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ADI Launches Step-Down DC/DC Converter for Precise LED Current Control

Google 우선 소스Published2017.07.12 10:45
Wide voltage range allows for use in automotive, industrial, and architectural lighting.

Analog Devices announced the release of the new LT3932 monolithic synchronous step-down DC/DC converter, which features a 36V, 2A power switch and a PWM generator.

The new product operates in fixed-frequency peak current mode control and accurately controls LED current within ±1.5% for LED strings up to 2A. The built-in PWM generator provides a dimming ratio of up to 128:1. For applications requiring a dimming ratio of 5,000:1, the LT3932 can be used in conjunction with an external PWM generator. The LT3932 has a very wide input voltage range of 3.6V to 36V, making it suitable for a wide range of applications, including automotive, industrial, and architectural lighting.

The combination of the proprietary Silent Switcher® topology and spread-spectrum frequency modulation technology minimizes EMI issues. The LT3932 can supply over 50W of power by driving up to 8 white LEDs at 2A each at a nominal input voltage of 32V.

The LT3932 provides 93% efficiency even at a switching frequency of 2 MHz and offers a very small and compact solution footprint as it does not require an external heatsink. It further enhances reliability by incorporating protection against open circuits or short circuits in the LED. The switching frequency of the LT3932 can be adjusted between 200 kHz and 2 MHz or synchronized with an external clock signal.

Available in a thermally enhanced 4mm x 5mm QFN package, the LT3932 is a very compact high-output LED driver solution. In addition, it offers various features including accurate LED current sensing, monitor output, 99.9% duty cycle operation, and programmable UVLO (under voltage lock-out).
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