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AL1663/AL1663R
UNIVERSAL FLYBACK AND BUCK-BOOST
SINGLE STAGE DIMMABLE LED CONTROLLER
Description
The AL1663/AL1663R is a high performance single stage Flyback
and Buck-boost controller, targeting dimmable LED lighting
application. It is a primary side regulation (PSR) controller which can
provide accurate constant current (CC) regulation without opto-
coupler and secondary control circuitry. It is operating at BCM mode
and switching at the valley which results in good EMI and efficiency.
With working in constant on time, the system achieves high PF and
low total harmonic distortion (THD) under universal input voltage.
Pin Assignments
APWM 1
PWMD 2
COMP 3
CS 4
(Top View)
8 FB
7 VCC
6 OUT
5 GND
NC 1
FB 2
CS 3
GND 4
8 APWM
7 COMP
6 VCC
5 OUT
The AL1663/AL1663R can support multiple dimming modes. When a
0.3V to 2.4V DC signal is applied on APWM pin, the device will
operate in analog dimming mode. When a digital signal is applied on
APWM pin, the device works at PWM dimming mode. And for AL1663
When a digital signal is applied on PWMD pin and the APWM pin is
connected with a hundreds of nF capacitor, the device will work in
PWM-to-DC dimming mode.
The AL1663/AL1663R features low start-up current and low operation
current. It integrates multiple protections including over voltage, short
circuit, over current and over temperature protection.
AL1663
SO-8
AL1663R
SO-8
Applications
General LED Lighting Driver with Dimming Function
General Purpose Constant Current Source
LED Backlighting Driver
Smart LED Lighting
The AL1663/AL1663R is available in SO-8 package.
Features
Primary Side Regulation without Opto-coupler
Valley Switching for Low Switching Loss
Low Start-up Current
High PF and Low THD
High Efficiency
Tight LED Current Variation Range
Tight Output Open Voltage Variation Range
Support both PWM Dimming and Analog Dimming
Internal Protections
Under Voltage Lock Out (UVLO)
Output Over Voltage Protection (OVP)
Output Short Protection (OSP)
Over Current Protection (OCP)
Thermal Fold-back Protection (TFP)
Over Temperature Protection (OTP)
Low System Cost
Package: SO-8
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 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.
AL1663/AL1663R
Document number: DS38466 Rev. 2 - 2
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March 2017
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AL1663/AL1663R
Typical Applications Circuit
AC
Input
F1
VR1
DB1
L1
C1 C2
RTH
T1
C5
R10
D2
Aux R4 D1
Cvcc
R5 D4
VCC PWMD APWM
FB OUT
AL1663
R9
R6 COMP
Rcomp
GND
CS
U1
Ccomp
Q1
RCS
C7 R14
D3 +
C6
OUT
AC
Input
F1
VR1
DB1
AL1663 Flyback Application Circuit
L1
C1 C2 RTH
T1
R11 C6
OUT
Aux R4 D1
Cvcc
R5 D4
VCC PWMD APWM
FB OUT
AL1663
R9
R6 COMP
Rcomp
GND
CS
Ccomp
D3
Q1
RCS
AC
Input
F1
VR1
DB1
AL1663 Buck-Boost Application Circuit
L1
C1 C2
RTH
T1
C5
R10
D2
Aux R4 D1
Cvcc
R5 D4
VCC NC APWM
FB OUT
AL1663R
R9
R6 COMP
Rcomp
GND
CS
U1
Ccomp
Q1
RCS
C7 R14
D3 +
C6
OUT
AL1663R Flyback Application Circuit
AL1663/AL1663R
Document number: DS38466 Rev. 2 - 2
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AL1663/AL1663R
Pin Descriptions
Pin Number
AL1663
1
2
AL1663R
8
1
37
43
54
65
76
82
Pin Name
Function
APWM
PWMD
NC
COMP
CS
GND
OUT
VCC
FB
Analog dimming input pin or PWM signal input pin in PWM dimming mode
PWMD signal input pin in PWM-to-DC dimming mode
Not Connected
Loop compensation pin
Current sense pin, connect this pin to the source of the primary switch
Ground
Gate driver output
Supply voltage of gate driver and control circuits of the IC
The feedback voltage sensing from the auxiliary winding
Functional Block Diagram
2
PWMD
Buffer
APWM
1(8)
DIM VREF
Control
VCC
7(6)
UVLO
&Bias
VREF
8(2)
FB
OVP
Valley
Detector
1.2V
-
+ OCP
4(3)
CS
VREF
-
Gm
+
3(7)
COMP
OTP
Logical
Control
TFP
Driver
6(5)
OUT
TFP Temperature
OTP Detector
5(4)
GND
A(B)
A for AL1663
B for AL1663R
AL1663/AL1663R
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AL1663/AL1663R
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 4)
Symbol
VCC
VCS
VFB
VCOMP
VOUT
VPWMD
VAPWM
TJ
TSTG
TLEAD
PD
θJA
θJC
Parameter
Power Supply Voltage
Voltage at CS to GND
FB Input
Loop Compensation Pin
Driver Output Voltage
Voltage at PWMD to GND
Voltage at APWM to GND
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10 sec)
Power Dissipation at TA = +50ºC
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case)
ESD (Human Body Model)
CDM (Charged-Device Model)
Rating
-0.3 to 30
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 20
-0.3 to 7
-0.3 to 7
-40 to +150
-65 to +150
+300
0.65
150
23
2000
1000
Unit
V
V
V
V
V
V
V
ºC
ºC
ºC
W
ºC/W
°C/W
V
V
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. All voltages unless otherwise stated and measured with
respect to GND.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Note:
Symbol
Parameter
Min Max
TA Ambient Temperature (Note 5)
-40 +105
5. The device may operate normally at +125°C ambient temperature under the condition not triggers temperature protection.
Unit
°C
AL1663/AL1663R
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AL1663/AL1663R
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Condition
UVLO Section
VCC_TH
Startup Threshold Voltage
VOPR_MIN
Minimal Operating Voltage
VCC_OVP
VCC OVP Voltage
Standby Current Section
IST Startup Current
ICC
ICC_OVP
Operating Current
Shunt Current in OVP Mode
After Turn On
VCC = VCC_TH -0.5V, before start
up
FB, CS connect to GND, CGATE =
100pF
VCC > VCC_OVP
Drive Output Section
tR
tF
VOUT_CLAMP
tON_MIN
tON_MAX
tOFF_MAX
tOFF_MIN
fMAX
Internal CS reference
Output Voltage Rise Time (Note 6)
Output Voltage Fall Time (Note 6)
Output Clamp Voltage
Minimum On Time (Note 6)
Maximum On Time
Maximum Off Time
Minimum Off Time
Maximum Frequency
VREF
VCS_OCP
Error Amplifier
Internal Reference Voltage
Primary Current Clamp Voltage
Gm Trans-Conductance
ISOURCE
Amplifier Source Current
Feedback Input Section
VFB_CV
APWM Section
FB CV Threshold
VAPWM_L
VAPWM_H
PWM Signal Low Threshold Voltage
PWM Signal High Threshold Voltage
Linear Dimming Range on APWM
CL = 1nF
CL = 1nF
VCC = 20V
PWMD Section
VPWM_L
PWM Signal Low Threshold Voltage
VPWM_H
PWM Signal High Threshold Voltage
Thermal Fold-back Section
TREG
Overheating Temperature Regulation
(Note 6)
Over Temperature Protection Section
Shutdown Temperature (Notes 6, 7)
Notes: 6. These parameters, although guaranteed by design, are not 100% tested in production.
7. The device will latch when OTP happens and the device won’t operate constantly at this temperature.
AL1663/AL1663R
Document number: DS38466 Rev. 2 - 2
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Min
17
7
25
13
0.291
1.4
2.4
0.3
2
Typ
18.5
7.8
27
0.8
1
5
90
30
14
400
22
35
2
150
0.3
1.2
16.7
10
1.5
+145
+165
Max Unit
20
8.5
29.9
V
V
V
µA
mA
mA
ns
ns
15 V
ns
µs
µs
µs
kHz
0.309
V
V
µA/V
µA
1.6 V
0.3 V
V
2.4 V
0.4 V
V
oC
oC
March 2017
© Diodes Incorporated