Technical Challenges Of LED Backlighting

Designers must strike a balance between system requirements, power sources, and circuit architecture to select an appropriate LED driver circuit architecture. Therefore, designers must weigh the available budget against the final product.

In addition, size and height create another technical limitation. Charge pumping and inductive DC/DC boost solutions with high switching frequencies allow the use of smaller external components. Especially for charge pump based LED driver circuits, parallel LED power supplies are used to reduce the size of external components because the charge pump and parallel LED power supplies only require extremely small external capacitors. Whether reducing the external component size of a charge pump or an inductive solution, the main consideration is the switching frequency of the LED driver circuit.