Reduce the Cost and Complexity of Medium LCD LED Backlights with a Single Inductor LED Driver for 60 LEDs
by Daniel Chen, Linear Technology, Vendor website, Apr 01 2009
Focus:
Designs based on the LT3598 LED driver IC reduce the cost and complexity of LED backlights for medium-sized LCD displays. A boost converter that maintains a regulated LED current even when VIN is is greater than VOUT, the LT3598 drives as many as 6 strings of 10 LEDs at up to 30 mA per string, yet requires just a single driver IC, a single inductor, and some external passives. Design examples presented here include LED drivers for 60 LEDs driven at 20 mA, 20 LEDs driven at 90 mA, and 40 LEDs driven at 20 mA (with two channels disabled).
What you’ll learn:
- How to drive LED backlights in medium-sized LCD displays using a single driver IC and single inductor
Notes:
Linear Technology Design Note 462
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