Reference Circuit 6124

PoE-Powered LED Lighting Reference Circuit



This reference circuit powers an LED light bulb using power-over-ethernet (PoE) and control through a Bluetooth® module. The bulb can be wirelessly turned on/off and dimmed with 9 levels of brightness using Bluetooth. The circuit comprises a MAX5969A powered device (PD) controller, a MAX16832 LED driver with an integrated MOSFET, a MAX15062 synchronous step-down DC-DC converter, an 8-bit microcontroller, and a Bluetooth module. This reference design includes a schematic, PCB files, and a bill of materials.

Features

  • Proven printed circuit board (PCB) layout
  • Proven component parts list
  • Controllable with Bluetooth or Wi-Fi® module

PoE-powered LED lighting reference circuit

Block Diagram

PoE-powered LED lighting block diagram.

Applications Information

The MAX5969A receives power from the power-sourcing equipment (PSE) and provides 48V (nominal) of DC power to the MAX16832 LED driver and the MAX15062 DC-DC converter. The DC-DC converter powers the 8-bit microcontroller and the Bluetooth module. The microcontroller takes user input through the Bluetooth module and converts it to a PWM-dimming signal and feeds it to the LED driver.

The board accommodates footprints for an HM-12 BT module, a BL-600 BT module, and an ESP8266 Wi-Fi module. HM-12 control software for both Android and iOS is available. Search for “PoE LED” in the appropriate app store.

Hardware Files

Schematic
Bill of Materials (BOM)
PCB CAD files


 
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MAX15062
60V, 300mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converters

  • Eliminates External Components and Reduces Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation

MAX5969A
IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated Power MOSFET

  • IEEE 802.3af/at Compliant
  • 2-Event Classification
  • Simplified Wall Adapter Interface

MAX16832
2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense

  • Cost-Effective Solution for a Wide Range of LED Lighting Applications
  • Minimal Component Count Saves Cost and Space
  • Protection Features and Wide Operating Temperature Range Improves Lighting Fixture Reliability