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Class D Switching Power Amplifiers and Power D/A conversion

class d tda8950 blown output resistor ... need fix
class d tda8950 blown output resistor ... need fix
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Old 27th January 2018, 03:46 PM   #1
dannyjmf is offline dannyjmf  Malaysia
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Default class d tda8950 blown output resistor ... need fix

hi members ...

here i have a TDA8950 with its blown 22Ohms resistor which is the speaker out resistor. During the time it blows it was connected to a failed eq module which has oscilation issue ... that moment no speakers were connected to this tda8950 module when it happened ... there were pictures of the burnt mark shown

I intend to repair this amplifier module by replacing the blown 22Ohms resistor ... but since it is my first time working with class d amplifiers for repair ... if the output resistor blows, anything else should i look out for? now the amplifier module has been pulled out from its chassis and after the repair i would conduct a standalone test for it before re-installing it.

helps were really appreciated ...
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Old 27th January 2018, 05:20 PM   #2
theAnonymous1 is offline theAnonymous1  United States
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Without a load the output RC absorbs all of the high frequency resonance and you end up with your current situation. Replace the resistor and don't power it without a load again.
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Old 28th January 2018, 01:06 PM   #3
coolmaster is offline coolmaster
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I was building a speed controller with this same module. Can't recall what I did, one 22ohm resistor smoked but not to the extent of open circuit. I promptly replaced with a same 1W metal oxide of the same value and its been trouble free since. This is after I made sure whatever connections are all correct. I don't think there's anything else to look for. The protection circuit should kick in if there's anything seriously wrong.
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