San Jose, Calif., U.S.: Power Integrations (PI) is claiming an industry first with its LED-driver design for replacing 100-W A19 incandescent bulbs (see the figure). With LED efficacies continuing to improve, the company says, an A19 sized replacement for the 100-W incandescent bulb will soon be within reach. PI’s LinkSwitch-PL family already enables cost-effective 60- and 75-W bulb replacements.
The DER-322 design, which uses the PI’s LinkSwitch LNK460VG, is a non-isolated high-power-factor LED driver with an efficiency of 93%. It will drive a nominal LED string voltage of 78 V at 230 mA from an input voltage range of 195 V ac to 265 V ac (47 to 63 Hz).
Fitting neatly inside the A19 form factor, the DER-322 complies with EN61000-3-2 C (D) and passes total harmonic distortion (THD) limits. With a PF above 0.95, it suits commercial as well as consumer applications.
With power factor correction (PFC) and constant current (CC) conversion combined into a single switching stage, the design has a very low component count, which enables miniaturisation, lowers cost, and increases reliability. It also eliminates short-lived electrolytic input bulk capacitors.
Suitable for an A19 incandescent bulb replacement-driver but also reconfigurable as a T8 tube replacement driver, the reference design may be easily modified to support TRIAC dimming.