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Linear LT3518 LED驱动器解决方案

文章出处:8gled.com作者:格烁光电发表时间:2018-07-24
成都代孕-宝贝频道4365【权威百分百】

Linear 公司的LT3518 LED是电流模式DC/DC转换器,内置了用来驱动LED的2.3A, 45V开关。LT3518具有3000:1真色彩PWM调光比,从250kHz 到 2.5MHz的可调工作频率,主要应用在显示器背景光,汽车电子,照明以及扫描仪。本文介绍LT3518的主要性能,方框图以及多种典型的应用电路图。

LT3518 - Full-Featured LED Driver with 2.3A Switch Current
The LT®3518 is a current mode DC/DC converter with an internal 2.3A, 45V switch specifically designed to drive LEDs. The LT3518 operates as a LED driver in boost, buck and buck-boost modes. It combines a traditional voltage loop and a unique current loop to operate as a constant-current source or constant-voltage source. Programmable switching frequency allows optimization of the external components for efficiency or component size. The switching frequency of the LT3518 can be synchronized to an external clock 太原代孕-【不成功退全款ron0】生育频道signal. The LED current is externally programmable with a 100mV sense resistor. The external PWM input provides 3000:1 LED dimming. The CTRL pin provides further 10:1 dimming ratio.

The LT3518 is available in the tiny footprint QFN UF16 (4mm ??4mm) package. The LT3518 provides a complete solution for both constant-voltage and constant-current applications.

主要特性:
■ 3000:1 True Color PWMTM Dimming Ratio
■ 2.3A, 45V Internal Switch
■ 100mV High Side Current Sense
■ Open LED Protection
■ Adjustable Frequency: 250kHz to 2.5MHz
■ Wide Input Voltage Range:
Operation from 3V to 30V
Transient Protection to 40V
■ Operates in Boost, Buck Mode and Buck-Boost Mode
■ Gate Driver for PMOS LED Disconnect*
■ Constant-Current and Constant-Voltage Regulation
■ CTRL Pin Provides 10:1 Analog Dimming
■ Low Shutdown Current: <1μA
■ Tiny (4mm ??4mm) 16-Pin QFN Package

应用:
■ Display Backlighting
■ Automotive and Avionic Lighting
■ Illumination
■ Scanners



图1。LT3518方框图



图2。典型应用



图3。降压模式1.5A LED驱动器电路



图4。500mA 5V-12V升压转换器



图5。降压/升压模式 LED驱动器电路




图6。带LED开路保护的降压模式1.0A LED驱动器电路




图7。带LED开路保护的升压模式300mA LED驱动器电路

来源:中电网


成都代孕-宝贝频道4365【权威百分百】 Linear LT3518 LED驱动器解决方案原创编辑请注明出来http://www.yzxinfa.com

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