Performance White LED Driver

文件：3.52142 Mbytes 頁(yè)數(shù)：13 Pages

HOLTEK

合泰

High Current and Performance White LED Driver

文件：3.59481 Mbytes 頁(yè)數(shù)：12 Pages

HOLTEK

合泰

High Current and Performance White LED Driver

HT7939A 是一款高效率升壓轉(zhuǎn)換器，可利用電流模式操作驅(qū)動(dòng)多個(gè)白光 LED。該芯片設(shè)計(jì)為由 5V 電源輸入驅(qū)動(dòng)多達(dá) 39 個(gè)白光 LED。白光 LED 電流可通過(guò)外部電流設(shè)置電阻來(lái)設(shè)置，反饋電壓低至 0.2V，以減少電阻功率損耗，從而提高效率。\n\n HT7939A 具有高達(dá) 200kHz 的調(diào)光頻率，在此調(diào)光頻率范圍內(nèi)具有出色的線性性能。該芯片具有過(guò)電壓保護(hù)功能，若 LED負(fù)載變?yōu)殚_(kāi)路，該功能可關(guān)閉轉(zhuǎn)換器以保護(hù)芯片不被損壞。該芯片還具有過(guò)電流保護(hù)，過(guò)溫保護(hù)和欠壓保護(hù)，防止輸出過(guò)載對(duì)設(shè)備造成損壞。\n\n ? 特性\n? 輸入電壓范圍：2.6V~5.5V\n? 高效率 – 高達(dá) 90%\n? 內(nèi)置 N 通道 MOSFET\n? 5V 的電壓輸入可驅(qū)動(dòng)多達(dá) 39 個(gè) WLED\n? 低待機(jī)電流：0.1μA ( 典型值 )\n? 內(nèi)置 OVP，OCP，OTP，UVLO 保護(hù)\n? EN 引腳調(diào)光頻率高達(dá) 200kHz\n? 1.2MHz 固定開(kāi)關(guān)頻率\n? 封裝類(lèi)型：6-pin SOT23;

Holtek

合泰

High Current and Performance White LED Driver

The HT7939A is a high efficiency boost converter for driving multiple White LEDs using current mode operation. The device is designed to drive up to 39 White LEDs from a 5V power supply. The White LED current is setup using an external current setting resistor, which has a low feedback voltage of 0. ?Input voltage range: 2.6V~5.5V\n ?High efficiency - up to 90%\n ?Integrated N-ch MOSFET\n ?Can drive up to 39 WLEDs from a 5V input\n ?Low standby current: 0.1uA (typ.)\n ?Built-in OVP, OCP, OTP, UVLO protection\n ?EN pin dimming frequency up to 200kHz\n ?1.2MHz fixed switching frequency\n ?SOT;

Holtek

合泰

LED驅(qū)動(dòng)

Holtek

合泰