Driver ICs illuminate LEDs for small signage

Sunnyvale, Calif – The HV9921/22 family of three-pin constant-current ICs from Supertex is suited to driving low-current LED strings in signage and general lighting applications. These buck-controller chips can be powered from a 20- to 250-volt DC source derived from a universal mains source with front end rectifier. The HV9921 delivers 20 mA, and the HV9922 provides 50 mA.