deepsetan
Advanced Member level 4
I wish to understand more on power parameter needed to design the power supply of audio amplifier.
Which power parameter should we use when designing the SMPS? Is it peak power or rated power?
Lets take an example as below:
SMPS topology:
Flyback quasi-resonant type
Assume Class-D audio amplifier requirement as below:
Peak power : 250W (in short period, less than 5s)
Rated power : 50W
Speaker : 8 ohm
This is example I found on internet https://www.eetimes.com/understanding-class-d-amplifier-power-supply-requirements/#
Based on above example, the BTL output is 50W. This 50W is based on RMS value. Based on that, the minimum power supply voltage is 33.4V.
But if we use peak BTL output 250W, this will give minimum power supply voltage around ~70V.
Based on above calculation, I conclude as below:
If use rated power, the minimum voltage power supply is ~33.4V
If use peak power, the minimum voltage power supply is ~70.0V
Based on that, which voltage should I use for my power supply output voltage? Is it 33.4V or 70.0V?
Which power parameter should we use when designing the SMPS? Is it peak power or rated power?
Lets take an example as below:
SMPS topology:
Flyback quasi-resonant type
Assume Class-D audio amplifier requirement as below:
Peak power : 250W (in short period, less than 5s)
Rated power : 50W
Speaker : 8 ohm
This is example I found on internet https://www.eetimes.com/understanding-class-d-amplifier-power-supply-requirements/#
Based on above example, the BTL output is 50W. This 50W is based on RMS value. Based on that, the minimum power supply voltage is 33.4V.
But if we use peak BTL output 250W, this will give minimum power supply voltage around ~70V.
Based on above calculation, I conclude as below:
If use rated power, the minimum voltage power supply is ~33.4V
If use peak power, the minimum voltage power supply is ~70.0V
Based on that, which voltage should I use for my power supply output voltage? Is it 33.4V or 70.0V?