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This LED load board is designed for use with all NXP® LED driver demo boards that support up to 16 channels. The board contains 256 LEDs arranged in 16 channels of 16 LEDs each. The board is connected to the driver PCB with a cable that connects only the number of channels supported by the driver demo board. For each channel, jumpers enable the number of LEDs per channel to also be configured. These jumpers also enable fault detection performance to be evaluated. Push pin connectors enable the board to be connected to any driver system.
The 34844 is a high efficiency, LED driver for use in backlighting LCD displays from 10" to 20"+. Operating from supplies of 7 V to 28 V, the 34844 is capable of driving up to 160 LEDs in 10 parallel strings. Current in the 10 strings is matched to within 2%, and can be programmed via the I2C/SM-Bus interface.