20160322025543 2170

WS9226ProductDescription
High Precision PSR Constant Current LED Driver
Features
Description

Built-in650V Power MOSFET
The WS9226 is a high precision primary-side feedback

Constant current control without secondary sense and
and regulation controller for LED lighting, it operates in
feedback circuit.
constant current control mode and is designed to work in

No Auxiliary winding for sensing and supplying
inductor

Ultra low operating current to improve efficiency
especially suitable for flyback convertor under universal input.

Universal input voltage
The output power of system is recommended to less than

±5% LED current accuracy
24W.

LED short and open circuit protection

VCC under-voltage protection
adopting primary sense and feedback control technology, the

Over temperature protection
secondary sense and feedback circuit is eliminated. The loop

Available in DIP-8 package
compensation
current
discontinuous
conduction
mode
and
The WS9226integrates 650V power MOSFET. Since
maintaining
components
stability
are
overall
also
removed
operating
conditions.
while
The
operating current is very low, and it doesn’t need the auxiliary
Applications
winding for sensing the output current and supplying the chip.

LED bulb, spot light
The low component counts and small system size are

Other LED lighting
realized.
Since using the proprietary high accurate current sense
method, theWS9226 realizes ±5% accuracy of LED current
along with excellent line and load regulation.
The WS9226 offers rich protection functions including
LED
open/short
circuit
protection,
over-temperature
protection, VCC under voltage protection.
Typical Application
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WS9226ProductDescription
Pin Configuration and Marking Information
The WS9226 is available in DIP8 Package,the top marking is shown as below:
WS9226D8P
A:Product Code
X:Internal Code
BCY:Internal Code For QC
YMX:D/C
Pin Definition
Name
Pin No.
Description
GND
1
Ground
CS
2
NC
3
No connection, must be floated
VCC
4
Power supply
NC
5
No connection, must be floated
DRAIN
6,7,8
Internal high voltage MOSFET Drain
Current sense. This pin connects a current sense resistor to GND to detect the primary
current of transformer.
Internal Block Diagram
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WS9226ProductDescription
Ordering Information
Package
Marking
Part Number
8-Pin DIP-8, Pb-free
WS9226D8P
WS9226D8P
Recommended Operation Conditions
Part Number
Package
WS9226D8P
DIP8
Input voltage
Maximum output
power
175VAC-264VAC
≤36W
90VAC-264VAC
≤24W
Absolute Maximum Ratings
symbol
paramete
Range
unit
Icc_max
VCC pin maximum sink current
2.5
mA
Drain
Internal HV MOSFET drain voltage
-0.3~650
V
CS
Current sense pin input voltage
-0.3~7
V
TJ
Operating junction temperature
165
℃
TSTG
Storage temperature range
-55~165
℃
Note 1: Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
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WS9226ProductDescription
Electrical Characteristics (Unless otherwise specified, VCC=8V and TA =25 ℃)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
1mA
17.8
18.8
19.8
V
Supply Voltage Section
VCC_Clamp
VCC clamp voltage
UVLO_off
Turn-off threshold Voltage
14.3
15.3
16.3
V
UVLO_on
Turn on threshold Voltage
9
9.5
10
V
IST
VCC startup current
VCC= 13V
150
205
250
uA
IOP
VCC operating current
Fop=70KHz
140
uA
Current Sense Section
VCS_TH
TLEB
TDELAY
Threshold voltage for peak
390
current limit
Leading edge blanking
time for current sense
Switch off delay time
400
410
mV
350
ns
200
ns
Internal driver Section
Toff_max
Maximum Off Time
310
us
Toff_min
Minimum Off Time
3.5
us
Ton_max
Maximum On Time
100
us
7
us
Tons_OVP
Output OVP Threshold
Time
MOSFET Section
RDS_ON
BVDSS
IDSS
Static drain-source
1.55
on-resistance
Drain-source breakdown
1.8
650
voltage
Ω
V
Drain-source leakage
10
current
uA
Over Temperature Protection
TREG
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Thermal Regulation
150
Temperature
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WS9226ProductDescription
Application Information
Operating Switching Frequency
The WS9226 is a high performance power switch
The WS9226 is designed to work in discontinuous
specially designed for LED lighting, with patent constant
conduction mode and no external loop compensation
current control technology. The WS9226integrates a 650V
component is required while maintaining stability. The
power MOSFET. The accurate LED current can be realized
maximum duty cycle is limited to 42%. The maximum
without opto-coupler, TL431 feedback circuit and auxiliary
switching frequency at normal operation is suggested to set
winding while minimizing the external component count,
around 65KHz~70KHz. If the maximum frequency is set too
lowering the total bill of material cost.
high, it will affect the number of maximum series LED lamps.
If set too low, the LED open circuit voltage will be too high.
Start Up
The maximum and minimum switching frequency is
The start-up current inWS9226 is designed to as low as
limited in WS9226 to ensure the stability of system.
205uA. The VCC capacitor will be charged through the
The switching frequency can be set by the formula:
start-up resistor when the system is powered on. Once the
f 
VCC voltage reaches the start-up threshold, the WS9226
will start to switch. TheWS9226 integrates a 19V zener for
VCC clamping. Due to the ultra-low operating current, the
Np 2  VLED
8  Ns 2  Lp  I LED
Where, LP is the primary winding inductance of
auxiliary winding is not needed to supply the IC.
transformer.
Constant Current Control
Protection Function
Cycle-by-Cycle current sense is adopted in WS9226,
The WS9226has integrated rich protection functions,
the CS is connected to the current sense comparator, and
LED open/short protection, CS resistor short circuit
the voltage on CS will be compared with the internal 400mV
protection, VCC under voltage protection, over temperature
reference voltage, the MOSFET will be switched off when
protection, and so on. When the LED is open circuit, it will
the voltage on CS reaches the threshold. The output of the
trigger over-voltage protection logic and latch, the system
comparator includes a 350ns leading edge blanking time.
stops switching immediately.
The primary peak current is given by:
I P_PK 
When the LED short circuit is detected, the system
works at low frequency (Fop=3KHz), so the power
400
( mA)
RCS
consumption is low. After the system enters into fault latch
condition, the VCC voltage will fall until it reaches UVLO
The current in LED can be calculatedby the equation:
I OUT 
threshold. Then the system will re-start again. If the fault
condition is removed, the system will recover to normal
I P_PK
N
 P
4
NS
operation.
PCB Layouts
Where,
NP: primary winding turns of transformer
The following rules should be followed in WS9226 PCB
NS: secondary winding turns of transformer
layout
IP_PK: peak current in MOSFET
Bypass Capacitor
The bypass capacitor on VCC should be as close as
Power MOSFET
possible to the VCC pin and GND pin.
The WS9226integrates a 650V power N-MOSFET. It
Ground Path
can minimize the external component count and reduce the
BOM cost and PCB size.
The power ground path for current sense should be
short, and the power ground path should be separated from
The WS9226 uses DIP-8 package. The recommended
system output power is below 24W in universal input
small signal ground path before the negative of the bulk
capacitor.
(90Vac~265Vac) application.
The Area of Power Loop
The area of main current loop should be as small as
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WS9226ProductDescription
possible to reduce EMI radiation, such as the primary
current loop, the snubber circuit and the secondary rectifying
loop.
NC Pin
The NC pin must be left floating to satisfy the
requirement of creepage distance.
Drain pin
To increase the copper area of drain for thermal
consideration.
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WS9226ProductDescription
Package Information
DIP8Package Outline Dimensions
D2
θ1
C1
C
C4
θ2
C2
C3
θ3
A2
A5
A1
D1
A3
D
A4
B
A
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Dimensions in Millimeters
Symbol
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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Dimensions in Inches
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7.62TYP
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WS9226ProductDescription
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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