The reference design – DER-322 – describes a non-isolated, 93% efficient, high-power-factor (PF) LED driver designed to drive a nominal LED string voltage of 78 V at 230 mA from an input voltage range of 195 VAC to 265 VAC (47 Hz – 63 Hz). The LED driver utilises the very low-profile LNK460VG from the LinkSwitch(tm)-PL family of ICs from Power Integrations.
DER-322 fits inside the A19 form factor, is EN61000-3-2 C (D) compliant and passes THD limits. With a PF above 0.95, it is suitable for commercial as well as consumer applications. With PFC and CC conversion combined into a single switching stage, the design has a very low component count, which enables miniaturization, lowers cost and increases reliability. It also eliminates short-lived electrolytic input bulk capacitors.
Commenting Andrew Smith, product marketing manager at Power Integrations said, “With an 8-10% efficiency advantage over older solutions, DER-322 provides a compelling option for lighting engineers working toward the landmark achievement of a commercially viable A19-sized replacement for the 100 W incandescent bulb. With LED efficacies continuing to improve, this important milestone will soon be within reach. In the meantime, the LinkSwitch-PL family of ICs easily enables production of cost-effective replacements for 60 W and 75 W bulbs.”
Suitable for an A19 incandescent bulb replacement-driver but also reconfigurable as a T8 tube replacement driver, DER-322 is of interest to designers of both high-end LED lighting and those working on cost optimisation of bulbs for retail sale. The reference design may be easily modified to support TRIAC dimming.