Posted on October 20, 2017 at 14:16Hi,
I'm repairing an audio power amplifiers from a top model manufacturer like Harman-Kardon, Dynaudio, Bose from cars. And in almost all of models I faceing up with broken regulator L5973. The failure is that the voltage on the output increases to 4-5V causing a damage in connected DSP chips. This is standard application from page 9 from the ST datasheet. Input is 12V output is 3,3V.
What can be a root cause of this behaviour? When I replace for new IC it is working in next coulpe of months ok and again fails.
Maybe somebody had this case and could share some ideas
Regards,
Pawel
