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New Single-Stage Flyback Controller IC with Quasi-Resonant Mode Designed for Battery Charging Applications

 Single-Stage Flyback Controller IC
Single-Stage Flyback Controller IC

Infineon Technologies AG has extended its offering of AC-DC controller ICs by introducing the new ICC80QSG single-stage PWM controller for flyback topologies. This new battery charging IC offers a quasi-resonant mode, switching in valley n (QRMn) and the QRM operation of this IC comes with CCM prevention and valley switching (DCM). This IC is tailored for battery charger applications offering scalable power designs of up to 130 W – when optimized using CoolMOS™ P7 Superjunction (SJ) MOSFETs. Moreover, it is also suitable for adapters, printers, PC, TV, monitor, set-top box, and audio amplifier applications.


This IC features a reduced gate driver output voltage during burst mode, making it ideally suited for very low standby requirements under light load or no load conditions with a remarkable standby performance over the whole operating range. By pairing this IC with CoolMOS™ P7 MOSFET devices, high efficiency and low electromagnetic interference (EMI) can be achieved to enable savings on the overall BOM. It has an externally configurable hysteresis of brown-in and brown-out to protect the primary MOSFET by ensuring it does not get overheated even with fewer heatsinks during input Undervoltage with tight brown-in/brown-out hysteresis.


The ICC80QSG IC implements a secondary-side regulation (SSR) method, which is ideal for current control during battery charging. For higher design flexibility, it accommodates adjustable on-time mapping at the valley changing position for the desired maximum operating switching frequency, as well as adjustable maximum on-time that limits input power and current, allowing safe operation under low line conditions. 



  • Secondary-side regulation (SSR)

  • Quasi-resonant mode (QRM) operation with continuous conduction mode (CCM)-prevention and valley switching discontinuous conduction mode (DCM) in mid to light load

  • Burst mode for very light loads

  • Reduced gate driver output voltage during burst mode

  • Adjustable on-time mapping at valley changing position

  • Adjustable maximum on-time

  • Comprehensive set of protections

  • Externally configurable hysteresis of brown-in and brown-out

  • Adaptive brown-out level triggering based on bus voltage ripple

  • Soft start



  • Tailored for battery charger application up to 130 W

  • Also suited for adapter, printer, PC, TV, monitor, set-top box, audio amplifier applications up to 130 W

Component Datasheet

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