3 Summary

There is no perfect control mode for every situation. When designing a wireless access point or a remote radio unit using data converters and other noise-sensitive circuitry, a fixed, predictable switching frequency that is synchronizable to an external clock can be the preferred design. On the other hand, many designers are looking for easy-to-use DC/DC converters that do not require tedious compensation calculations. They may also wish to reduce the required output capacitance to meet the processor’s demanding load transient and voltage-tolerance requirements. Table 3-1 summarizes the comparison between three control modes.

All control modes complement others and has its own merit. Devices with the AECM control topology for DC/DC converters can achieve a fast load-transient response with a true fixed frequency, while still maintaining a wide output voltage and low design cost. This new control topology has been implemented in several products with good performance, ease of use and small solution size.