REGISTER | LOGIN
Home    Bloggers    Blogs    Article Archives    Messages    About Us   
Tw  |  Fb  |  In  |  Rss
Comments
Newest First | Oldest First | Threaded View
EE-Bob
EE-Bob
11/28/2018 4:12:00 PM
User Rank
Newbie
Single GND poured plane for SMPS Circuits
When selecting a switching regulator IC, in addition to availability, cost, part count, performance, and believability of modeling/simulation tools, I also consider if the circuit can be laid out on a single layer ... and more inportantly, with a single, contiguous ground plane (PGND) where the input/output capacitors, IC and feedback/loop conpantens can connect. The plane can be poured over an internal GND layer, but the vias used to connect the local PGND plane to the internal GND plane need to be carefully considered. A single via is great, but output currents may require more. These should be grouped as tightly as feasible. If the IC uses a thermal-pad, the vias can be placed under this pad to help with thermal performance. (However, consult your PCB Assembly CM for DFM concerns!) Location of these vias will also drive undamped/snubbed inductance in the switching node that can lead to ringing affecting you EMC performance.

This approach most resembles that of Example #1, only in a vertical stack rather than co-planar.

50%
50%
raleighsimon
raleighsimon
11/28/2018 5:40:27 AM
User Rank
Newbie
cool
nice post

50%
50%
alicetaylor
alicetaylor
11/22/2018 11:32:11 PM
User Rank
Newbie
thanks
Your topic is very great and useful for us...thank you

 

50%
50%


latest blogs
How can you accurately measure this impedance to give reliable lead-off detection in ECGs?
Fast switching transitions can yield some disadvantages. Interference in the frequency range of the switching transitions between approximately 20 MHz and 200 MHz increases dramatically.
The U-channel format consists of an open frame PSU mounted into a U-shaped aluminum chassis.
The primary difference between the speakers I designed and the micro- and mini-speakers that Eminence makes is that the diaphragm is connected directly to the voice coil as opposed to an Aluminum or cardboard 'former' to which the voice coil was connected
flash poll
educational resources
 
follow Planet Analog on Twitter
Planet Analog Twitter Feed
like us on facebook
our partners
Planet Analog
About Us     Contact Us     Help     Register     Twitter     Facebook     RSS