Off-line LED driver ICs for bulbs, tubes and ballasts to 22 W

June 10, 2016 // By Graham Prophet
Power Integrations’ LYTSwitch-1 single-stage, non-isolated, buck topology LED driver IC family is enables design of LED bulbs and tubes with high constant-current accuracy while using a minimum number of components. Its driver algorithm ensures high power factor (PF) and low total harmonic distortion (THD) while maintaining very high efficiency.

Housed in an SO-8 package, the ICs are greater than 93% efficient with a PF of over 0.9 and THD as low as 15%. Devices can be used in a low-side buck topology for reduced EMI or in a high-side buck topology which simplifies design. Delivering up to 22 W without a heatsink, the universal input (100 - 308 VAC) ICs incorporate a 725V MOSFET for high reliability. Designers can make use of small, off-the-shelf inductors due to the IC’s peak current control algorithm. The new devices meet all applicable international standards including: DOE 6 (external power supply), CEC Title 20 and 24, ENERGY STAR SSL, EN61000-3-2 (C) plus China and India standards. PI adds tht they can be used in space-challenged applications such as tube end caps, small form factor candles and GU10 bulbs, as well as low cost A19 and decorative-filament lamps.”


The ICs have protection features including thermal foldback with end-stop shutdown, short circuit protection, input and output OVP, overcurrent and SOA protection. Pricing is $0.26 (10,000). Reference design DER-548 is available for download now from the Power Integrations website at


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