20160322025226 1379

WS3240 ProductDescription
High Precision PSR LED Constant Current Driver
Features
Description

Built-in 650V UHV Power MOS

LED Constant Current: ±5%

Fixed Primary Peak Current: 185mA
constant current LED driver, suitable for flyback isolated

Without the Secondary winding
LED in sub 4W power range at universal AC input. It

Start up time less than 100ms
operates in discontinuous current mode.

High precision constant current regulation due to
WS3240 is a high precision primary side feedback
WS3240 integrates 650V power MOS. It operates in
patented CC control
primary side sensing and regulation, without a secondary

Built-in line compensation
feedback circuit, also need not the auxiliary transformer

Ultra low operation current
winding detection and power supply, only need few

Maximum power 4W
peripheral components can realize constant current,

LED open/short protection
greatly saves the cost and size of the system.

Floating pin protection

Excellent EMI performance with PFM control
universal AC input with the high voltage start technology,

Cycle-by-cycle current limit
realizing instant bright of the LED lamp.

Built-in leading Edge Blanking

VDD Under Voltage Lockout(UVLO)
with high precision current sampling circuit and line

Built-in over temperature protection
compensation. With patented constant current controlling
The start time of WS3240 is less than 100ms at
The
current
precision is
less
than
± 5%
mode, excellent linear regulation is achieved.
WS3240
Applications

provides
a
variety
of
comprehensive
protection mode, including: cycle by cycle current limit
LED lighting
protection(OCP), LED open/short circuit protection, under
voltage
protection
and
clamping,
over
temperature
protection, pin floating protection etc..
WS3240 is offered in TO-92 package.
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[email protected] Microelectronics Co., Ltd., All right reserved.
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WS3240 ProductDescription
Typical Application
Pin Configuration and Marking Information
WS3240 is offered in TO-92 package, as bellows:
WS3240NP
A:Product Code
X:Internal Code
BCY:Internal Code For QC
YMX:D/C
Pin Definition
Pin Name
Pin No.
Pin Type
Function Description
Drain
1
Drain
The drain terminal of Power MOSFET
GND
2
Ground
Ground.
VDD
3
Power
Power Supply.
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WS3240 ProductDescription
Internal Block Diagram
Ordering Information
Package
Marking
Part Number
3-Pin TO-92, Pb-free
WS3240NP
WS3240NP
Recommended Operation Conditions
Part Number
Package
WS3240NP
TO-92
Input voltage
Maximum output
power
175VAC-264VAC
4
W
90VAC-264VAC
3
W
Absolute Maximum Ratings
symbol
paramete
limites
unit
VDD
Power Supply
7
V
Ivdd_max
VDD Clamping current
10
mA
Drain
Drain of internal power MOS
-0.3~650
V
Tj
Maximun junction temperature
150
℃
Tjo
Operating temperature range
-40~150
℃
TSTG
Minimun/Maximum storage temperature
-55~150
℃
Note : Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
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WS3240 ProductDescription
Electrical Characteristics (Unless otherwise specified, VCC=8V and TA =25 ℃)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Supply Voltage Section
VDD_C
LAMP
VDD_re
g
UVLO_
off
VDD Clamping Voltage
10mA
6.3
VDD Power Supply
5.8
VDD Under Voltage Lockout
5.3
I_VDD
Quiet Current
VDD=6.1V
V
6.1
V
V
150
250
uA
185
194
mA
Current Sense Section
Ipp
Primary Peak Current
TLEB
Lead Edge Blanking
500
ns
Shutdown Delay
100
ns
Maximum Duty Cycle
50
%
255
us
3.6
us
5
us
TDELA
Y
D_max
176
Feedback Input Section
Toff_m
Maximum Demagnetization
ax
time
Toff_mi
Minimum Demagnetization
n
time
Tdem_
Open loop detection reference
OVP
Demagnetization time
Tcc/Tde
Cycle time/demagnetization
m
time
2
@constant current
Power MOSFET
Rds_on
Power On Resistor
BVdss
Breakdown Voltage
Idss
Idrain=50mA
30
Ω
650
V
Leakage Current of Power
10
MOS
uA
Over Temperature Protection
T_f
T_hys
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Over temperature protection
threshold
Over temperature protection
hysteresis
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160
℃
30
℃
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WS3240 ProductDescription
Application Information
current of primary side constant, also remains the ratio of
WS3240 is a constant current driver for LED lighting,
the demagnetization time and the cycle time, which can
adopted advanced constant current control method.It
realize constant output current, but also independent with
integrates 650V power switch. Only need a few peripheral
the line input voltage and transformer inductance. The ratio
components
of the demagnetization time and the cycle time is 0.5:
can
achieve
excellent
constant
current
characteristic. With the primary side feedback technology,
Tdem
 0.5
Ts
WS3240 do not need optocoupler and TL431, also need not
the auxiliary winding for power supply and detection. Thus
achieve the low system cost.
Single Chip Built-in 650V High Voltage Power
Supply, Start time less than 100ms
Low operation current
Fig.1 shows the internal high voltage power supply
The operating current of WS3240 is very low. The
typical value is 150uA. The low operating current improves
the efficiency of the system, while reducing the VDD
module. When the system access AC power, VDD capacitor
is charged by the internal 650V high voltage MOS. It will not
reset and start working until the VDD voltage reaches 5.8V.
capacitor requirements.
The start time is less than 100ms, which means that the light
achieves instant bright. In normal operation, VDD is
Primary Feedback PSR Technology
Assume that the system works in DCM flyback mode,
supply auxiliary Winding.
the power transmission equations can be expressed
P

2
dynamically charged by Drain, which can save the power
2
 Lm  I pk  f s  Vo  I o
Where, P is the output power, Vo and Io is the system
output voltage and current, η is the system power
conversion efficiency, Ipk is the primary side peak current,
fixed 185mA.
In DCM mode, Demagnetization time Tdem can be
expressed as:
Vo
N
 Tdem  s  I pk
Lm
Np
Where, Np and Ns is the transformer primary and
secondary turns, respectively. Combination of the above two
formula, the average output current can be expressed as:
Io 

2
Io 
 I pk 

2
Np
Ns
 I pk 
WS3240 detects the demagnetization time through the
 f s  Tdem
Np
Ns

drainterminal waveform, which can save auxiliary winding.
Cycle by Cycle Current Protection and Lead
Tdem
Ts
Edge Blanking
Where Ts is the switch cycle. WS3240 adopts PFM
mode to realize constant current, making the peak inductor
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Demagnetization Detection
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Cycle-by-cycle current limiting is offered in WS3240. An
internal leading edge blanking circuit chops off the sense
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WS3240 ProductDescription
voltage spike on the current sense resistor at initial
Pin Floating Protection
MOSFET on state. The typical value of lead edge blanking is
500ns. The current limit comparator is disabled and thus
In WS3240, pin floating phenomenon will not cause
damage to the system.
cannot turn off the internal MOSFET.
Automatic restart protection
PFM Control improves the EMI performance
In WS3240, protection is locked when a certain
WS3240 uses the PFM control method, which can
protection is triggered, while the switching stops, intering
improve the system performance. Because PFM belongs to
restart delay mode. Here the VDD voltage is oscillates
frequency conversion control, built-in spread spectrum
between 5.3V and 5.8V, and entering into normal start mode
function.
after 64 cycles. After start up, it works and confirms whether
the protection is removed. If the protection is not removed,
Over Voltage Protection
the chip will enter into protection latch state, and repeat
WS3240 has a built-in over voltage protection circuit.
delay to restart, until the protection is released.
When the LED open, the output voltage increased cycle by
cycle, secondary demagnetization time induced. When the
Soft Driver of Internal Power MOSFET
secondary demagnetization time is less than 5us, the over
voltage protection will be triggered.
WS3240 has a built-in soft driver, improving the EMI
performance, realizing a balance between the efficiency, the
reliability and the EMI.
Minimum off time
WS3240 integrates the minimum off time control, the
typical value is 3.6us. It prevents the interference on the chip
operation voltage caused by the burrs of the switch off,
especially
when
larger
leakage
inductance
of
the
transformer and lower output voltage.
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WS3240 ProductDescription
Package Information
TO-92 Package Outline Dimensions
D
E
Q1
b
L
c
e
1
2
3
A
e
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Dimensions in Millimeters
Symbol
Dimensions in Inches
Min
Max
Min
Max
A
3.30
3.90
0.130
0.154
b
0.35
0.55
0.014
0.022
c
0.31
0.51
0.012
0.020
D
4.30
4.90
0.169
0.193
E
4.30
4.90
0.169
0.193
e
1.17
1.37
0.046
0.054
L
12.5
15.5
0.492
0.610
Q1
0.74
0.89
0.029
0.035
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WS3240 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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