Measuring Feedback Loop Response In Power Systems. LeCroy Application Brief No. LAB 439
Control Loop Analysis
Measuring Feedback Loop Response In Power Systems
Every power supply has a feed-
back loop that monitors the
output voltage or current and
keeps the device’s on-time ap-
propriate to the load. This
means that the power device
conducts longer if the output
voltage is too low. Most
switched mode power supplies
use pulse width (PWM) or fre-
quency modulation (FM) in their
control loops. Analysis of the
loop dynamics requires the abil-
ity to demodulate these signals.
Power Measure Analysis
(PMA2) software, available in
LeCroy X-Stream oscillo-
scopes, includes easy-to- use
modulation analysis capabilities.
Figure 1- Measuring the step……
