Feed through capacitors
Hi, I would like to suggest a magazine article discussing the use of feed through SMT capacitors in filtering. Of Particular interest is there potential use in replacing (enhancing) the LC network on a DC DC converter and their effect on supply rail filtering for audio amplifier systems. There appears to be very little use of these devices.Kirk SceviourKdsceviour@gmail.com
Hi, I would like to suggest a magazine article discussing the use of feed through SMT capacitors in filtering. Of Particular interest is there potential use in replacing (enhancing) the LC network on a DC DC converter and their effect on supply rail filtering for audio amplifier systems. There appears to be very little use of these devices.
Kirk Sceviour
Kdsceviour@gmail.com
Discussie (1 opmerking(en))
CopperDog 11 jaar geleden
The feed through capacitor seems to be pretty much ignored by most people designing circuits including myself. The device caught my interest just recently however while arranging the PCB layout of a switching DC DC converter in very limited space. I simply couldn't get the SMD filtering inductors to fit in the space provided. Could they possibly be done away with without compromising the circuit? Apparently the answer is yes.
I've yet to see it in action however as one manufacturer puts it 'SMT feedthru filter capacitors can actually replace discrete L/C filter networks (depending on the frequency response needed).' That appears to be a significant claim even in my limited expertise. They go on to state that feed through capacitors do a better job than conventional design in:
Seems like an obvious choice or at least an alternate when designing circuits involving these aspects and yet where are they?
Hence the suggstion for this project. My particular case involved the LT3462, Linear Technologies 1.2 MHz Switching DC DC converter. The filtering circuit consists of two 22uH inductors and a 1uF flying capacitor. Is there a way to ditch the inductors? What about the other uses for feed through caps?