Understanding frequency variation in the DCS-Control topology
A common requirement in the automotive market is to avoid interfering with the AM radio band or other sensitive electronics, such as sensors. One example for power supplies is setting their switching frequency above ~1.8 MHz in order to keep all noise at a higher frequency than the highest AM radio signals. DCS-Control topology is an example of an on-time based topology which efficiently provides the low-noise and fast-transient response needed in many automotive applications. While its switching frequency does vary, this variation is understood, controlled, and usually sufficient for automotive and other frequency-sensitive applications.
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