What is a Linear Regulated PSU?
Linear regulated power supply is a class of DC regulated power supply used earlier. According to the working state of the adjustment tube, we often divide the regulated power supply into two categories: linear regulated power supply and switching regulated power supply. Linear regulated DC power supply is characterized by: the output voltage than the input voltage is low; fast response time, the output ripple is small; low noise generated by the work; low efficiency (now often look at the LDO is to solve the problem of efficiency and the emergence of); heat (especially high-power power supply), indirectly to the system to increase the thermal noise.
According to the operating state of the regulator tube, we often divide the regulated power supply into two categories: linear regulated power supply and switching regulated power supply. In addition, there is a small power supply that uses a voltage regulator. The linear regulated power supply here refers to the DC regulated power supply in which the regulator tube operates in a linear state. A regulator operating in a linear state can be understood in this way: RW (see analysis below) is continuously variable, i.e. linear.
In the switching power supply is not the same, the switching tube (in the switching power supply, we generally call the adjustment tube switching tube) is working in the on and off two states: on - resistance is very small; off - resistance is very large. Working in the switching state of the tube is obviously not a linear state. Linear regulated power supply is a relatively early use of a class of DC regulated power supply.
Linear regulated power supply features
1, lower efficiency;
2, low noise generated by the work;
3, fast response speed, smaller output ripple;
4, the output voltage is lower than the input voltage;
5, large heat generation (especially high-power power supply), indirectly adding thermal noise to the system.
What are the advantages and disadvantages of linear regulated power supply
Advantages
The output voltage is of high quality, low ripple, and does not require the use of inductive components;
Disadvantages
The conversion efficiency is low, especially if the difference between the input and output voltages is large. If the output current is also large, there will be obvious heating and burning phenomenon, and may even burn out the regulator.
