Huarun silicon New Voltage Mode Buck IC, for high power LED driver applications

Huarun powtech (Shanghai) Co. Ltd., before the introduction of fixed frequency voltage mode buck PT4105 integrated circuit for high power LED lighting drive applications, the input voltage is up to 18V, built-in power MOS, the maximum output current is up to 1A, can be in a wide input voltage range of single 1W (350mA current drive) or 3W (current 700mA) or LED, all kinds of high-power LED series / parallel combination.

PT4105 internal use of PWM control, the feedback voltage is only 200mV, has very high conversion efficiency, including undervoltage lockout, overheat protection, current limiting protection function, use convenient design, simple peripheral circuit, is an ideal choice for multi cell battery flashlight, automobile auxiliary lighting, home decoration lighting, miner's lamp and other applications. PT4105 uses SOIC8 package.

Drive scheme for single 1W PT4105 high power LED, working voltage range is 5 ~ 18V, when the input voltage is 5 ~ 12V, the conversion efficiency is more than 90%, when the input voltage is 12 ~ 18V, the conversion efficiency of more than 85%. Using PT4105 to achieve a single 3W high-power LED driver program, the effective operating voltage range of 6 ~ 18V, the conversion efficiency of more than 85%. PT4105 currently available samples and presentation boards available.