WS308 Datasheet PDF - Winsemi


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WS308
Winsemi

Part Number WS308
Description LED lighting driver
Page 5 Pages

WS308 datasheet pdf
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WS308 Product Description
Features
Adaptive current ripple eliminating
Adjustable LED current ripple range
Settable LED voltage maximum
Applications
LED lighting
Typical Application Circuit
General Description
WS308 is applied for LED lighting driver, can eliminate the
current ripple produced by preceding driver.
With WS308 and preceding high power factor constant current
control circuit, can realize no-stroboscopic high power factor
LED constant current solution.
Pin Definition and Device Marking
WS308 is available in TO252as shown below
WS308
VC OUT GND
2
13
TO252
1 VC
2 OUT
3 GND
WT-D050-Rev.A0 Feb.2015 WS308_EN



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WS308 Product Description
Pin Function Description
Pin
Name
Pin
Number
Function Description
VC 1 Ripple eliminating circuit control
OUT
2 Ripple eliminating circuit output
GND
3 Ground.
Ordering Information
Package
IC Marking Information
Purchasing Device Name
TO-252, Pb-free
WS308DP
WS308DP
Note: Maximum practical continuous power in an Adapter design with sufficient drain pattern as a heat sink, at 50ambient.
Absolute Maximum Ratings
Symbol
Parameter
VOUT
OUT pin voltage
VC VC pin voltage
TA Operation temperature
Tstg Storage temperature
Rθja Thermal resistance
Value
-0.3~20
-0.3~10
-20~125
-40~150
65
Unit
V
V
/W
Note: Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are
stress ratings only, functional operation of the device at these or any other conditions beyond those indicated in the
Recommended Operating Conditions section are not implied. Exposure to absolute maximum-rated conditions for extended
periods may affect device reliability.
Electrical Characteristics (TA=25, if not otherwise noted)
Symbol
Parameter
Test condition
IOUT
VOUT
ICLMT
OUT pin output current
OUT Pin saturation voltage LED current is 160mA
OUT Pin limit current
Min
0.3
SPEC
Typ
0.3
0.45
Unit
Max
A
0.65 V
1A
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WS308 Product Description
Function Description
WS308 is applied for LED lighting driver, can eliminate the current ripple produced by preceding driver.
With WS308 and preceding high power factor constant current control circuit, can realize no-stroboscopic high power factor LED
constant current solution.
PCB layout notes for use
Copper layout for better heat dissipationadding via hole
WS308 OUT Pin need copper layout for better heat dissipationIf the Two-sided boardthe Copper is needed both top and
bottom layer,can made by interwoven fibers or linear copper clepsydra, for reducing the chip temperature and enhancing
system performance.
Two-sided board PCB heat dissipationthe via hole between top and bottom layer should be as many as possible for heat
dissipation requirement.
Typical Application Solution
Q1
R1
R3
U1
1 VC
R2 C1 R4
2 OUT
R5
3 GND
BOM list
Station
nuRm1ber
R2
R3
Parameter
300R/0805
5.1K/0805
10K/0805
Station
R4
R5
Q1
Parameter
10K/0805
2.2R/1206
S8550
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www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
Station
C1
U1
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Parameter
100uF/10V
WS308
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WS308 Product Description
Package Information
TO-252 Package Information
E
E1
L
b
e
A
F
G
c
Unit:mm
符号
symbol MIN
MAX
A 2.1 2.5
b 0.66 0. 86
c 0.458 0.558
D 5.9 6.3
D1 0.702 1.002
E 6.4 6.8
E1 5.12 5.52
e 2.286TYP
F 0.458 0.558
G 0.9 1.1
L 0.6 1.0
L1 2.548 3.148
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