Trouble Shooting for TDA1562Q Car Amp

Junior · 10th March 2005, 07:25 AM

Hi Guys,

I had built a car amp based on TDA1562Q.
Attached is the schematic as well as the board that I had come out with.

The problem here is that I after powering up for about 15 to 20 seconds, the just faded away. I do not have any single idea why this happen

I am hoping that someone here who had built this amp can be of help.

Thanks in advance......

Junior · 10th March 2005, 07:27 AM

the schematic

arasuk · 10th March 2005, 04:56 PM

Hi Juniour!!

I built this , but no problemo!! let me know whats the power supply you used and was the heat sink touching the gnd.

thanks

arasuk

Junior · 11th March 2005, 01:30 AM

hi arasuk,

thanks for the reply.
i assume that the schematic and the pcb that i fabricated is working well.

the power supply that i used is 0-15 V (PS1), which if to pweor my preamp (OPA2134+BUF634) and is just for testing.

i will check if the heat sink is touching the ground.
beside that, is there any other possibilty?

thanks......

Junior · 11th March 2005, 02:21 AM

forget to ask.
should the heat sink be grounded?

buloi123 · 11th March 2005, 06:41 AM

Quote:

Originally posted by Junior
Hi Guys,

I had built a car amp based on TDA1562Q.
Attached is the schematic as well as the board that I had come out with.

The problem here is that I after powering up for about 15 to 20 seconds, the just faded away. I do not have any single idea why this happen I am hoping that someone here who had built this amp can be of help.

Thanks in advance......

Hello. Maybe you don't put enough heatsink on your amplifier to absorb the heat from TDA1562Q.

The TDA1562Q is basicaly has low power output at about 18W but because of the external electrolytic capacitors, the internal supply voltage is lifted and due to this momentarily higher supply voltage, the output power will reach up to 70W.

If the case temperature exceeds 120C, the high power supply voltage is disabled and the output power is back to low power (this maybe this is what you said faded output). And when the supply voltage drop below the minimum operating level, the amplifier will be muted (you can hear no output).

Junior · 13th March 2005, 11:26 PM

hi arasuk,
yes, the heatsink in in fact touching the ground.

hi buloi123,
will double check to see is my heat sinking enough.

guys, thanks for the help...

10th March 2005, 04:56 PM	#3
arasuk diyAudio Member Join Date: Dec 2003 Location: bangalore	Hi Juniour!! I built this , but no problemo!! let me know whats the power supply you used and was the heat sink touching the gnd. thanks arasuk __________________ thanks a many for the diy audio for its existence.

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11th March 2005, 01:30 AM	#4
Junior diyAudio Member Join Date: Jun 2004 Location: Singapore	hi arasuk, thanks for the reply. i assume that the schematic and the pcb that i fabricated is working well. the power supply that i used is 0-15 V (PS1), which if to pweor my preamp (OPA2134+BUF634) and is just for testing. i will check if the heat sink is touching the ground. beside that, is there any other possibilty? thanks......

11th March 2005, 02:21 AM	#5
Junior diyAudio Member Join Date: Jun 2004 Location: Singapore	forget to ask. should the heat sink be grounded?

13th March 2005, 11:26 PM	#7
Junior diyAudio Member Join Date: Jun 2004 Location: Singapore	hi arasuk, yes, the heatsink in in fact touching the ground. hi buloi123, will double check to see is my heat sinking enough. guys, thanks for the help...

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