Greetings:
What are the intended uses for these things:
I tried hooking a pair of 27uH (they are also rated at 16uH at 9.8A), with a pair of 8.2uF caps as a differential LCR filter at 100kHz, to a load of 2.55ohms as the output filter stage for an Apex SA-60 PWM amplifer.
Idling with zero volts out the coils get warm. But when I put 7Vrms at
4kHz into the 2.5ohms, they get almost smokin' and whine as well as the output being substantially attenuated. Simulation indicates only about 5A peak through the things with these numbers, and the output amplitude shouldn't experience much attenuation even up to 10kHz.If these things can't even tolerate 4kHz at half their rated current, what are they good for? Why do companies like JW Miller market products that are not specified completely? Perhaps the only thing they are really good for is EMI chokes.
I guess I'll be making a gapped core inductor on a good HF core like the
3C90 I bought a while back. Hope ETD29 is big enough so I don't have to order more...Good day!