Design of over-current protection circuit for digital power amplifier

Abstract

This work shows a modified excess current preservation circuitry for digital power amplifier. Excess current is a condition when a greater than required current occurs, which will be dangerous for our instrument. This preservation circuitry is useful to cut off the output buffer when two output pins short-circuit to Vcc, short-circuit to Gnd or short-circuit to one another. Circuit has maximum output power of 2.85Watt and efficiency of 95% when load is 4Ohm when Vcc is 5Volt. This circuitry has a threshold of 160mA.