LT3517IFE#PBF

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The LT3517IFE#PBF is a high-efficiency, 6-channel LED driver with integrated feedback and dimming functions that targets power-on-demand, application-specific LED systems. It is ideal for portable and general lighting applications, such as low-power, high-dynamic illumination for automotive, industrial, medical and gaming markets. Applications using LT3517IFE#PBF include LED bulbs, streetlights, vehicle headlamps and spotlights, task light and residential fixtures, signage and displays, medical instruments, and mobile phone and tablet displays. The product also fits into a system with design flexibility by allowing up to 240 mA of total charge current.

The LT3517IFE#PBF is an integrated 6-channel LED driver with a master current limit function, integrated feedback and dimming control, and 6 independent channels. It is designed to drive up to 240 mA total charge current, or up to 120 mA on each individual channel. This makes it suitable for a wide range of application-specific lighting solutions such as automotive headlamps, signage, displays, and task lights.

The LT3517IFE#PBF utilizes a monolithic current-controlled switchmode power management technology called synchronous rectification, which maximizes energy efficiency while minimizing component count, space and cost. The core of the power management system in the LT3517IFE#PBF is a rectangularized high-side switch (RHS) that connects the system load to the power supply. The primary purpose of the RHS is to minimize charge ripple and minimize loop inductance of the component, which reduces the switching losses, thus improving the overall efficiency. The LT3517IFE#PBF also has a dual-channel, slow start-up and shutdown feature, which reduces the power demand on startup and prevents LED overshoots.

The LT3517IFE#PBF also offers some system level benefits like integrated feedback and dimming control, which allows scalability from 0~99% brightness, as well as short-circuit protection and thermal shutdown. It also features current limitation, which helps protect the LED and optimize performance. The LT3517IFE#PBF integrates fault protection, which is triggered by over-temperature and short-circuit fault. Lastly, the LT3517IFE#PBF can be integrated into multiple systems, allowing for flexibility, including analog dimming and pulse width modulation (PWM) dimming.

The LT3517IFE#PBF is manufactured using TSMC 40nm logic process technology, and has a detailed power architecture containing four functional blocks. These functional blocks are the synchronous rectification switch, the master current limit, the dimming control logic, and the feedback and dimming blocks. While the synchronous rectification switch is the main power stage of the LT3517IFE#PBF, the master current limit provides the means to regulate the maximum charge current, while the dimming control logic provides the means to regulate the LED brightness or LED dimming. All these functional blocks are administered by the feedback and dimming block, which is responsible for providing feedback, dimming and fault control.

In conclusion, the LT3517IFE#PBF is an integrated, 6-channel LED driver with integrated feedback and dimming control, making it ideal for all types of application-specific LED solutions. It has a robust power architecture, with current-limited switch, dimming control logic, and master current limit. It is also highly reliable, with safety features such as overheating protection and short-circuit protection.

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