U.S. National Semiconductor launched six new PowerWise high energy efficiency subsystem reference design

These reference design can reduce the power consumption of the system, reduce the heat generated during the operation, long battery life, suitable for different applications.

November 12, 2008 - China -- National Semiconductor Corporation Ns (National Semiconductor Corporation) (New York stock exchange code: NSM) launched 6 new design process PowerWise reference design can not only simplify the product, but also can reduce the power consumption of the system, reduce the heat generated during the operation, and prolong the service life of batteries. These PowerWise reference design can not only with a variety of different high energy efficiency chips with, but also according to the system operation of the dynamic adjustment of energy consumption, thereby reducing system energy consumption and reduce heat dissipation.

That several PowerWise reference design each contains the application circuit diagram, bill of material (BOM), line layout, design documents and firmware, can use Verilog or VHDL language to write the source code of FPGA synthesis. Suitable for portable electronic products, lighting systems, solar power generation equipment, industrial systems, medical equipment, communication network base station equipment and testing and measuring instruments, such as a variety of different applications. For further information about these reference designs, visit the www.national.com/refdesigns web page.

Lead / acid solar battery charger

This design can ensure that the solar cell can be more efficient to charging current light into lead-acid battery, solar power system engineers can use this reference to design and develop more efficient. In addition, the design can also be used to compensate for the changes in temperature and sunlight intensity, to ensure that in any case the photoelectric conversion process can give full play to its efficiency. The design uses two switching stages: the first stage uses the SEPIC conversion system provides the output voltage, the voltage is responsible for monitoring the solar panels, and track the input voltage of the solar panel at different temperatures; the second level is responsible for the conversion of output voltage of the first level determination, and the input voltage will increase.

Portable music player high efficiency

The reference design using the PowerWise power converter, battery charging circuit, audio driver and display interface circuit, so that engineers can design energy saving mode for the system, then to ensure that the portable media players from the AC outlet unplug, will automatically lower the maximum brightness of the display, and reduce the output power of the audio driver.

Using LED to replace the power supply CCFL fluorescent tube

Using the reference design of LED series multi string together to replace the CCFL fluorescent tube as the light source of the backlight system, the utility model has the advantages of lower power consumption, smaller volume, longer life, light, but also according to changes in ambient light easily for picture brightness compensation. This design uses the constant current LED driver two series, each series of 6 LED 3 channel, the LED driver in the function can be regarded as a boost converter because the drive operation can use 12V power supply output voltage from 21V to 27V. Another feature of this design is the use of photodiodes to ensure that the brightness of the display can be changed with the ambient light in proportion to increase or decrease. In other words, in any light, users can easily read the contents of the display.

Can adjust the light environment with flexible LED drive

The advantages of this reference design is a backlight system can automatically adjust the screen brightness according to the ambient light changes, to ensure that the screen has high brightness contrast and the image is more clear and bright. National Semiconductor LED driver uses pulse width modulation (PWM) dimming control technology, can adjust the brightness of the display backlight system due to changes in ambient light. This will not only extend the battery life, but also to ensure that in any case of light and dark, the display screen is equally clear and bright. In addition, the built-in photodiode circuit can also measure ambient light, thereby providing a control signal to regulate the LED dimming.

High performance serial / built-in FPGA interface and cable detection function deserializer module

National Semiconductor and Avnet companies work together, for the Xilinx Spartan-3 FPGA chip with low cost of a comprehensive reference design and development: in the FPGA chip with low power high speed serial data interface. American National Semiconductor FPGA-Link serial / deserializer with a high degree of flexibility, not only can support high-speed data transmission, but also the loss of the cable or the input signal, but also automatic power off. In addition, the built-in FPGA firmware can monitor the serial / deserializer cable / signal loss indication, and even turn off the non essential system logic circuits and other external components in order to significantly save system power consumption.

Can detect power supply load

Even in the case of no load, the part of the built-in low efficiency of AC / DC power socket on the wall still continue to supply. In order to ensure that this type of socket to reduce energy waste, this reference design uses a switched mode power supply (SMPS) technology to replace the linear regulator, in order to significantly improve the efficiency of power conversion. In addition, this design is also a wake-up circuit to ensure that only when there is a load, wake up power supply system, so the power consumption can be reduced to less than 100mW.

National Semiconductor online picture data room equipped with these reference design of high definition photos available for download, the picture information room at http://www.