The new LED driver AAT1239-1 can drive 10 series WLED

WLED Technology Co., Ltd. (AnalogicTech) launched a high frequency, high efficiency, constant current boost converter AAT1239-1, which can drive up to 10 series of white light-emitting diodes (LEDs). The new driver chip for personal navigation devices (PND), backlight applications electronic dictionary, electronic photo frame and cellular mobile phone designed by simplified serial control S2C 1-wire interface research Nobel proprietary, effectively reduce the commonly used low frequency pulse width modulation (PWM) control design produced in the flash screen.

"Because of the continuous expansion of portable systems designers in their products, they need to use increasingly sophisticated lighting features to support those new features," said Phil, director of research product line manager Dewsbury. "By driving up to 10 WLED in series, the AAT1239-1 simplifies the use of larger LCD panels in a wide range of battery powered portable devices. "

The AAT1239-1 operates from an input voltage range of 2.7V to 5.5V, and the 30mA can provide a maximum continuous output voltage of 40V, providing a constant LED current for up to 10 series of WLED. The built-in soft start function can avoid the output voltage beyond all input voltage range.

Single wire S2C interface controlled WLED can cover 26 independent current levels without the need for additional lines. The AAT1239-1 also features a true load disconnect function that can disconnect the load from the power supply when it is turned off or disabled. The function of the 1 A to ensure that the shutdown current, to eliminate the limited power supply in the portable application of leakage current, thereby extending battery life.

This new WLED driver chip provides efficiencies of up to 82%. A switching frequency of up to 2 MHz can provide very fast response, allowing the use of very small external inductors and capacitors, and thus help to reduce the size of the terminal product. AAT1239-1 also provides short circuit, over voltage and over temperature protection.

Price and supply

AAT1239-1 rated operating temperature range is -40 to +85 DEG C, using lead-free, 12 pin TSOPJW package, is now available, the order quantity is $1.08 per piece price of $1000 per piece.

Source: International Electronic Business