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AL1666 Datasheet

HIGH PERFORMANCE DIMMABLE LED CONTROLLER

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AL1666
HIGH PERFORMANCE DIMMABLE LED CONTROLLER
Description
The AL1666 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 which results
in good EMI and efficiency, and keeps high PF and low THD under
universal input voltage.
The AL1666 can support analog/PWM dimming modes. When a 0 to
2.4V DC signal is applied on ADIM pin, the device will operate in
analog dimming mode; when a digital signal is applied on PWMD pin
and the ADIM pin is connected with hundreds of nF capacitors, the
device will work at PWM-to-DC dimming mode. The dimming range is
1% to 100%.
Pin Assignments
(Top View)
ADIM 1
PWMD 2
COMP 3
CS 4
8 FB
7 VCC
6 OUT
5 GND
The AL1666 has rich protection features. It integrates multiple
protections including Under Voltage Lock Out (UVLO), Output Over
Voltage Protection (OVP), Output Short Circuit Protection (OSP),
Over Current Protection (OCP), Winding Short Circuit, Secondary
Diode Short, Internal Thermal Fold-Back Protection (TFP) and Over
Temperature Protection (OTP).
The AL1666 is available in SO-8 (Standard) package.
Features
Primary Side Regulation without Opto-Coupler
Valley Switching for Low Switching Loss
Support Analog and PWM-to-DC Dimming
Analog/PWM-to-DC Dimming Range: 1% to 100%
Tight CS Reference Voltage 0.4V±1.5%
High PF>0.9 and Low THD<20%
High Efficiency
Internal Protections
Under Voltage Lock Out (UVLO)
Output Over Voltage Protection (OVP)
Output Short Protection (OSP)
Over Current Protection (OCP)
Winding Short Circuit Protection
Secondary Diode Short Protection
Internal Thermal Fold-back Protection (TFP)
Over Temperature Protection (OTP)
Tight LED Current Variation Range
LED Current Line Regulation: ±2% (90VAC to 305VAC)
LED Current Load Regulation: ±2% Full Load to Half Load
Package: SO-8 (Standard)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
For automotive applications requiring specific change
control (i.e. parts qualified to AEC-Q100/101/200, PPAP
capable, and manufactured in IATF 16949 certified facilities),
please contact us or your local Diodes representative.
https://www.diodes.com/quality/product-definitions/
SO-8 (Standard)
Applications
General LED Lighting Driver with Dimming Function
0 to 10V Dimming Luminaires
General Purpose Constant Current Source
Smart LED Lighting
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.
AL1666
Document number: DS42417 Rev. 1 - 2
1 of 16
www.diodes.com
December 2019
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AL1666 Datasheet

HIGH PERFORMANCE DIMMABLE LED CONTROLLER

No Preview Available !

AL1666
Typical Applications Circuit
AC
Input
F1
VR1
DB1
L1
C1 C2
RTH
T1
R10 C5
C7 R14
D3
R11
+
C6
OUT
Aux
D2
R4 D1
R5
CVCC
PWM Signal
VCC
PWMD
D4
FB OUT
AL1666
R9
R6 COMP
RCOMP
ADIM GND CS
U1
CCOMP
CDIM
Q1
RCS
AC
Input
F1
VR1
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
Flyback Application Circuit
DB1
L1
C1 C2 RTH
T1
R11 C6 OUT
Aux
R4
R5
R6
D1
CVCC
RCOMP
CCOMP
PWM Signal
VCC
PWMD
FB
AL1666
COMP
OUT
ADIM
GND CS
D4
R9
CDIM
D3
Q1
RCS
Buck-Boost Application Circuit
Pin Name
ADIM
PWMD
COMP
CS
GND
OUT
VCC
FB
Analog dimming input pin
Function
PWM signal input pin
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
AL1666
Document number: DS42417 Rev. 1 - 2
2 of 16
www.diodes.com
December 2019
© Diodes Incorporated


Part Number AL1666
Description HIGH PERFORMANCE DIMMABLE LED CONTROLLER
Maker Diodes
Total Page 16 Pages
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