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Old 18th March 2010, 09:28 AM   #1
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Default pls help...using gate driver in class D amp

wish someone pro can help me....
i m doing a class D amplifier for subwoofer but facing problem in using the gate driver..,i hv tried to use ir2011 n hip4081 but fail. i decided to build an half bridge amp, using +-24v supply. switching frequency is 130khz. mosfet is irfb4212. any recommended gate driver n how to test it?
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Old 18th March 2010, 06:37 PM   #2
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Nothing wrong with gate drivers you've mentioned.
There may be numerous reasons why design's failed, none will guess.
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Old 20th March 2010, 06:26 AM   #3
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thx for ur reply....
in the attachment is wat i do...but the result is....short circuit....
i don't know wher is the error...T.T
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File Type: jpg ir2011.JPG (25.9 KB, 240 views)
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Old 20th March 2010, 12:22 PM   #4
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One obvious thing is that lower side drain must connect to Vs nd higher side source.
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Old 20th March 2010, 01:55 PM   #5
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u mean there is no problem with tis connection? so if i short the drain of the lower side to the source of the higher side, tis circuit should b working? how to test the circuit so i can confirm it is working? if i connect anode of the oscilloscope to HO, n cathode to Vs, should it b a pulse signal tat similar to the signal of HIN? and the signal of LO and COM should b similar to the signal of LIN? is the dead time for tis circuit sufficient?
Thx a lot!!!!
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Old 23rd March 2010, 04:10 PM   #6
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is the schematic wrong? any recommendation??
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Old 23rd March 2010, 05:13 PM   #7
81bas is offline 81bas  Germany
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Quote:
Originally Posted by winky4110 View Post
u mean there is no problem with tis connection? so if i short the drain of the lower side to the source of the higher side, tis circuit should b working?
yes, this should work in this way

Quote:
Originally Posted by winky4110 View Post
how to test the circuit so i can confirm it is working? if i connect anode of the oscilloscope to HO, n cathode to Vs, should it b a pulse signal tat similar to the signal of HIN? and the signal of LO and COM should b similar to the signal of LIN?
yes, something like this Make sure, that you always produce the LIN pulse first, before producing HIN pulse, since the high side driver is supplied by bootstrap capacitor (the 330nf one), which is charged during the LIN pulse...

Quote:
Originally Posted by winky4110 View Post
is the dead time for tis circuit sufficient?
it is needed to know the driver IC and mosfet types first. And then it is needed to know how you will produce the HIN and LIN pulses...

Last edited by 81bas; 23rd March 2010 at 05:28 PM.
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Old 24th March 2010, 09:21 PM   #8
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try to google how half bridge work , and you will have some lights .
Please refer to irf reference designs like iraudamp 1 just to have some basic
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Old 31st May 2010, 03:34 PM   #9
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dun connect anode of the oscilloscope to HO, n cathode to Vs, i had spoilt many ic by tis way n finally only i realised tat(IR2011). so finally the amplifier was completed. thx all of u!!!!
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