TDA-7498-L burn

[avionica]

Posted on June 28, 2016 at 16:01

Hi To all,

I have a problem to new design, based to de datasheet of the TDA-7498-L, Every time when I put in STBY off, the Intensity increase, and the device is burn. I compare two, diagrams and I doesn�t found possible the fail. Attached I send my Schematic Any suggestion..? Many Thanks In advance #tda-7498 #audio-amplifiers

[Nickname1623_O]

Posted on June 29, 2016 at 04:11 Hi Pep, there are some misconnection of standby and mute control signal in your schematic , but it may just lead pop noise during power on/off . could you also share your pcb layout and power on/off sequence for 3.3V and Vin ? and also please check rated voltage for 100nf cap, it's better to use 50V X7R type MLCC for this application . Thanks YT

[avionica]

Posted on June 29, 2016 at 07:41

Hi, Zhao.

Thanks a lot for your answer. Sure, i send to you the dessign to my pcb, no problem. The problem in my design, is When connect the power supply to my pcb, works fine, no problem, the quiescense instensity is not more than 5 mA, but when in put the system in standby off, increase the instensity, and the chip is destroy.. I doesn´t undesrtand wher is the problem.. ________________ Attachments : tda7498-pcb.bmp : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Ht23&d=%2Fa%2F0X0000000aJ5%2FhdGpVI4JFA7Va97S2MQgY_xvAD7uRZCaaHd6acTZdaQ&asPdf=false

[Nickname1623_O]

Posted on June 30, 2016 at 08:25 hi Pep , according to you laytout ,C19,C25 ,C30 and C31 had been put far away from IC pin lead . those capacitors are critical for IC performance and reliability . that's why you are facing current issue. you may refer to TDA7498E layout from below link , there are some difference between TDA7498E and EDA7498L in gain setting and mono mode setting .

http://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/audio-ic-eval-boards/steval-cca044v1.html

any query , please let us know Thanks YT