Stability At Very High Power

摘要

LAST MONTH, we explained how the 180pF compensation capacitor values are selected to not only prevent the amplifier from oscillating under normal conditions but also during recovery after being driven into clipping. While this is true for a continuous sinewave, we discovered that the Ultra-LD modules can sometimes "misbehave" in response to very large but brief signal excursions with a 4Ω load (this can be observed with peak power levels in the range of 300W). At this power level, occasionally we can observe an output deviation as the signal swings away from the negative rail.