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特性
- 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 Detectio
- 8-Lead SOIC Package with Exposed Pad
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The LT8440 is a power conditioner for intrinsically safe, industrial ethernet ports in hazardous or explosive environments. The internal pass transistor is normally fully enhanced to deliver power to the load efficiently. In case of load circuit failures, the FET is modulated to limit the power to less than 650mW if line voltage ≤ 18.5V or less than 35mA if line voltage > 18.5V. The internal shunt transistor draws current parallel with the load up to the 500mW minimum guaranteed for Class A load power ports in compliance with Advanced Physical Layer (APL) standard or to 20mA minimum guaranteed if line voltage > 18.5V. The line voltage is sensed with two input pins that are insensitive to polarity, which can be connected in front of the port rectifier and incorporate the rectifier power consumption in the limitation of total power. The line current is measured as a voltage across the internal sense resistor, and the shunt current and the current limit are automatically adjusted for line voltage.
The LT8440 is packaged in an 8-lead SOIC with pin spacing that satisfies the device under coating specification so that shorts from pin to pin are countable faults when the circuit is examined for intrinsic safety at the highest levels of protection.
APPLICATIONS
- Industrial Ethernet
- Advanced Physical Layer
- Current Limiting
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LT8440
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| 产品型号 | 引脚/封装图-中文版 | 文档 | CAD 符号，脚注和 3D模型 |
|---|---|---|---|
| LT8440RS8E#PBF |
8-Lead SOIC (Narrow 0.15 Inch w/ EP)
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| LT8440RS8E#TRPBF |
8-Lead SOIC (Narrow 0.15 Inch w/ EP)
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- LT8440RS8E#PBF
- 引脚/封装图-中文版
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8-Lead SOIC (Narrow 0.15 Inch w/ EP)
- 文档
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HTML
Material Declaration
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HTML
Reliablity Data
- CAD 符号，脚注和 3D模型
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Ultra Librarian
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SamacSys
- LT8440RS8E#TRPBF
- 引脚/封装图-中文版
-
8-Lead SOIC (Narrow 0.15 Inch w/ EP)
- 文档
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD 符号，脚注和 3D模型
-
Ultra Librarian
-
SamacSys
软件和型号相关生态系统
评估套件 1
EVAL-LT8440-AZ
Power Conditioner for APL Field Devices
产品详情
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.
The evaluation circuit is also equipped with filters and protection components to meet the Ethernet-APL and intrinsic safety standards, including IEC60079-11 and IEC60079-47 standards. Communication signal integrity is well preserved on this evaluation circuit, allowing seamless link up between 10BASE-T1L devices.
The EVAL-LT8440-AZ board is designed to operate from 9V to 17.5V input voltage. Across the input voltage range, the LT8440 draws current in parallel with the load up to the 500mW minimum guaranteed for Class A load power ports in compliance with Advanced Physical Layer (APL) standards. In case of load circuit failures, the evaluation board also limits input power below 650mW. The LT8440 shunts current even at no load to ensure at least 20mA input current during normal operation, which is required by APL specification for signal integrity.
Design files for this circuit board are available at Product Evaluation Boards and Kits | Design Center | Analog Devices.
资料
