1.AC/DC the use of power supply
Schematic diagram of the use of low-dropout linear regulators in AC/DC power supplies. In this circuit, the communication power is step-down through the power transformer to obtain the communication low voltage, and then through the rectifier filter circuit to obtain the unstable DC voltage, and then through the low dropout linear regulator (LDO) to obtain a stable DC power supply, and through the low dropout linear regulator to eliminate the communication sound in the power supply circuit, press the ripple voltage.
2. The application of battery or accumulator power supply circuit
The power supply voltage of the battery or battery will change within a certain range, the battery or battery will be added with the use time, its output voltage will decrease, after adding a low dropout linear regulator to the circuit, the DC operation can not only be stable, but also when the battery or battery is close to the end of discharge, the DC output voltage is kept stable, and the service life of the battery or battery is added.
3. The application in switching power supply circuits
Schematic diagram of the use of low-dropout linear regulators in switching power supply circuits. When the input DC voltage is much higher than the required DC operating voltage, a switching power supply circuit can be added before the low dropout linear regulator circuit.
As we all know, the switching power supply has its common advantages, such as the power is very high, the input voltage and the output voltage can be very different, etc., but it also has many disadvantages, especially when used in analog circuits, its shortcomings are more significant, such as high output ripple voltage, large noise, poor voltage regulation, etc.
The low-dropout linear regulator can achieve active filtering, remove interference, and greatly improve the voltage regulation accuracy while greatly improving the power supply system, in addition to the power supply system has not decreased significantly.
4. The use of multiple power supply circuits that block each other
Figure 2-53 shows a schematic diagram of the use of a low-dropout linear regulator (LDO) in a multiple, mutually blocked power supply circuit. In some uses, such as communication equipment, often by a power supply, but demand a plurality of groups of small power supplies, and require these small power supplies to block each other, that is, some small power supply operations in between, other small power supplies do not operate in order to save power demand shutdown, then can select a plurality of low-dropout linear regulator circuits, through the low-dropout linear regulator integrated circuit (5-pin integrated circuit) in the control end to carry out the on-off control of the integrated circuit.
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