A controller controls Pulse Width Modulation (PWM) signals of one or more phases. The controller includes a phase sequencer to select a phase, a common ramp generator generating a common ramp signal, a phase activation circuit to turn on the PWM signal of the selected phase based on the common ramp signal, and for each phase a Current Sense plus Ramp (CSR) signal generator to generate a phase CSR signal according to a current of the phase and a phase deactivation circuit to turn off the PWM signal of the phase based on the phase CSR signal. A method of controlling PWM phases comprises selecting a phase, generating a common ramp signal, turning on the PWM signal of the selected phase based on the common ramp signal, generating CSR signals according to currents of the phases, and turning off the PWM signals based on the respective CSR signals.