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PDF WS3130 Data sheet ( Hoja de datos )
| Número de pieza | WS3130 | |
| Descripción | High Performance LED Driver | |
| Fabricantes | Winsemi | |
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WS3130 Product Description
WS3130 High Performance LED Driver
Features
Single stage PFC
Primary side regulation without Secondary Feedback
Quasi Resonance (QR) mode with Confidential
Fly-back topology
Real-Current control to meet accurate output current
Very less components
Programmable input AV voltage compensation
Leading Edge Blanking on CS/FB pin
Protection Features
Building in hysteresis OTP
VDD over voltage protection
Cycle by cycle current limiting on CS pin
Secondary peak current protection on CS pin
Output short to GND protection
Output programmable over voltage protection
FB and CS pins default protection
Applications
LED lighting
Down light
Tube lamp
PAR lamp
Bulb
General Description
The WS3130 is a single-power stage, isolated and
primary side offline LED lighting regulator which achieves
high power factor.
The proprietary real-current control method can control
the LED current accurately from the primary side information.
It can significantly simplify the LED lighting system
design by eliminating the secondary side feedback
components and the opto-coupler.
The WS3130 integrates active power factor correction
and works in Quasi Resonance mode (QRM) in order to
reduce the MOSFET switching losses.
With a building in 700V start-up MOSFET, IC can
eliminate the power loss caused by start-up resistors to
provide a high efficiency solution for lighting applications.
The external programmable line voltage compensation
provides a more precise output current throughout the
universal AC input voltage range.
The leading edge blanking circuit on the CS/FB input
removes the signal glitch and results in reduced external
components and system cost. The multi-protection features of
WS3130
Greatly enhance the system reliability and safety.
Features VDD and output over voltage protection; output
short circuit protection cycle-by-cycle current limit and
secondary peak current protection on CS pin, VDD UVLO and
auto-restart and over-temperature protection. The driver
output voltage is clamped at 18V to protect the external
power MOSFET.
WS3130 is offered in SOP-8 packages.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
Copyright@Winsemi Microelectronics Co., Ltd., All right reserved.
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
1216
1 page  
WS3130 Product Description
Operation
The WS3130 is a primary side control offline LED
controller that incorporates all the features for performance
LED lighting. LED current can be method form the primary
side eliminate the unwanted harmonic noise injected onto the
AC line.
Startup
During start-up, the current can charge up the VDD hold
capacitor. the turn on and turn off threshold of WS3130 are
approximately 15V and 9V respectively. The 6V hysteresis
voltage is implemented to prevent shutdown from a voltage
dip during start-up.
Quasi Resonance mode (QRM)
During the external power MOSFET on time (TON), the
rectified input voltage is applied across the primary side
inductor (Lm) and the primary current increases linearly from
zero to the peak value (IPK).When the external power
MOSFET turns off, the energy stored in the inductor forces
the secondary side diode to be turn-on, and the current of the
inductor begins to decrease linearly from the peak value to
zero. When the current decreases to zero, the parasitic
resonant of induct and all the parasitic capacitance makes the
power MOSFET drain-source voltage decrease, this
decreasing is also reflected on the auxiliary winding. The zero
current detector in FB pin generates the turn on signal of the
external MOSFET when the FB voltage is lower than 0.2V
and ensures the MOSFET turn on at a valley voltage .As a
result, there are virtually no primary switch turn-on losses and
no secondary diode reverse-recover losses. It ensures high
efficiency and low EMI noise.
Active Power Factor Correction(APFC)
WS3130 is designed with quasi-resonance and constant
on time Ton to achieve high power factor under normal
operation.The on time of WS3130 vary with input AC voltage
VP Sint and load condition and its value is constant
basically because of very large loop compensaion
capacitance on CMP pin.According to following equations,
I L peak
Vp Sint
Lm
TonI Lavg
Vp Sint
2 Lm
To2n
fosc
The peak current I L peak and average current I Lavg
of transformer will be shaped as AC input sinusoid too
beacause Ton and fosc both are constant and then high
power factor can be achieved.
Real Current Regulator without Secondary
Feedback
The proprietary real current control method allows the
WS3130 to accurately control the secondary side LED current
from the primary side information.The output LED mean
current can be calculated approximately as:
I OUT
1
2
VREF
RCS
NP
NS
Where IOUT is the secondary output current of
LED, VREF is the inner reference voltage. Np is number of
turns of primary winding and Ns is number of turns of the
secondary winding.
Auto Starter
The WS3130 integrates an auto starter,the starter starts
timing when the MOSFET is turned on,if FB fails to send out
another turn on signal after 130 μ s,the starter will
automatically send out the turn on signal which can avoid the
IC unnecessary shut down by FB missing detecion.
Minimal Off Time
The WS3130 operates with variable switching
frequency. The frequency is changing with the input
instantaneous line voltage. To limit the maximum frequency
and get a good EMI performance, WS3130 employs an
internal minimum off time limiter—3.5µs, show as figure.
Leading-Edge Blanking for CS pin
In order to avoid the premature termination of the
switching pulse due to the parasitic capacitance discharging
at MOSFET turning on,an internal leading edge blanking(LEB)
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299
WINSEMI MICROELECTRONICS
WINSEMI MICROELECTRONICS
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet WS3130.PDF ] | |
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