PLECS 3.0 Online Help

Peak Current Controller

Purpose

Implement peak current mode control.

Library

PLECS Extras / Modulators

Description

[Picture]

This block implements current mode control in a switching converter. At the beginning of each switching cycle, the output is set. When the Isense   input exceeds the Iref   input, the output is reset.

Parameters

Switching frequency
The switching frequency of the output signal.
Minimum duty cycle
This sets the minimum time the output remains on for at the beginning of each switching period. This value must be greater than zero and less than the maximum duty cycle.
Maximum duty cycle
This defines the maximum permissible duty cycle of the switch output. If Isense < Iref  , the output will turn off if the duty cycle exceeds this maximum value. The maximum duty cycle must be less than 100 %.
Slope compensation
Slope compensation can be applied to ensure stability when the output duty cycle exceeds 50 %. Entering a parameter, Islope  , reduces Iref   during each switching cycle as follows: I′ref = Iref - Islope ⋅t∕Ts  , where t   is the time elapsed from the start of the switching cycle and Ts   is the switching period. Slope compensation can be omitted by setting Islope   to 0.