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IC-Hersteller Infineon Technologies

Infineon Technologies ICE2QS03G | Demoboard ANPS0045

Converter design using the quasi-resonant PWM controller ICE2QS03G


Eingangsspannung85-265 V
Ausgang 1265 V / 0.82 A
IC-Revision45W Rev1.0


ICE2QS03G is a second generation quasi-resonant PWM controller optimized for off-line power supplyapplications such as LCD TV, and notebook adapter. The digital frequency reduction with decreasing loadenables a quasi-resonant operation till very low load. As a result, the system average efficiency issignificantly improved compared to conventional solutions. The active burst mode operation enables ultra-lowpower consumption at standby mode operation and low output voltage ripple. The numerous protectionfunctions give a full protection of the power supply system in failure situation. All of these make theICE2QS03G an outstanding controller for quasi-resonant flyback converter in the market.In addition, numerous protection functions have been implemented in the IC to protect the system andcustomize the IC for the chosen applications. All of these make the ICE2QS03G an outstanding product forreal quasi-resonant flyback converter in the market.


Load dependent digital frequency reduction

  • Active burst mode for light load operation
  • Built-in high voltage startup cell
  • Built-in digital soft-start
  • Cycle-by-cycle peak current limitation with built-in leading edge blanking time
  • Foldback Point Correction with digitalized sensing and control circuits
  • VCC undervoltage and overvoltage protection with Autorestart mode
  • Over Load /open loop Protection with Autorestart mode
  • Built-in Over temperature protection with Autorestart mode
  • Adjustable output overvoltage protection with Latch mode
  • Short-winding protection with Latch mode
  • Maximum on time limitation
  • Maximum switching period limitation

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