Short-circuit protection and over-current modulation to maximize

Details Short-circuit protection and over-current modulation to maximize Short-circuit protection and over-current modulation to maximize

1998-02-25

1999-10-26

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including protection means

330 10, 330251, H02H 720, H03F 338, H03F 3217

Patent

active

059735694

ABSTRACT:
A Class D amplifier includes a tracking circuit and a regulation circuit to provide efficient, accurate protection against excessive current flow in the power FET's of the amplifier output stage. The FET currents flowing in the output stage are mirrored across tracking resistors by the tracking circuit. The resultant voltage drops are compared to reference voltages to detect over-current situations. By mirroring scaled-down versions of the output currents, power consumption in the tracking circuit is minimized. When an over-current situation is detected, the regulation circuit modulates the duty cycle of the signal input to the output stage until the FET currents fall to acceptable levels. If two over-current indications occur during a single clocking cycle of the pulse-width modulator of the amplifier, the regulation circuit shuts off the amplifier to protect against short-circuit damage.

REFERENCES:
patent: 5510753 (1996-04-01), French
patent: 5805020 (1998-09-01), Danz et al.

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