Analog Devices LT8440 | Demoboard EVAL-LT8440-AZ

Description

The EVAL-LT8440-AZ evaluation circuit features the LT8440 used in a load power port of an intrinsically safe field device. It can regulate and limit the power drawn by the port according to the Ethernet Advanced Physical Layer (Ethernet-APL) standard. The EVAL-LT8440-AZ is designed with three LT8440s in series to meet the triple redundancy requirement of intrinsic safety Ex ia for class A field devices, but it can be configured to work with a lower LT8440 count. See the Redundancy of LT8440 section for more details.

Features

• 650mW Power Limit for Intrinsic Safety Thermal
• Rating when Line Voltage ≤ 18.5V
• 35mA Current Limit if Line Voltage > 18.5V
• 55mA Current Limit for APL Class A Devices
• Shunt Regulator for Mitigating Load Changes
• Guaranteed 20mA Rectifier Current for Signal Integrity
• Guaranteed to deliver full 500mW APL power to the load
• 6V to 36V Input Voltage
• Integrated Current Sense Resistor
• Polarity Insensitive Line Voltage Detection
• 8-Lead SOIC Package with Exposed Pad

Typical applications

• Industrial Ethernet, Advanced Physical Layer, Current Limiting

More information

• Datasheet
• IC product information