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Class D Switching Power Amplifiers and Power D/A conversion

Hifonics bxi3000d driver signal
Hifonics bxi3000d driver signal
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Old 8th October 2019, 08:30 PM   #1
apolodor is offline apolodor  Romania
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Angry Hifonics bxi3000d driver signal

Hello for everybody. I have a problem eith my hifonics bxi 3000d. I have rail supply and without output transistor(irfp250) square signal is present on gate . When i try to mount transistor that square signal is missing and other side (low side) become verry hot , amplifier remaining in protection. Now i removed al output transistor and square signal on left side is again present. Every time when i tryed to instal transistor that signal disapear. Al transistors are good also irs21844s . I wait some answers!:-| thank you !!
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Old 9th October 2019, 12:18 PM   #2
Eva is offline Eva  Spain
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There could be 2 different things happening with the drive signal:
a) The signal is so weak it does not pull the gates measurably. Or IRS21844 is being shut down.
b) Mounting the transistors causes the output of the amplifier to be active and swing towards one rail and thus the modulator removes the drive either to one side or the other depending on wheter it is doing negative feedback, or modulation or internal signal is wrong itself.
I use to feel like the small child in The Emperor's New Clothes tale
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Old 9th October 2019, 01:53 PM   #3
MorbidFractal is offline MorbidFractal
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Given you have a problem there must have been a problem so you fixed the problem and you still have a problem. What was the problem and what did you do to fix it... what did you miss and was it an open circuit gate resistor?
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Old 9th October 2019, 03:31 PM   #4
apolodor is offline apolodor  Romania
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Amplifier was burnt. I fixed smps . I changed irs21844s because was destroyed. I applyed potentiometer between 12v and pin no.2 from irs21844 dor release muting circuit. Without output transistor i have square wave but when i try to mount 1 transistor , that signal is missing. All gate resistor and pulldown resistor are in good consition.
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Old 9th October 2019, 04:15 PM   #5
Turbowatch2 is offline Turbowatch2  Germany
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So your driving signal has voltage, but no ampere. Find out why. Have schematic? Follow the signal from start to the final transistor, a driver stage must still be defective.
Without schematic, no one can tell you where or what is still burned.
Are the transistors FET or BiPo?
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