Performance White LED Driver

文件：3.52142 Mbytes 页数：13 Pages

Holtek

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High Current and Performance White LED Driver

文件：3.59481 Mbytes 页数：12 Pages

Holtek

合泰

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;

Holtek

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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

Holtek

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