Reference Design | National Semiconductor — Reference Designs for Power Management, LED Lighting, Altera & Xilinx FPGAs, Serial Digital Interface (SDI), High-Speed Signal Paths, Ethernet, and LVDS/SerDes
PowerWise Power-Saving Reference Designs
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Ambient Light Adaptive LED Driver
 Automatically adjust display brightness for changing ambient light conditions to provide a more viewable display with better contrast. The pulse-width modulation (PWM) dimming technique of National’s LED driver dims or brightens the display backlight in response to ambient light condition, greatly increasing battery life and improving the visibility of the display under different viewing conditions. A photodiode circuit measures ambient light and provides a signal for dimming the LEDs.
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High-Efficiency Portable Music Player Dock
 Showcasing PowerWise® power converters, battery charging circuitry, audio drivers and display interface circuits, this reference design saves even more power by initiating a power-saving mode when the PMP is unplugged from the wall power, automatically reducing the maximum brightness of the display as well as the output power of the audio drivers.
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Load-detecting Power Supply
 Help reduce wasted energy from inefficient AC/DC wall adapters that continue to run even without a load. This reference design utilizes a switching-mode power supply (SMPS) technology in place of linear regulators to drastically improve conversion efficiency. Additional circuitry "wakes up" the power supply only when a load is applied, reducing losses to just tens of milliwatts.
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CCFL to LED Conversion Power Supply
 Replace backlight cold cathode fluorescent (CCFLs) tubes with strings of light-emitting diodes (LEDs) for lower power consumption, better durability, smaller size, and brighter light that is more easily custom tailored to compensate for changes in ambient light.
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High-Performance SerDes Module with Easy FPGA Interface and Cable Detect
 For high-speed, high-performance serial data interfacing, National partnered with Avnet to implement a high-speed, power-saving serial interface for low-cost FPGAs. National’s DS32ELX0421/124 FPGA-Link SerDes combines high-speed data transfer flexibility with features such as automatic power down on loss of cable or input signal. The included FPGA firmware monitors this cable/signal loss indicator from the SerDes to turn off unnecessary system logic and other external components.
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 PowerWise Reference Designs Receive eg3 Editor's Tech Choice Award
Podcast - National's Rick Zarr speaks with eg3.com about new power management / low power technologies from National Semiconductor as well as PowerWise Reference Designs including: battery charging via solar, ambient light to adaptive LED driver, load-detecting power supplies, and more (links to eg3 site). |
Power Management
National's broad range of Power Management solutions is supported by reference designs, covering an broad array of applications and topologies. This includes output voltage range of -52V to +100V, for load currents of up to 30A.
WEBENCH Power Architect NEW!
- Design multi-tier, multi-rail power supplies in minutes
- RD-182 - LMZ14203/12003 20V/42V Vin, 3A Iout SIMPLE SWITCHER® Module Reference Design
- RD-181 - LMZ10504 5.5V Vin, 4A Iout SIMPLE SWITCHER Module Reference Design
- RD-171 +/- 5V Isolated, Low Noise Split Rail Generator (0.25A, 2.5W total)
- Very low noise differential power supply for +5V and -5V split rail systems
- Fully isolated, capable of 500V differential from Vin to Vout
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LED Lighting
Inductive LED driver reference designs are available for powering a wide variety of white LED types of multiple colors and configurations with high power efficiency. Many designs offer high output current, for multiple LEDs in series, LED flash, or high-power LEDs.
RD-173 - National Semiconductor and Nuventix LED Bulb Replacement Reference Design
- Complete thermal and electronic drive solution for LED bulb replacement applications
- Nuventix SynJet® Cooling module provides thermal solution
- NEW! National Semiconductor LM3429 LED driver and LM2842 voltage regulator provide electronic drive solution
- Get more info
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Off-Line TRIAC Dimmer LED Driver Reference Design - RD-172
This reference design converts 90 VAC to 135 VAC input, and drives seven, or eight series connected LED's from 300 to 600 mA average current. The LM3445 switching frequency is set at a nominal 225 kHz. |
National offers the Power-Expert software tool, power design guide, reference designs, and application notes to to help them easily select and implement the best power management solutions for their Altera FPGA or CPLD designs.
Power solutions also include a downloadable power design guide for Xilinx FPGAs and application notes to help guide the engineer towards a typical solution for their Xilinx design.
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Analog Signal Path (ADC+Amp+Clock)
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High-IF Sub-sampling Receiver Subsystem with large/small signal SNR of 71/72.7 dBFS and SFDR greater than 80/92 dBFS - ADC16DV160 |
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Low IF Receiver Subsystem with large/small signal SNR of 75.8/78 dBFS and SFDR greater than 84/94 dBFS - ADC16V130 |
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Lowest Power 8-bit 3 GSPS Data Acquisition System - ADC083000 |
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Low Intermediate Frequency Receiver System - ADC14DS105 |
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High Intermediate Frequency Receiver System - ADC14V155 |
Serial Digital Interface
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