The range of applications for LEDs has expanded from general lighting to automotive, industrial, and test equipment, as well as signage and safety equipment. As a result, the demand for advanced LED driver designs has grown significantly. The latest LED solutions require drivers that are compact, highly efficient, low-noise, and capable of delivering high dimming ratios along with advanced fault protection. The LT3922 is an ideal solution that meets all these requirements.
The LT3922 is a 36V synchronous LED driver featuring an integrated 2A switch, which can be configured as a boost, buck, or boost-buck topology. It is housed in a compact 4mm x 5mm QFN package and uses Analog Devices’ state-of-the-art switching technology. This ensures a small form factor while maintaining high efficiency and minimizing unwanted electromagnetic interference (EMI). The device’s synchronized switch edges are controlled, eliminating ringing and providing a balance between efficiency and noise reduction. These switches can operate at frequencies up to 2.5MHz, making the LT3922 a highly compact and efficient solution.
One of the key advantages of the LT3922 is its flexibility in topologies. It supports boost, buck, and boost-buck configurations, allowing designers to choose the most suitable topology based on their application needs. The high-side PWM and gate driver, along with internal features such as PWM dimming, SSFM (Spread Spectrum Frequency Modulation), low EMI, ISMON current monitoring, and output fault protection, are available across all topologies. This makes the LT3922 a versatile choice for a wide range of applications.
In boost mode, the LT3922 can supply up to 34V to an LED string, with some headroom below 40V to prevent open-circuit overshoot. At 2MHz, it delivers 330mA to a 34V LED string and supports external PWM dimming at 120Hz with a 2000:1 ratio or internal analog dimming with a 128:1 ratio. The device also offers robust fault protection, including LED open and short-circuit detection via the FAULT pin, and continuous current monitoring through the ISMON pin.
In buck mode, the LT3922 can handle input voltages up to 36V and drive LED strings with currents up to 1.5A. It achieves efficiencies of up to 94% at 12V VIN and maintains a 1000:1 PWM dimming ratio at 100Hz. The design allows for easy configuration of high-side current sensing and PWM dimming, making it suitable for applications requiring precise brightness control.
The boost-buck topology is ideal for applications where the input voltage may be higher or lower than the LED string voltage. It supports a wide input range and can drive LED strings from 3V to 16V using various battery inputs. This topology also features low ripple and high efficiency, with an efficiency of 85% at 12V VIN and 15V VLED.
In automotive applications, the LT3922 is well-suited for daytime running lights, signal indicators, taillights, and headlights. It operates within a 9V to 16V input range and can withstand 36V transients and cold starts as low as 3V. Its low EMI Silent Switcher architecture, combined with SSFM and controlled switching edges, ensures compliance with strict EMI standards like CISPR 25 Class 5. The device’s built-in fault protection reduces the need for additional components, simplifying the overall design.
For machine vision systems, the LT3922’s “keep switching†feature ensures consistent LED output even during long off-times. This is crucial for applications like pipeline inspection, where the timing between flashes can vary widely. The device digitally samples the converter state on the falling edge of the PWM signal and maintains the output voltage during the off period, ensuring stable performance regardless of the interval between flashes.
The LT3922 is a compact, high-performance LED driver that excels in both efficiency and noise reduction. With its flexible topology options, internal PWM dimming, and advanced fault protection, it is well-suited for demanding applications in automotive, industrial, and machine vision environments. Whether used in boost, buck, or boost-buck configurations, the LT3922 provides reliable and consistent performance, making it a powerful solution for modern LED lighting systems.
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PET self-closing braided sleeves are commonly used in industries such as automotive, electronics, and telecommunications to protect and manage cables in applications where flexibility, durability, and ease of installation are important.
The self-closing feature refers to the sleeve's ability to automatically close around the cables once they are inserted into the sleeve. This eliminates the need for additional fasteners or ties to secure the sleeve in place.
The braided construction provides excellent abrasion resistance and protection against external factors such as chemicals, UV rays, and heat. It also helps to organize and streamline cables, reducing clutter and tangling.
PET self-closing braided sleeves are commonly used in industries such as automotive, electronics, and telecommunications to protect and manage cables in applications where flexibility, durability, and ease of installation are important.
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