Protection Circuits; Output Device Emulation Protection (Odep); Macro-Tech Indicator States - Crown Macro-Tech 3600VZ Reference Manual

Macro-Tech 3600VZ Power Amplifier
amplifier's performance. As input overload indicators,
they flash brightly with a 0.5 second hold delay when
an input signal that is too large begins to cause early
clipping distortion at the input. Note: the Channel 2 IOC
indicator will stay on in Parallel-Mono mode.

4.3 Protection Circuits

Macro-Tech amplifiers provide extensive protection and
diagnostics capabilities. Protection systems include
ODEP , "standby," and an AC circuit breaker. These fea-
tures provide protection under any conditions.
Reference Manual
Fig. 4.2 Macro-Tech Indicator States

4.3.1 Output Device Emulation Protection (ODEP)

Crown invented ODEP to solve two long standing prob-
lems in amplifier design: To prevent amplifier shutdown
during demanding operation and to increase the effi-
ciency of output circuitry.
To do this, Crown established a rigorous program to
measure the safe operating area (SOA) of each output
transistor before installing it in an amplifier. Crown also
designed intelligent circuitry to simulate the instanta-
neous operating conditions of those output transistors.
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