ir2110 and 6 x irf640 per side?

jake83 · 22nd February 2007, 05:40 PM

Hi

I have been wondering if it is possible to use ir2110 gate driver to drive directly six irf640 per side @ 50 kHz? This would be a subwoofer amp...

What would be suitable duty cycle? 95%-5%?

Thanks.

mgm2000ro · 22nd February 2007, 06:58 PM

http://img443.imageshack.us/img443/8...zistoriqd1.jpg

zilog · 23rd February 2007, 02:29 PM

I have scanned three pages from Pressman's book, where rise and fall time for different mosfets and differing gate drive currents is shown. Dont forget that you will need substantial current sinking capability to keep the low side mosfets from turning on through the miller capacitance when the output swings from low to high, and vice versa.

http://wintermute.csbnet.se/~zilog/presman1.jpg
http://wintermute.csbnet.se/~zilog/presman2.jpg
http://wintermute.csbnet.se/~zilog/presman3.jpg

jake83 · 26th February 2007, 08:53 AM

Thanks for answers

I have been thinking about buffering ir2110 outputs...

Is bipolar complementary pair most commonly used?

How about using mosfets to buffering? I haven't found any examples of this. Should there be high Vgs voltage also in these buffer mosfets (I believe so).

jake83 · 26th February 2007, 11:58 AM

As for using bipolars, I have been thinking to use BD243/BD244...

sixtek · 26th February 2007, 01:44 PM

No need for these medium power BD243/244 devices...
BC327/337 or BC639/640 will do the job!

zilog · 26th February 2007, 01:52 PM

Just make sure the BJTs have high enough hfe at the Ic you want to drive your mosfets with, smaller BJTs often fail at this.

jake83 · 26th February 2007, 04:41 PM

Quote:

Originally posted by sixtek
No need for these medium power BD243/244 devices...
BC327/337 or BC639/640 will do the job!

What do you think, how high gate charge load are these devices able to drive for example @ 50 kHz ?

sixtek · 4th March 2007, 01:08 PM

At 50kHz IRF640 needs max. 3mA gate drive current.

22nd February 2007, 05:40 PM	#1
jake83 diyAudio Member Join Date: Jan 2007 Location: Kemi, Finland	ir2110 and 6 x irf640 per side? Hi I have been wondering if it is possible to use ir2110 gate driver to drive directly six irf640 per side @ 50 kHz? This would be a subwoofer amp... What would be suitable duty cycle? 95%-5%? Thanks.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
how ir2110 drives the high side mosfet in h bridge	gowri	Class D	2	10th April 2008 06:30 AM
Active Elevated Rail Hi side Bootstrapping Technique for IR2110	Workhorse	Class D	93	6th November 2007 08:49 AM
IRF640 vs IRF640N	Tom7227	Car Audio	6	16th June 2007 10:19 PM
Is IRF640 useful..	skaara	Pass Labs	5	3rd November 2003 04:27 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

22nd February 2007, 06:58 PM	#2
mgm2000ro diyAudio Member Join Date: Nov 2004 Location: Bucharest	http://img443.imageshack.us/img443/8...zistoriqd1.jpg

23rd February 2007, 02:29 PM	#3
zilog diyAudio Member Join Date: Oct 2005	I have scanned three pages from Pressman's book, where rise and fall time for different mosfets and differing gate drive currents is shown. Dont forget that you will need substantial current sinking capability to keep the low side mosfets from turning on through the miller capacitance when the output swings from low to high, and vice versa. http://wintermute.csbnet.se/~zilog/presman1.jpg http://wintermute.csbnet.se/~zilog/presman2.jpg http://wintermute.csbnet.se/~zilog/presman3.jpg

26th February 2007, 08:53 AM	#4
jake83 diyAudio Member Join Date: Jan 2007 Location: Kemi, Finland	Thanks for answers I have been thinking about buffering ir2110 outputs... Is bipolar complementary pair most commonly used? How about using mosfets to buffering? I haven't found any examples of this. Should there be high Vgs voltage also in these buffer mosfets (I believe so).

26th February 2007, 11:58 AM	#5
jake83 diyAudio Member Join Date: Jan 2007 Location: Kemi, Finland	As for using bipolars, I have been thinking to use BD243/BD244...

26th February 2007, 01:44 PM	#6
sixtek diyAudio Member Join Date: Jan 2007	No need for these medium power BD243/244 devices... BC327/337 or BC639/640 will do the job!

26th February 2007, 01:52 PM	#7
zilog diyAudio Member Join Date: Oct 2005	Just make sure the BJTs have high enough hfe at the Ic you want to drive your mosfets with, smaller BJTs often fail at this.

4th March 2007, 01:08 PM	#9
sixtek diyAudio Member Join Date: Jan 2007	At 50kHz IRF640 needs max. 3mA gate drive current.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)