Clock synchronises up to eight switching regulators

Electronics Technology

14 October 2009 Electronics Technology

The LTC6909 from Linear Technology is a precision silicon oscillator designed to reduce peak radiated EMI and improve control of switching regulators in multiphase power supplies. The device has eight separate outputs, providing up to eight rail-to-rail 50% duty cycle clock signals. These outputs can be used to enable or disable and phase-synchronise multiple switching regulators.

Phase synchronisation offers a number of design advantages, according to the manufacturer, including improved EMI performance, reduced input and output ripple current, and better load transient response. Using three logic inputs, the phase relationship between these outputs can be configured from 45° to 120°, or the outputs can be placed in a logic low or high-Z state.

A single resistor selects the output frequency from 12,5 kHz to 6,67 MHz. The LTC6909 also offers spread spectrum frequency modulation (SSFM), a technique that modulates the clock frequency by a pseudorandom signal. SSFM is easily enabled and offers a method for decreasing peak electromagnetic emissions. The amount of frequency spreading is fixed at ±10% of the centre frequency, and the user selects one of three modulation rates.

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Clock synchronises up to eight switching regulators

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