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AL1678-08B Schematic ( PDF Datasheet ) - Diodes

Teilenummer AL1678-08B
Beschreibung 500V BUCK LED DRIVER
Hersteller Diodes
Logo Diodes Logo 




Gesamt 13 Seiten
AL1678-08B Datasheet, Funktion
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






AL1678-08B Datasheet, Funktion
Performance Characteristics (Note 8)
VCC Clamp Voltage vs. Ambient Temperature
20
18
16
14
12
1-040 -20
0 20 40 60 80
Ambient Temperature (oC)
100 120
Integrated 500V/1A MOSFET SOA (Note 9)
AL1678-20B/10B/08B
VCS Reference vs. Ambient Temperature
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-40 -20 0 20 40 60 80 100 120 140 160 180
Ambient Temperature (oC)
Integrated 500V/2A MOSFET SOA (Note 9)
Notes:
VDS, Drain-to-source Voltage (V)
VDS, Drain-to-source Voltage (V)
8. These electrical characteristics are tested under DC condition. The ambient temperature is equal to the junction temperature of the device.
9. The MOSFET SOA curve is tested under the TO-251 package type.
AL1678-20B/10B/08B
Document number: DS37637 Rev. 1 - 2
6 of 13
www.diodes.com
April 2015
© Diodes Incorporated

6 Page









AL1678-08B pdf, datenblatt
Suggested Pad Layout
(1) Package Type: SO-7
AL1678-20B/10B/08B
GZ
E1
Y
EX
Dimensions
Value
Z
(mm)/(inch)
6.900/0.272
G
(mm)/(inch)
3.900/0.154
X
(mm)/(inch)
0.650/0.026
Y
(mm)/(inch)
1.500/0.059
E
(mm)/(inch)
1.270/0.050
E1
(mm)/(inch)
2.540/0.100
AL1678-20B/10B/08B
Document number: DS37637 Rev. 1 - 2
12 of 13
www.diodes.com
April 2015
© Diodes Incorporated

12 Page





SeitenGesamt 13 Seiten
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