The circuit principle and application of the three-terminal integrated linear regulator, 1. Three-terminal fixed integrated voltage regulator If the aforementioned series-type power supply circuit is all integrated in a silicon chip, the three-terminal pin is extracted after being packaged.
1. Three-terminal fixed integrated voltage regulatorIf the aforementioned series regulated power supply circuits are all integrated on a silicon chip, and the three-terminal pins are taken out after packaging, it becomes a three-terminal integrated regulated power supply.
Positive voltage output of 78 & TImes; & TImes; series, negative voltage output of 79 & TImes; & TImes; series. Where ×× represents the value of the fixed voltage output. Such as: 7805, 7806, 7809, 7812, 7815, 7818, 7824, etc., refers to the output voltage is +5V, +6V, +9V, +12V, +15V, +18V, +24V. The 79×× series also corresponds to it, except that it is a negative voltage output. The maximum output current of this type of regulator is 1.5A, the maximum power consumption of the plastic package (TO-220) is 10W (plus heat sink); the shape of the metal case (TO-3), the maximum power consumption is 20W (plus heat sink ).
2. Internal circuit diagram of 78 series three-terminal integrated voltage regulator
(1) Fixed output connection
In use must pay attention to: (VI) and (Vo) the relationship between the W7805, for example, the fixed output voltage of the three-terminal regulator is 5V, and the input voltage is at least greater than 8V, so there is between the input / output 3V pressure difference. Make the adjustment tube work in the enlarged area. However, when the differential pressure is large, the power consumption of the integrated block is increased. Therefore, the both should be taken into account, that is, both the adjustment of the tube and the saturation of the power consumption at the maximum load current are not ensured.
(2) Fixed dual output connection
(3) Increase output current connection
The diode D is set with a low dropout VBE voltage drop, and the expanded output current is: The original output current is Io, which can now be approximately enlarged by a factor of three.
7824 is a 24V three-terminal regulator integrated circuit, with a multimeter can only roughly measure its quality. Like the plastic transistor, the 7824 has three pins. It faces the side with the word, and the pin faces downwards. The pins of the 7824 are inputs, ground and voltage regulator output from left to right. You can use a multimeter to measure the resistance between the pins to determine whether it is good or bad. It is best to find a good 7824 contrast measurement. Refer to the following figure for detection.
Such as
Use a multimeter Rx1 file red table pen to connect the middle foot, the black table pen to the other two feet, the hands should not move. If the hands are deflected, 7824 is broken. Then the black pen is connected to the middle leg, and the red pen is connected to the other two feet. The hands should deflect 1/3 or 1/2 of the dial scale. If the hands are not deflected or full, 7824 is broken.
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