|
|||||||
| Home | Forums | Rules | Articles | Store | Gallery | Blogs | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
| Class D Switching Power Amplifiers and Power D/A conversion |
  |
|
|
|
Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving |
 |
|
|
Thread Tools | Search this Thread |
26th March 2007, 07:25 AM
|
#21 |
|
diyAudio Member
Join Date: Sep 2005
Location: in Slovenia :)
|
Hi alexclaire
Near end with designing    Any comments? |
|
|
26th March 2007, 02:01 PM
|
#23 |
|
diyAudio Member
Join Date: Sep 2005
Location: in Slovenia :)
|
Hi
It is Ultiboard from National Instruments |
|
|
|
30th March 2007, 06:19 AM
|
#24 |
|
diyAudio Member
Join Date: May 2005
Location: Avesnes/Helpe
|
Hi everyone,
gonna make changes with D AMP output stage but need some information about antiparralel free wheeling diode... Gonna put schottky common cathode in serie with mosfet drain (diode is STPS3045CW) in order to prevent current from flowing through the fet body diode (too slow) and force it to go through the outside diode (antiparrallel). I'm wondering which recovery time I should use (depends on deadtime i guess) trr=40ns is good ? or do i need less (25-28 ns) ? With 24ns deadtime (RCD circuit before IR 2113 Low and high inputs R=47ohms C=470pF) when I try to increase output signal to reach saturation output stage burns before saturation... Should i lower dead time as output stage didn't burn with low deadtimes ? I guess body diode remains reverse conductive as the other fet is turned on... someone got an idea ? |
|
|
|
30th March 2007, 06:34 AM
|
#25 |
|
diyAudio Member
Join Date: May 2002
Location: Switzerland
|
What is your switching slew rate ? Be careful not to turn the "inactive" FET on via the reverse capacitance when trying to switch too fast.
Regards Charles |
|
|
|
30th March 2007, 08:44 AM
|
#26 |
|
diyAudio Member
Join Date: Sep 2005
Location: in Slovenia :)
|
Hi alexclaire
But changes to output aren't really necessary, right? It works even without antiparralel free wheeling diode..., fets are just heating more, right? |
|
|
|
30th March 2007, 03:07 PM
|
#27 |
|
diyAudio Member
Join Date: Dec 2004
|
Hi Charles,
Can we replace the series Schottky's with this.... The centre node is a combination of 2 series nH inductors which ADD a little oFFset to body diode of mosfet, thus enabling the Fast recovery diodes to perform efficiently... Kanwar |
|
|
|
30th March 2007, 03:43 PM
|
#28 |
|
diyAudio Member
Join Date: May 2002
Location: Switzerland
|
Hi Kanwar
This wouldn't prevent the turn-on of the body diode. But it might help a little to reduce the reverse recovery current peak. But my gut-feeling tells me that I don't like it somehow. Regards Charles |
|
|
|
| Thread Tools | Search this Thread |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Back to Back transformers and safety ground | dsavitsk | Tubes / Valves | 1 | 9th February 2009 10:10 PM |
| back to back coupling capacitors | reddog | Solid State | 5 | 3rd January 2006 06:59 AM |
| Back to Back transformers to get +B of 200V ?? | Shoog | Tubes / Valves | 5 | 23rd September 2005 03:58 AM |
| (Attn Planet 10!) active xo & 2.5 way back to back Vifa P13 mids - questions | paulspencer | Multi-Way | 9 | 15th August 2004 05:34 AM |
| Back to Back Polarized Electro's | EchoWars | Solid State | 11 | 15th November 2003 09:30 PM |
| New To Site? | Need Help? |
