Important features of CMOS linear regulators
This second series as a series will explain the electrical characteristics of the linear regulator. Here, basic performances such as output voltage accuracy, current consumption, input stability, load stability, input/output voltage difference, and output voltage temperature characteristics are listed. These are the essential characteristics of the regulator series. For CMOS linear regulators, there are no negligible items compared to bipolar linear regulators.
The basic characteristics of the linear regulator
Table 3 shows the general electrical characteristics of the CMOS regulator.
Ripple suppression
Although CMOS linear regulators vary widely by application, they can be roughly divided into those that emphasize low current consumption and high-speed LDOs that emphasize transient response. Since these differences differ depending on changes in the input voltage or output current, it is difficult to express only using the general DC characteristics. Therefore, recently, in order to represent the basic characteristics of the CMOS linear regulator, it also includes a ripple rejection ratio. Use the following formula to illustrate the ripple rejection rate
Ripple rejection rate = 20 × Log (input voltage change / output voltage change)
Figure 5 shows the ripple suppression feature of the high-speed regulator XC6223 series. In addition, the actual waveform is shown in FIG. When the peak-to-peak value of the input voltage is represented by a sine wave at 1V, the ripple characteristic of the output voltage at the time of changing the frequency can be read out.
Figure 5 Ripple Rejection Rate Characteristics (XC6223)
Figure 6 Ripple Rejection Rate: Actual Input Voltage and Output Voltage Waveform (IOUT=30mA)
According to Fig. 5, the ripple rejection rate at the frequency of 1kHz is 78dB, which corresponds to the input voltage change of 1V, and the output voltage variation is about 0.1mV. Although the result cannot be confirmed by the oscilloscope of Fig. 6, From the oscilloscope can confirm that when the frequency is 100kHz, the ripple suppression rate is about 40dB, and the output ripple voltage is about several mV.
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