POWER_TRANSISTOR_DISSIPATION

Published:2009/7/14 5:36:00 Author:May | From:SeekIC

Circuit protects power transistors in various combinations without limiting capabilities of AF amplifier when driving reactive loudspeaker load. With continuous signal drive into normal load, R1 draws current from C1 through D1, in opposition to R5. This gives drops of about 0.12 V across C1 and C2, allowing full drive. With short-circuited load, however, capacitor drops increase to about 0.55 V, thereby limiting average current in each output transistor to about 1.1 A. Diodes D5 and D6 are not critical, and simply prevent current flow from base to collector of transistors. -M. G. Hall, Amplifier Output Protection, Wireless World, Jan. 1977, p 78.



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