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AL1677

HIGH EFFICIENCY AND ACCURACY LED DRIVER CONVERTER


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AL1677 pdf
AL1677
UNIVERSAL, HIGH EFFICIENCY AND ACCURACY LED DRIVER CONVERTER
Description
The AL1677 is a universal AC-input (85~277 VAC), high-efficiency and
high-accuracy Buck LED-driver converter. The AL1677 topology
provides accurate constant current (CC) 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 AL1677 system removes the auxiliary winding and external high-
voltage MOSFET with few external components to create a low bill of
material (BOM) cost solution. The AL1677 has rich protection features
to enhance system safety and reliability. With thermal foldback
function, the AL1677 can reduce output current when the drivers
temperature is higher than the setting value.
Pin Assignments
(Top View)
GND 1
ROVP 2
NC 3
VCC 4
8 CS
7 CS
6D
5D
SO-8
The AL1677 is available in SO-8 package.
Features
> 90% Efficiency
Valley Detection to Minimize Switching Loss
Universal 85 to 277 VAC Input Range
Internal MOSFET up to 500V
Tight Current Sense Tolerance : ± 3%
Low Startup Current: 170µA
Low Operation Current: 100µA (Static)
Standard Inductor (no auxiliary winding)
Internal Protections
- Undervoltage Lockout (UVLO)
- Leading-Edge Blanking (LEB)
- Cycle-by-cycle Overcurrent Protection(OCP)
- Output Open/Short Protection(OVP/OSP)
- Open-Load and Reload Detection
- Thermal Foldback Function(TFP)
- Over-Temperature Protection(OTP)
SO-8 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Retrofit LED Lamps
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.
AL1677
Document number: DS37526 Rev. 1 - 2
1 of 13
www.diodes.com
November 2015
© Diodes Incorporated



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AL1677 pdf
Typical Applications Circuit
AC
Input
F1
DB1
C1
R1
D1
R4
+
C3
OUT
L1
R2
C2
R3
4 VCC D 5
3 NC
6
D
2 ROVP CS 7
1 GND CS 8
U1 AL1677
R5
Pin Descriptions
Pin Number
1
2
3
4
5,6
7,8
Pin Name
GND
ROVP
NC
VCC
D
CS
Ground
Setting the Open Voltage of the Output
No Connection
Power Supply for the Device
Internal High Voltage MOSFETs Drain
Current Sensing
Function
AL1677
Functional Block Diagram
VCC 4
STOP
Fault
Management
OVP OSP OTP
OFF
UVLO
VCC
Management
VCC
Clamp
VOVP_REF VREF
2
ROVP
NC 3
OVP
OVP
TOFF
VOVP_REF
S
R
Q
OSP
TOFF
Toff Detection
(ZCD)
1
GND
STOP
Constant
Current Control
Max Ton
Limit
LEB
5,6 D
7,8
CS
AL1677
Document number: DS37526 Rev. 1 - 2
2 of 13
www.diodes.com
November 2015
© Diodes Incorporated



Part Number AL1677
Description HIGH EFFICIENCY AND ACCURACY LED DRIVER CONVERTER
Maker Diodes - Diodes
Total Page 13 Pages
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