]
Balanced Current Amplifier
©
1998 Crown International, Inc.
BCA™ and Balanced Current Amplifier™ are trademarks and Crown
®
is
a registered trademark of Crown International, Inc.
exhibit total ripple cancellation. In standard PWM class-
D designs which use interleaving there are (N+2)/2 ripple
nulls. Thus N/2 more ripple nulls result from OCIA de-
sign.
Power converters that use OCIA design principles can
be used for both inverter and rectifier applications. This
is the natural consequence of being a full four-quadrant
power converter. Much more could be said, however it
is not the intent of this document to be a textbook on
state-of-the-art amplifier design.
GRS 12-20-96
Negative-Programmed Output
The modulator for the basic Crown BCA power stage is
simpler than one might at first imagine. Having twice the
standard amount of resultant information, it has two high-
speed comparators driven from three signals, Verr, -Verr
and Vtr. The same triangle waveform source can be used
by both comparators.
Guaranteed Excellence
]
Crown International, Inc.
PO Box 1000 Elkhart, IN 46515-1000
Ph. 800-342-6939/219-294-8200
Fax. 219-294-8301
FAST FACTS. 800-294-4094
www.crownaudio.com
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