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National Semiconductor
National Semiconductor creates energy-efficient analog and mixed-signal semiconductors as well as SolarMagicT power optimizers. Its PowerWise® products enable systems that consume less power, extend battery life, and generate less heat. National's leading-edge products include power management circuits, display drivers, audio and operational amplifiers, communication interface products and data conversion solutions. Headquartered in Santa Clara, Calif., National reported sales of $1.46 billion for fiscal 2009 which ended May 31, 2009
Development Board/Evaluation Kit: Reference design converts 90 VAC to 135 VAC input and drives 7 or 8 series-connected LEDs from 300 to 600 mA average current. The LM3445 switching frequency is set at 225 kHz. This 4-layer board uses the bottom and top layers for component placement. It can be modified to adjust LED forward... more
Product Catalog: National’s LED drivers offer dimming, protection, and thermal control suitable for a wide range of automotive lighting applications. These LED drivers provide a wide-input voltage range, constant current to regulate LED brightness, low-feedback voltage to minimize power dissipation, and zero... more
White Paper: The constant on-time (COT) control method used by constant-current buck regulators provides a balance between control over switching frequency and fast transient response. Normally this “quasi-hysteretic” control senses the input voltage and adjusts the on-time tON of the power MOSFET as needed to... more
White Paper: Portable battery sources are constantly challenged by the handheld applications’ increasing functionality and power demands. By better understanding the applications’ energy consumption, designers can produce energy-efficient solutions that will conserve battery life and provide a better end-user... more
White Paper: The exponential growth of LED lighting has ushered in a vast selection of integrated circuit devices to provide controlled power to LEDs. Switched-mode LED drivers have replaced power-hungry linear current sources as the standard. This article describes some basic LED theory and techniques used to... more
Application Note: LED lighting requires a constant-current source to take advantage of the output and color. The benefit of using a buck converter is how easily it can be turned into a constant-current source. Read about selecting, or possibly exclusing, an output capacitor when designing a buck regulator for... more
White Paper: Switch-mode power supplies employ various schemes to protect themselves and the load in overload conditions. Overload protection schemes can be broadly classified into two categories: non-recoverable protection schemes and self-recoverable protection schemes. Learn how hiccup-mode current limiting... more
White Paper: The design of the power architecture within the communications market consists of many trade-off s and design considerations, such as input and output voltage and current. This article addresses topology considerations with an overview of each topology's operation and the solution best implemented... more
Application Note: Explore National’s PowerWise® energy-efficient LED drivers, reference designs and subsystems for automotive, indoor/outdoor, and other general illumination applications. Learn about the “ABCs of LEDs” and how National’s WEBENCH® LED Designer online tool enables quick and easy selection and... more
Reference Guide: 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... more
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