20160322025157 7021

WS3130 Product Description
WS3130 High Performance LED Driver
Features
General Description

Single stage PFC

Primary side regulation without Secondary Feedback

Quasi Resonance (QR) mode with Confidential
primary side offline LED lighting regulator which achieves

Fly-back topology
high power factor.

Real-Current control to meet accurate output current

Very less components

Programmable input AV voltage compensation

Leading Edge Blanking on CS/FB pin
design

Protection Features
components and the opto-coupler.

Building in hysteresis OTP

VDD over voltage protection
and works in Quasi Resonance mode (QRM) in order to

Cycle by cycle current limiting on CS pin
reduce

Secondary peak current protection on CS pin

Output short to GND protection
eliminate the power loss caused by start-up resistors to

Output programmable over voltage protection
provide a high efficiency solution for lighting applications.

FB and CS pins default protection
The WS3130 is a single-power stage, isolated and
The proprietary real-current control method can control
the LED current accurately from the primary side information.
It can significantly simplify the LED lighting system
by
eliminating
the
secondary
side
feedback
The WS3130 integrates active power factor correction
the MOSFET switching losses.
With a building in 700V start-up MOSFET, IC can
The external programmable line voltage compensation
provides a more precise output
Applications
current
throughout
the
universal AC input voltage range.

LED lighting

Down light
removes the signal glitch and results in reduced external

Tube lamp
components and system cost. The multi-protection features of

PAR lamp
WS3130

Bulb
The leading edge blanking circuit on the CS/FB input
Greatly enhance the system reliability and safety.
Features VDD and output over voltage protection; output
short circuit protection cycle-by-cycle current limit and
secondary peak current protection on CS pin, VDD UVLO and
auto-restart and over-temperature protection. The driver
output voltage is clamped at 18V to protect the external
power MOSFET.
WS3130 is offered in SOP-8 packages.
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[email protected] Microelectronics Co., Ltd., All right reserved.
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WS3130 Product Description
Typical Application Circuit
Pin Definition and Device Marking
WS3130 is offered in SOP-8 packages,as shown below:
WS3130S8P
A:Product Code
X:Internal Code
BCY:Internal Code For QC
YMX:D/C
Pin Function Description
Pin Name
Pin No.
Pin Type
DIP8/SOP8
Function Description
Loop compensation
for constant current regulation.Output of the
COMP
1
I
FB
2
I/O
CS
3
I
Current sense pin, a resistor connects to sense the MOSFET current.
GND
4
POWER
DRV
5
O
Power Ground
Totem-pole output to drive the external power MOSFET Maximum
Voltage is internally clamped to 18V.
VDD
6
POWER
Power supply
NC
7/8
/
NO connect
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OTA.The RC work is placed between it and GND.
Detect output diode zero current to regulate output current.connect to a
resistor divider for sensing the reflected voltage from auxiliarywinding
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WS3130 Product Description
Block Diagram
Ordering Information
Package
8-Pin SOP8,
IC Marking Information
Purchasing Device Name
WS3130S8P
WS3130S8P
Pb-free
Recommended Operating Condition
Symbol
Parameter
Value
Unit
VCC
VCC Supply Voltage
10~28
V
TA
Operating temperature
-20~85
℃
Symbol
Parameter
Value
Unit
VCC
VCC pin input voltage
28
V
VFB
Feedback pin input voltage
-0.3~6
V
VCS
Current sense pin input voltage
-0.3~6
V
VCOMP
Compensation pin voltage
-0.3~6
V
VDRV
DRV pin input voltage
18
V
TJ
Operating junction temperature
150
℃
TSTG
Storage temperature range
-55~150
℃
Absolute Maximum Ratings
Note 1: 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.
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WS3130 Product Description
ESD Information
Symbol
Parameter
Value
Unit
VESD-HBM
Human body model on all pins
2
KV
VESD-MM
Machine model on all pins
200
V
Electrical Characteristics(Unless otherwise specified,TA=25℃,VCC=15V)
Symbol
Parameter
Test Conditions
IOP
Operating Current
Gate Open
VDDON
MIN
Typ.
MAX
Unit
VDD Pin
1
mA
Turn-on Threshold Voltage
16
V
VDDOFF
Turn-on Threshold Voltage
9
V
VDDOVP
VDD Over Voltage Protection
25
V
0.24
V
CMP Pin
VREF
Reference voltage for OTA input
ICMP_SINK
CMP maximal sink current
50
uA
ICMP_SOURCE
CMP maximal source current
10
uA
VCMP_MAX
CMP max. voltage
4.0
V
5.0
V
FB Pin
VFB_SINK
FB voltage when sink currentt
IFB_SINK=2mA
VFB_SOURCE
FB voltage when source currentt
IFB_Source=4mA
VFB_ZVD
FB zero voltage detect
0.2
V
VFB_OVP
FB voltage when output OVP
3.6
V
VFB_SCP
FB voltage when trigger SCP
1.0
V
1.0
V
-0.1
GND
+0.1
V
CS Pin
Cycle by Cycle current limited on
VCS1
CS
TBLACK
FB=0V
Leading-Edge Blanking Time
300
400
500
nS
Oscillator
FOSC_MAX
Maximal Frequency
130
KHZ
FOSC_MIN
Minimal Frequency
30
KHZ
GATE Drive Output (GATE Pin)
TR
Rise Time
CL=1nF
200
nS
TF
Fall Time
CL=1nF
100
nS
Over Temperature Protection
OTPH
Over Temperature Lockout
150
℃
OTPL
Over Temperature Resume
125
℃
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WS3130 Product Description
Operation
The WS3130 is a primary side control offline LED
I L peak 
Vp Sint
Lm
controller that incorporates all the features for performance
 Ton I Lavg 
Vp Sint
2  Lm
 Ton2  f osc
LED lighting. LED current can be method form the primary
The peak current
side eliminate the unwanted harmonic noise injected onto the
I L  peak
and average current
I L  avg
of transformer will be shaped as AC input sinusoid too
AC line.
Ton
beacause
Startup
f osc
and
both are constant and then high
power factor can be achieved.
During start-up, the current can charge up the VDD hold
capacitor. the turn on and turn off threshold of WS3130 are
approximately 15V and 9V respectively. The 6V hysteresis
Real Current
Feedback
Regulator
without
Secondary
The proprietary real current control method allows the
voltage is implemented to prevent shutdown from a voltage
WS3130 to accurately control the secondary side LED current
dip during start-up.
from the primary side information.The output LED mean
Quasi Resonance mode (QRM)
current can be calculated approximately as:
During the external power MOSFET on time (TON), the
I OUT 
rectified input voltage is applied across the primary side
inductor (Lm) and the primary current increases linearly from
zero to the peak value (IPK).When the external power
MOSFET turns off, the energy stored in the inductor forces
the secondary side diode to be turn-on, and the current of the
inductor begins to decrease linearly from the peak value to
zero. When the current decreases to zero, the parasitic
Where
V
LED, REF
MOSFET
drain-source
voltage
decrease,
this
decreasing is also reflected on the auxiliary winding. The zero
current detector in FB pin generates the turn on signal of the
external MOSFET when the FB voltage is lower than 0.2V
is the secondary output current of
is the inner reference voltage.
turns of primary winding and
N s is
Np
is number of
number of turns of the
secondary winding.
Auto Starter
resonant of induct and all the parasitic capacitance makes the
power
I OUT
1 VREF N P


2 RCS N S
The WS3130 integrates an auto starter,the starter starts
timing when the MOSFET is turned on,if FB fails to send out
another turn on signal after 130 μ s,the starter will
automatically send out the turn on signal which can avoid the
IC unnecessary shut down by FB missing detecion.
and ensures the MOSFET turn on at a valley voltage .As a
result, there are virtually no primary switch turn-on losses and
Minimal Off Time
no secondary diode reverse-recover losses. It ensures high
efficiency and low EMI noise.
The
frequency.
WS3130 operates
with variable switching
The frequency is changing
with
the input
instantaneous line voltage. To limit the maximum frequency
Active Power Factor Correction(APFC)
and get a good EMI performance, WS3130 employs an
WS3130 is designed with quasi-resonance and constant
on time
Ton
to achieve high power factor under normal
operation.The on time of WS3130 vary with input AC voltage
VP Sint
basically
internal minimum off time limiter—3.5µs, show as figure.
Leading-Edge Blanking for CS pin
and load condition and its value is constant
because
of
very
large
loop
compensaion
capacitance on CMP pin.According to following equations,
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In order to avoid the premature termination of the
switching pulse due to the parasitic capacitance discharging
at MOSFET turning on,an internal leading edge blanking(LEB)
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WS3130 Product Description
unit is employed between the CS Pin and the current
typical is 1.0V, the power MOSFET is turned off for the
comparator input.During the blanking time,the path,CS Pin to
remainder of that cycle.
the current comparator input,is blocked.Figure shows the
Leading-Edge Blanking For FB Pin
leading edge blanking.
As shown in Fig, when the power MOSFET is turned off,
a damping voltage spike will occur
at FB pin due to parasitic
capacitance of power MOSFET and leak inductor of
transformer. An internal leading edge blanking (LEB) was
introduced to filter this noise.
Output Short Circuit Protection
When the output short circuit happens, the positive
Output over Voltage Protection
Output
over
voltage
protection
plateau of auxiliary winding voltage is also near zero. The IC
can
prevent
the
components from damage in the over voltage condition.The
will shut down
and restart again once FB voltage
below 1.0V and lasts
falls
for about 20mS.
positive plateau of auxiliary winding voltage is proportional to
the output
voltage. The OVP uses the auxiliary winding
Thermal Shut Down
The
voltage instead of directly monitoring the output voltage.
thermal
shutdown
circuitry
senses
the
die
Once the FB pin voltage is higher than 3.6V, the OVP signal
temperature.The threshold is set at 150℃ typical with a 25℃
will be triggered and latched, the gate driver will be turned off
hysteresis.When the die temperature rises above this
and the IC work at quiescent mode, the VDD voltage dropped
threshold (150 ℃ ),the 840X turn off the power MOSFET by
below the UVLO which will make the IC shut down and the
DRV and remains turning off until the die temperature falls by
system restarts again.The output OVP setting point can be
25℃,at which point it is re-enabled.
calculated as:
VOUT _ OVP
VOUT_OVP
VDD over Voltage Protection
Ns
R  RFBL
 3.6 
 FBH
N AUX
RFBL
WS3130 provides an over voltage protection circuit for
VDD pin. The GATE output
……Output over voltge protection value
will shut down once the VDD
voltage exceeds 25V (typical value), the IC would restart until
N AUX ……the auxiliary winding turns
N s ……the secondary winding turns
VDD drops to 9.0V.
Fault protection
Current Limit
There is several default protections were integrated in
The current limit circuit senses the current of inductor by
CS pin. When this current exceeds the internal threshold,
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the WS3130 to prevent the IC from being damaged which
including FB pin open or short, CS pin open.
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WS3130 Product Description
SOP-8 Package Information
B2
A1
A2
0.5* 0.125± 0. 05
球形标记
D
D1
B
B1
A
C4
A3
R2
θ4
C
C1
C2
θ2
C3
R1
θ1
θ3
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Dimensions in Millimeters
Dimensions in Inches
Min
Max
Min
Max
A
4.70
5.10
0.185
0.201
B
3.70
4.10
0.146
0.161
C
1.30
1.50
0.051
0.059
A1
0.35
0.48
0.014
0.019
A2
1.27TYP
0.05TYP
A3
0.345TYP
0.014TYP
B1
5.80
B2
5.00TYP
C1
0.55
0.70
0.022
0.028
C2
0.55
0.70
0.022
0.028
C3
0.05
0.225
0.002
0.009
C4
0.203TYP
0.008TYP
D
1.05TYP
0.041TYP
D1
0.40
Symbol
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6.20
0.228
0.244
0.197TYP
0.80
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0.016
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0.031
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WS3130 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:Room 1002, East, Phase 2, HighTech Plaza,Tian-An Cyber Park,Chegongmiao, FuTian, Shenzhen, P.R.
China
Post Code : 518040
Tel : +86-755-8250 6288
FAX : +86-755-8250 6299
Web Site : www.winsemi.com
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