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Overview
| Topology | Flyback Converter |
| Input voltage | 37-57 V |
| Output 1 | 3.3 V / 6.8 A |
Description
Demonstration circuit 2046A-A is a PoE powered device(PD) with an isolated power supply using synchronousflyback topology, featuring the LT®4276 and ideal diodebridge controller (LT4321).The LT4276 provides IEEE802.3af (PoE, Type 1),IEEE802.3at (PoE+, Type 2), and LTPoE++™ PD interfacingand power supply control. When the PD is fully powered,the PD interface switches power over from the powersourcing equipment (PSE) to the switcher through anexternal, low resistance, high power N-channel FET. Thehighly integrated LT4276 controls a high power, smallsizedpower supply that utilizes a highly efficient flybacktopology with synchronous rectification. The LT4321provides further efficiency improvement by minimizingthe bridge losses.The DC2046A-A supplies a 3.3V output at up to 6.8A. Italso demonstrates the use of an optional auxiliary powersupply input of 48V. When present, the auxiliary supplybecomes the dominant supply over PoE to provide power.