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.

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