Infineon XMC Series - Slope Compensation Conditions: PCC Stable Area Examples

Introduction to Digital Power Conversion
XMC4000/1000 Family
Modulation
Application Guide 70 V1.0, 2015-01
6.5.5 Slope Compensation Conditions: PCC ‘Stable Area’ examples
Assumption
 Fixed Frequency (FF) PCC
PCC Stability: Considering ‘Outside Stable Area’ or ‘Faulty Compensation Slope’
The diagram shows four different test scenarios of an inductor current (I
L
), in a fixed frequency PCC
CCM Buck converter reference model.
In each test the slope compensation ramp is hit by a different inductor current characteristic, starting
in Cycle n.
Stability is disclosed by a perturbing ∆I
L
-step test.
Figure 53 PCC Stability – Considering “Outside Stable Area” or “Faulty Compensation Slope”
PCC Stable Area: Considering Input Voltage +∆V
IN
Perturbing, Input Voltage Regulation
The diagram shows three different test scenarios of an inductor current (I
L
), in a fixed frequency PCC
CCM Buck converter reference model. In these tests a slope compensation ramp is hit by an original
inductor current characteristic in ‘Cycle n’. Dynamic response is disclosed by perturbing +∆V
IN
tests.