Transfer function of current modulator in PWM converters with current-modecontrol

Several different expressions have been derived in previous publications fo r the transfer function of the current modulator used in pulsewidth modulat ed (PWM) de-de power converters with current-mode control. These expression s give results higher than the measured ones and exhibit many other problem s, e.g., one expression gives an infinite value when no slope compensation is used. This paper presents a derivation for the transfer function of the current modulator used in PWM converters with fixed-frequency, trailing-edg e modulation, peak-current-mode control for two eases: without and with slo pe compensation. In addition, feedforward terms are also derived.