] A reference voltage Vref is applied to a non-inverting input terminal of the error amplifier 4 . The de...
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