差别

这里会显示出您选择的修订版和当前版本之间的差别。

到此差别页面的链接

两侧同时换到之前的修订记录 前一修订版
后一修订版 		前一修订版
lm317 [2016/06/02 14:55]
admin [Voltage regulator] 		lm317 [2016/06/02 21:22] (当前版本)
gongyu
行 4: 行 4:
  
 ====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 ​  |
- +
-^Symbol |Parameter |Value |Unit   |+
 ^Vout |1.25 ​  |– 37 |V ^Vout |1.25 ​  |– 37 |V
-^Vin            |– Vout |difference |3  – 40 V +^Vin            |– Vout |差别 |3  – 40 V 
-^TJ |Operating junction temperature range |0 – 125 |°C | +^TJ |工作结温范围 |0 – 125 |°C | 
-^IO(MAX) |Maximum output current |1.5 |A| +^IO(MAX) |最大输出电流 |1.5 |A| 
-^IL(MIN) |Minimum load current |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]).
行 25: 行 23:
 <WRAP centeralign>​ LM317内部功能框图 </​WRAP>​ <WRAP centeralign>​ LM317内部功能框图 </​WRAP>​
  
-====Operation====+====工作====
 {{ :​lm317_front.png |}} {{ :​lm317_front.png |}}