--- NOT RECOMMENDED FOR NEW DESIGN CONTACT US AL3065 FOUR-CHANNEL CURRENT SOURCE BOOST LED DRIVER Description Pin Assignments The AL3065 is a high efficiency 4-channel boost controller for WLED (Top View) backlight applications. It operates over a wide input voltage ranged from 4.5V to 33V. CH4 16 CH3 1 The current of the 4 channels is simply programmed from 20mA to ISET 2 15 GND 400mA with an external resistor. The current match between any channel is 1.5% (typical). Its operating frequency can be adjusted OVP 3 14 CH2 from 0.1MHz to 1MHz. 13 RT 4 CH1 The AL3065 can support three dimming modes: direct PWM dimming, PWM to analog dimming and DC to analog dimming. 12 EN 5 DIM Robust protection features include cycle by cycle current limit, soft- CS 6 11 COMP start, UVLO, programmable OVP, OTP, open/short LED protection, Schottky Diode Short and Open Protection, Inductor Short-Circuit OUT 10 ADIM 7 Protection and V Short protection. OUT VCC 9 VIN 8 The IC is available in SO-16 package. SO-16 Features Input Voltage Range: 4.5V to 33V Applications Drivers up to 4 Strings in Parallel, 250mA per String, 400mA Pulse Current 3% Current Precision LCD Monitor Low Ripple for Low BOM Cost LCD Display Module 4KV HBM ESD Class LCD TV High Voltage Pins CS and OVP for Safety Test Supports Direct PWM Dimming, PWM to Analog Dimming and DC to Analog Dimming Control Minimum PWM Dimming Duty Cycle can be 1/10,000 at 100Hz Dimming Frequency LED Open/Short Protection Schottky Diode/Inductor Short-Circuit Protection Built-in OCP, OVP, OTP, UVLO, V Short/Schottky Diode OUT Open Protection 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 AL3065 Pin Descriptions Pin Number Pin Name Function 1 CH4 LED current sink 4. Leave the pin open directly if not used. LED current set pin. The corresponding maximum current of all 4 strings is set through connecting a 2 ISET resister from this pin to GND. Overvoltage protection pin. When the OVP pin voltage exceeds 2.0V, the OVP is triggered and the power 3 OVP switch is turned off. When the OVP pin voltage drops below Hysteresis voltage, the OVP is released and the power switch will resume normal operation. 4 RT Frequency control pin. ON/OFF control pin. Forcing this pin voltage above 2.4V enables the IC while below 0.5V shuts down the 5 EN IC. When the IC is in shutdown mode, all functions are disabled to reduce the supply current below 3A. 6 CS Power switch current sense input. Boost converter power switch gate output. This pin outputs high voltage (5V) to drive the external N- 7 OUT MOSFET. 8 VCC 5V linear regulator output pin. This pin should be bypassed to GND with a ceramic capacitor. Supply input pin. A capacitor (typical 10F) should be connected between the VIN and GND to keep the 9 VIN DC input voltage constant. Analog dimming pin, used in conjunction with DIM. When a DC voltage between 0V and 1.5V is applied to this pin analog dimming is achieved if DIM is tied HIGH. When a capacitor is connected between this 10 ADIM pin and GND, the PWM signal applied to the DIM pin is filtered and modulates the output current. When this pin is connected to a HIGH level, direct PWM dimming is achieved. 11 COMP Soft-start and control loop compensation. PWM dimming control pin, used in conjunction with ADIM. Apply the PWM signal to this pin. Tie this pin 12 DIM to logic HIGH level, for analog dimming. 13 CH1 LED current sink 1. Leave the pin open directly if not used. 14 CH2 LED current sink 2. Leave the pin open directly if not used. 15 GND Ground 16 CH3 LED current sink 3. Leave the pin open directly if not used. 2 of 14 June 2021 AL3065 Diodes Incorporated www.diodes.com Document number: DS37677 Rev. 4 - 3