LT4294HMS#PBF

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Power over Ethernet (PoE) Controllers provide a regulated power supply to the electrical devices connected to them. LT4294HMS#PBF (LT4294) is a single-stage, 12mm x 12mm x 4.5mm, flyback PoE controller IC, hence, it is suitable for applications with small form factor. Some examples of such applications are consumer electronics, medical equipment, industrial equipment, Point of Sale (POS) terminals, and automotive systems.

Overview of LT4294 PoE Controller

LT4294 has an ultra-wide, 4:1 input range input of 10.6V to 44V and is specifically designed for EthaneTM PoE system, with an internal 4.25MHz oscillator driven switching frequency. The device is extremely efficient with a primary-side-regulation flyback topology, and makes use of the external current sense resistor only.

Features and Benefits

• Integrated High Voltage MOSFET with 1.8mΩ of RDS(ON)
• External CSP feedback loop with internal compensation
• Integrated soft-start
• Integrated OVP, OCP and SCP
• Integrated FluxLink feature for optimal light-load efficiency
• Integrated average current limit

LT4294 Application Field and Working Principle

The LT4294 PoE Controller can be applied to various fields. Some of the most common applications where LT4294 can be found include industrial applications, network equipment, PoE peripherals, LED lighting, telecom, and other power-efficient applications.

The working principle behind LT4294 is based on two basic concepts. Firstly, the controller produces an output voltage by regulating the duty cycle of the switching MOSFET. The second concept is the feedback loop which is required to keep the output voltage in regulation. This feedback loop includes a voltage reference, an error amplifier, an optocoupler, an external resistor divider and an internal compensation network.

Conclusion

In conclusion, the LT4294 PoE Controller is a very effective power supply solution for various applications with small form factor that require high voltage input. It is capable of regulating the output voltage through its feedback loop and is also equipped with multiple safety features. It does not require an external compensation network and the external clock is easily adjustable. The LT4294 is an ideal choice for power-efficient applications that require a reliable power supply.

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