Datasheet AL8843Q (Diodes) - 2

AL8843Q Typical Applications Circuit
VIN: 4.5V to 40V RSET VIN SET C1 CTRL D1 AL8843Q GND SW L1
Pin Descriptions Pin Number Pin Name Function
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). 6 VIN Input Voltage (4.5V to 40V). Decouple to ground with 10μF or higher X7R ceramic capacitor close to device. 7, 8 SW Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI. EP EP Exposed pad/TAB. Connect to GND and thermal mass for enhanced thermal impedance. AL8843Q 2 of 18 October 2019 Document number: DS41943 Rev. 2 - 2
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