NOT RECOMMENDED FOR NEW DESIGN CONTACT US AL3065A BOOST CONTROLLER WITH 4-CHANNEL HIGH PERCISION CURRENT SOURCE Description Pin Assignments The AL3065A is a high level integration boost controller with four (Top View) channels for WLED backlight applications. It operates over a wide input voltage ranging from 4.5V to 33V. The current of the four channels is simply programmed from 20mA to 400mA with an external resistor. The current match between any channels is 0.5% (typical). Its operating frequency can be adjusted from 0.1MHz to 1MHz. The AL3065A can be dimmed by one of the following modes: direct PWM dimming, PWM-to-analog dimming, or DC-to-analog dimming. Robust protection features include cycle-by-cycle current limit, soft- start, UVLO, programmable OVP, OTP, open/short LED protection, Schottky diode short and open protection, inductor short-circuit SO-16 protection, and V short protection. OUT The IC is available in SO-16 packages. Applications Features Input Voltage Range: 4.5V to 33V LCD Monitor Four High-Precision Current Sources LCD Display Module Current Matching 0.5% (Typical) LCD TV LED String Current up to 250mA per Channel, 400mA Pulse Current Low Ripple for Low BOM Cost 6KV HBM ESD Class 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 Built-in Below Comprehensive Protections Overcurrent Protection (OCP) Overvoltage Protection (OVP) Overtemperature Protection (OTP) Undervoltage Lock Out (UVLO) LED Open/Short Protection Schottky Diode/Inductor Short-Circuit Protection V Short/Schottky Diode Open Protection OUT Available in Pb-Free SO-16 Package 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) & 2015/863/EU (RoHS 3) compliant. 2. See AL3065A Typical Applications Circuit L 22H D V OUT V IN C OUT2 R C OV1 OUT1 C IN 1M OUT 22F 22F 10F CS VIN RCS R OV2 0.15 10k 51k EN ON OFF OVP RT R T CH1 COMP 120k RC 1k CH2 C C VCC CH3 0.22F C VCC CH4 2.2F ISET ADIM VCC / DC signal / NC R ISET 10k DIM GND PWM input 10k Pin Descriptions Pin Number Pin Name Function SO-16 1 CH4 LED Current Sink 4. If not usedsee1- to 3-Channel Recommended Connections. LED Current Set Pin. The corresponding maximum current of all four 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 resumes normal operation. 4 RT Frequency Control Pin. ON/OFF Control Pin. Forcing this pin voltage above 2.4V enables the IC while forcing below 0.5V shuts 5 EN down the 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 must be bypassed to GND with a ceramic capacitor. Supply Input Pin. A capacitor (typical 10F) must be connected between the VIN and GND to keep the 9 VIN DC input voltage constant. Analog Dimming Pin, which is 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 10 ADIM between this 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, which is used in conjunction with ADIM. Apply the PWM signal to this pin. Tie 12 DIM this pin to logic HIGH level, for analog dimming. 13 CH1 LED Current Sink 1. If not usedsee 1- to 3-Channel Recommended Connections. 14 CH2 LED Current Sink 2. If not usedsee 1- to 3-Channel Recommended Connections. 15 GND Ground. 16 CH3 LED Current Sink 3. If not usedsee 1- to 3-Channel Recommended Connections. 2 of 16 May 2021 AL3065A Diodes Incorporated www.diodes.com Document number: DS41124 Rev. 2 - 3 AL3065A