Introduction to Digital Power Conversion
XMC4000/1000 Family
Control Loops
Application Guide 81 V1.0, 2015-01
7.3 Using FADC Compare Mode; Slope Compensation Add-On
The Low-end XMC devices that do not offer an embedded analog comparator are still able to meet
the functionality of current mode control to a greater or lesser extent, by using the Fast Compare
Mode of a VADC:
The inductor signal (I
L
*[R
i
]) is slope compensated by an add-on circuit and compared to a fixed digital
reference value that is stored in the result register ‘x’ of the VADC channel that is used.
Figure 65 Peak Current Mode Control – VADC Fast Compare Mode – Slope Compensation
Fast VADC Compare Mode (FADC) Properties
Conversion rate is e.g. 150 ns.
Resolution is 10 bit.
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