Single-Stage vs. Two-Stage Drivers

The key circuit elements in an LED lamp are the LEDs, the optics, the casing (including heat-sinking) and the driver. The driver now represents anywhere from 10% to 40% of total bulb cost, so selecting the right topology is crucial to delivering the most cost-optimized design. In order to achieve a long operating life, designers must carefully consider the types of components used, their circuit location and the temperature/power dissipated. Size limits are also a challenge for small bulbs.