高亮LED驱动电路（HV9910）

发布时间：2009-12-25 12:40 发布者：我爱电路图

关键词： LED , 电路 , 高亮 , 驱动

英文版

General Description

The HV9910 is a PWM high-effi ciency LED driver control IC.
It allows effi cient operation of High Brightness (HB) LEDs
from voltage sources ranging from 8VDC up to 450VDC.
The HV9910 controls an external MOSFET at fi xed switching
frequency up to 300kHz. The frequency can be programmed
using a single resistor. The LED string is driven at constant
current rather than constant voltage, thus providing constant
light output and enhanced reliability. The output current can
be programmed between a few milliamps and up to more than
1.0A.

The HV9910 uses a rugged high voltage junction isolated
process that can withstand an input voltage surge of up to
450V. Output current to an LED string can be programmed to
any value between zero and its maximum value by applying
an external control voltage at the linear dimming control input
of the HV9910. The HV9910 provides a low-frequency PWM
dimming input that can accept an external control signal with a
duty ratio of 0-100% and a frequency of up to a few kilohertz.