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Burst power tests with 4ohm//2.2uF load
Tests were performed with 4ohm in parallel with 2.2uF load, with sine bursts (rectangular window) of 1kHz, 10kHz and 20kHz.
4ohm//2.2uF (measured) impedance plots:
With amplifier approx. 35Vrms max. output and 4ohm//2.2uF load the output current at 20kHz looks like this:
This is a considerable stress to amplifier output stage requesting 13.4 Arms output current.
Below please see oscilloscope records of the 1kHz, 10kHz and 20kHz bursts. Bursts are generated by DAC at Fs=96kHz, thus the ringing. 35Vrms output voltage makes 306W/4ohm. At 20kHz, we get 430W/2.76ohm impedance magnitude and 1110W with respect to 1.07 ohm EPDR.
I will repeat this test with Hypex NC252MP soon.
Tests were performed with 4ohm in parallel with 2.2uF load, with sine bursts (rectangular window) of 1kHz, 10kHz and 20kHz.
4ohm//2.2uF (measured) impedance plots:
With amplifier approx. 35Vrms max. output and 4ohm//2.2uF load the output current at 20kHz looks like this:
This is a considerable stress to amplifier output stage requesting 13.4 Arms output current.
Below please see oscilloscope records of the 1kHz, 10kHz and 20kHz bursts. Bursts are generated by DAC at Fs=96kHz, thus the ringing. 35Vrms output voltage makes 306W/4ohm. At 20kHz, we get 430W/2.76ohm impedance magnitude and 1110W with respect to 1.07 ohm EPDR.
I will repeat this test with Hypex NC252MP soon.
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