凌志is 250 锐志2．5V 相同与差异 谁知道？

我来！累死我了~~~z
2. What is the meaning of “Thermal resistance between junction and case ” ? Larger is better or smaller is better?
翻译：请问核心与表面之间的热阻的意义，大还是小好？
答案：TR（Thermal Resistance）＝（表面最高温度－环境温度）/ TDP(最大散热功率)
或者Trise=θja*Ptotal power loss
Trise-芯片的温度升高值
θja -热阻
Ptotal power loss-输入的发热功率
当然小了好。

3. What is the definition of “Efficiency of a power conversion system “ ? How to measure?
翻译：请问电源转换系统效率的定义，怎样去测量？
答案：Vout*Iout/Vin/(Iin-Ileak)

4. Please arrange the following packages base on size. From biggest to smallest. The packages are SOT-23, TO-220, Dpak.
翻译：请按从大到小的顺序排列以下的封装，SOT-23，TO-220,Dpak。
答案：尺寸 单位:mm 都属于功率MOSFET的封装形式，该题应该是做Power的该知道的
长 宽 高(厚) 备注
SOT-23 3.0 1.4 1.1 SMT
TO-220 15.8 10.3 4.5 DIP，带金属散热
Dpak 6.22 6.73 2.38 散热很好

5. What are the important parameters of an inductor? Please state at least 2.
翻译：电感最重要的参数