SWITCHING MODE POWER SUPPLY WITH ADAPTIVELY RANDOMIZED SPREAD SPECTRUM

摘要

In described examples, a switching mode power supply (100) includes an output filter (116), a driver (114), a pulse width modulator (104), and pulse adaptation circuitry (112). The output filter (116) is configured to provide output of the switching mode power supply (100). The driver (114) is coupled to the output filter (116) and is configured to switch current to the output filter (116). The pulse width modulator (104) is configured to generate pulses that control switching of current by the driver (114). The pulse width modulator (104) includes spread spectrum logic configured to randomize timing of the pulses generated by the pulse width modulator (104). The pulse adaptation circuitry (112) is configured to identify an instantaneous excursion of the output of the switching mode power supply (100) beyond a predetermined threshold, and to modify the randomized timing of the pulses produced by the pulse width modulator (104) based on the identified instantaneous excursion.