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AL1676

UNIVERSAL HIGH POWER FACTOR BUCK LED DRIVER



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AL1676 pdf
AL1676
UNIVERSAL HIGH POWER FACTOR BUCK LED DRIVER
Description
The AL1676 is a universal AC input (85~277 VAC), high power factor
(PF) and high efficiency Buck LED driver. The AL1676 topology
provides accurate constant current (CC) with good line and load
regulation, operating at boundary conduction mode (BCM) to ease in
EMI/EMC qualification and testing to meet the latest regulatory laws.
The AL1676 single Buck stage driver works with a single winding
inductor and High voltage MOSFET included, therefore, can use
fewer external components and create a low bill of material (BOM)
cost solution. The AL1676 has rich protection features to enhance
system safety and reliability, including under voltage lock out (UVLO),
LED open/short, over voltage, over current, over temperature
protection and thermal fold-back function which can reduce output
current when the drivers temperature is higher than the setting value.
Pin Assignments
(Top View)
VCC 1
ROVP 2
COMP 3
GND 4
7D
6 NC
5 CS
SO-7
The AL1676 is available for SO-7 package.
Features
>90% Efficiency
Universal 85 to 277 VAC Input Range
Multiple Options for Internal MOSFET
Tight Output Current Tolerance: ±3%
Low Startup Current: 100µA
Low Operation Current: 170µA (5KHs Switching)
Single Winding Inductor
Internal Protections:
Under Voltage Lock Out (UVLO)
Leading-Edge Blanking (LEB)
Cycle-by-cycle Over Current Protection (OCP)
Output Open/Short Protection (OVP/OSP)
Thermal Fold-back Protection (TFP)
Over Temperature Protection (OTP)
SO-7 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Retrofit LED Lamps
LED Tube
High Voltage DC-DC LED Driver
General Purpose Constant Current Source
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.
AL1676
Document number: DS38290 Rev. 1 - 2
1 of 15
www.diodes.com
February 2016
© Diodes Incorporated



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AL1676 pdf
Typical Applications Circuit
L1
AC
Input
F1
DB1
C1
C2
AL1676
R1
R2
VR
C3 R3 C4
U1 AL1676
VCC
ROVP
D
COMP NC
GND CS
R4
D1
L2
C5
+
R5
OUT
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
Pin Name
VCC
ROVP
COMP
GND
CS
NC
D
Function
Power supply voltage
Resistor set the open voltage
Compensation for current control
Ground
Current sensing
No connection
Drain of the internal high voltage MOSFET
Functional Block Diagram
VCC 1
STOP
Fault
Management
OFF
UVLO
2
ROVP
COMP 3
OSP OTP OVP
OVP
OVP
tOFF
VOVP_REF
S
R
Q
STOP
+
-
GND 4
ManaVgCeCment
VCC
Clamp
VDD
VOVP_REF VREF
OSP
tOFF
tOFF Detection
(ZCD)
VCC
Driver Supply
Clamp
OCP
- 0.8V
+
+
Gm
-
VREF
Sample and
Hold
7D
6
NC
5 CS
AL1676
Document number: DS38290 Rev. 1 - 2
2 of 15
www.diodes.com
February 2016
© Diodes Incorporated



Part Number AL1676
Description UNIVERSAL HIGH POWER FACTOR BUCK LED DRIVER
Maker Diodes - Diodes
Total Page 15 Pages
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