TITPS92551450mA23W恒流微模块LED驱动解决方案

LED驱动微型模块,最大驱动电流450mA,功率23W,能驱动多达16个LED/串.器件集成了包括电源指示器的所有功率元件,电源效率高达95%,输入电压4.5V-60V,LED电流从300mA到450mA可调整,开关频率800kHz,主要用在通用照明如台灯,装饰灯,街灯,建筑照明如水下照明,壁龛照明和聚光灯等.本文介绍了TPS92551主要特性和封装亮点,方框图,典型应用电路和相应的材料清单,评估板PCB布局图.

TPS92551封装亮点:

■ 7 lead easy-to-use package (Similar to TO-263)

■ Single exposed die attach pad for enhanced thermal performance 10.2 x 13.8 x 4.6 mm package

TPS92551主要特性:

■ Integrated all power components including the power inductor

■ Wide input voltage range : 4.5V - 60V

■ Constant switching frequency at 800kHz

■ High contrast ratio (Minimum dimming current pulse width 16μs)

■ Drives up to 16 LEDs in series at 60V input

■ ÷3.5% typical LED current accuracy

■ LED current adjustable from 300mA to 450mA

■ Up to 95% efficiency

■ Input Under-Voltage Lock-Out (UVLO)

■ Compatible with ceramic and low ESR capacitors

■ Low Electro Magnetic Interference (EMI) complies with EN55015 standard

■ LED open and short circuit protections

■ Thermal shutdown and RoHS compliant

■ -40C to +125C junction temperature range

TPS92551应用:

■ General Lighting

Desk Lamps

Cabinet Lamps

Decorative Lamps

Street Lamps

■ Architecture Lighting

Recess Lights

Spot Lights

Underwater Lights

图1.TPS92551方框图

图2.TPS92551典型应用电路图: VIN = 48V, ILED = 350mA, LED数量 = 5 –13