I’m planning on using ±15V for a project. To power it I plan to use 2x Li-ion cells.
My concern is with HF noise from XL6007 chip. I plan to use it in SEPIC configuration to make ~±18V and then linear regulators to have smooth ±15V.
Does anyone have any experience with this chip? Or what are the correct methods to check the noise/interference with other circuitry?
I have only a small experience of using the chip except to say I was surprised by how much current it draws. So much that it ruled it out for my use case. It’s a thirsty little boost converter, so factor that into your design.
Hi, your answer is highly (and exclusively) dependent on the application you are using it for. But as a general idea regardless of the make, quality or configuration a PSU based on an IC working as a Switch mode power supply Buck, boost, SEPIC (you name it) will always be noisy no mater what you do to diminish the noise and/or interference so my advice is: stay well away from it if your application is audio or radio reception/transmitting equipment. I would happily stick with the now “classic” linear PSU configuration. It will always give you the cleanest output without having to take crazy noise filtering precautions that are not always as efficient as one might think. Else, use it but keep in mind that the 400KHz (the typical oscillation frequency for that IC) and perhaps numerous other harmonics can and (most likely) would make their way thru the output as well as thru the air. Of course, the best way to find out is to actually experiment with it first. Good luck.
This is a part of power supply for standalone curve tracer. I plan to use RP2040 as MCU for that.
I have only a small experience of using the chip except to say I was surprised by how much current it draws. So much that it ruled it out for my use case. It’s a thirsty little boost converter, so factor that into your design.
You are probably right. When I draw 30mA, the efficiency is about 76%. This doesn’t bother me, mainly because it won’t be used often. The main advantage is that I get ±15V from 2 Li-ion cells and do not have to make a 1P10S power bank.
Else, use it but keep in mind that the 400KHz (the typical oscillation frequency for that IC) and perhaps numerous other harmonics can and (most likely) would make their way thru the output as well as thru the air. Of course, the best way to find out is to actually experiment with it first. Good luck.
Thanks. I keep in mind the frequency used in the IC, and I’m not sure it is an issue. Sampled signal is 1kHz, which is two orders of magnitude slower. The funny thing is after little bit of testing I came across quite large oscillations in MHz range. Below is FFT of that signal.
I’m not sure where it comes from. LC oscillations in converter are much slower. Maybe breadboard construction is acting like antenna.