LED driver controls dimming without PWM input
ROHM SEMICONDUCTOR Model BD8381EFV-M high-brightness LED driver IC for automotive forward illumination applications. The flexible, current-mode buck/boost controller provides stable operation over a wide input voltage (5-30V) and removes constraints on the number of LEDs in series connection. Integrated protection monitors voltage, current and temperature. LED open and short circuit detection is also provided. Device has an internal PWM controller so dimming functions can be implemented with a simple external CR circuit. This same circuit can be implemented to limit output current in case of LED overtemperature detection.