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Diodes Semiconductor Electronic Components Datasheet

AL1678-08B Datasheet

500V BUCK LED DRIVER

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AL1678-08B pdf
AL1678-20B/10B/08B
UNIVERSAL, 500V BUCK LED DRIVER
Description
The AL1678-20B/10B/08B is a universal AC input (85 to 277 VAC),
high efficiency and high accuracy Buck LED driver. The AL1678-
20B/10B/08B topology provides accurate constant current over line
and load regulation with tight tolerance ±3%, operating at boundary
conduction mode (BCM) to ease in EMI/EMC qualification and testing
to meet the latest regulatory laws.
The AL1678-20B/10B/08B single Buck stage system 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 AL1678-20B/10B/08B has rich
protection features to enhance the system safety and reliability. It has
thermal fold back function, which can reduce the output current when
the driver’s temperature is higher than the setting value.
The AL1678-20B/10B/08B is available in SO-7 package.
Features
> 90% Efficiency
Valley Switching to Achieve Low Switching Loss
Universal 85 to 277 VAC Input Range
Internal MOSFET up to 500V
Tight Current Sense Tolerance: ±3%
Low Start-up Current: 170µA
Low Operation Current: 100µA (Static)
Single Winding Inductor
Internal Protections
Under Voltage Lock Out (UVLO)
Leading-edge Blanking (LEB)
Output Open/Short Protection
Open-load and Reload Detection
Thermal Fold-back Function
Over Temperature Protection (OTP)
SO-7 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
OUT 1
VCC 2
ROVP 3
GND 4
7 Drain
6 LC
5 CS
SO-7
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.
Typical Applications Circuit
AC
Input
F1
DB1
C1
R1
D1
R4
C3
+
OUT
L1
R2
R3
C2
1 OUT Drain 7
2 VCC
3
ROVP
LC 6
4 GND CS 5
U1 AL1678-20B/10B/08B R5
AL1678-20B/10B/08B
Document number: DS37637 Rev. 1 - 2
1 of 13
www.diodes.com
April 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL1678-08B Datasheet

500V BUCK LED DRIVER

No Preview Available !

AL1678-08B pdf
Pin Descriptions
AL1678-20B/10B/08B
Pin Number
1
2
3
4
5
6
7
Pin Name
OUT
VCC
ROVP
GND
CS
LC
Drain
Internal power MOSFET’s source
Power supply for the device
Setting the open voltage of the output
Ground
Current sensing
Line compensation pin
Internal high voltage MOSFET’s drain
Function
Functional Block Diagram
STOP
Fault
Management
UVLO
3
ROVP
OTP
VCC
OVP
Output
OVP
5
CS
LEB
Constant
Current Control
Max ton
Limit
VCC
2
VCC
Management
VCC
Clamp
toff Detection
(ZCD)
SQ
R
STOP
4
GND
Drain
7
1
OUT
6
LC
AL1678-20B/10B/08B
Document number: DS37637 Rev. 1 - 2
2 of 13
www.diodes.com
April 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL1678-08B Datasheet

500V BUCK LED DRIVER

No Preview Available !

AL1678-08B pdf
AL1678-20B/10B/08B
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 4)
Symbol
Parameter
Rating
Unit
VCC Power Supply Voltage
18 V
AL1678-20B
500 V
VDrain
Voltage on Drain Pin
AL1678-10B
500 V
AL1678-08B
500 V
AL1678-20B
Continuous Drain Current
ID
(TC = +25oC)
AL1678-10B
AL1678-08B
2.0 A
1.0 A
0.8 A
VCS Voltage on CS Pin
-0.3 to 7
V
VROVP
Voltage on ROVP Pin
-0.3 to 7
V
TJ Operating Junction Temperature
-40 to +150
ºC
TSTG
Storage Temperature
-65 to +150
ºC
TLEAD
PD
θJA
Lead Temperature (Soldering, 10 sec)
Power Dissipation and Thermal Characteristics
(TA = +50oC)
Thermal Resistance (Junction to Ambient)
+260
0.65
190
ºC
W
ºC/W
Note 4:
ESD (Human Body Model)
ESD (Machine Model)
2000
200
V
V
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
Min Max
Note 5:
TA Ambient Temperature (Note 5)
-40 +105
The device can operate normally at +125°C ambient temperature under the condition that the junction temperature is less than +150°C.
Unit
°C
AL1678-20B/10B/08B
Document number: DS37637 Rev. 1 - 2
3 of 13
www.diodes.com
April 2015
© Diodes Incorporated




Part Number AL1678-08B
Description 500V BUCK LED DRIVER
Maker Diodes
Total Page 13 Pages
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