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A current limiter will
not
yield to the load butwill sustain the
constant current demands of the inductive load without
flyback.
Early amplifier designs frequently employed fixed current
limiters but had serious difficulty with obtaining reliable
low frequency output while being capable of full-voltage 4
ohm output. Also, many earlier designs used fragile
epi-
base or triple diffused outputs, which for reliable per-
formance are poor mates for a current limiter protection
scheme. The
DC-3OOA
uses eight 150W silicon power
transistors per channel, chosen for their combination of
current, voltage and response characteristics to allow wide
operating safety margins. The safe operating area of each
transistor is specified by the manufacturer and individually
tested by CROWN. Their toughness allows the reliable use
of a current limiter which when rendered signal variable
permits larger power outputs than would be safely allow-
able with a current limiter of fixed type.
At subsonic frequencies, the SPACE control behaves as
a
VI
limiter and provides the increased protection needed at DC
to prevent destruction due to heat buildup in the half of the
output stage that is being driven.