EasyManuals Logo

Infineon XMC Series User Manual

Infineon XMC Series
93 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #64 background imageLoading...
Page #64 background image
Introduction to Digital Power Conversion
XMC4000/1000 Family
Modulation
Application Guide 64 V1.0, 2015-01
6.5 Slope Compensation
A Negative Characteristic with Positive Properties
Slope compensation should not be seen just as a design burden to remove sub-oscillations. There
are also advantages in using Slope Compensation. For example, inherent average current mode
control without using the CPU, or a custom closed loop response by a damping factor that is
adjustable via Slope Compensation.
6.5.1 A Necessity in Fixed Frequency PCC
By observing the reflections in a current mode control loop test, by a theoretical inductor current I
L
Step Response, the test will disclose the conditions and the necessity for Slope Compensation; i.e.
when instability might occur and cause parasitic sub-oscillation, and if so, how it can be damped out.
The demo says that when the duty-cycle (D) exceeds 50% of the PWM cycle, then the system may be
unstable, unless there is a time variant reference level (ramp) as a peak current slope compensation
s
C
.
The inductor current slopes are assumed to be constant, in cases a) through to d) in the diagram
below, by long time constants.
Figure 48 Modulation Fixed Frequency PCC Duty Cycle & Slope Compensation Criteria
Note: The duty-cycle-to-output transfer function in case d) is stable if D exceeds 0.5, due the slope s
C
.

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Infineon XMC Series and is the answer not in the manual?

Infineon XMC Series Specifications

General IconGeneral
BrandInfineon
ModelXMC Series
CategoryMicrocontrollers
LanguageEnglish

Related product manuals