Linear LED constant-current regulators need no external components

Diode Inc.'s BCR42xUW6 linear LED constant-current regulators are now stocked by Mouser. They integrate a transistor, diode and resistor to function as a constant-current regulator (CCR). The devices regulate with a preset 10mA nominal that can be adjusted with an external resistor up to 350mA. They are designed for driving LEDs in strings and will reduce current at increasing temperatures to self-protect. The BCR42xUW6 can be used in multiple applications where the maximum supply voltage to the device is <40V. For LED dimming, a low-side control can enable an (EN) pin which can be pulse-width modulated (PWM) up to 10kHz by a microcontroller. There is no need for additional external components and minimizes PCB area and component count with a fully-integrated SOT26, says the company. Applications include constant-current regulation (CCR) in systems such as automotive interior lighting, emergency lighting, signage, advertising, decorative and architectural lighting, retail lighting in fridges, freezers and vending machines.