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PDF WS3413 Data sheet ( Hoja de datos )
| Número de pieza | WS3413 | |
| Descripción | Active PFC Non-isolated Buck LED Driver | |
| Fabricantes | WINSEMI | |
| Logotipo |  |
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WS3413 Product Description
WS3413 Active PFC Non-isolated Buck LED Driver
Features
� High Power Factor Correction, Low Total
Harmonic Distortion
� Dynamic Temperature Compensation
� 500V Power MOSFET Integrated
� No Auxiliary Winding For Supplying
� DIP8 Package, Up To 260mA Output Current
� Valley Switching, High efficiency, Low EMI
� Automatic Compensate the Inductance Variation
� Automatic Adapt to the Change of Output Voltage
� LED Short Circuit Protection
� Over Voltage Protection
� Over Temperature Protection
� Open Circuit Protection
� Few External Components
Applications
� LED Driver Supply
General Description
The WS3413 is designed for active PFC non-isolated buck
LED driver. It operates at valley switching mode with high
efficiency, low EMI and High PF. The output current
automatically adapt to the variation of the inductance and the
output voltage. The truly constant current LED is realized.
The WS3413 integrates 500V power MOSFET, using DIP8
package, producing up to 260mA output current.
It can achieve excellent constant current performance with
very few external components.
The WS3413 offers rich protection functions, including over
voltage protection, LED short circuit protection, cycle by
cycle current limiting, dynamic temperature compensation,
over temperature protection and soft start.
WS3413 consumes very low start current and operation
current, driving LED efficiently under universal AC
input(85VAC~265VAC).
WS3413 is available in DIP8 package.
Typical Application Circuit
5D
8
CS
6D
CS 7
3 VCC
FB 4
AC
2 GND
COMP 1
LE D+
LE D-
WIN SEM I M ICROELECTRON ICS
WIN SEM I M ICROELECTRON ICS
WIN SEM I M ICROELECTRON ICS
Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.
WIN SEM I M ICROELECTRON ICS
W/T-D045-Rev.A/ 0 May.2014
WIN SEM I M ICROELECTRON ICS
0514
1 page  
WS3413 Product Description
Function Description
The WS3413 is designed for active PFC non-isolated buck
LED driver, which integrates 500V power MOSFET and
using DIP8 package, producing up to 260mA output current.
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.
Start up
The start current is very low, Typ. 70uA(Max. 100uA). Under
the design system of 85VAC, the startup resistor is:
R = 85 * 2 = 1.2M
100
Chip Supply
After startup, the output voltage should supply the chip,
rectifier diodes D6 need to use fast recovery diodes.Current
limiting resistor R4 is calculated as:
R4
=
(1 −
)D * VLED − 9
400uA
Where, D is duty cycle, 400uA is the normal operation
current of the chip, Vled is output load voltage. The
consumption of R4 is:
PR 4
=
(VLED − 9)2
R4
* (1 −
D)
Sence Resistor
The WS3413 is designed for active PFC non-isolated buck
LED driver. It operates under 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 os CS equal to 200mV after the system is
stable. In addition, a 1V cycle-by-cycle over current
protection is set up inside CS pin.
LED output current:
I LED
=
0.2V
RCS
FB Voltage Detection
FB voltage determines the working status of the system,
when FB is greater then 1.6V(typ.), WS3413 will
automatically considered as output over voltage protection.
The system will enter extremely energy efficient hiccup
mode. Output over voltage protection voltage as follows:
VOVP
= 1.6 * R2 + R3
R3
R2,R3,please refer to the typical application diagram, in
which R3=1k(no more than 2k). use 1.3 instead of constant
1.6 in the above formula in the design of system. Assuming
Vovp=90V, we got R2=56k from the above formula,
For example:
choosing 60k for R2 (larger as far as possible).
Requirements:180~260V input voltage, 36~80V output,
Because VFB2 is between 1.3 and 1.9, choose 1.9 to
240mA output current.
calculate the withstand voltage of C4,
The R4 design of above program should be met:
Vovp=1.9*(1+60)/1=116V
1. Supply Problem when Min. input AC voltage 180V and
The withstand voltage of C4 shoule larger than the above
Min. output voltage 36V(which is the weakest power supply):
value, 200V capacitor could be used.
D=36/180/1.414=0.141,R4=(1-0.141)*(36-9)/400uA=58k
The WS3413 uses the patent source driver structure. The
2.Power consumption problem of R4 when Max. input AC
typical operation current is as low as 200uA, the auxiliary
voltage 260V and Max. output voltage 80V(which is the
winding is not need. So the system design is simple and the
strongest power supply):
cost is low.
D=80/260/1.414=0.218
WS3413 will automatic detect the output voltage when
The power consumption of R4:
enters hiccup mode; and will re-enter the normal working
P=(80-9)*(80-9)/58*(1-0.218)=68mW
state when the output voltage is lower than Vovp.
WIN SEM I M ICROELECTRON ICS
WIN SEM I M ICROELECTRON ICS
WIN SEM I M ICROELECTRON ICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
WIN SEM I M ICROELECTRON ICS
WIN SEM I M ICROELECTRON ICS
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet WS3413.PDF ] | |
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