Low Forward-Drop Rectifier(LM393)

A TMOS power FET (Q1) and a LM393 comparator provide a high-efficiency rectifier circuit. When VA exceeds VB, U1′s output becomes high and Q1 conducts. Conversely, when VB exceeds VA, the comparator output becomes low and Q1 doesn’t conduct.

 Low Forward-Drop Rectifier(LM393)

The forward drop is determined by Q1′s on resistance and present I. The MTH40N05 has an on resistance of 0.028 Ohm; for I = 10 A, the forward drop is much less than 0.3 V. Usually, the most effective Schottky diodes do not even start conducting beneath several hundred mV.

S:electronicsuite.com


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