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Higher Power Density Solutions for Smaller Form Factors
- Industry's most integrated family of full-bridge controllers with all four primary-side MOSFET drivers and synchronous rectifier control signals
- Advanced topologies such as full-bridge, phase-shifted full-bridge, active clamp, and half-bridge
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- Small footprint, high-speed half-bridge gate drivers capable of operating with supply voltages up to 100V
- High performance rail-to-rail amplifiers
- Precision, low noise shunt voltage references
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Merchant Power Solutions
(pdf)
Product Brief - LM5113 Gate Driver for Enhancement-Mode GaN FETs
(pdf)
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- Independent high and low TTL logic inputs
- 1.2A / 5A peak source/sink current
- High-side floating bias voltage rail operates up to 100V
- Internal bootstrap supply voltage clamping
- Split outputs for adjustable turn-on/turn-off strength
- 0.5Ω / 2Ω pull-down/pull-up resistance
- Fast propagation times—30 ns typical
- Drives EPC eGAN® FETs Learn more...
- Product Info:
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The LM5113 is the only integrated driver solution available for EPC eGAN® FETs. Learn more... |
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LM5045/46
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Merchant Power Module Applications
| Power Module Form Factor |
Power Level |
Ideal Topologies |
National Switching Controllers |
| 1/2 Brick |
>500W |
Interleaved Forward, Cascade |
, |
| 1/4 Brick |
300 to 400W |
Cascade, Half-Bridge, Full-Bridge |
, , , , , |
| 1/8 Brick |
100 to 250W |
Active Clamp Forward, Half-Bridge, Full Bridge |
, , , , , , |
| 1/16 Brick |
<100W |
Active Clamp Forward |
, , |
 Power over Ethernet (PoE) integrates data and power over standard LAN infrastructures. Since PoE devices do not require wall-mounted power supplies, overall system costs are lower. For IP telephony, uninterruptible power supplies (UPS) guarantee higher reliability and less susceptibility to power surges, theft, interruption, or disconnection. Worldwide usage of the RJ-45 power connector ensures global compatibility of PoE devices. For wireless access-point applications, these systems do not require AC power sources, power lines, or outlets. PoE-enabled devices offer superior management flexibility with remote power up/down capability.
National Semiconductor provides innovative and robust Power Over Ethernet (POE) single and integrated solutions for the receiving (PD) side of the IEEE 802.3af application.
National's PD Interfaces for PoE
- IEEE 802.3af Compliant with Power over Ethernet Consortium Test Data (Interoperability Clause 33, PD Performance)
- Support for Isolated or Non-Isolated Applications
- Robust Auxiliary Power Support Including Aux Dominant Interface
- Programmable Current Limit and UVLO for High Power PoE Applications
IEEE 802.3af
The IEEE 802.3af standard for delivering power over Cat-5/5E cables eliminates the need for AC-adapters for equipment plugged into the Ethernet. A PoE system essentially consists of two major components; the Power Sourcing Equipment (PSE), which delivers power, and Powered Devices (PD), which receive and use the power. A PSE will only deliver power to the load if it detects a valid signature resistance, which distinguishes a compliant PD from a device that cannot receive power. It does this by applying a small current-limited voltage to the cable and checks for the presence of a 25k ohm resistor in the remote device. Only if the resistor is present is the full 48V is applied, but this is still current-limited to prevent damage to cables and equipment in fault conditions. Once the PD receives power, it must also convert the –48V PoE to the required power supply voltage.
Applications
Power Over Ethernet technology allows IP telephones, wireless LAN Access Points, webcams and many other appliances to receive power as well as data over existing LAN cabling.
Some Popular Applications for PoE include:
- VoIP (Voice over Internet Protocol) telephones
- IEEE802.11 Wireless LAN Access Points
- Bluetooth Access Points
- Web cameras
- Vending machines
- Gaming machines
- Retail point of information systems
- EPOS systems
- Building access control systems including RFID Card Readers and Lock Activators
- Time and attendance systems
- Battery chargers for mobile phones and PDAs
- Electronic musical instruments
Power over Ethernet (PoE) Controllers
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