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WS3620 Product Description
WS3620 Single Channel LED Constant Current Dr
iver
Driver
Features
General Description
■ Output current adjustable
WS3620 is a single channel LED constant current driver
■ Inter-chip output current deviation <±4%
which integrates patented constant current setting and
■ Over temperature protection
■ Sharing PCB board with LED lamps
control technology. The output current designed by
■ Excellence EMI performance
external REXT is 5mA~60mA and it is invariant to output
■ Simple circuit and low cost
voltage change, which has better constant current
performance.
Applications
It is a low cost circuit with simple circuit and less external
■ T5/T8 LED tubers
components.
■ LED street lighting
WS3620 TO252 and ESOP-8 Package。
■ LED bulb lamp,LED ceiling lamp
LED-
LED+
Typical Application Diagram
1
OUT
2
GND
3
RE X T
R1
AC
W/T-DE033-Rev.A/0 May.2014
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[email protected] Microelectronics Co., Ltd., All right reserved.
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WS3620 Product Description
n Definition and Device Marking
Pi
Pin
WS620 is available in TO252 and ESOP-8 package:
2
REXT
3
RE X T1 2
GND2 3
RE X T2 4
8
WS3620E8P
GND
GND1 1
AXB YM
1
WS3620DP
AXB YM
OUT
NC
WS3620:
A: product code
7 OUT1
X:Inner code
6 N C
B:region code
5
OUT2
YM:year code,month code
Pin Function Description
Pin Name
Pin Number
Function Description
OUT
1
Power input and constant current output
GND
2
GND
REXT
3
Output current setting port
Function Block
OUT
0 .6 V
5V
REF
+
VDD G EN
EA
Temp-Adjust
GND
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WS3620 Product Description
Order Information
Package
IC Marking Information
Purchase Device Name
8-Pin ESOP-8, Pb-free
WS3620E8P
WS3620E8P
2-Pin TO-252, Pb-free
WS3620DP
WS3620DP
Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
VOUT
OUT Voltage
-0.5~250
V
IOUT
OUT Current
1~60
mA
VREXT
REXT Voltage
-0.5~7
V
TJ
Operating junction temperature
150
℃
TSTG
Storage temperature
-55~150
℃
Note
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.
Thermal Resistance Parameter
symbol
Description
ESOP8
TO252
Unit
RTHJA
Thermal resistance
89.2
74.9
℃/W
Note:Chip to be welded on the PCB plate with 200mm2 copper foil ,thickness of copper foil is 35um。
Electrical Characteristics (TA=25℃,OUT=10V if not otherwise noted))
Symbol
VOUT_MIN
VOUT_BV
Parameter
Condition
Minumum Voltage of
OUT Pin
The breakdown voltage
of OUT Pin
Min
Typ
IOUT=30mA
IOUT=0
Max
Unit
6.5
V
250
V
IOUT
Output current
VCC Rise
5
Iop
Operation Current
VOUT=10V,REXT floating
0.16
VREXT
REXT voltage
VOUT=10V
0.6
V
DIOUT
IOUT deviation
IOUT=20mA
±4
%
120
℃
Over-temperature
TSC
Protection point
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60
mA
0.25
mA
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WS3620 Product Description
Function Description
Input Capacitor
Output Current Setting
The larger capacitance C2 produces smaller voltage ripple
Output current can be set by Rext Resistor, the formula is:
to Vin, and keeps small ripple to SM2082 output
voltage. C2 capacitance depends on total operating current
V
0.6
Iout = REXT =
Re xt Re xt
from LED tubes: the more current generates the
more C2 capacitance (usually 4.7uF/400V~22uF/400V). The
formula is shown below:
Efficiency Design
C=
Below shows the application circuit efficiency formula:
η=
t * I LED
∆V
ILED is output current, time t = 1/4/Fac=5mS, △V is output
voltage ripple。
PLED n * VLED * I LED n * VLED
=
=
PIN
VIN * I LED
VIN
Vin is system input power voltage. VLED is single LED drop
Increase Output Power
voltage. ILED is LED current. It is can be seen thatlarger
quantities of series LED in system brings higher efficiency.
In system design,WS3620 output operating voltage is based
on application environment so that it optimizes N value.
The quantity of chip is based on the amount of parallel
connection groups and lights operating current of LED tubes.
In the diagram below, resistor of REXT1~REXT2 can be the
same or different.
In IC parallel application, when Rext value is different, the
LED Series Number Design
constant current turn-on voltage in the system is the
maximum voltage of parallel WS3620.
Designing LED series number in the system should consider
two aspects below:
1 OUT
output voltage is VOUT = Vin – n*VLED.
2 GND
IC 1
3 R EXT
(1) To ensure the normal operation, output voltage should
R ex t1
be VOUT > VOUT_MIN;
(2) Lower output voltage brings higher system efficiency.
LE D 1-1
LE D 1-n
LE D 2-1
LE D 2-n
2 GND
Basing on the two points above, WS3620 output voltage
range is VOUT_MIN ~ VOUT_MAX and LED series number
R ex t2
C3
Vin − VOUT _ MAX
VLED
<n<
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1 OUT
Vin − VOUT _ MIN
2 GND
VLED
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IC 2
3 R EXT
C2
formula is:
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1 OUT
220V~
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3 R EXT
R ex t N
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WS3620 Product Description
TO-252 Package Information
6
A4
A3
5
B1
B
4
D
H
A1
D2
C2
A2
D3
b
2
1
A
C1
0<a,b<0.1
C
D3
a
D1
3
R
Dimensions In Millimeters
Symbol
Min.
Max.
A
6.50
6.70
A1
0.71
A2
Symbol
Dimensions In Millimeters
Min.
Max.
D1
1.40
1.60
0.81
D2
0.81
0.91
2.236
2.336
D3
A3
5.284
5.384
H
A4
0.75
0.85
R
0.40TYP
B
6.00
6.20
θ1
0°-8°
B1
9.80
10.10
θ2
8.5°TYP
C
2.20
2.40
θ3
25°TYP
C1
0.967
1.087
θ4
10°TYP
C2
0.498
0.518
θ5
10°TYP
D
0.70
0.90
θ6
70°TYP
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0.05TYP
0.00
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0.10
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WS3620 Product Description
ESOP-8 Package Information
E
D1
e
D
E2
b
A1
A2
A
E1
c
L
Dimensions In Millimeters
Symbol
Dimensions In Inches
Min.
Max.
Min.
Max.
A
1.350
1.750
0.053
0.069
A1
0.050
0.150
0.004
0.010
A2
1.350
1.550
0.053
0.061
b
0.330
0.510
0.013
0.020
c
0.170
0.250
0.006
0.010
D
4.700
5.100
0.185
0.200
D1
3.202
3.402
0.126
0.134
E
3.800
4.000
0.150
0.157
E1
5.800
6.200
0.228
0.244
E2
2.313
2.513
0.091
0.099
e
1.270(BSC)
0.050(BSC)
L
0.400
1.270
0.016
0.050
θ
0°
8°
0°
8°
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WS3620 Product Description
NOTE:
1.We strongly recommend customers check carefully on the trademark when buying our product, if there is any
question, please don't be hesitate to contact us.
2.Please do not exceed the absolute maximum ratings of the device when circuit designing.
3.Winsemi Microelectronics Co., Ltd reserved the right to make changes in this specification sheet and is
subject to change without prior notice.
CONTACT:
Winsemi Microelectronics Co., Ltd.
ADD:Futian District, ShenZhen Tian An Cyber Tech Plaza two East Wing 1002
Post Code : 518040
Tel : +86-755-8250 6288
FAX : +86-755-8250 6299
Web Site : www.winsemi.com
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