Datasheet AL8862Q (Diodes) - 2

AL8862Q Typical Applications Circuit
V R IN: 5 to 55V SET VIN SET CTRL C1 AL8862Q D1 FAULT GND SW L1
Pin Descriptions Pin Number Pin Name Function
Set Nominal Output Current Pin. Connect resistor R 1 SET SET from this pin to VIN to define nominal average output current. 2,7 GND Ground of IC 3 FAULT FAULT Indication. Asserted Low to report faulty conditions. Needs an external pull-up resistor. Input voltage (5V to 55V). Decouple to ground with 10μF or higher X7R ceramic capacitor close to 4 VIN device. 5,6 SW Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI. 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 < VSET < 2.5V) to adjust output current from 10% to 100% of IOUT_NOM 8 CTRL Drive with an analog voltage >2.6V output current will be 100% of IOUT_NOM A PWM signal (Low level <0.3V, High level >2.6V, transition times less than 1s) 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 approximately 1.5ms/1nF) EP EP Exposed pad/TAB connects to GND and thermal mass for enhanced thermal impedance.
Functional Block Diagram
SET FAULT SW 1 3 4 OTP 5, 6 VIN SW Open Fault VDD Generator Current I Monitor LIMITER Logic OCP Comp BG & Ref Hysteresis PWM Logic Driver Reference Control 8 PWM/DC CTRL OTP Dimming OTP PWM 2 7 GND GND AL8862Q 2 of 16 December 2019 Document number: DS42199 Rev. 3 - 2
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