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WIS2269N8 Datasheet(PDF) 1 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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WIS2269N8 Datasheet(HTML) 1 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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1 / 10 page  WIS2269N8 WIS2269N8 WIS2269N8 WIS2269N8 Copyright@Winsemi Microelectronics Co., Ltd., All right reserved. Current Current Current Current Mode Mode Mode Mode PWM PWM PWM PWM Controller Controller Controller Controller 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 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. WIS2269 WIS2269 WIS2269 WIS2269 TL431 Rev. A Mar.2010 P02-1 |
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