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AL3066 Datasheet

FOUR-CHANNEL CURRENT SOURCE BOOST LED DRIVER

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Description
AL3066
FOUR-CHANNEL CURRENT SOURCE BOOST LED DRIVER
Pin Assignments
The AL3066 is a high efficiency 4-channel boost controller for WLED
backlight applications. It operates over a wide input voltage ranged
from 4.5V to 33V.
The current of the 4 channels is simply programmed from 20mA to
400mA with an external resistor. The current match between any
channel is ±1.5% (typical). Its operating frequency can be adjusted
from 0.1MHz to 1MHz.
The AL3066 can support two dimming modes: direct PWM dimming,
PWM 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.
CH4 1
ISET 2
OVP 3
RT 4
CS 5
OUT 6
VCC 7
HVCC 8
The IC is available in SO-16 package.
Features
Applications
SO-16
16 CH3
15 GND
14 CH2
13 CH1
12 DIM
11 COMP
10 DIM_ISET
9 VIN
Input Voltage Range: 4.5V to 33V
Drivers Up to 4 Strings in Parallel, 250mA Per String, 400mA
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, VOUT Short/Schottky Diode
Open Protection
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
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) compliant.
2. See http://www.diodes.com/quality/lead_free.html 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.
AL3066
Document number: DS39257 Rev. 2 - 2
1 of 14
www.diodes.com
February 2017
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AL3066 Datasheet

FOUR-CHANNEL CURRENT SOURCE BOOST LED DRIVER

No Preview Available !

Typical Applications Circuit
VIN
CIN
10F
L 22H
C HVCC
2. 2F
VIN
HVCC
RT
120k
RC
1k
RT
COMP
CC
0.22F
VCC
CVCC
2.2F
PWM input
EN
ON OFF
10k
DIM_ISET
DIM
PWM input
10k
D
OUT
CS
RCS
0.15
COUT1
22F
ROV 1
1 M
COUT2
22F
VOUT
ROV 2
51k
Adjustable
OVP
CH1
CH4
ISET
GND
RISET
10k
AL3066
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
Function
CH4
ISET
OVP
RT
CS
OUT
VCC
HVCC
VIN
DIM_ISET
COMP
DIM
CH1
CH2
GND
CH3
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
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 will resume normal operation.
Frequency control pin.
Power switch current sense input.
Boost converter power switch gate output. This pin outputs high voltage (10V) to drive the external N-
MOSFET.
5V linear regulator output pin. This pin should be bypassed to GND with a ceramic capacitor.
10V linear regulator output pin. This pin should be bypassed to GND with a ceramic capacitor.
Supply input pin. A capacitor (typical 10µF) should be connected between the VIN and GND to keep
the DC input voltage constant.
PWM to Analog dimming pin and Enable pin. Apply a PWM signal to this pin to adjust ISET pin
reference to regulate the output current.
Soft-start and control loop compensation.
PWM control dimming MOSFET pin. Apply a PWM signal to this pin to control LED dimming.
LED current sink 1. Leave the pin open directly if not used.
LED current sink 2. Leave the pin open directly if not used.
Ground
LED current sink 3. Leave the pin open directly if not used.
AL3066
Document number: DS39257 Rev. 2 - 2
2 of 14
www.diodes.com
February 2017
© Diodes Incorporated


Part Number AL3066
Description FOUR-CHANNEL CURRENT SOURCE BOOST LED DRIVER
Maker Diodes
Total Page 14 Pages
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