PWM-Controlled Constant Current Driver 

for LED Displays

General Description

      The ST2226B is a LED driver incorporating shift registers, data latches, 16-channel constant current circuitry with current value set by an external resistor, 1024 gray level PWM (Pulse Width Modulation) functional unit and time division capability. Each channel can provide a maximum current of 60 mA. Time division operation allows driving up to 1 or 2 LEDs with a single output channel (mode-1 and mode-2 respectively).

Features

• Constant current outputs with current value settings by an external resistor

• Maximum output current: 60 mA

• Time division output allows the driving of 1 or 2 LEDs with a single output

• Maximum / minimum output voltage: 17V / 1.25V

• 10 bits luminance data with PWM current outputs 

• Serial shift-in architecture for luminance data in time division Mode 1 and Mode 2