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Old 27th May 2004, 02:22 AM   #1
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Arrow Best Deadtime Delay Circuit in Class-D

Hi guys,

Could PLZ comment on , What s the best way to implement the Deadtime delay to avoid Shoot through in PWM Class-D amps.
1]Resistor+Capacitor+diode combination
2]Delay line using Cmos IC[I dont want to use CMOS ICs]
3]Anyother ???

ampman
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Old 27th May 2004, 08:16 PM   #2
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This is dependent on the output stage configuration.
What are you using?
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Old 27th May 2004, 09:11 PM   #3
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We use at work Harris/Intersil HIP4081 (or 4082?) and this IC has built-in deadtime adjustment. You only have to change an external resistor.
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Old 28th May 2004, 12:45 AM   #4
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Quote:
Originally posted by Nelson Pass
This is dependent on the output stage configuration.
What are you using?
I am using Convenetional Half Bridge topology using IR2110 Gate drivers with IRF540N mosfets.
AmPmAn
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Old 28th May 2004, 08:17 AM   #5
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I suggest that you check out these HIP408x IC's.
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Old 28th May 2004, 09:21 AM   #6
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I wouldn“t think that you need additional deadtime with IR2113 because the internal deadtime is at least 30ns. I use HIP2101 which has about 3ns deadtime and I have applied a diode, resistor, capacitor circuit giving about 20ns deadtime. Instead of IRF540N I use 540Z which has a much faster body diode (decreases the shoot through rapidly) with a 20ohm gate resistor combined with a BAS32L turn off diode. This way I achieve 25ns rise and fall times with +/-40V supply voltage.
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Old 31st May 2004, 12:56 AM   #7
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Quote:
Originally posted by peranders
I suggest that you check out these HIP408x IC's.

HIP408X are rated upto 80 Volts only , which is not sufficient for high power amplification where as IR2110 is rated at 500V

AmPmAn
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Old 31st May 2004, 06:36 AM   #8
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If you need a "high enough voltage" driver, check out the IR2010 which is a 200V device with 2A drive capability and about 30ns internal deadtime.
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Old 31st May 2004, 12:22 PM   #9
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Hi AmpMan!
Is there a reason why you do not use the IR21094?
IR21094 offers an adjustable dead time in the range between
0.54µs...5µs with just one resistor.

Do you need the possibilty to control the ON-time of the upper
and lower MosFet in separate? Then forget the IR21094.
But a traditional PWM-amp should be possible without fancy
conrol mechanisms and the drive signals of the upper and lower MosFets contain simply the inverted information + some dead time.
For this the logic of IR21094 should work fine.

Bye
Markus
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Old 31st May 2004, 12:24 PM   #10
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....or is already 540ns dead time unacceptable long?
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