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IS31BL3212-STLS2-TR Datasheet(PDF) 7 Page - Integrated Silicon Solution, Inc |
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IS31BL3212-STLS2-TR Datasheet(HTML) 7 Page - Integrated Silicon Solution, Inc |
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7 / 10 page  IS31BL3212 Integrated Silicon Solution, Inc. – www.issi.com 7 Rev. C, 06/24/2014 LED SELECTION The IS31BL3212 has low headroom voltage and it is designed to drive white-LEDs. The drive current will automatically scale down to reduce the LED current consumption. INPUT CAPACITOR SELECTION The IS31BL3212 is designed to run off of a fixed input voltage. Depending on the stability and condition of this voltage rail, it may be necessary to add a small input capacitor to help filter out any noise that may be present on the line. In the event that filtering is needed, ceramic composition capacitors are highly recom- mended over all other types of capacitors for use with the IS31BL3212. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low ESR, is lowest cost, has a smaller PCB footprint, and is non-polarized. Low ESR ceramic capacitors help to maximize charge pump transient response. Since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage. THERMAL PROTECTION The IS31BL3212 has a thermal protection circuit that will shut down the chip if the die temperature rises above the thermal limit. Although the IS31BL3212 is designed for driving white LEDs, the device also can be used to drive most types of LEDs with forward voltage specifications ranging from 2.0V to 4.7V. LED applications may include main and sub-LCD display backlighting, camera photo-flash applications, color (RGB) LEDs, infrared (IR) diodes for remotes, and other loads benefiting from a controlled output current generated from a varying input voltage. Since the D1 to D4 output current sources are matched with negligible voltage dependence, the LED brightness will be matched regardless of the specific LED forward voltage (VF) levels. In some instances (e.g., in high luminous output applications such as photo flash), it may be necessary to drive high-VF type LEDs. The low dropout current sources in the IS31BL3212 make it capable of driving LEDs with forward voltages as high as 4.7V at full current from an input supply of 2.7V to 5.0V. Outputs can be paralleled to drive high-current LEDs without complication |
Similar Part No. - IS31BL3212-STLS2-TR |
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Similar Description - IS31BL3212-STLS2-TR |
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