AL8843QTypical Applications Circuit VIN: 4.5V to 40V RSET VIN SET C1 CTRL D1 AL8843Q GND SW L1 Pin DescriptionsPin NumberPin NameFunction 1, 2 GND Ground of IC 3 SET Set Nominal Output Current Pin. Connect resistor RSET from this pin to VIN pin to define nominal average output current.
4 NC No Connection Multi-Function On/Off and brightness control pin: Leave floating for normal operation. Drive to voltage below 0.3V to turn off output current. Drive with DC voltage (0.4V < VCTRL < 2.5V) to adjust output current from 10% to 100% of 5 CTRL IOUT_NOM. Drive with an analog voltage > 2.6V output current wil be 100% of IOUT_NOM. A PWM signal (Low level voltage < 0.3V, High level voltage > 2.6V, transition time less than 1µs) allows the output current to be adjusted over a wide range up to 100%. Connect a capacitor from this pin to ground to increase soft-start time.
(Default soft-start time = 0.1ms. Additional soft-start time is approximate 1.5ms/1nF).