company blog about ADI LT3755EMSE-2 LED Controllers For Driving High-Current Lighting

ADI LT3755EMSE-2 LED Controllers For Driving High-Current Lighting

Shenzhen Mingjiada Electronics Co., Ltd., as a professional component supplier, offers the ADI LT3755EMSE-2 LED controller. This chip, specifically designed to drive high-current LEDs, provides a reliable solution for high-power LED applications.

The LT3755EMSE-2 controller supports multiple topologies, including boost, buck, buck-boost, flyback, and SEPIC configurations, meeting the demands of diverse complex applications. Its wide input voltage range of 4.5V to 40V and output voltage capability up to 75V make it particularly suitable for automotive electronics, industrial lighting, and high-power LED driver applications.

【LT3755EMSE-2 Product Features and Advantages】

The LT3755EMSE-2 is a high-performance DC/DC controller designed primarily as a constant current source for driving high-current LEDs. Its fixed-frequency, current-mode architecture ensures stable operation across a broad range of supply and output voltages.

The LT3755EMSE-2 offers multiple dimming capabilities, achieving an LED dimming ratio of up to 3000:1 via the PWM input, while the CTRL input provides additional analogue dimming functionality. This flexibility enables lighting system designers to precisely control LED brightness to meet the demands of diverse application scenarios.

The LT3755EMSE-2's high-side current sensing solution offers the most flexible approach to driving LEDs, permitting boost, buck, or buck-boost mode configurations. This feature significantly enhances design flexibility, enabling engineers to optimise solutions for specific applications.

The LT3755EMSE-2 also incorporates comprehensive protection features, including programmable under-voltage lockout, open-circuit LED protection, and soft-start functionality. These characteristics substantially enhance system reliability and longevity while reducing design risks.

【Key Specifications of LT3755EMSE-2】

Wide input voltage range: 4.5V to 40V, capable of withstanding 40V load dump transients common in automotive environments.

High output capability: Delivers output voltages up to 75V with configurable output currents of 1A or higher (depending on external component selection), capable of driving up to 14 series-connected 1A LEDs.

Adjustable high-frequency operation: Switching frequency programmable between 100kHz and 1MHz, facilitating optimisation between efficiency, performance, and external component size.

Multiple dimming modes: Supports true colour PWM dimming (up to 3000:1 dimming ratio) and analogue dimming via the CTRL pin.

Comprehensive protection features: Includes LED open-circuit protection, programmable under-voltage lockout (with hysteresis), and programmable soft-start.

Low standby power consumption: Shutdown current below 1μA.

Operating temperature range: -40°C to +125°C, suitable for harsh environments such as automotive applications.

Package: 16-pin MSOP-EP (exposed pad) facilitates thermal management.

【LT3755EMSE-2 Technical Specifications Detailed】

The LT3755EMSE-2 utilises a 16-pin MSOP-EP package, suitable for surface mount technology (SMT), facilitating integration into various space-constrained applications. Its operating temperature range spans -40°C to 125°C, ensuring stable operation even in harsh environments.

The LT3755EMSE-2's switch frequency is adjustable from 100kHz to 1MHz, allowing engineers to optimise performance based on efficiency, functionality, or external component size requirements. The high-side current sense voltage is a mere 100mV, contributing to reduced power consumption and enhanced efficiency.

The LT3755EMSE-2's low standby power consumption is another key feature, with shutdown current below 1μA, making it highly suitable for battery-powered devices and energy-efficient applications.

【LT3755EMSE-2 Application Scenarios】

The LT3755EMSE-2's broad application scope makes it an ideal choice for lighting designs across multiple sectors.

In automotive lighting, the LT3755EMSE-2 can drive high-power LED headlights, daytime running lights, and fog lamps. Its wide input voltage range (6V to 36V) is particularly suited to the demanding requirements of automotive power systems, withstanding extreme conditions such as load dump and cold-crank operation.

For industrial lighting, the LT3755EMSE-2 delivers constant current to high-brightness LEDs, making it suitable for factory lighting, outdoor floodlights, and architectural landscape illumination. Its output voltage capability up to 75V permits driving multiple LEDs in series.

Furthermore, the LT3755EMSE-2 demonstrates its versatility in applications such as precise current-limited voltage regulators and battery chargers.