When speaker is not connected,
oscillation is occured and OCP works.
I understand LC filter have excessively peak when speaker is not connected.
But, other device (TAS5614,TAS5624) doesn't occur the same issue.
Could you tell me what is the difference between closed loop of TAS56760 and that of TAS5614?
If possible could you show me the block diagram or circuit?
Dear Dylan san,
Thank you for your replay.
Inductor is DBL1010HB-100M <www.sagami-elec.co.jp/.../detail.php
Its DCR is very low (15 mohm), so Q becom very high.
but, when using same parts for TAS5614, it's no problem.
I suppose closed loop circuit have difference.
To take current waveworm, wire need to insert,
and that makes R getting bigger.
So, the issue may not be repuroduced.
I got the voltage waveform,instead.
It indicates oscillation is occured and
output level get bigger and bigger.
I think it's caused by parasitic resistance such as Rds(on).
Current feeds π/2 from voltage and voltage drops I * Rds(on).
Perhaps, difference between Rds(on) is the reason, that TAS5760M occurs oscilation while TAS5614 doesn't occur?
According to datasheet, TAS5760M=150mohm, TAS5614=60mohm.
