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线性稳压 [2016/06/02 13:48] admin [Fixed regulators] |
线性稳压 [2016/06/02 13:48] admin [Adjusting fixed regulators] |
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| The "78xx" series (7805, 7812, etc.) regulate positive voltages while the "79xx" series (7905, 7912, etc.) regulate negative voltages. Often, the last two digits of the device number are the output voltage (e.g., a 7805 is a +5 V regulator, while a 7915 is a −15 V regulator). There are variants on the 78xx series ICs, such as 78L and 78S, some of which can supply up to 2 Amps.[2] | The "78xx" series (7805, 7812, etc.) regulate positive voltages while the "79xx" series (7905, 7912, etc.) regulate negative voltages. Often, the last two digits of the device number are the output voltage (e.g., a 7805 is a +5 V regulator, while a 7915 is a −15 V regulator). There are variants on the 78xx series ICs, such as 78L and 78S, some of which can supply up to 2 Amps.[2] | ||
| - | ====Adjusting fixed regulators==== | + | ====可调输出固定电压稳压==== |
| By adding another circuit element to a fixed voltage IC regulator, it is possible to adjust the output voltage. Two example methods are: | By adding another circuit element to a fixed voltage IC regulator, it is possible to adjust the output voltage. Two example methods are: | ||
| * A Zener diode or resistor may be added between the IC's ground terminal and ground. Resistors are acceptable where ground current is constant, but are ill-suited to regulators with varying ground current. By switching in different Zener diodes, diodes or resistors, the output voltage can be adjusted in a step-wise fashion. | * A Zener diode or resistor may be added between the IC's ground terminal and ground. Resistors are acceptable where ground current is constant, but are ill-suited to regulators with varying ground current. By switching in different Zener diodes, diodes or resistors, the output voltage can be adjusted in a step-wise fashion. | ||