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What is WS9227?

This electronic component, produced by the manufacturer "Winsemi", performs the same function as "High Precision PSR Constant Current LED Driver".


WS9227 Datasheet PDF - Winsemi

Part Number WS9227
Description High Precision PSR Constant Current LED Driver
Manufacturers Winsemi 
Logo Winsemi Logo 


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WS9227ProductDescription
High Precision PSR Constant Current LED Driver
Features
Built-in 650V Power MOSFET
Constant current control without secondary sense and
feedback circuit.
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
Over temperature protection
Available in DIP-8 package and SOP-7 package
Applications
LED bulb, spot light
Other LED lighting
Description
The WS9227 is a high precision primary-side feedback
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.
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.
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
Copyright@WinsemiMicroelectronics Co.,Ltd., All right reserved
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
0114

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WS9227 equivalent
WS9227ProductDescription
Application Information
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.
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.
Operating Switching Frequency
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:
f
8
Np2 VLED
Ns2 Lp ILED
Where, LP is the primary winding inductance of
transformer.
Constant Current Control
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:
I P_PK
400 (mA)
RCS
The current in LED can be calculated by the equation:
I OUT
I P_PK
4
NP
NS
Protection Function
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.
Where,
NP: primary winding turns of transformer
NS: secondary winding turns of transformer
IP_PK: peak current in MOSFET
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 WS9227 uses DIP-8 package. The recommended
system output power is below 24W in universal input
(90Vac~265Vac) application.
PCB Layouts
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
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 Area of Power Loop
The area of main current loop should be as small as
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
5/8


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for WS9227 electronic component.


Information Total 8 Pages
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