AL3022MTR-G1 Diodes Incorporated

A Product Line of Diodes Incorporated AL3022 3043 PWM BOOST CONTROLLER Description Pin Assignments The AL3022 is a constant 140KHz, voltage mode, external compensation boost controller. The AL3022 has low feedback voltage (Top View) and makes it ideal for low cost LED backlight supplies. The AL3022 can support external PWM dimming and analog dimming. VIN 1 8 EN The AL3022 offers complete system protection with integrated Under Voltage Lockout, Over Voltage Protection, Over Current Protection, 2 7 OVP OUT Output Voltage (V ) Short to GND Protection and Over OUT Temperature Protection circuitry. GND 3 6 COMP To satisfy the limited PCB mounting space requirements, this IC is 5 FB CS 4 available in SO-8 package to save space. Features SO-8 Voltage Mode PWM Controller Low 0.2V Reference Voltage Fixed 140KHz Frequency Applications External PWM Dimming and Analog Dimming Low Shutdown Current (0.1A) LED TV External Compensation LED Monitor Built-in UVLO Function LED Display Module Built-in OVP Built-in OTP Built-in OCP Built-in V Short to GND Protection OUT Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See A Product Line of Diodes Incorporated AL3022 3043 Pin Descriptions Pin Number Pin Name Function Supply input pin. A capacitor should be connected between the VIN pin and GND pin to keep the DC 1 VIN input voltage constant. 2 OUT Gate driver pin. This pin is connected to external MOSFET gate to turn it on/off. 3 GND Ground pin 4 CS Over current protection pin 5 FB Feedback pin. This pin is connected to an external resistor divider to program the system output voltage. Compensation pin. This pin is the output of the internal error amplifier. COMP is forced to low when 6 COMP V <3.6V. IN 7 OVP Overvoltage detection pin Enable and dimming pin. When EN input voltage is lower than 0.3V, disable the IC. When EN input voltage is higher than 2.6V, enable the IC. PWM dimming can be provided by an external control signal 8 EN greater than 100Hz, duty cycle from 1% to 90%. In addition, analog dimming can be provided by a DC signal ranged from 0.8 V to 2.4V. Functional Block Diagram FB COMP 5 6 7 OVP OVP & UVP EA 2 Control COMP OUT Driver Logic 4 OCP CS 3 GND Over 8 1.25V VCC VCC EN Bandgap Temperature Regulator Protection Oscillator PULSE 1 VIN 2 of 12 AL3022 September 2014 Diodes Incorporated www.diodes.com Document number: DS36514 Rev. 3 - 2 NEW PRODUCT 0 to 200mV REF SAW