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lm317 [2016/06/02 20:02] gongyu |
lm317 [2016/06/02 21:22] (当前版本) gongyu |
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| ====规格==== | ====规格==== | ||
| - | cvb Part pinout of LM317T showing its constant voltage reference. Package is TO-220. | ||
| - | |||
| ^符号 |参数 |值 |单位 | | ^符号 |参数 |值 |单位 | | ||
| ^Vout |1.25 |– 37 |V | ^Vout |1.25 |– 37 |V | ||
| 行 12: | 行 10: | ||
| ^IO(MAX) |最大输出电流 |1.5 |A| | ^IO(MAX) |最大输出电流 |1.5 |A| | ||
| ^IL(MIN) |最小负载电流 |3.5 mA typical, 12 mA maximum || | ^IL(MIN) |最小负载电流 |3.5 mA typical, 12 mA maximum || | ||
| - | ^PD |Power dissipation |Internally Limited |W [1]| | + | ^PD |功率消耗 |内部限制 |W [1]| |
| - | ^RθJA |Thermal resistance, Junction to ambient |80 |°C/W | | + | ^RθJA |结到环境热阻 |80 |°C/W | |
| - | ^RθJC |Thermal resistance, Junction to case |5 |°C/W | | + | ^RθJC |结壳热阻 |5 |°C/W | |
| Without a heat sink with an ambient temperature at 50 ⁰C such as on a hot summer day inside a box, a maximum power dissipation of (TJ-TA)/RθJA = ((125-50)/80) = 0.98 W can be permitted. (A piece of shiny sheet metal of Aluminum with the dimensions 6 x 6 cm and 1.5 mm thick, results in a thermal resistance that permits 4.7 W of heat dissipation[2][3]). | Without a heat sink with an ambient temperature at 50 ⁰C such as on a hot summer day inside a box, a maximum power dissipation of (TJ-TA)/RθJA = ((125-50)/80) = 0.98 W can be permitted. (A piece of shiny sheet metal of Aluminum with the dimensions 6 x 6 cm and 1.5 mm thick, results in a thermal resistance that permits 4.7 W of heat dissipation[2][3]). | ||