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TAS5630 failure

cornelx
Prodigy 30 points
Other Parts Discussed in Thread: TAS5630

Hello,

Can anybody help me?

I have a problem with TAS5630; with /SD,/RESET and /OTW tied together. When I connect the load ( pure resistor 8 ohm) at a level of sinus of 27V rms TAS is going in SD state

I tried to reset it ,I stopped the power supply but no effect ( the /SD is in 0 state, READY is in 0 state,C_STARTUP is in 0 state

Power supply is at 43V - is a 60V/10Amps with current at maximum

I am using an extruded  heatsink  with brass spacers

First question - It is possible to test TAS without heatsink ?   (no load). It is protected at over temperature ?

Second question - what are the possible reasons of destroying TAS? ( I tried to make the PCB like those recommended from TI ) The components are like in the demoboard ( are not 0605 dimension; are 0805 dimension) I am utilising for filtering 15uH ( ferrite core tested at 500 khz) working at max 5A with 0.68uF

Before the amplifier go down I have seen on my scope noise on the sinus ( at maximum and minimum of amplitude)

I thanks in advance for any help

Cornelx

 

  • TI__Guru**** 189399 points

    Hi, Cornelx,

    It's not clear to me from your post --> is the TAS5630 IC permanently damaged now?

    As for running without a heat sink, it is technically feasible as we do have thermal protection (eg the /OTW flag), but there is some time constant for the heat to spread across the die, so if you attempt to run high power with poor or no heat sinking, the device may be damaged. You can certainly run it without a heat sink at lower power levels to make sure everything is working correctly, but to run it at full-power requires the use of a heat sink.

    I also didn't understand what you meant by "brass spacers"

    -d2

  • in reply to Don Dapkus
    Prodigy 30 points

    Hi,Dapkus,

    I wrote you directly from my mail, I have put there some attach. Yes it is permanently damaged (I have four in this situation)

    I tried to run without heatsink TAS (no load without connection between otw and reset but tas was broken by heating- when I made a connection protection works!- I have DKD tipe)

    Brass spacer -distance made from brass -between PCB and heatsink (heatsink is not milled is extruded and is a good surface for heating propagation - I do not know what good is this electrical connection to ground

    So If you have an advice for me, I will be happy

    I hope you received also my mail ( I do not know how is working this forum)

    Yours,

    Cornelx

     

     

     

  • in reply to cornelx
    Prodigy 30 points

    Hi,Don

    I have tested another 3650DKD -vhen the power supply was 48V and the output was 28V I have seen on my scope some spikes on the output (450Hz-sinus) spikes to ground.

    After a short time (2-3 seconds) output signal gone to ground (like it acts a protection. I had only a channel coupled to a 8 ohm load (resistive)

    After that I stopped the power supply and when I applied again power,the amplifier did not work!

    I connected the load on the other channel and the amplifier begain to work!

    I measured after that the DC voltage on the output, and one ( the channel who do not need load to work) was 0 volts (or maybe "air")  and the other one (who need load for amplifier to work) 7.6V dc . I tried the same thing (connect load) on one of other PCB who also does not work- it is working when I connect the load

    What is happening and what can I done to have not so kind of problems? -Power supply is maximum 60V at 10A

    I am waiting for an answer from you,

    Yours,

    Cornelx