AC-DC PWM-PFC controller

Wide portfolio of AC-DC controllers for efficient power supplies

link

About

Broadest range of AC-DC PFC and PWM controllers

Infineon’s extensive portfolio of AC-DC controllers includes PFC-CCM ICs, Synchronous Rectification ICs, PFC-half-bridge/LLC combo ICs, Hybrid Flyback ICs, and Battery Charging ICs.

The full range empowers system designers to reduce design complexity, production cost, and development cycles while also increasing overall efficiency, reliability, and performance.

PFC-CCM (continuous conduction mode) ICs
Half-bridge and LLC controller
Synchronous rectification ICs
PFC half-bridge/LLC combo ICs
Hybrid Flyback ICs
Battery charging ICs
Reduced switching losses through Infineon's soft-switching controllers

Infineon offers two types of resonant mode controller ICs (resonant half-bridge converter and LLC resonant mode controller) which drive primary‑side MOSFETs in a half‑bridge and regulate output by varying switching frequency around the resonant tank. By applying ZSC (zero-current) and ZVS (zero-voltage) switching schemes, switching losses are reduced significantly. Consequently, they enable soft switching (ZVS for primary switches and often low‑loss rectification on the secondary), delivering high efficiency, low EMI, and high power density across medium‑to‑high power ranges in applications such as server/telecom PSUs, USB-PD adapters/chargers, industrial and TV power supplies. 

Infineon’s LLC resonant‑mode controller portfolio emphasizes high‑efficiency operation, wide input/output range capability, and integrated features that simplify design and improve robustness. Product features include accurate frequency control, start‑up sequencing, protections (OCP/OVP/OTP, brown‑in/out, capacitive mode protection), and options supporting synchronous rectification coordination.

Explore the half-bridge/LLC controller portfolio
Meet design and performance goals with synchronous rectification ICs

The increasing demand for higher power density, smaller size, more portability, and flexible systems spur the SMPS industry to continuously design new generations of AC-DC power supplies. Infineon's synchronous rectification (SR) ICs are secondary-side driver ICs designed to drive N-Channel power MOSFETs in isolated Flyback and resonant half-bridge converters. They sense drain‑source voltage or timing information and drive an external MOSFET so it conducts when current should flow and turns-off to prevent reverse current. This cuts conduction losses and heat, improves efficiency and power density (especially at low output voltages/high currents), and helps meeting standby/efficiency standards of many consumer or industrial applications.

Infineon’s SR IC portfolio is suitable for topologies such as flyback (including QR/CCM) and other isolated converters and enables high‑efficiency designs. They include robust gate drivers and protection features (e.g., reverse current prevention and safe turn‑off), and are offered in compact packages suitable for cost‑ and space‑optimized power supplies. Target applications are SMPS in servers and telecom, UPS, AC-DC adapters/chargers and LCD TVs.

Explore the SR IC portfolio
Synchronous rectification controller for SMPS

Increasing demands for higher power density, smaller size, more portability, and more flexible systems spur the SMPS industry to continuously design new generations of AC-DC power supplies. We support our customers to meet design and performance goals through a wide portfolio of power devices including synchronous rectification ICs.

PFC-CCM ICs to achieve high efficiency at lower system cost

Infineon's PFC continuous conduction mode (CCM) ICs are used to implement active power factor correction (PFC) in offline AC‑DC front ends. They drive a boost converter so the input current follows the AC line voltage, delivering high power factor and low harmonics while generating a regulated high‑voltage DC bus (typically ~380–400 V) for downstream stages such as LLC or flyback. CCM operation is suitable for higher power levels, offering lower peak currents and good EMI behavior, with protection and control features to meet IEC/EN harmonic limits and efficiency regulations.

The PFC-CCM ICs employ BiCMOS technology and offer advantages such as wider VCC operating range, improved internal oscillator and additional direct bulk capacitor overvoltage protection. Additionally, they are able to achieve 95% efficiency at full load for all input voltage ranges and are highly suitable for applications like servers, telecom/industrial PSUs, and adapters. Product features include average‑current‑mode control, line and load regulation support, start‑up/soft‑start functions, and comprehensive protections (e.g., OVP, OCP, brown‑in/out). 

Explore the PFC-CCM IC portfolio
Hybrid flyback controller for ultra-high power density designs

Infineon's Hybrid Flyback IC family supports the innovative hybrid flyback topology, also known as asymmetrical half-bridge flyback converter. These ICs combine the simplicity of a flyback with the performance of resonant mode and are able to drive both high-and low-side switches in an asymmetric half-bridge flyback topology. Thanks to this innovative approach, ultra-high power density designs with very low standby power consumption is achieved.

Hybrid Flyback ICs can achieve full zero-voltage switching (ZVS) operation on the primary side, and full zero-current switching (ZCS) operation on the secondary side, and the leakage energy is recycled, thereby achieving high efficiency. The duty-cycle directly influences the output voltage, offering a solution to the limitations of the LLC topology in applications requiring a wide range of output voltage.

E-series Hybrid Flyback ICs are optimized for USB-PD and non-USB-PD chargers in compliance with the latest energy saving and efficiency standards from CoC and DoE. Proven compatibility with inbox and aftermarket chargers, notebook adapters, cordless power tool and eBike chargers, LED drivers and ultra high density PSU solutions as TV.

Explore the Hybrid flyback IC portfolio
Explore the Battery charging ICs
Broadest range of AC-DC PFC and PWM controllers

Infineon’s extensive portfolio of AC-DC controllers includes PFC-CCM ICs, Synchronous Rectification ICs, PFC-half-bridge/LLC combo ICs, Hybrid Flyback ICs, and Battery Charging ICs.

The full range empowers system designers to reduce design complexity, production cost, and development cycles while also increasing overall efficiency, reliability, and performance.

PFC-CCM (continuous conduction mode) ICs
Half-bridge and LLC controller
Synchronous rectification ICs
PFC half-bridge/LLC combo ICs
Hybrid Flyback ICs
Battery charging ICs
Reduced switching losses through Infineon's soft-switching controllers

Infineon offers two types of resonant mode controller ICs (resonant half-bridge converter and LLC resonant mode controller) which drive primary‑side MOSFETs in a half‑bridge and regulate output by varying switching frequency around the resonant tank. By applying ZSC (zero-current) and ZVS (zero-voltage) switching schemes, switching losses are reduced significantly. Consequently, they enable soft switching (ZVS for primary switches and often low‑loss rectification on the secondary), delivering high efficiency, low EMI, and high power density across medium‑to‑high power ranges in applications such as server/telecom PSUs, USB-PD adapters/chargers, industrial and TV power supplies. 

Infineon’s LLC resonant‑mode controller portfolio emphasizes high‑efficiency operation, wide input/output range capability, and integrated features that simplify design and improve robustness. Product features include accurate frequency control, start‑up sequencing, protections (OCP/OVP/OTP, brown‑in/out, capacitive mode protection), and options supporting synchronous rectification coordination.

Explore the half-bridge/LLC controller portfolio
Meet design and performance goals with synchronous rectification ICs

The increasing demand for higher power density, smaller size, more portability, and flexible systems spur the SMPS industry to continuously design new generations of AC-DC power supplies. Infineon's synchronous rectification (SR) ICs are secondary-side driver ICs designed to drive N-Channel power MOSFETs in isolated Flyback and resonant half-bridge converters. They sense drain‑source voltage or timing information and drive an external MOSFET so it conducts when current should flow and turns-off to prevent reverse current. This cuts conduction losses and heat, improves efficiency and power density (especially at low output voltages/high currents), and helps meeting standby/efficiency standards of many consumer or industrial applications.

Infineon’s SR IC portfolio is suitable for topologies such as flyback (including QR/CCM) and other isolated converters and enables high‑efficiency designs. They include robust gate drivers and protection features (e.g., reverse current prevention and safe turn‑off), and are offered in compact packages suitable for cost‑ and space‑optimized power supplies. Target applications are SMPS in servers and telecom, UPS, AC-DC adapters/chargers and LCD TVs.

Explore the SR IC portfolio
Synchronous rectification controller for SMPS

Increasing demands for higher power density, smaller size, more portability, and more flexible systems spur the SMPS industry to continuously design new generations of AC-DC power supplies. We support our customers to meet design and performance goals through a wide portfolio of power devices including synchronous rectification ICs.

PFC-CCM ICs to achieve high efficiency at lower system cost

Infineon's PFC continuous conduction mode (CCM) ICs are used to implement active power factor correction (PFC) in offline AC‑DC front ends. They drive a boost converter so the input current follows the AC line voltage, delivering high power factor and low harmonics while generating a regulated high‑voltage DC bus (typically ~380–400 V) for downstream stages such as LLC or flyback. CCM operation is suitable for higher power levels, offering lower peak currents and good EMI behavior, with protection and control features to meet IEC/EN harmonic limits and efficiency regulations.

The PFC-CCM ICs employ BiCMOS technology and offer advantages such as wider VCC operating range, improved internal oscillator and additional direct bulk capacitor overvoltage protection. Additionally, they are able to achieve 95% efficiency at full load for all input voltage ranges and are highly suitable for applications like servers, telecom/industrial PSUs, and adapters. Product features include average‑current‑mode control, line and load regulation support, start‑up/soft‑start functions, and comprehensive protections (e.g., OVP, OCP, brown‑in/out). 

Explore the PFC-CCM IC portfolio
Hybrid flyback controller for ultra-high power density designs

Infineon's Hybrid Flyback IC family supports the innovative hybrid flyback topology, also known as asymmetrical half-bridge flyback converter. These ICs combine the simplicity of a flyback with the performance of resonant mode and are able to drive both high-and low-side switches in an asymmetric half-bridge flyback topology. Thanks to this innovative approach, ultra-high power density designs with very low standby power consumption is achieved.

Hybrid Flyback ICs can achieve full zero-voltage switching (ZVS) operation on the primary side, and full zero-current switching (ZCS) operation on the secondary side, and the leakage energy is recycled, thereby achieving high efficiency. The duty-cycle directly influences the output voltage, offering a solution to the limitations of the LLC topology in applications requiring a wide range of output voltage.

E-series Hybrid Flyback ICs are optimized for USB-PD and non-USB-PD chargers in compliance with the latest energy saving and efficiency standards from CoC and DoE. Proven compatibility with inbox and aftermarket chargers, notebook adapters, cordless power tool and eBike chargers, LED drivers and ultra high density PSU solutions as TV.

Explore the Hybrid flyback IC portfolio
Explore the Battery charging ICs
Documents