AL3022

A Product Line of
Diodes Incorporated
AL3022
3043
PWM BOOST CONTROLLER
Description
Pin Assignments
(Top View)
VIN
1
8
EN
The AL3022 offers complete system protection with integrated Under
Voltage Lockout, Over Voltage Protection, Over Current Protection,
Output Voltage (VOUT) Short to GND Protection and Over
OUT
2
7
OVP
Temperature Protection circuitry.
GND
3
6
COMP
CS
4
5
FB
To satisfy the limited PCB mounting space requirements, this IC is
available in SO-8 package to save space.
Features











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
SO-8
Voltage Mode PWM Controller
Low 0.2V Reference Voltage
Fixed 140KHz Frequency
External PWM Dimming and Analog Dimming
Low Shutdown Current (0.1µA)
External Compensation
Built-in UVLO Function
Built-in OVP
Built-in OTP
Built-in OCP
Built-in VOUT Short to GND Protection
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
Applications



LED TV
LED Monitor
LED Display Module
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.
Typical Applications Circuit
D1
L1
VIN
C2
C1
22µH/2A
22µF/25V
C3
VOUT
10µF/
50V
3
10µF/
50V
EN
U1
1
R1
8
10KΩ
6
R2
20KΩ
5
C5
VIN
EN
COMP
FB
OUT
GND
CS
R4
2 10KΩ
Q1
R3 1
2.2Ω
2
C4
1µF
AL3022
NEW PRODUCT
The AL3022 is a constant 140KHz, voltage mode, external
compensation boost controller. The AL3022 has low feedback voltage
and makes it ideal for low cost LED backlight supplies. The AL3022
can support external PWM dimming and analog dimming.
R5
150kΩ
3
4
OVP 7
R7
1.1Ω
R8
1.2Ω
R6
5.1KΩ
100pF
C6
220nF
AL3022
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A Product Line of
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AL3022
3043
Pin Number
Pin Name
Function
1
VIN
Supply input pin. A capacitor should be connected between the VIN pin and GND pin to keep the DC
input voltage constant.
2
OUT
Gate driver pin. This pin is connected to external MOSFET gate to turn it on/off.
3
GND
Ground pin
4
CS
Over current protection pin
5
FB
Feedback pin. This pin is connected to an external resistor divider to program the system output voltage.
6
COMP
Compensation pin. This pin is the output of the internal error amplifier. COMP is forced to low when
VIN<3.6V.
7
OVP
8
Overvoltage detection pin
Enable and dimming pin. When EN input voltage is lower than 0.3V, disable the IC. When EN input
voltage is higher than 2.6V, enable the IC. PWM dimming can be provided by an external control signal
greater than 100Hz, duty cycle from 1% to 90%. In addition, analog dimming can be provided by a DC
signal ranged from 0.8 V to 2.4V.
EN
Functional Block Diagram
FB
COMP
5
6
7
OVP & UVP
EA
COMP
0 to 200mV REF
EN
8
Bandgap
Control
Logic
Driver
OCP
1.25V
VCC
VCC
Regulator
SAW
NEW PRODUCT
Pin Descriptions
Oscillator
Over
Temperature
Protection
2
4
3
OVP
OUT
CS
GND
PULSE
1
VIN
AL3022
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AL3022
3043
Absolute Maximum Ratings (Note 4)
NEW PRODUCT
Symbol
Parameter
VIN
Input Voltage
VEN
EN Pin Voltage
Rating
Unit
-0.3 to 20
V
-0.3 to VIN +0.3
V
VGATE
OUT Pin Voltage
20
V
VOVP
OVP Pin Voltage
7
V
-0.3 to +5.5
V
+150
°C
-65 to +150
°C
VFB
TJ
FB Pin Voltage
Operating Junction Temperature
TSTG
Storage Temperature Range
TLEAD
Lead Temperature (Soldering, 10sec)
+260
°C
Thermal Resistance (Junction to Ambient)
105
°C/W
–
ESD (Machine Model)
600
V
–
ESD (Human Body Model)
4000
V
θJA
Note 4. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Symbol
Parameter
VIN
Input Voltage
TA
Operating Ambient Temperature
AL3022
Document number: DS36514 Rev. 3 - 2
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Min
Max
Unit
4
18
V
-40
+85
°C
September 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
Electrical Characteristics
Symbol
AL3022
3043
(@VIN = 5V, TA = +25°C, unless otherwise specified.)
Parameter
Conditions
Min
Typ
Max
Unit
4.0
–
18
V
SUPPLY VOLTAGE (VIN PIN)
VIN
Input Voltage
–
IQ
Quiescent Current
Test at VFB = 0.3V
–
5
–
mA
Shutdown Supply Current
VEN = 0V
–
0.1
–
µA
NEW PRODUCT
ISHDN
UNDER VOLTAGE LOCKOUT
VUVLO
Input UVLO Threshold
VIN Rising
3.6
3.8
4.0
V
VHYS
Input UVLO Hysteresis
–
100
200
300
mV
OVER VOLTAGE PROTECTION
–
Over Voltage Threshold
–
1.45
1.55
1.65
V
–
Under Voltage Threshold
–
–
0.1
–
V
Duty = 90%
–
0.33
–
V
Thermal Shutdown Temperature
–
–
+160
–
°C
Thermal Shutdown Hysteresis
–
–
+20
–
°C
–
–
400
–
µA/V
–
–
–
0.3
V
–
2.6
–
–
V
–
–
0.8
–
V
–
–
2.4
–
V
OVER CURRENT PROTECTION
VCS
Over Current Threshold
OVER TEMPERATURE PROTECTION
TOTSD
–
ERROR AMPLIFIER
Gm
Error Amplifier Transconductance
ENABLE (EN PIN)
VEN-OFF
EN Pin Threshold
VEN-ON
VEN-DIM
EN Pin Dimming Threshold
VOLTAGE REFERENCE (FB PIN)
VFB
Feedback Voltage
–
0.194
0.2
0.206
V
IFB
Feedback Bias Current
–
–
35
100
nA
Line Regulation
VIN = 4.5V to 18V
–
2
20
mV
∆VFB
GATE DRIVER (OUT PIN)
fOSC
Oscillator Frequency
–
110
140
170
KHz
DMAX
Max. Duty Cycle
–
90
95
99
%
VGATE
OUT Pin Voltage (Note 5)
IOUT = 10mA
–
VIN-1
–
V
–
65.5
–
ns
–
88.5
–
ns
tRISE
Rising Time
tFALL
Falling Time
VIN = 5V,
OUT Pin Load = 1nF
Note 5: Guaranteed by design.
AL3022
Document number: DS36514 Rev. 3 - 2
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AL3022
3043
Performance Characteristic (@TA = +25°C, VDD = 5V, unless otherwise specified)
Quiescent Current vs. Input Voltage
Shutdown Supply Current vs. Input Voltage
Shutdown Supply Current (A)
Quiescent Current (mA)
5.8
5.6
5.4
5.2
2
4
6
8
10
12
14
16
18
20
22
0.4
0.2
0.0
24
4
6
8
10
Input Voltage (V)
12
14
16
18
20
22
24
Input Voltage (V)
Feedback Voltage vs. Input Voltage
Oscillator Frequency vs. Input Voltage
150
0.30
Oscillator Frequency (KHz)
Feedback Voltage (V)
0.25
0.20
0.15
0.10
0.05
0.00
2
4
6
8
10
12
14
16
18
20
22
145
140
135
130
4
24
6
8
10
12
14
16
18
20
22
24
Input Voltage (V)
Input Voltage (V)
Over Voltage Protection Voltage vs. Input Voltage
Over Current Protection Voltage vs. Input Voltage
1.60
0.340
1.55
0.335
Over Current Protection Voltage (V)
Over Voltge Protection Voltage (V)
NEW PRODUCT
6.0
1.50
1.45
1.40
1.35
1.30
1.25
1.20
0.330
0.325
0.320
0.315
0.310
0.305
0.300
2
4
6
8
10
12
14
16
18
20
22
24
Input Voltage (V)
AL3022
Document number: DS36514 Rev. 3 - 2
2
4
6
8
10
12
14
16
18
20
22
24
Input Voltage (V)
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3043
Performance Characteristic (Cont. @TA = +25°C, VDD = 5V, unless otherwise specified)
FB Voltage vs. EN Voltage
Quiescent Current vs. Temperature
6.0
220
200
180
5.5
Quiescent Current (mA)
FB Voltage (mV)
140
120
100
80
60
5.0
4.5
40
20
0
0.5
1.0
1.5
2.0
2.5
3.0
4.0
-50
3.5
0
25
50
75
100
125
O
Temperature ( C)
Shutdown Supply Current vs. Temperature
Feedback Voltage vs. Temperature
0.22
0.21
Feedback Voltage (V)
Shutdown Supply Current (A)
-25
EN Voltage (V)
2
1
0
0.20
0.19
0.18
0.17
-1
-50
-25
0
25
50
75
100
0.16
-50
125
-25
0
25
50
75
100
125
O
O
Temperature ( C)
Temperature ( C)
Oscillator Frequency vs. Temperature
150
Oscillator Frequency (KHz)
NEW PRODUCT
160
145
140
135
130
-50
-25
0
25
50
75
100
125
O
Temperature ( C)
AL3022
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A Product Line of
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AL3022
3043
Application Information
General Operation
The AL3022 uses a constant frequency, voltage mode control scheme to provide excellent line and load regulation. To drive LED load, the AL3022
can be connected as shown in the Typical Applications Circuit on page 1. The maximum duty cycle of the PWM controller is limited to 90%. PWM
dimming input can be provided by an external control signal greater than 100Hz, duty ratio of 1% to 90%. In addition, analog dimming can be
provided by a DC signal ranged from 0.8V to 2.4V.
NEW PRODUCT
The AL3022 offers comprehensive protection features such as UVLO, OCP, OVP, OTP, LED open and VOUT Short to GND.
Enable/Dimming Control
The AL3022 uses EN pin to turn on and off the controller and also perform Digital (PWM) Dimming.
When EN input voltage is lower than 0.3V, the controller turns off and the shutdown current can be limited below 0.1µA. When EN input voltage is
higher than 2.6V, the controller turns on and the reference voltage is set to 0.2V.
The AL3022 has an internal 80±15%kΩ pull low resistor on the EN pin, thus the device is normally in the off state or shutdown mode operation.
When a PWM signal was presented into the EN pin of the AL3022 shown in Figure 1 below.
1). When the EN pin is higher than 2.6V, the device will turn on and the output current is at the programmed maximum level.
2). When the EN pin is lower than 0.3V, the device will turn off and the output current goes to 0mA.
If the frequency of the PWM signal is greater than 100Hz, the human eye cannot detect the on and off state of the LEDs. The human eye can only
see a dimmed diode rather than a pulsed brightness. This dimming method provides a controlled inrush current at turn-on. The PWM duty cycle
from 0% to 100% controls the output current from 0mA to the maximum programmed level.
PWM
EN
AL3022
FB
R
Figure 1. Digital Dimming Control Using a PWM Signal in EN Pin
Analog Dimming Control
The Analog Dimming is to inject a constant DC voltage to EN pin shown in Figure 2 below. The feedback voltage is indirectly adjusted when the
EN pin voltage is from 0.8V to 2.4V, which can be used as dimming control. The output LED current can be adjusted from minimum to maximum
level by applying the DC voltage level from 0.8V to 2.4V.
Comparing with all kinds of dimming control, this method features a best output voltage and LEDs current.
AL3022
Document number: DS36514 Rev. 3 - 2
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A Product Line of
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AL3022
3043
Application Information (cont.)
DC Voltage
0.8V to 2.4V
EN
AL3022
NEW PRODUCT
FB
R
Figure 2. Analog Dimming Control Using a DC Voltage Signal in EN Pin
Soft Start Control
The AL3022 external compensation circuit can clamp the output waveform to soft start smoothly.
Operation Protection
1. Under Voltage Lockout
The AL3022 provides an under voltage lockout circuit to prevent it from undefined status when startup. The Under Voltage Lockout circuit turns the
driver off when supplying voltage drops below 3.6V. The UVLO circuit has 200mV hysteresis, which means the device starts up again when VIN
rises to 3.8V.
2. Over Voltage Protection / LED Open Protection
The controller has an internal OVP circuit. The controller output voltage will boost too high when LEDs are disconnected from the circuit or fail to
open. The AL3022 will latch off the output if the OVP pin senses a voltage that is larger than 1.55V, and the power switching will be turned off. The
latched off status can be reset by reducing the supply voltage to lower than 3.6V or EN lower than 0.3V.
3. Under Voltage Protection / VOUT Short to GND Protection
The AL3022 monitors the OVP pin, if the OVP pin voltage is less than 0.1V, MOSFET drive output will turn off. When OVP is higher than 0.1V,
system can auto recover. This protects the converter if V OUT is shorted to ground.
4. Over Current Protection
The AL3022 integrates an OCP circuit. The CS pin is connected to the voltage-sensor (RCS) that placed between the Drain of MOS and GND. If
the voltage on CS pin exceeds 0.33V, it is turned off immediately and will not turn on until the next cycle begins.
5. Over Temperature Protection
The AL3022 monitors the temperature of itself. The AL3022 shuts itself off if the temperature exceeds the threshold value (typically +160oC). This is
a no-latched protection. The device recovers once the temperature has decreased approximately +20oC.
AL3022
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3043
Ordering Information
AL3022 X XX – XX
NEW PRODUCT
Product Name
RoHS/Green
Package
Packing
M : SO-8
TR : Tape & Reel
G1 : Green
Package
Temperature
Range
Part Number
Marking ID
Packing
SO-8
-40°C to +85°C
AL3022MTR-G1
L3022M-G1
3000/13’’Tape & Reel
Marking Information
(Top View)
L3022
M-G1
YWWAXX
-
AL3022
Document number: DS36514 Rev. 3 - 2
First and Second Lines: Logo and Marking ID
Third Line: Date Code
Y: Year
WW: Work Week of Molding
A: Assembly House Code
th
th
XX: 7 and 8 Digits of Batch No.
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3043
Package Outline Dimensions (All dimensions in mm(inch).)
(1)
Package Type: SO-8
4.700(0.185)
5.100(0. 201)
7°
~ 9°
0.320(0. 013)
TYP
1.350(0. 053)
1.750(0. 069)
NEW PRODUCT
8°
8°
~ 9°
7°
0.600(0. 024)
0.725(0. 029)
D
5.800(0. 228)
6.200(0. 244)
1.270(0. 050)
TYP
D
20:1
0.300(0. 012)
R0.150(0.006)
0.100(0. 004)
1.000(0. 039)
TYP
3.800(0. 150)
Option 1
4.000(0. 157)
0.300(0. 012)
0.150(0. 006)
0.250(0. 010)
Option 1
0°
8°
1°
7°
0.510(0. 020)
R0.150(0.006)
0.450(0. 017)
0.820(0. 032)
Option 2
0.350(0. 014)
TYP
Note: Eject hole , oriented hole and mold mark is optional .
AL3022
Document number: DS36514 Rev. 3 - 2
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AL3022
3043
Suggested Pad Layout
(1)
Package Type: SO-8
NEW PRODUCT
Grid
placement
courtyard
G
Z
Y
E
X
Dimensions
Z
(mm)/(inch)
G
(mm)/(inch)
X
(mm)/(inch)
Y
(mm)/(inch)
E
(mm)/(inch)
Value
6.900/0.272
3.900/0.154
0.650/0.026
1.500/0.059
1.270/0.050
AL3022
Document number: DS36514 Rev. 3 - 2
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AL3022
3043
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
NEW PRODUCT
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2014, Diodes Incorporated
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AL3022
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