Spread spectrum oscillator

  • 30-Apr-2009 12:06 EDT


The LTC6909 silicon oscillator from Linear Technology reduces peak radiated EMI and improves 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-synchronize multiple switching regulators. Phase synchronization allows improved EMI performance, reduced input and output ripple current, and better load transient response. One external resistor sets the output frequency from 12.5 kHz to 6.67 MHz. Spread spectrum frequency modulation is used to modulate the clock frequency by a pseudorandom signal, which offers a method for decreasing peak electromagnetic emissions.
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