Here, a 6A PicoTLynx™ with a combination of a 10µF capacitor and two 47µF capacitors experiences a load step from 3A to 6A. Without the tunable loop, the voltage excursion would be 200mV and the crossover frequency would be around 24kHz. With a phase margin of 63°, this is a stable response, albeit a very poor one. This is the generic response of most POL modules and is generally only mitigated by adding external capacitance. The same module under the same step and capacitance is then tuned by adding two very small parts: a 220 Ω resistor and a 4700pF capacitor. The result is a significant reduction in the voltage excursion from 200mV down to 80mV and the crossover frequency is 3.5 times higher at 84kHz. Note that the phase margin is STILL very high at 62°. The net result is that the power module is stable, but much faster and cleaner in its transient response.