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PDF WS3240 Data sheet ( Hoja de datos )
| Número de pieza | WS3240 | |
| Descripción | High Precision PSR LED Constant Current Driver | |
| Fabricantes | WINSEMI | |
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WS3240 ProductDescription
High Precision PSR LED Constant Current Driver
Features
Built-in 650V UHV Power MOS
LED Constant Current: ±5%
Fixed Primary Peak Current: 185mA
Without the Secondary winding
Start up time less than 100ms
High precision constant current regulation due to
patented CC control
Built-in line compensation
Ultra low operation current
Maximum power 4W
LED open/short protection
Floating pin protection
Excellent EMI performance with PFM control
Cycle-by-cycle current limit
Built-in leading Edge Blanking
VDD Under Voltage Lockout（UVLO）
Built-in over temperature protection
Applications
LED lighting
Description
WS3240 is a high precision primary side feedback
constant current LED driver, suitable for flyback isolated
LED in sub 4W power range at universal AC input. It
operates in discontinuous current mode.
WS3240 integrates 650V power MOS. It operates in
primary side sensing and regulation, without a secondary
feedback circuit, also need not the auxiliary transformer
winding detection and power supply, only need few
peripheral components can realize constant current,
greatly saves the cost and size of the system.
The start time of WS3240 is less than 100ms at
universal AC input with the high voltage start technology,
realizing instant bright of the LED lamp.
The current precision is less than ± 5%
with high precision current sampling circuit and line
compensation. With patented constant current controlling
mode, excellent linear regulation is achieved.
WS3240 provides a variety of comprehensive
protection mode, including: cycle by cycle current limit
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.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
1201
1 page  
WS3240 ProductDescription
Application Information
WS3240 is a constant current driver for LED lighting,
adopted advanced constant current control method.It
integrates 650V power switch. Only need a few peripheral
components can achieve excellent constant current
characteristic. With the primary side feedback technology,
WS3240 do not need optocoupler and TL431, also need not
the auxiliary winding for power supply and detection. Thus
achieve the low system cost.
Low operation current
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
capacitor requirements.
Primary Feedback PSR Technology
Assume that the system works in DCM flyback mode,
the power transmission equations can be expressed
P
2
Lm
I pk 2
fs
Vo
Io
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
Lm
Tdem
Ns
Np
I pk
current of primary side constant, also remains the ratio of
the demagnetization time and the cycle time, which can
realize constant output current, but also independent with
the line input voltage and transformer inductance. The ratio
of the demagnetization time and the cycle time is 0.5:
Tdem
Ts
0.5
Single Chip Built-in 650V High Voltage Power
Supply, Start time less than 100ms
Fig.1 shows the internal high voltage power supply
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.
The start time is less than 100ms, which means that the light
achieves instant bright. In normal operation, VDD is
dynamically charged by Drain, which can save the power
supply auxiliary Winding.
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
I
pk
Np
Ns
fs
Tdem
Demagnetization Detection
WS3240 detects the demagnetization time through the
drainterminal waveform, which can save auxiliary winding.
Io
2
I pk
Np
Ns
Tdem
Ts
Where Ts is the switch cycle. WS3240 adopts PFM
mode to realize constant current, making the peak inductor
Cycle by Cycle Current Protection and Lead
Edge Blanking
Cycle-by-cycle current limiting is offered in WS3240. An
internal leading edge blanking circuit chops off the sense
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
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet WS3240.PDF ] | |
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