Power Integrations has introduced a reference design for an 18W non-isolated A19 LED driver that is 88%-efficient.
The design is intended for a 100W incandescent bulb replacement and will support low-line(90 VAC to 135 VAC)operation.
"The lighting industry typically asks for 80%efficiency for drivers targeting 60W A19 bulb replacements.To achieve viable LED-based replacements for 75W and 100W bulbs,much higher efficiency is needed in order to reduce the heat dissipated by the driver,"said Andrew Smith,product marketing manager at Power Integrations.
"The 88%efficiency of DER-323 makes the thermal design of the bulb straightforward and inexpensive,"said Smith.
The circuit will fit on a single-sided board and 25 components.No potting is necessary and the transformer is replaced by a low-cost inductor.
Designated the DER-323,the reference design uses a buck-boost converter topology that fits inside the A19 bulb.
The design is EN61000-3-2(C)compliant and has a high power factor of over 0.98.
Based on a LNK460VG LinkSwitch-PL IC it combines both PFC and CC converter functions in a single-stage topology,no electrolytic bulk capacitor is required,resulting in a very long operational life.
