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I tried it without any criterion! now i'm here to ask which parameters should be considered more for core selection .
as I told before , switching frequency is 250 KHZ so other considerable parameters could be core loss ,and behaviour (linearity or not)
because the output sound Sinusoidal...
once I tried ETD 30 with 1mm air gap and it was nice. unfortunately it was dropped down and broken.
what about RM cores ? for example RM12?
what about Iron powder cores? like T157-2?
nn20
Hi.alright?
calculations seem to be done correctly, but I am waiting for the others to share their experiences about core selection except pq4040 which you told before to know more about practical cores.
so any other suggestion for inductor core used in class D half bridge 2nd order LPF...
Hi again
I Know these you said Mr goldsmith. but considering damping factor or quality factor was problematic for me.however,thanks for your advice.
please take a look at this paper (shared link) and then tell me your idea.
link has been changed due to technical problems.
new link...
Hi
could you tell me why you consider damping factor in calculation ? what if we consider quality factor? for instance quality factor of 1/√2=0.707 would be critically damped which is ideal for this type of filter but damping factor would be=0.707 !
but when we consider damping factor=1 , Q...
what you mean by output impedance? you mean load impedance which is speaker(s)? if yes , it's 4 ohms.
another question
what's your idea about minimising cut-off frequency below 22 KHZ? this may put core on pressure to force to filter a high power bandwidth which may increase core losses and...
I know cut-off frequency is above the standard frequency you have told, but they set these values that seems incorrect! maybe their ears could hear the ultrasonics! :razz:
20-22 KHZ would be suitable for full range audio amplification,but i am to use this amp for subwoofer and input FREQ range...
Hello
I have registered in this forum to add to my knowledge from your experiences.
I have made a class D amplifier using ir2110 and 2 pairs of MOSFET half bridge topology.
switching frequency is 250 KHZ and symmetrical power supply voltage is about 60 volts per voltage rail. output load is...
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