Diodes Semiconductor Electronic Components Datasheet

AL3065A Datasheet

BOOST CONTROLLER

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AL3065A

BOOST CONTROLLER WITH 4-CHANNEL HIGH PERCISION CURRENT SOURCE

Description

The AL3065A is a high level integration boost controller with four

channels for WLED backlight applications. It operates over a wide

input voltage ranging from 4.5V to 33V.

Pin Assignments

(Top View)

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

protection, and VOUT short protection.

SO-16

The IC is available in SO-16 packages.

Features

• Input Voltage Range: 4.5V to 33V

• Four High-Precision Current Sources

 Current Matching ±0.5% (Typical)

 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

 VOUT Short/Schottky Diode Open Protection

• Available in Pb-Free SO-16 Package

• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

• Halogen and Antimony Free. “Green” Device (Note 3)

Applications

• LCD Monitor

• LCD Display Module

• LCD TV

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 https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and

Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

AL3065A

Document number: DS41124 Rev. 1 - 2

1 of 16

www.diodes.com

August 2018

Diodes Semiconductor Electronic Components Datasheet

AL3065A Datasheet

BOOST CONTROLLER

No Preview Available !

Typical Applications Circuit

VIN

CIN

10µF

L 22µH

ON OFF

10kΩ

VIN

120kΩ

1kΩ

0.22µF

CVCC

2.2µF

COMP

VCC

VCC / DC signal / NC

PWM input

ADIM

DIM

10kΩ

OUT

RCS

0.15Ω

COUT1

22µF

ROV1 COUT2

1MΩ 22µF

VOUT

ROV2

51kΩ

OVP

CH1

CH2

CH3

CH4

ISET

GND

RISET

10kΩ

AL3065A

Pin Descriptions

Pin Number

SO-16

Pin Name

CH4

ISET

3 OVP

4 RT

5 EN

6 CS

7 OUT

8 VCC

9 VIN

10 ADIM

11 COMP

12 DIM

13 CH1

14 CH2

15 GND

16 CH3

Function

LED Current Sink 4. If not used—see1- to 3-Channel Recommended Connections.

LED Current Set Pin. The corresponding maximum current of all four strings is set through connecting a

resister from this pin to GND.

Overvoltage Protection Pin. When the OVP pin voltage exceeds 2.0V, the OVP is triggered, and the

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.

Frequency Control Pin.

ON/OFF Control Pin. Forcing this pin voltage above 2.4V enables the IC while forcing below 0.5V shuts

down the IC. When the IC is in shutdown mode, all functions are disabled to reduce the supply current

below 3µA.

Power Switch Current Sense Input.

Boost Converter Power Switch Gate Output. This pin outputs high voltage (5V) to drive the external N-

MOSFET.

5V Linear Regulator Output Pin. This pin must be bypassed to GND with a ceramic capacitor.

Supply Input Pin. A capacitor (typical 10µF) must be connected between the VIN and GND to keep the

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

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.

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

this pin to logic HIGH level, for analog dimming.

LED Current Sink 1. If not used—see 1- to 3-Channel Recommended Connections.

LED Current Sink 2. If not used—see 1- to 3-Channel Recommended Connections.

Ground.

LED Current Sink 3. If not used—see 1- to 3-Channel Recommended Connections.

AL3065A

Document number: DS41124 Rev. 1 - 2

2 of 16

www.diodes.com

August 2018

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AL3065A Datasheet

BOOST CONTROLLER

AL3065A Datasheet

BOOST CONTROLLER

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