Infineon BCR112: A Comprehensive Technical Overview
The Infineon BCR112 represents a pinnacle of integration and performance in the realm of linear constant current regulators (CCRs) designed for driving LEDs. As a two-terminal device, it simplifies circuit design by eliminating the need for additional external components, providing a stable and reliable current source. This makes it an ideal solution for a wide array of lighting applications, from automotive interior lighting and signage to consumer electronics and general indicator lights.
At its core, the BCR112 is a self-biased transistor that maintains a constant current over a wide range of input voltages and temperatures. Its key electrical parameter, the output current, is preset to a nominal value of 20 mA, which is a standard for many modern LEDs. The device can handle input voltages (V_{RWM}) up to 40 V, offering sufficient headroom for various automotive and industrial supply rails. A critical advantage is its exceptionally low dropout voltage, ensuring high efficiency even when the input voltage is only marginally higher than the forward voltage of the LED string.
One of the most significant features of the BCR112 is its robustness and built-in protection. It incorporates reverse polarity protection, safeguarding the device and the LED from damage if the supply connections are accidentally reversed—a common occurrence during installation or maintenance. Furthermore, its high ESD robustness, certified to withstand up to 8 kV (Human Body Model), ensures reliability in harsh electrical environments, making it exceptionally suitable for automotive applications that must meet stringent quality standards.
From a design-in perspective, the BCR112 dramatically reduces both component count and board space. Designers can replace a traditional resistor, which leads to current variations with changing supply voltage, with this single, stable component. This not only improves performance but also enhances long-term reliability and reduces overall system cost. Its operation is straightforward: it is simply placed in series with the LED load, and it automatically regulates the current.
The device is offered in the ultra-small SOT-23-3 surface-mount (SMD) package, which is ideal for space-constrained modern electronic designs. Its excellent thermal characteristics ensure stable operation across an industrial temperature range from -40 °C to 150 °C.
ICGOODFIND: The Infineon BCR112 is a highly integrated, robust, and efficient constant current regulator that simplifies LED driving circuitry. Its combination of built-in protection, wide operating range, and minimal footprint makes it an outstanding choice for designers seeking reliability and performance in automotive, industrial, and consumer applications.
Keywords: Constant Current Regulator, LED Driver, Reverse Polarity Protection, ESD Robustness, SOT-23-3 Package.
