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WINSEMI SEMICONDUCTOR

WIS2269N8 Datasheet Preview

WIS2269N8 Datasheet

Current Mode PWM Controller

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FEATURES
Burst Mode function
Low startup current (6.5uA)
Low operating current (2.3mA)
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
WIS2269N8
Current Mode PWM Controller
GERNERAL DESCRIPTION
WIS2269 is a highly integrated, high performance current
mode PWM controller chip. Apply to the power adapter and
other small and medium-power switch power supply.
In order to reduce standby power consumption to meet the
higher standards of environmental protection, the chip
provides a pulse mode (Burst Mode) function, very low starting
current and operating current. Pulse mode that is in the light
load or no load conditions, WIS2269 can linearly decrease the
switching frequency chip, thereby reducing switching loss; by
optimizing the design, WIS2269 has a very low starting current
and operating current, is not only beneficial to start the circuit
design, and the start circuit can be used in high-value startup
resistor, to reduce power consumption, improve power
conversion efficiency.
WIS2269 built-in synchronized slope compensation circuit,
to prevent the PWM controller when working in high-duty cycle
may have harmonic oscillation. WIS2269 side in the current
sample input pin edge blanking function built in, can effectively
remove the current feedback signal of the glitch. Help to
reduce the number of external components, reducing overall
system cost.
WIS2269 offers a variety of comprehensive resume
protection mode, including:-by-cycle current limit protection
(OCP), over-load protection (OLP), VDD over-voltage
clamping voltage and low voltage closed (UVLO). Which, in
order to better protect the external MOSFET power transistor,
the gate drive output voltage is clamped at 18V.
WIS2269 the totem pole gate drive output using a frequency
jitter control technology and soft-switching technology, can be
very good to improve EMI performance switching power
supply system. By optimizing the design, when the chip's
operating frequency less than 20KHz circumstances, the
audio energy can be reduced to a minimum. Therefore, the
audio can get greatly improved noise performance.
WIS2269-chip can be used as RCC-mode power supply
linear power supply or the best alternative to enhance the
overall performance of switching power supply system, and
effectively reduce the system cost.
Rev. A Mar.2010
WIS2269
TL431
Copyright@WinSemi Semiconductor Co.,Ltd.,All rights reserved.
P02-1




WINSEMI SEMICONDUCTOR

WIS2269N8 Datasheet Preview

WIS2269N8 Datasheet

Current Mode PWM Controller

No Preview Available !

www.DataSheet.in
GENERAL INFORMATION
Pin Configuration
WIS2269N8
TERMINAL ASSIGNMENTS
Pin Name Pin No. I/O
Description
GND
FB
VI
RI
RT
1 P Ground
Feedback input pin. The input level value and 6-pin to monitor the value of current is
2
I
indeed common set PWM duty cycle control signal. If the FB terminal of the input voltage
is greater than a set set threshold voltage, the internal protection circuit will automatically
turn off PWM output.
Through a high resistance of the resistor connected to the rectifier output, start the device
3 I into the working condition; while the voltage is sampled to generate line voltage
compensation.
4
I
Internal Oscillator frequency setting pin. A resistor connected between RI and GND sets
the PWM frequency.
5 I Temperature monitoring of input pins. By a NTC resistor connected to ground.
SENSE
6 I Current sense input pin. Connected to MOSFET current sensing resistor node.
VDD
GATE
7 P Chip DC power supply pin
8 O Totem-pole gate drive output for the power MOSFET.
BLOCK DIAGRAM
2/10
Steady, all for your advance


Part Number WIS2269N8
Description Current Mode PWM Controller
Maker WINSEMI SEMICONDUCTOR
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