Download Reference Design Document| Input Type | VIN (MIN) (V) |
VIN (MAX) (V) |
IOUT (A) |
Single/Multiple Output |
VOUT (V) |
POUT (W) |
Isolated/Non-Isolated | Topology |
|---|---|---|---|---|---|---|---|---|
| DC | 30 | 60 | 0.6 | Single | 12 | 7.2 | Isolated | Flyback |
Power over Ethernet (PoE) is a technology that allows network cables to deliver power to a powered device (PD) through power-sourcing equipment (PSE) or midspan, and has many advantages over traditional methods of delivering power. PoE allows power and data to be combined, removing the need for altering the AC mains infrastructure and can be installed by non-electricians. PoE is an intelligent system designed with protection at the forefront, preventing overload, underpowering, and installation errors, while allowing simple scalability and reliability.
The MAX17690 implements an innovative algorithm to accurately determine the output voltage by sensing the reflected voltage across the primary winding during the flyback time interval. By sampling and regulating this reflected voltage when the secondary current is close to zero, the effects of secondary-side DC losses in the transformer winding, the PCB tracks, and the rectifying diode on output voltage regulation can be minimized. The MAX17690 also compensates for the negative temperature coefficient of the rectifying diode.
This document describes the hardware shown in Figure 1. It provides a detailed systematic technical guide to designing a DC-DC discontinuous conduction mode (DCM) flyback using Maxim’s MAX17596 current-mode controller. The power supply has been built and tested, details of which follow later in this document.
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