TI's power management of small white LED solutions

TI's power management of small white LED solutions

A few days ago, Texas Instruments (TI) announced the launch of a range of up to five serial white diode (LED) power synchronous boost converter, and further enhanced TI for small laptop battery, apple battery-powered handheld devices to provide high-level display support capacity. The 1.5 mm x 1.5 mm ultra-small chips (IC) so that the design of portable devices will be able to implement the smallest inductor-based solution to the smart phone, PDA, digital cameras and other handheld electronic devices for efficient white light LED power and control its brightness.

TPS6106x series of new professional DC / DC converters can not only support the 2.7V to 6V input voltage, and up to 3,4 and 5 serial LED power supply. These converters use a micro-chip-scale package, and minimize the number of external components required, so that power supply circuit solution than many non-inductor-based solution for a smaller charge pump. TPS61060, TPS61061 and TPS61062 devices integrate a current of 400 mA the MOSFET and synchronous rectifier, eliminating the external Schottky diode serial trouble. In addition, 1 MHz fixed switching frequency converters can be used to make smaller, low value (low-& # 118alue) external components, such as the 10 uH inductor and output capacitors of 220 nF.

External current sensing resistor to set the constant-current LED. TPS6106x special input devices can host microcontroller through the use of general-purpose input / output pins to achieve simple, a wide range of digital brightness control. Digital dimming technology can be based on the feedback voltage regulator reference voltage step size adjustment. In addition, by pulse width modulation (PWM) signal applied to the chip to start pin, or through the introduction of the analog signal input to the feedback, to control LED brightness.

In order to achieve maximum security and protection, TPS6106x using integrated over-voltage, short circuit and thermal shutdown sensor. Each device with the largest number of serial LED corresponding to the different over-voltage protection threshold (14 V, 18 V and 22.75 V). Converter is disabled when the closure of the internal MOSFET-apple a1012 battery, m8244 battery, in order to prevent the leakage current in the LED and to conserve battery power. In shutdown mode, these components of power consumption less than 3μA.

In addition to the new TPS61060, TPS61061 and TPS61062 converters addition, TI also offers a variety of backgrounds to support the white LED lighting, high-performance power management and analog products. For example, TPS61042 inductive solution can support up to 8 serial white LED, and 8-pin QFN package.

TPS60230 can provide 5-channel, 125 mA charge pump solutions. For smart phones and digital camera flash LED power supply, TPS6102x Series 1.5A switch current DC / DC converters are the ideal.

Price and Availability

TPS61060, TPS61061 and TPS61062 is now available now available through TI and its authorized distributors quantities. Each device using an 8-pin QFN or 8-pin chip scale package. 1,000-piece quantities, TPS61060, TPS61061 and TPS61062 suggested retail price of 1.30 U.S. dollars, respectively, 1.40 U.S. dollars and 1.35 U.S. dollars.

Tube-type solid oxide fuel cell development has been a breakthrough

A few days ago, the Chinese Academy of Sciences the use of low-cost preparation of inorganic membrane technology successfully prepared tube solid oxide fuel cell, single-tube 1.0V battery open circuit potential in more than 800 ° C, 0.7V of output power dell battery under more than 25W. The tube-type cell research breakthrough for the development of solid oxide fuel cell distributed power plant and power station to provide a key focus on technology.

Solid oxide fuel cell using natural gas, city gas, liquefied petroleum gas, biomass gasification gas as fuel, the fuel chemical energy into electricity efficiently. As a result of solid oxide fuel cell with fuel-rich, clean and efficient, can be characterized by cogeneration can be widely used in large-scale power plants, distributed power plants, power plants, such as family, is considered to change the future power plant technology.

Solid oxide fuel cell membrane electrode configuration of the main plate and tube. Tube-type battery has good stability, ease of amplification module, suitable for the establishment of power stations, but the electrolyte membrane electrode electrochemical vapor deposition in general (EVD) technology to prepare, cost expensive. Therefore, the development of low-cost tube-type membrane electrode manufacturing technology, the development of solid oxide fuel cell power plant is crucial.

Direction in the Chinese Academy of Sciences and Ministry of Science and Technology project, supported by cast in solid oxide fuel cell membrane electrode forming the base, electrolyte and cathode coating film coating technologies, such as the preparation made significant progress, the success of the preparation  8mm × 500mm tube film electrode to solve the single-tube flow cell and sealed set of technical issues, the battery is good for repetition priming, high reliability. In the tube during the preparation of membrane electrode, the use of low-cost preparation of inorganic membrane technology, abandoning the high-cost vapor deposition  CVD and EVD technology, a significant reduction in the tube of Preparation of the cost of batteries for the future type of dell gk479 battery technology development industry and solid oxide fuel cell has laid a good practical use of the technology base.