Delixi low dropout linear regulator type

Create Date: 2024-8-30 12:03:23|Source: Delixi

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 alternating current is stepped-down by the power transformer to obtain the AC low voltage, and then the unstable DC voltage is obtained through the rectifier filter circuit, and then the stable DC power supply is obtained through the low-dropout linear regulator (LDO), and the AC sound in the power supply circuit is eliminated through the low-dropout linear regulator, and the ripple voltage is suppressed.

Delixi low dropout linear regulator type

Delixi low dropout linear regulator type

2. The application of battery or accumulator power supply circuit

The power supply voltage of the battery or accumulator will change within a certain range, the output voltage of the battery or accumulator will decrease with the increase of use time, after adding a low dropout linear regulator in the circuit, the DC work can not only be stable, but also when the battery or accumulator is close to the end of discharge, the DC output voltage remains stable, which increases the service life of the battery or accumulator.

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 unique advantages, such as high efficiency, 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 obvious, such as high output ripple voltage, large noise, poor voltage regulation, etc.

The low-dropout linear regulator can realize active filtering, remove interference, and greatly improve the accuracy of voltage regulation, in addition to the efficiency of the power supply system, there is no significant decrease in the efficiency of the power supply system.

4. The application of multiple mutually isolated power supply circuits

Low-dropout linear regulator (LDO) in some applications of multi-channel mutually isolated power supply circuits, such as communication equipment, is often powered by a power supply, but needs a plurality of small power supplies, and requires these small power supplies to isolate each other, that is, some of the small power supplies work, and other small power supplies need to be turned off in order to save power when they are not working, then a plurality of low-dropout linear regulator circuits can be used to carry out on-off and on-off control of the integrated circuit through the control terminal of the low-dropout linear regulator integrated circuit (5-pin integrated circuit).

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