Analog Devices LTC4266A-3 | Demoboard DC1815A-C

Description

Demonstration circuit 1815A features the LTC®4266A quad power sourcing equipment (PSE) controller, capable of delivering up to 90W of LTPoE++™ power to a compatible LTPoE++ powered device (PD). A proprietary detection/ classification scheme allows mutual identification between an LTPoE++ PSE and LTPoE++ PD while remaining compatible and interoperable with existing Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4266A feature set is a superset of the popular LTC4266. These PSE controllers utilize low RON external MOSFETs and 0.25Ω sense resistors which are especially important at the LTPoE++ current levels to maintain the lowest possible heat dissipation.

The LTC4266A is available in multiple power grades, allowing delivered PD power of 13W, 25.5W, 38.7W, 52.7W, 70W and 90W. The DC1815A has four variations DC1815A-A, DC1815A-B, DC1815A-C, and DC1815A-D which accommodate the four LTPoE++ power levels (Table 1).

Advanced power management features of the LTC4266A include: a 14-bit current monitoring ADC, DAC-programmable current limit, and versatile quick port shutdown. Advanced power management host software is available under a no-cost license. PD discovery uses a proprietarydual mode 4-point detection mechanism ensuring excellent immunity from false PD detection. The LTC4266A includes an I2C serial interface operable up to 1MHz. Optional I2C control is accessed on the DC1815A either with testpoints or a 14-pin ribbon cable for DC590B QuikEval™ GUI operation.

The LTC4266A is configurable on the DC1815A as an AUTO pin high, MID pin high, autonomous midspan power injector; input data from an existing network system is sent out, along with power, to a PD. The LTC4266A autonomously detects a PD, turns power on to the port, and disconnectsport power without the need for a microcontroller. OUTn LEDs indicate that port power is present. A single 55V supply is required to power the DC1815A. A simple LDO regulator circuit on the board powers the digital supply of the LTC4266A. A SHDN pushbutton for each portshuts down the respective port and disables detection. Pre-programmed masked shutdown ports are shut down with the MSD pushbutton. A RESET pushbutton resets the LTC4266A to its AUTO pin logic state. Ports shut down with the SHDN or MSD pushbutton must be re-enabled via I2C or a device reset with the AUTO pin high.

Features

REMARK:=T1,T2,T3,T4 Transformer usedRefer page no.10

More information

• Datasheet
• IC product information