WS9227D8P [ETC]
High Precision PSR Constant Current LED Driver;型号: | WS9227D8P |
厂家: | ETC |
描述: | High Precision PSR Constant Current LED Driver |
文件: | 总8页 (文件大小:544K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
WS9227ProductDescription
High Precision PSR Constant Current LED Driver
Features
Description
Built-in 650V Power MOSFET
The WS9227 is a high precision primary-side feedback
Constant current control without secondary sense and
feedback circuit.
and regulation controller for LED lighting, it operates in
constant current control mode and is designed to work in
inductor current discontinuous conduction mode and
especially suitable for fly back convertor under universal input.
The output power of system is recommended to less than
24W.
No Auxiliary winding for sensing and supplying
Ultra low operating current to improve efficiency
Universal input voltage
±5% LED current accuracy
LED short and open circuit protection
VCC under-voltage protection
The WS9227integrates 650V power MOSFET. Since
adopting primary sense and feedback control technology, the
secondary sense and feedback circuit is eliminated. The loop
compensation components are also removed while
maintaining stability overall operating conditions. The
operating current is very low, and it doesn’t need the auxiliary
winding for sensing the output current and supplying the chip.
The low component counts and small system size are
realized.
Over temperature protection
Available in DIP-8 package and SOP-7 package
Applications
LED bulb, spot light
Other LED lighting
Since using the proprietary high accurate current sense
method, theWS9227 realizes ±5% accuracy of LED current
along with excellent line and load regulation.
The WS9227 offers rich protection functions including
LED open/short circuit protection, over-temperature
protection, VCC under voltage protection.
Typical Application
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
Copyright@WinsemiMicroelectronics Co.,Ltd., All right reserved
0114
WS9227ProductDescription
Pin Configuration and Marking Information
The WS9227 is available in DIP-8 package, the top marking is shown as below:
WS9227D8P
A:Product Code
X:Internal Code
BCY:Internal Code For QC
YMX:D/C
Pin Definition
Name
Pin No.
Description
GND
1
Ground
Current sense. This pin connects a current sense resistor to GND to detect the primary
current of transformer.
CS
2
NC
VCC
3/5
4
No connection, must be floated
Power supply
DRAIN
6,7,8
Internal high voltage MOSFET Drain
Internal Block Diagram
Ordering Information
Package
Marking
Part Number
8-Pin DIP-8, Pb-free
WS9227D8P
WS9227D8P
WINSEMI
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemMi.cICoROmELECTRONICS
Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
2/8
WS9227ProductDescription
Recommended Operation Conditions
Maximum output
power
Part Number
Package
Input voltage
175VAC-264VAC
90VAC-264VAC
<50W
<36W
WS9227
DIP8
Absolute Maximum Ratings
symbol
Icc_max
Drain
CS
paramete
Range
unit
mA
V
VCC pin maximum sink current
Internal HV MOSFET drain voltage
Current sense pin input voltage
Operating junction temperature
Storage temperature range
2.5
-0.3~650
-0.3~7
165
V
TJ
℃
TSTG
-55~165
℃
Note 1: Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
3/8
WS9227ProductDescription
Electrical Characteristics (Unless otherwise specified, VCC=8V and TA =25 ℃)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Supply Voltage Section
VCC_Clamp
UVLO_off
UVLO_on
IST
VCC clamp voltage
1mA
17.8
14.3
9
18.8
15.3
9.5
19.8
16.3
10
V
V
Turn-off threshold Voltage
Turn on threshold Voltage
VCC start up current
V
VCC= 13V
150
205
140
250
uA
uA
IOP
VCC operating current
Fop=70KHz
Current Sense Section
Threshold voltage for peak
VCS_TH
390
400
410
mV
current limit
Leading edge blanking
time for current sense
TLEB
350
200
ns
ns
TDELAY
Switch off delay time
Internal driver Section
Toff_max
Toff_min
Ton_max
Maximum Off Time
310
3.5
us
us
us
Minimum Off Time
Maximum On Time
100
Output OVP Threshold
Time
Tons_OVP
7
us
MOSFET Section
Static drain-source
on-resistance
RDS_ON
0.96
1.2
10
Ω
V
Drain-source breakdown
voltage
BVDSS
650
Drain-source leakage
current
IDSS
uA
Over Temperature Protection
Thermal Regulation
Temperature
TREG
150
℃
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
4/8
WS9227ProductDescription
Application Information
Operating Switching Frequency
The WS9227 is a high performance power switch
specially designed for LED lighting, with patent constant
current control technology. The WS9227integrates a 650V
power MOSFET. The accurate LED current can be realized
without opto-coupler, TL431 feedback circuit and auxiliary
winding while minimizing the external component count,
lowering the total bill of material cost.
The WS9227 is designed to work in discontinuous
conduction mode and no external loop compensation
component is required while maintaining stability. The
maximum duty cycle is limited to 42%. The maximum
switching frequency at normal operation is suggested to set
around 65KHz~70KHz. If the maximum frequency is set too
high, it will affect the number of maximum series LED lamps.
If set too low, the LED open circuit voltage will be too high.
The maximum and minimum switching frequency is
limited in WS9227 to ensure the stability of system.
The switching frequency can be set by the formula:
Start Up
The start-up current inWS9227 is designed to as low as
205uA. The VCC capacitor will be charged through the
start-up resistor when the system is powered on. Once the
VCC voltage reaches the start-up threshold, the WS9227
will start to switch. TheWS9227 integrates a 19V zener for
VCC clamping. Due to the ultra-low operating current, the
auxiliary winding is not needed to supply the IC.
Np2 VLED
f
8 Ns2 Lp ILED
Where, LP is the primary winding inductance of
transformer.
Constant Current Control
Protection Function
Cycle-by-Cycle current sense is adopted in WS9227,
the CS is connected to the current sense comparator, and
the voltage on CS will be compared with the internal 400mV
reference voltage, the MOSFET will be switched off when
the voltage on CS reaches the threshold. The output of the
comparator includes a 350ns leading edge blanking time.
The primary peak current is given by:
The WS9227 has integrated rich protection functions,
LED open/short protection, CS resistor short circuit
protection, VCC under voltage protection, over temperature
protection, and so on. When the LED is open circuit, it will
trigger over-voltage protection logic and latch, the system
stops switching immediately.
When the LED short circuit is detected the system
works at low frequency (Fop=3KHz), so the power
consumption is low. After the system enters into fault latch
condition, the VCC voltage will fall until it reaches UVLO
threshold. Then the system will re-start again. If the fault
condition is removed, the system will recover to normal
operation.
400
IP_PK
(mA)
RCS
The current in LED can be calculated by the equation:
IP_PK
NP
NS
IOUT
4
Where,
PCB Layouts
NP: primary winding turns of transformer
NS: secondary winding turns of transformer
IP_PK: peak current in MOSFET
The following rules should be followed in WS9227 PCB
layout.
Bypass Capacitor
The bypass capacitor on VCC should be as close as
possible to the VCC pin and GND pin.
Ground Path
Power MOSFET
The WS9227integrates a 650V power N-MOSFET. It
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
small signal ground path before the negative of the bulk
capacitor.
The WS9227 uses DIP-8 package. The recommended
system output power is below 24W in universal input
(90Vac~265Vac) application.
The Area of Power Loop
The area of main current loop should be as small as
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
5/8
WS9227ProductDescription
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.
WINSEMI
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemMi.cICoROmELECTRONICS
Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
6/8
WS9227ProductDescription
Package Information
DIP8Package Outline Dimensions
D2
θ2
1
θ
3
θ
D1
A2
A
D
A3
A4
A5
A1
Winsemi
Dimensions in Millimeters
Dimensions in Inches
Symbol
Min
9.00
6.10
3.0
Max
9.50
6.60
3.4
Min
Max
A
0.354
0.240
0.118
0.058
0.016
0.096
0.374
0.260
0.134
0.062
0.021
0.104
B
C
A1
A2
A3
A4
A5
C1
C2
C3
C4
D
1.474
0.41
2.44
1.574
0.53
2.64
0.51TYP
0.99TYP
0.02TYP
0.04TYP
6.6
7.30
0.260
0.287
0.50TYP
0.02TYP
3.00
1.47
7.62
0.24
3.40
1.65
9.3
0.118
0.058
0.300
0.009
0.134
0.065
0.366
0.013
D1
D2
0.32
7.62TYP
0.3TYP
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
7/8
WS9227ProductDescription
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
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
8/8
相关型号:
©2020 ICPDF网 联系我们和版权申明