Performance White LED Driver

文件：3.52142 Mbytes 页数：13 Pages

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High Current and Performance White LED Driver

文件：3.59481 Mbytes 页数：12 Pages

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High Current and Performance White LED Driver

HT7939A 是一款高效率升压转换器，可利用电流模式操作驱动多个白光 LED。该芯片设计为由 5V 电源输入驱动多达 39 个白光 LED。白光 LED 电流可通过外部电流设置电阻来设置，反馈电压低至 0.2V，以减少电阻功率损耗，从而提高效率。\n\n HT7939A 具有高达 200kHz 的调光频率，在此调光频率范围内具有出色的线性性能。该芯片具有过电压保护功能，若 LED负载变为开路，该功能可关闭转换器以保护芯片不被损坏。该芯片还具有过电流保护，过温保护和欠压保护，防止输出过载对设备造成损坏。\n\n   特性\n• 输入电压范围：2.6V~5.5V\n• 高效率 – 高达 90%\n• 内置 N 通道 MOSFET\n• 5V 的电压输入可驱动多达 39 个 WLED\n• 低待机电流：0.1μA ( 典型值 )\n• 内置 OVP，OCP，OTP，UVLO 保护\n• EN 引脚调光频率高达 200kHz\n• 1.2MHz 固定开关频率\n• 封装类型：6-pin SOT23;

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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;

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LED驱动

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