This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

关于TIDA-01226参考原理图的疑问(4)

Other Parts Discussed in Thread: TIDA-01226

您好!

在TIDA-01226参考设计的bom表中,

U62采用LM2940IMP-5,描述为IC REG LDO 5V 1A SOT223。

我基于datasheet中的规格计算了一下,电流规格似乎远达不到1A,

即使不考虑温升,也仅有0.249A左右,似乎不足以驱动后端电路。

计算所用参数如下:

LM2940IMP-5.0

Vin=12V

Vout=5V

Ta=25℃(未考虑产品温升)

Tj(max)=150℃

θja=59.3℃/W

Ig=0.03A

计算得到:Pd=2.108W,Io(max)=0.249A(若考虑温升,电流更小)

(如果计算有误,烦请指出,谢谢!)