The first 2A flash LED driver chip

WLED Technology Co., Ltd. launched the product number AAT1282 for the industry's first 2A flash light emitting diode (LED) driver chip, which makes white light-emitting diodes (LEDs) can provide high brightness lighting. The new device will be 1 high frequency boost converter with constant input current limit, double output stabilizing channel and I2C control are integrated together to provide the required peak current with 1 super capacitor, provide high brightness flash with a resolution of up to 5M or more camera mobile phone, while protecting the battery. Several LED vendors have launched a similar product with a high standard of traditional xenon flash, which is currently the highest standard of high resolution digital cameras or smart phones. Analogictech product line director Phil Dewsbury said. "So far, because of the high battery current, forward voltage and peak current required to produce this brightness, the use of LED flash in portable applications has been limited. Through the AAT1282 output in 1 high capacity super capacitor storage boost converter, allow designers to use WLED provides high brightness lighting required high pixel camera flash and video applications, and to prevent battery leakage or damage. "AAT1282 in 2.7 to run the input range of 5.5V, designed for the application of LED photo flash products single lithium-ion battery powered and design. High efficiency, high current boost converter with two output current slots, can provide a stable current of 1A. The two LED current source can equal sharing of output current; the two LED current source is connected to the 1 single white light-emitting diodes, to provide 2A output current complete; can also be connected to its corresponding single diode current source driver provides two independent control of the output current of 1A. The boost converter has been designed specifically to charge a super capacitor, with a built-in fixed input current limiter to limit the battery current, while avoiding a large voltage drop caused by the phone restart. The current limit of AAT1282 is set to 800 mA, but other numerical can be obtained. This switching frequency boost converter operating up to 2 MHz, supported by 1 small selection H inductors and 2.2 F output capacitor selection, thus decreasing the end products of the plate size. "AAT1282 is a LED flash drive for super capacitor optimization, it makes equipment designers can through the use of super capacitor power will be promoted to a high resolution WLED flash unit, xenon flash unit to battery power supply far exceeds the standard and compete with light. The application of Engineering thin super capacitor pioneer CAP-XX vice president Pierre Mars said. "AAT1282 will drive all the required circuit are integrated together, such as the LED circuit and the control circuit, current super charging current of the moving control line, thus saving development time, area and unit cost. "The WLED driver uses an industry standard I2C serial digital input, which can be used to adjust the opening, closing, and setting up the image mode (flashlight) current for 16 LED. The flash / video mode current ratio, the output channel control, and the safety timer can be set by the I2C interface, and the maximum flash current and the video mode current can be set by 1 independent external resistors. The ratio between flash and video mode current is 7.3:1, and can be adjusted to a larger range of other values. The device can provide an independent flash enabled instruction to start the operation and control of flash, 1 default timer delay in user settings at the end of the suspension of flash activities, or as 1 security functions in the software error protection from excessive loss LED. AAT1282 also has 1 real load disconnect function, when the power off or off the load and power off. The function of the turn off current is maintained at 1 below A, eliminates the leakage current at. To protect the equipment in the case of a short circuit output, the new driver is also equipped with a built-in temperature management system, built-in circuit to prevent too large starting current at startup. AAT1282 rated operating temperature range is -40C to +85 C. The 3 x 3-mm 14-pin TDFN package, AAT1282 order quantity is 1000 for each unit price $1.75.

Source: electronic products in the world