Single stage pulse width modulation (PWM) controller suitable for flyback topology

     Battery-powered appliances are one of the fastest growing market segments in the industry, and such applications require energy efficient, robust and cost-effective battery charging solutions. To meet this demand, Infineon Technologies has introduced the ICC80QSG single-stage pulse Width modulation (PWM) controller for flyback topologies, further expanding Infineon's AC-DC controller IC product lineup. Specifically tailored for battery charging applications, the IC is designed in conjunction with CoolMOS™ P7 Super Junction (SJ) MosFETs for scalable power outputs up to 130 W. This product is also suitable for adapters, printers, personal computers, televisions, monitors, set-top boxes, audio amplifiers and other applications.

     The ICC80QSG battery charging IC supports quasi-resonant mode multi-trough switch (QRMn). In addition to the quasi-resonant mode (QRM), it also prevents entry into continuous on-off mode (CCM) and interrupts on-off mode (DCM) to achieve valley switching under moderate and light loads. By combining the ICC80QSG with CoolMOS™ P7 MOSFET devices, the product improves energy efficiency and reduces electromagnetic interference (EMI).

     The flyback design also saves BOM costs because it requires fewer fins and coils. In addition, integration for burst mode under light load conditions helps achieve extremely low power consumption in standby mode. The ICC80QSG can reduce the output voltage of the grid driver chip in burst mode, and can meet the requirements of extremely low standby loss under light load or no load conditions, resulting in excellent standby performance across the operating range.

     The ICC80QSG uses secondary side adjustment (SSR) control, which is an ideal solution for current-controlled battery charging. For greater design flexibility, it provides an adjustable turn-on time comparison table corresponding to the bottom switch position at a given maximum operating frequency, and an adjustable maximum turn-on time for limiting the input power and current to allow safe operation under low voltage line conditions.

     The IC provides protection for primary MOSFETs with externally adjustable hysteretic backvoltage protection and undervoltage protection. So that it will not overheat even if less radiator is used under input undervoltage conditions. With a full range of protection features, the ICC80QSG enables a simple, safe and powerful AC-DC battery charger design for many applications.