LED驅動微型模塊,最大驅動電流450mA,功率23W,能驅動多達16個LED/串.器件集成了包括電源指示器的所有功率元件,電源效率高達95%,輸入電壓4.5V-60V,LED電流從300mA到450mA可調整,開關頻率800kHz,主要用在通用照明如臺燈,裝飾燈,街燈,建筑照明如水下照明,壁龕照明和聚光燈等.本文介紹了TPS92551主要特性和封裝亮點,方框圖,典型應用電路和相應的材料清單,評估板PCB布局圖.

TPS92551封裝亮點:

■ 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應用:

■ General Lighting

Desk Lamps

Cabinet Lamps

Decorative Lamps

Street Lamps

■ Architecture Lighting

Recess Lights

Spot Lights

Underwater Lights

圖1.TPS92551方框圖

圖2.TPS92551典型應用電路圖: VIN = 48V, ILED = 350mA, LED數量 = 5 –13