Overview
The NCP1090DRG, part of ON Semiconductor’s Power over Ethernet (PoE) Powered Device (PoE-PD) product family, integrates an IEEE 802.3af certified interface controller. This component is designed to support the necessary functions for PoE applications, including detection, classification, under voltage lockout, inrush and operational current limits. The NCP1090DRG is fabricated in a robust high voltage process, incorporating a rugged vertical N-channel DMOS, making it suitable for demanding environments and capable of withstanding harsh conditions such as hot swap and cable ESD events.
Key Specifications
| Parameter | Min | Typ | Max | Units | Conditions |
|---|---|---|---|---|---|
| Input Supply Voltage (VPORT) | 0 | - | 57 | V | VPORT = VPORTP - VPORTN |
| Inrush Current Limit | 75 | 120 | 170 | mA | Measured at RTN-VPORTN = 3 V |
| Operational Current Limit | 425 | 500 | 575 | mA | Current limit threshold |
| Pass-switch Rds-on | - | 0.5 | 1 | Ω | Measured with I(RTN) = 200 mA |
| Industrial Temperature Range | -40 | - | 85 | °C | Full operation up to 125°C Junction Temperature |
| UVLO Default Turn On Voltage | 37 | 40 | - | V | VPORTP rising |
| UVLO Default Turn Off Voltage | 29.6 | 31 | - | V | VPORTP falling |
Key Features
- Fully supports IEEE 802.3af specifications
- Programmable classification current
- Adjustable under voltage lock out (NCP1091 only)
- Open-drain power good indicator
- 130 mA inrush current limit and 500 mA operational current limit
- Pass switch disabling input for rear auxiliary supply operation (NCP1092 only)
- Over-temperature protection
- Industrial temperature range: -40°C to 85°C with full operation up to 125°C junction temperature
- 0.5 Ω hot-swap pass-switch
- Vertical N-channel DMOS pass-switch offers the robustness of discrete MOSFETs
Applications
The NCP1090DRG is designed for use in various industrial and security applications, including but not limited to:
- Industrial devices requiring robust PoE solutions
- Security systems such as IP cameras and access control devices
- Networked sensors and IoT devices
- Applications requiring auxiliary supply options
- Combination with stepper motor drivers, CAN bus drivers, and other high-voltage interfacing devices
Q & A
- What is the NCP1090DRG and what does it do?
The NCP1090DRG is an integrated IEEE 802.3af PoE-PD interface controller that supports the necessary functions for Power over Ethernet applications, including detection, classification, under voltage lockout, and current limits.
- What are the key specifications of the NCP1090DRG?
Key specifications include input supply voltage up to 57V, inrush current limit of 120mA, operational current limit of 500mA, and an industrial temperature range of -40°C to 85°C.
- What are the main features of the NCP1090DRG?
Features include full support for IEEE 802.3af, programmable classification current, adjustable under voltage lockout, open-drain power good indicator, and over-temperature protection.
- What types of applications is the NCP1090DRG suitable for?
The NCP1090DRG is suitable for industrial devices, security systems, networked sensors, IoT devices, and applications requiring auxiliary supply options.
- How does the NCP1090DRG handle under voltage lockout?
The NCP1090DRG incorporates a fixed under voltage lockout circuit and the NCP1091 variant offers a programmable under voltage lockout.
- What is the purpose of the power good indicator in the NCP1090DRG?
The power good indicator signals the end of the DC-DC converter input capacitor charge and the enabling of the operational current limit.
- How does the NCP1090DRG manage inrush and operational current limits?
The inrush and operational current limits are defined by external resistors connected between INRUSH and VPORTN, ensuring smooth charge of large DC-DC converter input capacitors.
- Does the NCP1090DRG support auxiliary supplies?
Yes, the NCP1092 variant provides an auxiliary pin for applications supporting auxiliary supplies, allowing the auxiliary supply to be dominant over the PoE supply.
- What is the thermal shutdown feature in the NCP1090DRG?
The NCP1090DRG includes a thermal shutdown feature that disables the device in case of high junction temperature, returning to normal operation once the temperature falls below the threshold.
- What is the package type and pin configuration of the NCP1090DRG?
The NCP1090DRG is available in SOIC-8 and TSSOP-8 packages with specific pin configurations for each variant.
