ICE2QS03G Description

A quasi-resonant PWM controller designed for off-line switch power supply is called ICE2QS03G. A quasi-resonant functioning is possible down to very low loads thanks to the digital frequency reduction with decreasing load. In contrast to other traditional systems, the overall system efficiency is thereby markedly increased. Ultra-low power consumption in standby mode is made possible by the active burst mode's modest, regulated output voltage ripple. The product, which is based on BiCMOS technology, has a broad operating range of IC power supply (up to 25V) and uses less power. The many protection features provide complete protection of the power supply system in case of failure. All of these factors combine to make the ICE2QS03G an exceptional quasiresonant flyback converter controller.

ICE2QS03G Features

Quasi resonant operation till very low load

Active burst mode operation at light/no load for low standby input power (< 100mW)

Digital frequency reduction with decreasing load

Startup cell for VCC pre-charging with constant current

Built-in digital soft-start

Foldback correction and cycle-by-cycle peak current limitation

Auto restart mode for VCC Over-voltage protection, VCC Under-voltage protection and open loop/over-load protection

Latch-off mode for adjustable output over-voltage protection and short-winding protection

ICE2QS03G Applications

Active burst mode for low standby power

Quasi resonant operation

Digital frequency reduction for better overall system efficiency

Integrated 500V startup cell

Pb-free lead plating, halogen free mold compound, RoHS compliant