Rockford Fosgate 100X2 Owner's Manual page 8

High powered audio amplifiers must always address the
problem of power device reliability. In particular, load fault
conditions can easily destroy an amplifier that is not
carefully designed. Rockford Fosgate has answered this
problem with the development of Real Time Power Pro-
tection (RTPP).
The RTPP circuits protect the Punch amplifiers by multi-
plying output device voltage and current values to obtain
approximate instantaneous device power. This instanta-
neous power calculation is then processed through a time
constant closely modeling the device heating time. If the
resulting modeled junction temperature exceeds a set
threshold, gate drive to the output devices is limited.
To get a better understanding of the Punch let's take a
closer look.
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