MENU

Constant-current LED drivers in low-profile DFN package for edge lighting

New Products |
By eeNews Europe


Like other members of the BCR4xxU series, the new devices can deliver an adjustable constant current between 10mA and 200mA (BCR420UFD) or 350mA (BCR421UFD) with ±10% tolerance, which in the case of the BCR421UFD can be controlled using a PWM signal of up to 25kHz and a duty cycle of 1% to provide LED dimming functionality. Both devices include a negative temperature coefficient, which lowers the LED driver current as the internal temperature rises, thereby protecting and extending the lifetime of the LEDs. In addition, the linear topology used is based on an NPN emitter-follower with emitter resistor, which means the devices exhibit virtually no EMI, making them fit for sensitive applications such as medical lighting. 
With a wide operating voltage range of between 1.4V and 40V and total power dissipation of up to 1.7W, the devices can be used to drive longer strings of LEDs while still providing sufficient protection from transients in a 24V system.

Diodes – www.diodes.com


Share:

Linked Articles
eeNews Europe
10s