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Understanding SWIFT Step-Down DC-DC Converters Slide 12

There are two types of compensation schemes with SWIFT devices. Internal compensation is the easier scheme to implement. The compensation is integrated within the IC allowing fewer components. However, the required inductor and capacitor may be larger than an external compensation scheme and require more board area. Since the compensation is designed with the IC, the choice of the output inductor and capacitor are limited to ensure stability. External compensation requires complex loop compensation calculations, but allows much more flexibility with the choice of output inductor and capacitor. Small resistors and capacitors are required to compensate the phase lead-lag scheme, but the result is a more optimized solution for a better transient response performance. At any rate, the SwitcherPro software design tool can help the user calculate the compensation components form externally compensated versions or select suitable inductor and capacitor to ensure stability with internally compensated SWIFT devices.

PTM Published on: 2011-11-10