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Characteristics and types of integrated stabilized voltage power supply

Characteristics and types of integrated stabilized voltage power supply
Today, jiuqi company will share with you some application knowledge of integrated voltage regulator. If you are interested, please do not miss it! Come and have a look!
The so-called integrated voltage stabilizer is an integrated circuit that converts unstable dc voltage into stable dc voltage. The voltage stabilizer composed of discrete components has the advantages of large output power and wide adaptability.
Integrated voltage regulators have the advantages of simple circuit, stable voltage, small fluctuation and small interference, so they have been widely used. Among them, the low power regulator is most commonly used in three - terminal series regulator. Integrated regulators are generally divided into two types: linear integrated regulators and switch integrated regulators. Linear integrated regulators are divided into low pressure differential integrated regulators and general differential integrated regulators. Switching integrated voltage regulators are divided into step-down integrated voltage regulators, step-up integrated voltage regulators and three-terminal integrated voltage regulators with the opposite polarity of input and output are commonly used to form a stabilized power supply adapter. Integrated voltage regulators commonly used in the circuit are mainly 78XX series, 79XX series, adjustable voltage regulators, precision voltage reference integrated voltage regulators. Sometimes the number 78 or 79 is followed by an M or L, such as 78 M12 or 79124, to distinguish the output current from the package form, etc. The voltage stabilizing circuit of plastic package has the advantages of easy installation and low price, so it is widely used. The 79 series has the same naming method and shape as the 78 series except that the output voltage is negative and the leading-out pin is different.

Characteristics and types of integrated voltage regulators
1) features of integrated voltage regulator
The so-called integrated voltage stabilizer is to use integrated circuit technology to make components in the stable circuit on a semiconductor chip or insulating substrate for integration. The internal structure of linear integrated voltage regulator is linear series voltage regulator. With the development of integrated circuit technology, especially lsi, the volume, mass and power consumption of electronic devices are becoming smaller and smaller.

Dc linear regulator power adapter

Power adapter technology
Compared with the voltage regulator circuit composed of separated components, the integrated voltage regulator is small in size, low in cost and easy to use. Its performance can meet the requirements under general conditions, so it is widely used:
2) several common types of integrated voltage regulators
Generally, it can be divided into two types: linear integrated regulators and switch integrated regulators. Linear integrated regulators can be divided into low pressure differential integrated regulators and general differential integrated regulators. Switch integrated regulators are divided into step-down integrated regulators, step-up integrated regulators and input and output integrated regulators with opposite polarity.
(1) multi-terminal adjustable integrated voltage regulator. The components of the voltage regulator and protection circuit need external connection. It has more external terminals, which are convenient for different USES. Its output voltage can be adjusted to meet the requirements of different output voltage. At present, the domestic products are WB712, WB724, wa705-724, 5 C11, SG14, W601, W611 and so on.
(2) three-terminal fixed integrated voltage regulator. This type of voltage regulator integrates sampling resistance, compensation capacitance, protection circuit, high-power adjustment tube and so on in the same chip, so that the whole integrated circuit block only has input, output and three common leads, which is very convenient to use, so it is widely used. Its disadvantage is that the output voltage is fixed, so it is necessary to produce a variety of output voltage, current specifications of the series of products. The 7800 series integrated voltage regulators are commonly used to fix the positive output voltage, while the 7900 series integrated voltage regulators are commonly used to fix the negative output voltage.
(3) three-terminal adjustable integrated voltage regulator. It has three terminals: input, output and adjustment. Only two external resistors are needed to obtain various output voltages. For example, CW117 is commonly used three-terminal adjustable positive output integrated voltage regulator, CW137 is commonly used three-terminal adjustable negative output integrated voltage regulator.
(4) simultaneously output positive and negative integrated voltage regulators
For example, the operational amplifier needs to supply positive voltage and negative voltage at the same time. Usually, a positive voltage regulator and a negative voltage regulator are respectively used to form a power adapter that can output positive and negative voltage, or an integrated voltage regulator that can output positive and negative voltage is used to form a power adapter, such as MC1568. Shape and pin arrangement of CW78HOO (SA) CW79HOO (5A) fixed output integrated voltage regulator.
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previous :next:Power adapter features