Consistent LED driver for automotive standards

Rohm has introduced an automotivegrade LED driver for mid-sized LCD-backlighting applications, providing accurately-matched currents up to 150mA for repeatable and reliable driving of four LED chains.

The BD8118FM features a 4-channel constantcurrent driver with integrated power transistors, which support PWM or analogue voltage control of LED luminance. The on-chip boost converter is regulated to minimise the voltage drop across the current sources to maintain consistent brightness at minimum power dissipation. Added features include an external Enable pin and a soft-start function to eliminate overshoot. The switching frequency can be adjusted easily with external resistors and capacitors.

Comprehensive built-in protection features include Under-Voltage Lockout (UVLO), overvoltage protection, overcurrent protection and thermal shutdown.

 

FEATURES LED-open detection Failure indication Qualified to AEC-Q100

APPLICATIONS GPS equipment Rear-view camera displays In-car entertainment General-purpose displays for rugged applications

 

 

 

• Vishay ambient-light sensors, page 080308

 

Rohm/LED Drivers