Introduction to Digital Power Conversion
XMC4000/1000 Family
Modulation
Application Guide
69
V1.0, 2015-01
Slope Compensation: Stability Condition (2)
A consequence of the stability criteria for Slope Compensation in a fixed frequency CCM converter, is
the duty-cycle limited range, up to a certain D
MAX
level.
The area below the Slope Compensation ramp and the D
MAX
will limit the range of the duty-cycle-to-
output voltage transfer function operating points.
The area below the Slope Compensation ramp and below D
MAX
is satisfying a so called “Stable Area”:
The boundaries of the “stable area” are crossing a “significant point”. This “point” is where the actual
peak current ramp would cross the falling slope of an imagined inductor current (I
L
), for which the
maximum ripple amplitude would peak at duty-cycle D = 0.5, at a level without any Peak
Compensation.
Figure 52
PCC Slope Compensation
– Stability Control Condition (2) – “Stable Area”
