Diodes unveils high performance ac/dc led driver

Utilising pulse frequency modulation technology and operating in boundary conduction mode, the AP1684 provides tight current regulation to an accuracy of ±2%, while achieving a power factor of .97 and THD of less than 20%. According to Diodes, the primary side driver removes the need for optocoupler, secondary side control and loop compensation circuitry. Driving an external bipolar junction transistor, the AP1684 requires only a small external component count and coupled with its SO8 packaging, enables lamp designers to reduce pcb footprint, increase power density and boost overall product reliability. The driver keeps start up and operating currents low and uses dynamic base driver control and valley mode switching to minimise transition loss and achieve high efficiency, typically 93%.