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WIY2263 데이터시트 PDF




WINSEMI SEMICONDUCTOR에서 제조한 전자 부품 WIY2263은 전자 산업 및 응용 분야에서
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부품번호 WIY2263 기능
기능 Current Mode PWM Controller
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WIY2263 데이터시트, 핀배열, 회로
www.DataSheet.in
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




WIY2263 pdf, 반도체, 판매, 대치품
www.DataSheet.in
Input impedance
Over Current Detection and Control Delay
Over Current Threshold Voltage
at zero Duty Cycle
Oscillator Section
Frequency
Burst mode frequency
Frequency variation versus temp. Deviation
Frequency variation versus VDD
Operating RI Range
open Load Voltage
Zsense
TD_OC
VTH_OC
Fosc
Fosc_BM
Δf_temp
Δf_VDD
RI_range
V_RI_Open
GATE with 1nF to GND
FB3V
Oscillation
@RI=100K,CS=0,FB=3V
Oscillation
@RI=100K,CS=0,FB=1.1V
TEMP = -20 to 85
VDD = 12 to 25V
Gate Output Section
Output voltage Low level
Output voltage high level
Output clamp voltage
Rising time
Falling time
VOL
VOH
VClamp
tr
tf
VDD = 16V, Io = -20mA
VDD = 16V, Io = 20mA
VDD = 16V,
GATE with 1nF to GND
VDD = 16V,
GATE with 1nF to GND
Frequency Shuffling
Frequency Modulation range
/Base frequency
Shuffling Frequency
Δf_OSC
RI=100K
f_shuffling RI=100K
WIY2263
- 40 - kΩ
80 ns
0.70 0.75 0.80 V
60 65 70 KHz
- 22 - KHz
- 5 -%
- 5 -%
50 100 150 KΩ
- 2 -V
- - 0.8
10 -
-
- 18 -
- 200 -
V
V
V
s
- 70 - s
-3 -
3%
64 Hz
4/9
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WIY2263 전자부품, 판매, 대치품
www.DataSheet.in
WIY2263
OPERATION DESCRIPTION
The WIY2263 is a highly integrated PWM controller IC
optimized for offline flyback converter applications in sub 30W
power range. The extended burst mode control greatly
reduces the standby power consumption and helps the design
easily meet the international power conservation requirements.
Startup Current and Start up Control
Startup current of WIY2263 is designed to be very low so
that VDD could be charged up above UVLO threshold level
and device starts up quickly. A large value startup resistor can
therefore be used to minimize the power loss yet provides
reliable startup in application. For AC/DC adaptor with
universal input range design, a 2 MΩ, 1/8 W startup resistor
could be used together with a VDD capacitor to provide a fast
startup and low power dissipation solution.
Operating Current
The Operating current of WIY2263 is low at 1.4mA. Good
efficiency is achieved with WIY2263 low operating current
together with extended burst mode control features.
Frequency shuffling for EMI improvement
The frequency Shuffling/jittering (switching frequency
modulation) is implemented in WIY2263. The oscillation
frequency is modulated with a random source so that the tone
energy is spread out. The spread spectrum minimizes the
conduction band EMI and therefore reduces system design
challenge.
Extended Burst Mode Operation
At zero load or light load condition, majority of the power
dissipation in a switching mode power supply is from switching
loss on the MOSFET transistor, the core loss of the
transformer and the loss on the snubber circuit. The
magnitude of power loss is in proportion to the number of
switching events within a fixed period of time. Reducing
switching events leads to the reduction on the power loss and
thus conserves the energy. WIY2263 self adjusts the switching
mode according to the loading condition. At from no load to
light/medium load condition, the FB input drops below burst
mode threshold level. Device enters Burst Mode control. The
Gate drive output switches only when VDD voltage drops
below a preset level and FB input is active to output an on
state. Otherwise the gate drive remains at off state to
standby power consumption to the greatest extend. The
frequency control also eliminates the audio noise at any
loading conditions.
Oscillator Operation
A resistor connected between RI and GND sets the
constant current source to charge/discharge the internal cap
and thus the PWM oscillator frequency is determined. The
relationship between RI and switching frequency follows the
below equation within the specified RI in Kohm range at
nominal loading operational condition.
Fosc = 6500 (KHz)
RI (K)
Current Sensing and Leading Edge Blanking
Cycle-by-Cycle current limiting is offered in WIY2263
current mode PWM control. The switch current is detected
by a sense resistor into the sense pin. An internal leading
edge blanking circuit chops off the sense voltage spike at
initial MOSFET on state due to Snubber diode reverse
recovery so that the external RC filtering on sense input is no
longer required. The current limit comparator is disabled and
thus cannot turn off the external MOSFET during the
blanking period. PWM duty cycle is determined by the
current sense input voltage and the FB input voltage.
Internal Synchronized Slope Compensation
Built-in slope compensation circuit adds voltage ramp
onto the current sense input voltage for PWM generation.
This greatly improves the close loop stability at CCM and
prevents the sub-harmonic oscillation and thus reduces the
output ripple voltage.
Gate Drive
WIY2263 Gate is connected to an external MOSFET gate
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부품번호상세설명 및 기능제조사
WIY2263

Current Mode PWM Controller

WINSEMI SEMICONDUCTOR
WINSEMI SEMICONDUCTOR

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