Crunch BLX-1000D reanimation with IRS20955 gate driver trouble. - diyAudio
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Old 3rd July 2011, 05:18 PM   #1
djmdp is offline djmdp  Poland
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Default Crunch BLX-1000D reanimation with IRS20955 gate driver trouble.

Hello, I'm new in this forum, and sorry for my poor english I have a trouble with this gate driver, something's wrong during high side mosfet OFF, the low side mosfet is ON earlier than high side off. On the simulation there's a PULSE GENERATOR because this crunch amp has own ic pwm gen at 0-15V voltage level, and the vdd voltage for irs will be the same voltage. Maybe someone knows what's the problem with that?
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Old 3rd July 2011, 07:12 PM   #2
savu is offline savu  Romania
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loose d4 and d5 and try again

regards,
savu
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Old 3rd July 2011, 07:52 PM   #3
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I agree, D4 and D5 arent needed because the chip has a deadtime generator.
If you are still getting shoot through then alter the deadtime.
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Old 4th July 2011, 07:08 AM   #4
djmdp is offline djmdp  Poland
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Ok, I will try it today, and write back at evening.
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Old 5th July 2011, 07:52 PM   #5
djmdp is offline djmdp  Poland
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Originally Posted by djmdp View Post
Ok, I will try it today, and write back at evening.
Hello, finally I've got some new info's. I removed gate diodes, recalculated current sensing for high side mosfet and for the low side (both 24A trip), but it doesn't helped me. I found out that mosfets with higher Rdson (125mohm in this simulation) working so much better but I don't know why is that? Any suggestion? Setting deadtime by tying DT pin to COM hasn't got positive effect on low side on, it working only on high side on.
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Old 7th July 2011, 12:53 PM   #6
Eva is offline Eva  Spain
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The purpose of D4 and D5 is not just dead time, they result in a di/dt boost for turn-off (highly desirable).
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Old 7th July 2011, 01:35 PM   #7
djmdp is offline djmdp  Poland
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The purpose of D4 and D5 is not just dead time, they result in a di/dt boost for turn-off (highly desirable).
I thought the same when I was placing it on the schematic. So, what's the best didoes for this purpose??
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Old 8th July 2011, 06:34 PM   #8
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the mur120 you have would do it perfectly, i think, these are fast diodes
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