The integrated voltage stabilizer is also called the integrated voltage stabilizer circuit, which can eliminate high-frequency noise and self-excited oscillation, and convert the unstable DC voltage into a stable DC voltage integrated circuit. The stabilized power supply composed of discrete components has large output power. , The advantages of wider adaptability.
Integrated voltage stabilizers can be roughly divided into three-terminal fixed type, three-terminal adjustable type, multi-terminal adjustable type, and single-chip switch type according to the number of outlet terminals and usage conditions.
The three-terminal fixed integrated voltage regulator is a series regulated voltage regulator. It integrates all circuits in a single piece of silicon. The entire integrated voltage regulator has only input, output, and public three terminals, which is very convenient to use.
The three-terminal fixed integrated voltage regulator integrates sampling resistors, compensation capacitors, protection circuits, high-power adjustment tubes, etc. on the same chip, so that the entire integrated circuit block has only input, output, and public three terminals, which is very convenient to use, So it is widely used. Its disadvantage is that the output voltage is fixed, so a series of products with various output voltage and current specifications must be produced.
The three-terminal adjustable integrated voltage regulator only needs two external resistors to obtain various output voltages.
The multi-terminal adjustable type is an early integrated voltage stabilizer product. Its output power is small and there are many lead-out terminals. It is not convenient to use, but it has high precision and low price.
The working principle of the monolithic switch integrated regulated power supply is different from the above three types of regulators. It is a converter that converts DC to AC (high frequency) and then DC. Usually, there are two types of pulse width modulation and pulse frequency modulation, and the output voltage is adjustable. At present, it is widely used in equipment such as microcomputers, televisions, and measuring instruments.