Tool/software:
1 .Does it support 1ohm 80W in PBTL mode,and if there is some potential risk about other specification?
2. Spread spectrum 8% is PWM ±8% or±4%?
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Tool/software:
1 .Does it support 1ohm 80W in PBTL mode,and if there is some potential risk about other specification?
2. Spread spectrum 8% is PWM ±8% or±4%?
Hi,
Regards,
Gregg Scott
Thank U,now we use it at PWM=384k±8% for EMC,but it also can work well and the performance is al ok
1.As TYP value, frequency variation 8% is requested in datasheet, how about max one?
2.For example, when setting PWM frequency to 480kHz, and register 0x77 to 84, 0x78 to 30, 0x79 to 05 .
SO we get the
SS-AMPL=4
SS-PRE-DIV=48
SS-STEP=5
Make sure which one is correct to calculate the max/cent/min spread-spectrum frequency for keeping variation not over 8% (+/- 4%) spec?
1)As per fomula below, we get Fmin=256*48kHz/(48*2+2+4)=120.5kHz
Fcent=256*48kHz/(48*2+2)=125.4kHz
So, Fsw_ssΔ=(125.4-120.5)/125.4=3.9%<4%(spec)
The follow blue word is the datasheet content
The follow equations calculate the output PWM frequency variation with the settings listed previously.
2)As per another below, we will get the bad variation result of Fsw_ssΔ=4/64=6.25%>4%(spec)
3., How can we get Fpwm_cent according to a certain formula from Fcent? Fcenter*?=480k,the ? is fixed or regulated for 480k
We found the best set is 0x77 : 84 0x78: 20 0x79: 05,the EMC will be OK, we can not sure about the spread spectrum is OK or not? and what should to check the other things to make sure we can use the parameter. PWM=384K and 480K two conditions both use the same parameter
Hi,
There is another thread from the same IP address on this issue:
(+) TAS6424E-Q1: TAS6424E-Q1 Spread Spectrum Issue - Audio forum - Audio - TI E2E support forums
I will close this one.
Regards,
Gregg Scott
I am so sorry that i found my workmate had asked the same question... But i think your answer is very professional that i want get your answer,thank U