LT3519IMS-1#TRPBF

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PMIC - LED drivers have a vast application field ranging from consumer, industrial, commercial and medical. This article will address the specific application, characteristics and working of the LT3519IMS-1#TRPBF IC LED driver.

The LT3519IMS-1#TRPBF IC LED drivers, from Texas Instruments, are current mode step-down LED drivers which have been specifically designed to support very low-profile 3W LED applications. They have integrated inductors, internal high-efficiency switches and low-side Schottky diodes. As compared to traditional single-inductor buck solutions, power dissipation is significantly reduced. Thanks to its tiny form factor, it can be integrated into designs with a very limited PCB space.

This LED driver integrates a highly efficient PWM dimming algorithm which can support a minimum LED current of 0.25mA and a maximum LED current of 3.2A. It also has a minimum analog dimming range of 1:1000 with a maximum analog dimming range of 1:256. The LT3519IMS-1#TRPBF IC LED driver can be configured to operate from an input voltage range of 6V to 48V and can be used to drive multiple LED strings. It further enables stable LED brightness control from wide input voltage variations and supports over-voltage protection.

This IC LED driver also provides high immunity from EMI noise, eliminating the need for external filtering components. The wide modulation frequencies and low power consumption further provide for stable flicker-free lighting. It has a wide ambient temperature range of -40°C to +125°C and comes in a green Thin QFN (Quad Flat No-Lead) 4 millimeters package.

The LT3519IMS-1#TRPBF IC LED driver\'s working is based on pulse-width modulation where the LED current remains constant with changes in the output voltage. The LED current regulation occurs through switching the LED current on and off at a constant frequency and varying the level of duty cycle of the current. The input voltage is regulated through the use of a main switching stage and a secondary feedback stage. The main switching stage is configured as an adjustable peak current-mode buck converter and the secondary feedback stage is configured as a regulated peak current-mode buck converter.

The LT3519IMS-1#TRPBF IC LED driver controllers incorporate a wide range of features including PWM dimming, integrated soft-start, and a programmable frequency. All these features help to create efficient and stable high-power LED applications. To sum up, the LT3519IMS-1#TRPBF IC LED driver has one of the narrowest solution footprints, a wide input voltage range and impressive start-up times - making it ideal for 3W LED applications.

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