Description

The NCL31010 is a member of the onsemi Power over Ethernet

Powered Device (PoE−PD) product family and integrates an IEEE

802.3bt PoE−PD interface controller, a dual step−down converter and a

buck convertor LED driver. The NCL31010 incorporates all the

required functions for operation within a PoE system such as detection,

classification and current limiting during the inrush phase. The

NCL31010 contains synchronous step−down DC/DC converters for the

main 3.3 V system supply as well as an auxiliary supply. In addition, the

NCL31010 also integrates a current mode buck DC/DC controller

designed to operate as a LED driver. The LED driver supports both

PWM dimming and high−bandwidth analog dimming.

The NCL31010 supports high−power applications (up to 90 W PoE).

Features

• Fully Supports IEEE 802.3af/at and 802.3bt Specifications

• Assigned Power Level Up to 90 W

• Proprietary 100 W+ Applications

• Supports Autoclass

• HV Maintain Power PWM Output (MPS)

• Integrated 3.3 V Buck Convertor

• Integrated Adjustable Buck Convertor 2.5 − 24 V

• Integrated High Efficiency Buck LED Driver

• Adjustable Switching Frequency 44.4 kHz to 1 MHz

• Deep Dimming to Zero with Accuracy of 0.1 Using Internal

Precision 2.4 V Reference

• Best in Class Linearity

• High Modulation Bandwidth (~50 kHz)

♦ Visual Light Communication Capable

♦ Yellow−Dot Compliant

• Internal DIM DAC for Independent LED Control During

Micro−controller Re−flashing (Warm Boot)

• Low EMI Reference Design

• I2C/SPI Interface (NCL31010I/NCL31010S)

• High Accuracy Diagnostic Functions to Measure Voltages/Currents

• Protection against LED Shorts & Opens

• LED Over/Under Voltage & Over Current Protection

• Chip Over Current Protection

• Chip & LED Over Temperature Protection

• Junction Temperature Range of −40°C to +125°C

• Available in 48−pin QFN 7x7

• These Devices are Pb−Free and are RoHS Compliant