indie Semiconductor iND83211 LED Lighting Driver IC

The integrated step-down buck converter makes the iND83211 ideal for driving high-power LEDs. The device delivers the maximum constant current while maintaining low-power dissipation to minimize the LED’s junction temperature associated with decreased operating life and performance. A buck converter provides up to 750mA supporting high-current LEDs that require more than 200mA per RGB channel. The buck converter has a 5V nominal output that can be adjusted to 3.8V while keeping the current constant. In addition, any of the 24x channels can be connected in parallel to increase the current-sinking capabilities. The current for each channel can also be configured in the firmware to distribute the loads optimally.

To maintain stable color and intensity when there are temperature fluctuations, the indie Semiconductor iND83211 hardware includes a proprietary LED PN voltage detection circuit to measure the LED temperature accurately. Once the junction temperature is measured, a color correction factor is calculated (using the on-chip 32-bit Arm Cortex M0 processor) and applied to each channel RGB (using the 16-bit PWM and 100uA current stepping hardware). In addition, an integrated temperature sensor sets a specified limit to ensure the LEDs and supporting components do not exceed operational limits and risk overheating. Luminous flux for each color varies differently as LED junction temperature changes. iND83211 uses the LED voltage across each LED PN to determine the LED junction temperature.

Two LIN transceivers create a fixed connection using node configuration and identification service or auto addressing with slave node position detection. This interface sends or receives commands, diagnostic, and status information. With the embedded core, the iND83211 can adjust the color of the LEDs using only the received color coordinates, and all required configuration hardware parameters are calculated on the fly. The iND83211 efficiently and accurately drives LEDs at the maximum luminous output without exceeding safe operating conditions, requires minimal external components, and is housed in a compact 6mm x 6mm QFN package. The device’s hardware features and indie Semivonductor’s extensive software library make the iND83211 an excellent system solution for high-power LED applications.