New single-stage flyback controller for battery charging applications

Infineon Technologies AG has extended its offering of AC-DC controller ICs by releasing the ICC80QSG single-stage PWM controller for flyback topologies. The IC is developed for battery charger applications providing scalable power designs of up to 130W – when optimised using CoolMOS P7 SJ MOSFETs. It is also ideal for adapter, printer, PC, TV, set-top box, monitor, and audio amplifier applications.

The IC provides a QRMn. Its QRM operation comes with CCM prevention and valley switching DCM in mid to light load. By pairing the device with CoolMOS P7 MOSFET devices, high efficiency and low EMI can be achieved to allow savings on the overall BOM: fewer heatsinks and coils may be required in flyback designs. Further, the integrated burst mode function for very light loads enables designs with very low power consumption throughout standby mode. Also, it provides a decreased gate driver output voltage during burst mode, making it excellent for very low standby needs under light load or no-load conditions with a remarkable standby performance across the complete operating range.

The device implements an SSR method, which is excellent for current control through battery charging. For higher design flexibility, it comprises adjustable on-time mapping at the valley changing position for the required maximum operating switching frequency, and adjustable maximum on-time that limits input power and current, providing safe operation under low line conditions. The IC offers an externally configurable hysteresis of brown-in and brown-out to protect the primary MOSFET by providing it does not get overheated even with fewer heatsinks through input undervoltage with tight brown-in/brown-out hysteresis. Together with a comprehensive set of protection features, the IC helps supply easy, safe and robust AC/DC battery charger designs for many applications.