Overview
The NCP1095DBR2, produced by onsemi, is a Power over Ethernet (PoE) Powered Device (PD) interface controller that complies with IEEE 802.3af/at and 802.3bt standards. This component is designed to enable devices to receive power through an Ethernet connection, supporting high-power applications up to 90 W. It integrates all necessary functions for PoE operation, including detection, classification, and current limiting during the inrush phase. The NCP1095DBR2 is particularly useful in applications where power can be supplied either by PoE or an auxiliary wall adapter.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Condition |
|---|---|---|---|---|---|
| Detection Resistance | 23.7 | 26.3 | - | kΩ | 1 V ≤ VPORT ≤ 10.1 V |
| Inrush Current | 85 | 110 | 135 | mA | - |
| Power Good Threshold Voltage | 0.7 | 0.8 | 0.9 | V | RTN–VPN falling |
| PGATE Power Good Threshold Voltage | 6.9 | 8.5 | 10.0 | V | PGATE−VPN rising |
| Junction Temperature Range | -40 | - | 125 | °C | - |
| Package Type | - | - | - | TSSOP-16 | - |
| Compliance | - | - | - | Pb-Free, RoHS Compliant | - |
Key Features
- Fully supports IEEE 802.3af/at and 802.3bt specifications
- Supports up to 5-event physical layer classification
- Assigned power level up to 90 W
- Autoclass support
- 110 mA typical inrush current limiting
- Open drain power good indicator
- Support for short Maintain Power Signature (MPS)
- Pass switch disabling input for rear auxiliary supply operation
- Overcurrent and overtemperature protection
- Auxiliary supply detection pin for dual power source applications
Applications
The NCP1095DBR2 is suitable for a wide range of applications that require Power over Ethernet, including but not limited to:
- IP Phones and Video Phones
- Wireless Access Points (WAPs) and Wi-Fi Routers
- IP Cameras and Surveillance Systems
- Network Attached Storage (NAS) Devices
- Industrial Control Systems and IoT Devices
Q & A
- What is the maximum power level supported by the NCP1095DBR2?
The NCP1095DBR2 supports power levels up to 90 W, compliant with IEEE 802.3bt standards. - What are the key features of the NCP1095DBR2?
The key features include full support for IEEE 802.3af/at and 802.3bt, up to 5-event physical layer classification, autoclass support, inrush current limiting, and overcurrent/overtemperature protection. - How does the NCP1095DBR2 handle inrush current?
The NCP1095DBR2 limits inrush current to 110 mA typical by controlling the charging of the port capacitance through an external sense resistor. - What is the purpose of the auxiliary supply detection pin?
The auxiliary supply detection pin allows the NCP1095DBR2 to be used in applications where power can be supplied by either PoE or a wall adapter. - What is the junction temperature range of the NCP1095DBR2?
The junction temperature range is from -40°C to +125°C. - Is the NCP1095DBR2 RoHS compliant?
Yes, the NCP1095DBR2 is Pb-Free and RoHS compliant. - How does the classification process work with the NCP1095DBR2?
The classification process involves the NCP1095DBR2 responding to the Power Sourcing Equipment (PSE) with class-mark events determined by resistors connected to the CLA and CLB pins. - What is the role of the power good indicator (PGO) in the NCP1095DBR2?
The PGO output is used to enable/disable the main DC/DC converter and significant loads, ensuring proper system startup and preventing excessive stress on the pass switch during inrush. - Can the NCP1095DBR2 distinguish between 802.3af/at and 802.3bt compliant PSEs?
Yes, the NCP1095DBR2 can distinguish between 802.3af/at and 802.3bt compliant PSEs using a 1 nF capacitor between the COSC and VPN pins. - What is the significance of the NCM and NCL outputs in the NCP1095DBR2?
The NCM and NCL outputs provide information about the power level assigned by the PSE during classification, which is particularly relevant for PDs requesting Class 4 or higher.
