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WS3410 Product Description
WS3410 Active PFC Non-isolated Buck LED Driver
General Description
Features
�
High
Power
Factor
Correction,
Low
The WS3410 is designed for active PFC non-isolated buck
Total
Harmonic Distortion
LED driver. It operates at valley switching mode with high
�
Dynamic Temperature Compensation
efficiency, low EMI and High PF. The output current
�
No Auxiliary Winding For Supplying
automatically adapt to the variation of the inductance and the
�
Valley Switching, High efficiency, Low EMI
output voltage. The truly constant current LED is realized.
�
Automatic Compensate the Inductance Variation
The WS3410 using SOT23-6 package,It can achieve
�
Automatic Adapt to the Change of Output Voltage
excellent constant current performance with very few external
�
LED Short Circuit Protection
components.
�
Over Voltage Protection
The WS3410 offers rich protection functions, including over
�
Over Temperature Protection
voltage protection, LED short circuit protection, cycle by
�
Open Circuit Protection
cycle current limiting, dynamic temperature compensation,
�
Few External Components
over temperature protection and soft start.
WS3410 consumes very low start current and operation
current,
driving
LED
efficiently
under
universal
AC
input(85VAC~265VAC).
WS3410 is available in SOT23-6 package.
Applications
�
LED Driver Supply
Typical Application Circuit
6
FB
G AT E
4
CS
5
1 VCC
3 C OM P
GND 2
W/T-Y0037-Rev.A/ 0 May.2014
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[email protected] Microelectronics Co., Ltd., All right reserved.
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WS3410 Product Description
Pin Definition and Device Marking
WS3410 is available in SOT23-6 package.
SOT23- 6
1 VCC
FB
6
2 GND
CS
5
6
10: WS3410
Y: Year 4=2014,
.1 0 Y M F
3 COMP
M: Month 1,2…A=10,B=11,C=12
F: Factory No.
G AT E 4
Pin Function Description
Pin Name
Pin NO.
Description
VCC
1
Power supply
GND
2
Ground
COMP
3
Loop compensation, with a cap to GND.
GATE
4
Driver output pins
CS
5
Current sampling end
FB
6
Feedback signal input.
Block Diagram
VCC
FB
1
G ND
6
2
8.0V
OVP
UVLO
Inter
supply
Zero-Current
Detect
Temperature
control
L o g ic
&
driver
PFC
control
OTP
200m V
CO M P 3
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Current
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G AT E
1V
EA
1 .5 V
low-clamp
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WS3410 Product Description
Ordering Information
Package
6-Pin SOT23-6,
Part Number
Marking
10YMF
WS3410YP
Pb-free
Absolute Maximum Ratings
symbol
parameter
Range
Units
-0.3~Vcc_clamp
V
VCC
The power supply voltage input
Gate
Drive output
-0.3~8
V
VCS
CS current sampling voltage
-0.3~7
V
VFB
Feedback voltage input
-0.3~7
V
VCOMP
Loop Compensation Pin voltage
-0.3~7
V
PDMAX
Power dissipation
0.5
W
TJ
Max. Operating junction temperature
150
℃
TSTG
Max./Min. Storage temperature range
-55~150
℃
Note:Limit parameter exceed the stated in the table will cause device damage. Do not recommend conditions the device work in
more than the limit, in extreme conditions, may affect device reliability.
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WS3410 Product Description
Electrical Characteristics (Unless otherwise specified,TA=25℃,VCC=8V)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
7.5
8.0
8.5
V
5
mA
Supply Voltage Section
Vcc_clamp
VCC Clamping Voltage
Icc_clamp
VCC Clamping Current
VCC_ST
VCC Start Up Voltage
Vuvlo_HYS
VCC Under Voltage
Latch Out Hysteresis
Ist
Start Up Current
Iop
Operation Current
VCC Rise
7.5
V
VCC Falling
1.25
V
VCC<VCC_ST-0.5V
70
100
uA
400
uA
1
V
Current Sensor Section
Vocp
Current Sensor Voltage Threshold
TLEB
Leading Edge Blanking
350
ns
Td
Turn Off Delay Time
200
ns
Loop Compensation Section
VREF
Internal Reference Voltage
194
200
206
mV
Internal Reference Voltage
TOFF_MIN
Min. Demagnetization Time
3
us
TON_MAX
Max. On Time
20
us
Feedback input Section
VFB
OVP Threshold Voltage
1.6
V
VZCD
Zero Crossing Checking Threshold
0.2
V
Drive Section
VOH
Output voltage high
VCC=8V,Io=20mA
7
V
VOL
Output voltage low
VCC=8V,Io=-20mA
Tr
Rising time
VCC=8V,Cgate=1nF
200
ns
Tf
Falling time
VCC=8V,Cgate=1nF
80
ns
0.5
V
Over Temperature Section
TSD
Thermal Shut Down Temperature
160
℃
TSD_HYS
Thermal Shut Down Hysteresis
30
℃
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WS3410 Product Description
Function Description
Sence Resistor
The WS3410 is designed for active PFC non-isolated buck
The WS3410 is designed for active PFC non-isolated buck
LED driver, using SOT23-6 package, It operates under
LED driver. It operates under
valley switching mode, automatically adapting to the
variation of the inductance and the output voltage. It can
achieve excellent constant current performance with very
few external components.
valley switching mode and
can achieve high accuracy constant current performance
with very few external components. The peak current of
inductor is continuous detected. CS terminal is connected
internal of the chip, and compared with the internal 200mV.
Internal Amplifier’s output COMP adjust the on-time, making
the average value so CS equal to 200mV after the system is
stable. In addition, a 1V cycle-by-cycle over current
Start up
The start current is very low, Typ. 70uA(Max. 100uA). Under
protection is set up inside CS pin.
LED output current:
the design system of 85VAC, the startup resistor is:
I LED =
85 * 2
R=
= 1.2 M
100
0.2V
RCS
FB Voltage Detection
Chip Supply
After startup, the output voltage should supply the chip,
rectifier diodes D6 need to use fast recovery diodes.Current
FB voltage determines the working status of the system,
when
FB
is
greater
then
1.6V(typ.),
WS3410
will
automatically considered as output over voltage protection.
limiting resistor R4 is calculated as:
The system will enter extremely energy efficient hiccup
V −9
R4 = (1 − D ) * LED
400uA
mode. Output over voltage protection voltage as follows:
VOVP = 1.6 *
Where, D is duty cycle, 400uA is the normal operation
R2 + R3
R3
current of the chip, Vled is output load voltage. The
consumption of R4 is:
PR 4 =
R2,R3,please refer to the typical application diagram, in
(VLED − 9)
2
R4
which R3=10k(Not over 15 K, not less than 8.2 K). use 1.3
* (1 − D)
instead of constant 1.6 in the above formula in the design of
system. Assuming Vovp=90V, we got R2=552k from the
For example:
above formula, choosing 560k for R2 (larger as far as
Requirements:180~260V input voltage, 36~80V output,
possible).Because VFB2 is between 1.3 and 1.9, choose 1.9
240mA output current.
to
calculate
the
withstand
voltage
of
C4,
Vovp=1.9*(10+560)/10=108V,The withstand voltage of C4
The R4 design of above program should be met:
1. Supply Problem when Min. input AC voltage 180V and
Min. output voltage 36V(which is the weakest power supply):
D=36/180/1.414=0.141,R4=(1-0.141)*(36-9)/400uA=58k
shoule larger than the above value, 200V capacitor could be
used. WS3410 will automatic detect the output voltage when
enters hiccup mode; and will re-enter the normal working
state when the output voltage is lower than Vovp.
2.Power consumption problem of R4 when Max. input AC
voltage 260V and Max. output voltage 80V(which is the
Output Open(Short) protection
strongest power supply):
Output open/short protection is integrated inside WS3410.
D=80/260/1.414=0.218
Once output open/short circuit is detected, the system will
The power consumption of R4:
automatic enter hiccup mode until the protection signal
P=(80-9)*(80-9)/58*(1-0.218)=68mW
disappear.
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WS3410 Product Description
Over Temperature Automatic adjustment of output
can get high PF value and low THD.
current
WS3410 has over temperature regulating function, gradually
PCB Design
reducing the output current when the power is over
The following guidelines should be followed in WS3410 PCB
temperature, so as to control the output power and the
layout:
temperature rise, keeping the power temperature in a setting
Bypass Capacitor: The bypass capacitor on VCC pin should
value in order to improving the reliability of the system. The
be as close as possible to the VCC and GND pins.
starting regulation temperature is 135℃.
Ground Path: The power ground path for current sense
should be short, and the power ground path should be
Input Filter Capacitor
separated from small signal ground path before the negative
In order to obtain high PF value, the input capacitor can not
be too large. 10-100nF is recommended.
node of the bulk capacitor.
The Area of Power Loop: The area of power loop should be
as small as possible to reduce EMI radiation.
Power Factor Correction
Active PFC control circuit is integrated in WS3410, which
And the controller should be placed away from the heat
generator, such as the power diode.
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WS3410 Product Description
Package Information
SOT23-6 Package Outline Dimensions
U n it:m m
A
C2
B1
B
θ1
θ
B2
A2
R
C
D
R1
θ2
C1
θ3
R2
D2
A1
D1
D3
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Dimensions in Millimeters
Symbol
Dimensions in Inches
Min
Max
Min
Max
A
2.72
3.12
0.107
0.123
B
1.40
1.80
0.055
0.071
C
1.00
1.20
0.039
0.047
A1
0.90
1.00
0.035
0.039
A2
0.30
0.50
0.012
0.020
B1
2.60
3.00
0.102
0.118
B2
0.119
0.135
0.005
0.005
C1
0.03
0.15
0.001
0.006
C2
0.55
0.75
0.022
0.030
D
0.03
0.13
0.001
0.005
D1
0.30
0.60
0.012
0.024
D2
0.25TYP
D3
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0.024
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0.028
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WS3410 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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