Try not to wire under LDO. What is the specific reason?

刘木木

Try not to wire under LDO. What is the specific reason? [Copy link]

Try not to wire under LDO. What is the specific reason?

qwqwqw2088

For anti-interference, refer to the LDO datasheet manual for wiring instructions. If there are special requirements, they are generally explained in the instructions.

lcofjp

Don't wire under DCDC

刘木木

qwqwqw2088 posted on 2018-3-30 11:23 To prevent interference, please refer to the LDO datasheet manual for wiring instructions. If there are special requirements, they are generally explained

Does the signal interfere with the LDO? Or does the LDO interfere with the signal?

刘木木

lcofjp posted on 2018-3-30 11:26 Don't wire under DCDC

Why?

lcofjp

Liu Mumu posted on 2018-3-30 12:40 Why

DCDC will interfere with the signal line

chunyang

"Try not to route wiring under the LDO" is too general and misleading, so it is wrong to say so. LDO usually has low noise. If there are pulse/digital signal lines nearby, because these signals have rich high-order harmonic components, the noise is easy to couple to the LDO output circuit, which will have a negative impact on sensitive loads. However, this situation is rare. The design of sensitive circuits is not as simple as whether to route wiring or not. In most cases, routing is necessary. The situation of DCDC is similar, and specific analysis is also required. It can be seen that we must know the facts and the reasons, otherwise it will be a joke of copying.

刘木木

chunyang posted on 2018-3-30 17:07 "Try not to wire under LDO", this statement is too general and very misleading, so it is wrong. LDO usually has lower noise...

Hmm, the analysis is thorough. Some seniors said this, but they couldn't explain the reason clearly, so I came to find the master

刘木木

chunyang posted on 2018-3-30 17:07 "Try not to wire under LDO", this statement is too general and very misleading, so it is wrong. LDO usually has lower noise...

Hmm, the analysis is thorough. Some seniors said this, but they couldn't explain the reason clearly, so I came to find the master