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线性稳压 [2016/06/02 13:48] admin [Variable regulators] |
线性稳压 [2016/06/02 13:49] admin [Using a linear regulator] |
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| For output voltages not provided by standard fixed regulators and load currents of less than 7 A, commonly available adjustable three-terminal linear regulators may be used. The LM317 series (+1.25V) regulates positive voltages while the LM337 series (−1.25V) regulates negative voltages. The adjustment is performed by constructing a potential divider with its ends between the regulator output and ground, and its centre-tap connected to the 'adjust' terminal of the regulator. The ratio of resistances determines the output voltage using the same feedback mechanisms described earlier. | For output voltages not provided by standard fixed regulators and load currents of less than 7 A, commonly available adjustable three-terminal linear regulators may be used. The LM317 series (+1.25V) regulates positive voltages while the LM337 series (−1.25V) regulates negative voltages. The adjustment is performed by constructing a potential divider with its ends between the regulator output and ground, and its centre-tap connected to the 'adjust' terminal of the regulator. The ratio of resistances determines the output voltage using the same feedback mechanisms described earlier. | ||
| - | ====Protection==== | + | ====保护==== |
| Linear IC voltage regulators may include a variety of protection methods: | Linear IC voltage regulators may include a variety of protection methods: | ||
| * Current limiting such as constant-current limiting or foldback | * Current limiting such as constant-current limiting or foldback | ||
| 行 62: | 行 62: | ||
| Sometimes external protection is used, such as crowbar protection. | Sometimes external protection is used, such as crowbar protection. | ||
| - | ====Using a linear regulator==== | + | ====线性稳压器的使用==== |
| Linear regulators can be constructed using discrete components but are usually encountered in integrated circuit forms. The most common linear regulators are three-terminal integrated circuits in the TO-220 package. | Linear regulators can be constructed using discrete components but are usually encountered in integrated circuit forms. The most common linear regulators are three-terminal integrated circuits in the TO-220 package. | ||