AL3066 FOUR-CHANNEL CURRENT SOURCE BOOST LED DRIVER Description Pin Assignments The AL3066 is a high efficiency 4-channel boost controller for WLED SO-16 backlight applications. It operates over a wide input voltage ranged from 4.5V to 33V. CH4 16 1 CH3 The current of the 4 channels is simply programmed from 20mA to ISET 15 GND 2 400mA with an external resistor. The current match between any channel is 1.5% (typical). Its operating frequency can be adjusted OVP CH2 3 14 from 0.1MHz to 1MHz. RT 13 CH1 4 The AL3066 can support two dimming modes: direct PWM dimming, CS 12 5 DIM PWM to analog dimming. COMP OUT 6 11 Robust protection features include cycle by cycle current limit, soft- start, UVLO, programmable OVP, OTP, open/short LED protection, 10 7 VCC DIM ISET Schottky Diode Short and Open Protection, Inductor Short-Circuit Protection and V Short protection. OUT 9 HVCC 8 VIN The IC is available in SO-16 package. Applications Features LCD Monitor Input Voltage Range: 4.5V to 33V LCD Display Module Drivers Up to 4 Strings in Parallel, 250mA Per String, 400mA LCD TV Pulse Current 3% Current Precision Low Ripple for Low BOM Cost 4kV HBM ESD Class High Voltage Pins CS and OVP for Safety Test Support Direct PWM Dimming, PWM to Analog Dimming 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 --- AL3066 Typical Applications Circuit L 22H D V OUT V IN C ROV1 C OUT1 OUT2 C IN 10F 1M 22F 22F OUT CS VIN R CS ROV2 HVCC 0.15 C Adjustable HVCC 51k 2.2F OVP RT R T COMP CH1 120k RC 1k CC VCC CH4 0.22F C VCC 2.2 F PWM input ISET DIM ISET 10k R ISET EN 10k DIM GND ON OFF 10k PWM input 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 3 OVP power 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. 5 CS Power switch current sense input. Boost converter power switch gate output. This pin outputs high voltage (10V) to drive the external N- 6 OUT MOSFET. 7 VCC 5V linear regulator output pin. This pin should be bypassed to GND with a ceramic capacitor. 8 HVCC 10V 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 9 VIN the DC input voltage constant. PWM to Analog dimming pin and Enable pin. Apply a PWM signal to this pin to adjust ISET pin 10 DIM ISET reference to regulate the output current. 11 COMP Soft-start and control loop compensation. 12 DIM PWM control dimming MOSFET pin. Apply a PWM signal to this pin to control LED 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 February 2017 AL3066 Diodes Incorporated www.diodes.com Document number: DS39257 Rev. 2 - 2 AL3066