The Latest LED driving ICs and Modules

The solid-state lighting (SSL) surge has created a concomitant boom market for electronics to drive LEDs in various different applications, ranging from incandescent-replacement light bulbs to architectural lighting to streetlights and more. These new driver ICs and modules do more than simply provide power in the form needed by LEDs. Some devices can perform additional functions that engineers want in designing full-featured lighting system, such as dimming control and thermal regulation. In this article, we will examine some of the latest driver ICs and modules for LEDs, and the choices they offer the designer.
Dimming via PWM
Let’s look at some representative products offered today, and the options they give designers, beginning with module products from ROHM. One key advantage of ROHM’s modular technology is stable brightness. The forward current output that drives the LEDs is steady over a wide range of ambient temperatures — output current variation is only 1 percent from -20°C to 80°C — and across the entire recommended output voltage range (2.5 V to 12 V).
The Latest LED driving ICs and Modules
ROHM’s BP5843A driver module features high efficiency and precision, achieved using a current detector circuit that minimizes loss. The control circuitry, switching elements, transformers, and constant-current circuits required for switching are incorporated in a single module, making it possible to configure power supply circuits with just a few external components, thereby minimizing design efforts for maximum efficiency (Figure 1).
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