What this 16-channel linear LED driver actually does
The Texas Instruments TLC5921DAPR is a linear LED driver IC that integrates 16 constant-current sink outputs, each rated for 80 mA, with a shift-register interface clocked at 20 MHz. It accepts a supply voltage between 4.5 V and 5.5 V and drives outputs up to 17 V. The shift-register topology means you load grayscale or on/off data serially, then latch it to all outputs simultaneously — useful for LED panels, signage, or indicator arrays where you need independent control per channel without a separate PWM controller per LED.