DC3137A

Demonstration circuit DC3137A features floating, high voltage active rectifier controller LT4322 in a full-wave rectifier configuration. It is suitable for applications that require high voltage line rectification with DC o/p's up to 170V. While components were chosen to optimize performance at 60Hz, LT4322 is capable of operating at frequencies up to 100KHz. LT4322 drives an N-channel MOSFET to perform functionally like a diode but with much lower power dissipation. This topology eases thermal constraints & increases usable o/p voltage. An N-channel topology has multiple benefits over P-channel topology including lower RDS(ON), smaller footprint, lower cost and wider selection of MOSFET. In this full-wave rectifier, 4x LT4322 circuits replace four diodes. Only few essential components are required to operate each LT4322: a single N-channel MOSFET(M1x), capacitor(C1xB), capacitor(C5x) and in applications where peak-to-peak i/p voltage exceeds 60V, N-channel depletion mode MOSFET(M2x).

• Fully featured evaluation board for the LT4322
• High voltage full-wave rectification
• Ideal diode bridge
• Schottky diode bridge replacement

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