Automatic phase shifting white LED driver focuses on LCD backlighting applications
The AnalogicTech AAT1451 LED driver offers many innovative features that enable manufacturers to offer products with comprehensive feature sets that address consumer demands. For example, the AAT1451:
- Drives up to four light emitting diode (LED) strings at up to 93 percent efficiency, and extends this efficiency to low LED brightness levels by automatic phase shifting, which further increases battery life.
- Uses a 32 kHz pulse width modulation (PWM) operating frequency to ensure silent operation.
- Has a high switching frequency (600 kHz – 1 MHz) to allow original equipment manufacturers (OEMs) to select small passive components resulting in lighter and smaller end products.
- Offers a wide selection of DC input voltages so that devices can be powered from sources including cigarette lighter adapters and multi-cell Li-Ion batteries.
- Incorporates comprehensive safety features to alert system controller and take corrective action by disabling shorted and open LED strings to prevent thermal fault conditions.
The AAT1451’s proprietary PWM dimming reduces peak currents by as much as 75 percent and the 256 LED brightness levels support the Android operating system platform and Content Adaptive Brightness Control (CABC) to further increase battery life.
To ensure accurate backlight color temperature and uniform brightness across the entire display, the AAT1451 has four precision current sinks that are programmable up to 30 mA per string at +/- 2 percent accuracy with +/- 1.5 percent matching between strings to drive up to 48 white LEDs at 120 mA total output current.
The AAT1451 is priced at US$0.82 for 10K units. The AAT1451 is currently shipping.
Visit Advanced Analogic Technologies at www.analogictech.com.
If you enjoyed this article, you will like the following ones: don't miss them by subscribing to :
