Definitely one of the preferable types for classD.
Besides low gate charge and low RDSon it has a good body diode with low Qrr and also IR specifies a high dv/dt rating.
From my conservative view it is fine for rails up to +/-65V.
Considering +/-65V and switching frequencies around 400kHz it can easily feed 4R loads from a half bridge and still has good headroom for impedance dips of the load.
current rating its depend what type of mosfet you are using, 20-30 amp is enough. Btw you can give a try and tell us the result.
That will not work, the DS junction need to be as short as possible.
Instead draw a big fat trace all the way from the output inductor to the gate driver, then draw as fat traces as the foot print allows from the fets down to the big fat trace.
Like i did in the layout i posted a few posts up.
Instead draw a big fat trace all the way from the output inductor to the gate driver, then draw as fat traces as the foot print allows from the fets down to the big fat trace.
Like i did in the layout i posted a few posts up.
D
Deleted member 148505
Hi Sameer,
Read an-1135 for class D basic layout guidelines, there are also some tips on an-978, dt04-4 and other app notes that addresses some class D issues.
Read an-1135 for class D basic layout guidelines, there are also some tips on an-978, dt04-4 and other app notes that addresses some class D issues.
Sameer use double dual totem pole no problem with traces ,may be output filter capacitor,and fedback trace more short,could share sir the schematics? its a russian design?thank for you effort sharing you work here,Go ahead
Hi Exflaco
greetings totem is MPSA42 MPSA56 isnt mpsa 42 complementary to mpsa 92
warm regards
andrew lebon FULL FILES WILL BE SHARED
greetings totem is MPSA42 MPSA56 isnt mpsa 42 complementary to mpsa 92
warm regards
andrew lebon FULL FILES WILL BE SHARED
...mostly true.
In classD the limitation often is not given by the current rating, but more by the switching losses and Rth of the MosFet.
Consequently a MosFet with good body diode and low Rth, but not impressive current rating, can easily outperform (also in terms of amp power) a stone age monster with poor body diode.
The higher your fs, the more this will apply.
I've put together a "Universal Power Module (UPM) that supports both pre and post filter feedback, as well as clocked modulators.
Bottom layer: http://i.imgur.com/IRWpUxu.png
Top layer: http://i.imgur.com/rnssSzN.png
This is however just a preliminary layout that may change at any time.
Bottom layer: http://i.imgur.com/IRWpUxu.png
Top layer: http://i.imgur.com/rnssSzN.png
This is however just a preliminary layout that may change at any time.
D
Deleted member 148505
Anyone tried CD4069 for comparator? I want to save space for the pcb so I'll gonna try it instead of CD4049
There was once a class d amplifier posted in this section that only had 4000 series or 74 series logic ics in the frontend, the OP was named nitrate and the amp was called madamp and it was a basic delta sigma approach.
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hi all i am making at least a supply to reach 2.5 kwt with o.c protection just about to finish . any ideas would be highly appreciated😀😀
hi IRSound ,i know your problem ,
change you IC CD4049 with other manufacture
i have same problem like you
and result are ok change IC CD4049 with ST manufacture ,before TI manufacture.
my irs can work at minimal 15 volt supply with out change RSS (6,8k)
regards,
Reno
to add on the above . i had problems with irs4k5 outputs were heating , once i changed the cd4049 . everything was o.k and outputs stopped heating.
Hi Tekko,
Why you call madamp???
I think Delta-Sigma design was good one compare with other self oscillated design.
Low noise,No hum and clear sound.
Regards
MANOJ