60-V buck-boost LED driver offers 100 W

The LT3791 synchronous buck-boost dc/dc LED driver and voltage controller delivers 100-W power. It features 4.7 to 60V input voltage that suits automotive, industrial and architectural lighting. The output voltage can be set from 0 to 60 V, enabling it to drive a wide range of LEDs in a single string. An internal four-switch buck-boost controller operates from input voltages above, below or equal to the output voltage.

The buck-boost LED driver features three control loops to monitor input current, LED current and output voltage. The LT3791 uses four external switching MOSFETs and delivers from 5 to 100–W output power with efficiencies up to 98.5%. It provides current accuracy of ±6% and ±2% output voltage accuracy. It uses either analog or PWM dimming as required by the application. The switching frequency is programmable from 200 and 700 kHz or can be synchronized to an external clock. (From $4.75 ea/1,000 — available now.)

By Paul O’Shea

Linear Technology , Milpitas , CA
Sales Office 408-428-2050
www.linear.com