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PDF WIY2263 Data sheet ( Hoja de datos )
| Número de pieza | WIY2263 | |
| Descripción | Current Mode PWM Controller | |
| Fabricantes | WINSEMI SEMICONDUCTOR | |
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FEATURES
■ Burst Mode function
■ Low startup current (4uA)
■ Low operating current (1.4mA)
■ Built-edge blanking
■ Built-in synchronized slope compensation
■ Current mode
■ External Programmable PWM Switching Frequency
■ By-cycle current limit protection (OCP)
■ VDD over-voltage clamping protection
■ Low voltage shut down function (UVLO)
■ Gate Drive Output Voltage Clamp (18V)
■ Frequency jitter feature
■ Constant output power limit
■ Overload protection (OLP)
■ Work does not produce audio noise
APPLICATIONS
Offline AC/DC flyback converter for
■ Power Adaptor
■ Open-frame SMPS
■ Battery Charger
■ Set-Top Box Power Supplies
TYPICAL APPLICATION
WIY2263
Current Mode PWM Controller
GERNERAL DESCRIPTION
WIY2263 is a highly integrated current mode PWM
control IC optimized for high performance, low standby
power and cost effective offline flyback converter
applications in sub 30W range.
PWM switching frequency at normal operation is
externally programmable and trimmed to tight range. At
no load or light load condition, the IC operates in
extended ‘burst mode’ to minimize switching loss. Lower
standby power and higher conversion efficiency is thus
achieved.
VDD low startup current and low operating current
contribute to a reliable power on startup design with
WIY2263. A large value resistor could thus be used in
the startup circuit to minimize the standby power. The
internal slope compensation improves system large
signal stability and reduces the possible sub-harmonic
oscillation at high PWM duty cycle output. Leading-edge
blanking on current sense(CS) input removes the signal
glitch due to snubber circuit diode reverse recovery and
thus greatly reduces the external component count and
system cost in the design.
WIY2263 offers complete protection coverage with
automatic self-recovery feature including Cycle-by-Cycle
current limiting (OCP), over load protection (OLP), VDD
over voltage clamp and under voltage lockout (UVLO).
The Gate-drive output is clamped to maximum 18V to
protect the power MOSFET. Excellent EMI performance
is achieved with Winsemi proprietary frequency shuffling
technique together with soft switching control at the
totem pole gate drive output.
WIY2263
TL431
Rev. A Mar.2010
Copyright@WinSemi Semiconductor Co.,Ltd.,All rights reserved.
P02-1
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet WIY2263.PDF ] | |
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| Número de pieza | Descripción | Fabricantes |
| WIY2263 | Current Mode PWM Controller | WINSEMI SEMICONDUCTOR |
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