20160322030245 5822

WS3414H ProductDescription
Non-isolated Buck APFC Offline LED Driver
Features
Description

Internal 650V Power MOSFET

Active PFC for High Power Factor and Low THD

Critical Conduction Mode Operation
driver with active PFC, specially designed for universal input

System Efficiency up to 95%
offline constant current LED lighting. The driver with on-chip

Without auxiliary winding
PFC circuit achieves high power factor and low THD.

Excellent Line and Load Regulation
Operating in critical conduction mode, the power MOSFET

±3% LED Output Current Accuracy
switching loss is reduced and the inductor is fully utilized.

Thermal Regulation Function

LED Short/Open Protection
few external components, the LED output current can be

Current Sensing Resistor Open Protection
precisely controlled.

Auto Fault Recovery

Available in DIP7 Package
The WS3414H is a high precision non-isolated buck
The WS3414H integrates a 650V power MOSFET. With
The WS3414H offers rich protection functions to improve
the system reliability, including LED open circuit protection,
LED short circuit protection, CS resistor open circuit
protection and cycle by cycle current limit. All the protection
Applications
functions are auto-recovery. The system reliability is further

E27 LED Bulb, Spot Light
improved by the thermal regulation function. The output

PAR30, PAR38 Lamp
current is reduced when the driver is over temperature.

T8/T10 LED String

Other LED Lighting
The WS3414H has ultra low start up current and ultra low
operating current.
The WS3414H is available in DIP7 Package.
Typical Application
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WS3414H ProductDescription
Pin Configuration and Marking Information
The WS3414H is available in DIP7 Package,the top marking is shown as below:
WS3414HD7P
A:Product Code
X:Internal Code
BCY:Internal Code For QC
YMX:D/C
Pin Definition
Name
Pin No.
Description
COMP
1
GND
2
Ground.
VCC
3
Power Supply Pin. Connect a bypass capacitor from this pin to GND.
FB
4
D
5/6
Internal HV Power MOSFET Drain.
CS
7
Current Sense Pin. Connect a resistor to GND to sense the inductor current.
Loop Compensation Node. This pin connects a capacitor to GND for stabilization of the
control loop, achieving accurate LED current, high Power Factor and low THD.
Feedback Voltage Input Pin. This pin detects the inductor demagnetization signal and the
output voltage.
Internal Block Diagram
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WS3414H ProductDescription
Ordering Information
Package
7-Pin DIP-7,
Pb-free
Marking
Part Number
WS3414HD7P
WS3414HD7P
Recommended Operation Conditions
Part Number
Package
WS3414HD7P
DIP7
Input voltage
Maximum output
power
175VAC-264VAC
120V/280mA
90VAC-264VAC
80V/280mA
Absolute Maximum Ratings
symbol
paramete
Range
unit
VCC
Vcc pin voltage
-0.3~8
V
VD
Internal HV MOSFET Drain to Source voltage
-0.3~650
V
VCS
Current sense pin input voltage
-0.3~7
V
VFB
Feedback pin input voltage
-0.3~7
V
VCOMP
Compensation pin voltage
-0.3~7
V
PDMAX
Power dissipation
0.9
W
TJ
Operating junction temperature
165
℃
TSTG
Storage temperature range
-55~165
℃
Note : Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
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WS3414H ProductDescription
Electrical Characteristics (Unless otherwise specified, VCC=8V and TA =25 ℃)
Symbol
Parameter
Conditions
Min
Typ
Max
7.5
8.0
8.5
Units
Supply Voltage Section
Vcc_clamp
VCC Clamp Voltage
Icc_clamp
VCC Clamp Current
VCC_ST
VCC Turn On Threshold
VCC Rising
Vuvlo_HYS
VCC Turn Off hysteresis
VCC Falling
1.32
Ist
VCC Startup Current
VCC<VCC_ST-0.5V
70
Iop
VCC Operating Current
5
7.07
V
mA
7.57
8.07
V
V
100
uA
400
uA
1
V
350
ns
200
ns
Current Sense Section
Over current
Vocp
TLEB
Protectionthreshold
Leading Edge Blanking Time
for Current Sense
Td
Switch off Delay Time
Compensation Section
VREF
Internal Reference Voltage
194
200
206
mV
VCL
COMP Low Clamp Voltage
1.5
V
VCH
COMP High Clamp Voltage
4
V
Internal driver
TOFF_MIN
Minimum Off Time
3
us
TON_MAX
Maximum On Time
20
us
1.6
V
0.2
V
Feedback Section
VFB
FB Over Voltage Protection
Threshold
FB Falling Edge
VZCD
Threshold Voltage
Power MOSFET
RDSON
VDS
Static Drain-source
2
On-resistance
Drain-Source Breakdown
2.5
650
Voltage
Ω
V
Thermal Regulation Section
TREG
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Thermal Regulation
150
Temperature
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WS3414H ProductDescription
Application Information
RFBL
1.6V

RFBL  RFBH VOVP
The WS3414H is a high precision Active PFC driver
integrating 650V power MOSFET, specially designed for
non-isolated buck offline constant current LED lighting.
Where,
Operating in critical conduction mode, the driver achieves
RFBL: The lower resistor of the feedback network
high power factor, low THD and high efficiency.
RFBH: The upper resistor of the feedback network
VOVP: Output over voltage setting point
Start Up
The minimum VOVP should be set about 1.3Vo.It is
After system powered up, the VCC pin capacitor is
charged up by the start up resistor. When the VCC pin voltage
recommended that the FB lower
resistor is set to
3.3KΩ—5.1KΩparalleled with a 22pF ceramic capacitor.
reaches the turn on threshold, the internal circuits start
working. The COMP pin voltage is pulled up to 1.5V quickly,
then the WS3414Hstarts switching. The system works at 10k
Hz frequency at the beginning, the COMP voltage rises up
Protection Functions
The WS3414H offers rich protection functions to improve
the system reliability.
gradually, and the inductor peak current also rises up. The
When the LED is open circuit, the output voltage will
LED current hence achieves a soft start without overshoot.
gradually rise up. The output voltage is sensed by the FB pin
After the output voltage is built up, the VCC power is supplied
when power MOSFET is turned off. When FB voltage reaches
by the output voltage through a diode.
the OVP threshold, it will trigger fault logic and the system
The maximum value of the startup current is 100uA. For
the application of 85VAC —264VAC, the startup resistor can
be calculated by the equation:
Rst 
Vin _ min
I st _ max
stops switching.
When the LED is shorted circuit, the system will work
under 10k Hz switching frequency. Meanwhile, the output
voltage is low and the VCC pin cannot be charged up by the
85V

 850 KΩ
100uA
output voltage, so the VCC pin voltage will gradually
decrease and finally reaches the UVLO threshold.
After the system enters into fault condition, the VCC
voltage will decrease until it reaches UVLO threshold. Then
Constant Current Control
The WS3414H utilizes floating ground structure. The
inductor current is sensed during the whole switching cycle,
thus it achieves high precision output current control and also
the system will re-start again. If the fault condition is removed,
the system will resume normal operation.
When the output is short circuit or the inductor is
saturated, the CS peak voltage will be relatively high. When
excellent line and load regulation.
CS voltage reaches the internal limitation (1V), the power
The current in LED can be calculated by the equation:
MOSFET will be turned off instantaneously. This cycle by
V
200mV
I O  CS 
RCS
Rcs
cycle current limitation can help protecting the power
MOSFET, the inductor and the output diode.
Rcs is the current sensing resistor.
Thermal Regulation
The WS3414H integrates thermal regulation function.
Feedback Network
When the system is over temperature, the output current is
The WS3414H senses the output current zero crossing
information through the feedback network, the FB falling
threshold voltage is set to 0.2V with 0.15V hysteresis. The FB
pin is also used to detect output OVP, the threshold voltage is
gradually reduced; the output power and thermal dissipation
are also reduced. The system temperature is regulated and
the system reliability is improved. The thermal regulation
temperature is set to 150℃ internally.
1.6V. The ratio of FB upper resistor to lower resistor can be
set as:
PCB Layouts
The following guidelines should be followed in WS3414H
PCB layout:
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WS3414H ProductDescription
Bypass Capacitor
FB Pin
The bypass capacitor on VCC pin should be as close as
possible to the VCC and GND pins.
The feedback resistor divider should be as close as
possible to the FB pin, and the trace must keeps away from
Ground Path
dynamic node of the inductor (DRAIN pin trace、the positive
The power ground path for current sense resistor should
pin and the negative pin of Vo trace), otherwise the FB pin
be short and wide, and it should be as close as possible to the
OVP function might have risk to be mis-triggered by the
IC ground (pin 2), otherwise the LED output current accuracy
system noise.
maybe affected. The IC signal ground for COMP and FB
DRAIN Pin
components should be connected to the IC GND pin with
To increase the copper area of DRAIN pin for better
short traces and should be away from the power ground path.
thermal dissipation. However, too large copper area may
The Area of Power Loop
compromise EMI performance.
The area of main current loop should be as small as
possible to reduce EMI radiation.
The material of PCB
Avoid choosing the material that is easy to absorb the
moisture, just like paper copper-clad laminates.
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WS3414H ProductDescription
Package Information
DIP7Package Outline Dimensions
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Dimensions in Millimeters
Symbol
Dimensions in Inches
Min
Max
Min
Max
A
9.00
9.50
0.354
0.374
B
6.10
6.60
0.240
0.260
C
3.0
3.4
0.118
0.134
A1
1.474
1.574
0.058
0.062
A2
0.41
0.53
0.016
0.021
A3
2.44
2.64
0.096
0.104
A4
0.51TYP
0.02TYP
A5
0.99TYP
0.04TYP
C1
6.6
C2
7.30
0.260
0.50TYP
0.287
0.02TYP
C3
3.00
3.40
0.118
0.134
C4
1.47
1.65
0.058
0.065
D
7.62
9.3
0.300
0.366
D1
0.24
0.32
0.009
0.013
D2
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WS3414H ProductDescription
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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