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LT4320-Slide2

The passive diode bridge is a simple circuit to full-wave rectify AC inputs and polarity-correct DC voltages. However, the two diodes in the input-to-output path dissipate power, about 1.2W for every 1A. The radiated heat raises the ambient temperature, complicating thermal design and requiring board area to be reserved for heat sinking purposes, increasing the circuit’s size and cost. With low voltage inputs, the two inherent diode drops totaling 1.2V take a significant bite out of the operating voltage.

PTM Published on: 2013-11-25