This document introduces a method to reduce the cost and complexity of medium LCD LED backlights by using a single inductor LED driver. The driver can drive 60 LEDs simultaneously and has a built-in power switch to save space and design time.
This document describes a design solution using the LT3598 to reduce cost and complexity in medium-sized LCD displays by driving six strings of ten LEDs with a single inductor. The IC features built-in power switching, adaptive feedback loops for efficiency, and thermal derating capabilities.
The application note details typical configurations, including driving 60 LEDs at 20mA per string or combining channels to drive higher currents up to 90mA per string. It also covers channel disable functionality and PWM dimming performance.
The device drives six strings of ten LEDs at up to 30mA per string.
Multiple channels can be combined to drive two strings at up to 90mA per string.
The LED current will linearly decrease if the junction temperature keeps increasing.