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Supertex HV9971高精度LED电流控制解决方案

文章出处:8gled.com作者:格烁光电发表时间:2018-07-23
苏州代孕-产子频道wQcz【宝宝在等你】Supertex公司的 HV9971是不连续导通模式(DCM)反激LED驱动器,可以工作满负荷100kHz开关频率,通用80-264VAC输入电压,±3% LED电流精度,自适应于外部元件误差和寄生参数,输出开路和短路保护,主要用在低功耗照明。本文介绍了HV9971主要特性,功能方框图和典型应用电路图。

The HV9971 is a primary-side control IC for driving a discontinuous conduction mode (DCM) flyback LED driver. The IC is optimized for operation at a constant full-load switching frequency of 100kHz and the universal input AC voltage range of 80-264VAC. It maintains 3% variation of the LED current setting, and features tight line and load regulation. The proprietary primary-side output current control employed in the HV9971 makes the output current setting insensitive to most component tolerances and parasitics without use of an opto-feedback.

The HV9971 LED driver is fully protected against output open and short circuit conditions and input under-voltage. It also offers a logic input for dimming the LED light output by means of pulse-width modulation of the output current.

The HV9971 is ideally suited for driving high-brightness LEDs in low-power lighting fixtures such as incandescent bulb retrofits.

HV9971主要特性:

Programmable true constant current operation

±3% LED current accuracy

Adaptive to external component tolerances and parasitics

Primary-side current sensing

Output open circuit protection

Output short circuit protection

Input under voltage lockout

PWM dimming / enable

Universal 80-264VAC operation

Fixed frequency operation

HV9971应用:

Low power lighting fixtures

图1。HV9971功能方框图

图2。HV997大连代孕-【献给母亲的爱9Zh2】月子频道1典型应用电路图

苏州代孕-产子频道wQcz【宝宝在等你】 Supertex HV9971高精度LED电流控制解决方案原创编辑请注明出来http://www.huatejx.com

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