AC-DC Power Conversion

Optimize AC to DC conversion efficiency with integrated power stages and PWM-PFC controllers

Increased AC to DC converter efficiency

Our fixed-frequency high-performance CoolSET™ devices increase AC to DC conversion efficiency with lower switching frequencies under mid- and light-load conditions thanks to the integrated frequency reduction mode. The quasi-resonant CoolSET™, integrating an intelligent digital algorithm, allows the PWM controller to minimize the switching frequency spread under different AC line input conditions.

What are CoolSET™ AC-DC power adapter ICs used for?

Our AC to DC integrated circuits (ICs) are designed to increase conversion efficiency across a wide application spectrum. Typical use cases include:

• TV power supplies
• PC power supplies
• General power supplies
• Power adapters
• Fast chargers
• Auxiliary power supplies for servers, home appliances, motor drives, telecom systems, and many more

Perfect SMPS controller for emerging AC-DC designs

We also provide a broad selection of high-efficiency, high-performance PWM-PFC controllers to support emerging requirements, driven by PFC regulations and customer demands for ultra-low standby power and increased AC-DC power conversion efficiency at low cost. Our PFC controllers support both discontinuous conduction mode (DCM) and continuous conduction mode (CCM). Wider VCC operating ranges can be achieved with CCM designs.

Maximizing LLC controller performance

You can look forward to a higher level of efficiency at low switching losses with our LLC resonant mode control ICs. Our XDP™ SMPS digital multi-mode PFC and LLC combo controllers offer high performance with integrated drivers and 600V depletion cells designed for boost PFC and half-bridge LLC. This makes them ideal as switched-mode power supply controllers (SMPS controllers).

This rich offering of high-performance, integrated AC-DC power stages, complemented by PWM-PFC and LLC controllers, gives today’s designers the perfect formula to supercharge their AC-DC designs.

AC-DC Power Conversion subcategories

AC-DC Integrated Power Stage – CoolSET™

CoolSET™ products for high-performance applications
AC-DC Integrated Power Stage – CoolSET™ subcategories

• Fixed Frequency CoolSET™
• Quasi Resonant CoolSET™

With increased reliability and outstanding performance, Infineon’s CoolSET™ AC-DC integrated power stages are designed to offer additional protection to increase system robustness. To achieve fast start-up performance, the 5th generation controller utilizes the high voltage power supply integrated circuit together with an internal AC-DC switching regulator to operate the start-up sequence in a safe and rapid manner, which is commonly known as cascode configuration.

With the latest CoolSET™ 5th generation flyback controller with integrated MOSFET, Infineon introduces AC-DC integrated power stages in fixed frequency and quasi resonant switching scheme. The products show high-performance with the integration of the latest 700V and 800V CoolMOS™ P7 power MOSFET family in both DIP-7 and DSO-12 packages. Both fixed frequency and quasi-resonant switching scheme have been enhanced from prior generation to offer greater performance and increase robustness.

AC-DC Integrated Power Stage Products

Infineon’s AC-DC integrated Power Stage product portfolio includes the Fixed Frequency CoolSET™ and Quasi Resonant CoolSET™ range of products. Integrated with 700V and 800V avalanche rugged CoolMOS™ P7 family, the CoolSET™ product range is available in both through-hole and SMD packages and thereby eliminates the need of a heatsink and reduces BOM count with a small footprint. The Quasi Resonant CoolSET™ is available in both 2nd and 5th generation configurations while the range of Fixed Frequency CoolSET™ products are available in 3rd and 5th generation configurations.

5th generation CoolSET™

The 5th generation CoolSET™ power supply integrated circuit is targeted for SMPS applications such as auxiliary power supply for home appliances (e.g. washing machines, refrigerators and air-condition), set-top-boxes, LCD/LED monitors, telecom/server, and general purpose power supply up to a maximum output power of 43W.

Common features of 5th generation of CoolSET™ are:

• Integrated with 700V and 800V avalanche rugged CoolMOS™ P7 family
• Fast and robust start-up operation with cascode configuration
• Multi-level selectable entry/exit active burst mode profile
• Built-in digital soft-start
• Cycle by cycle peak current limitation
• Digital frequency reduction with decreasing load for higher efficiency
• VCC pin short to ground protection
• OLP, output short, OTP with hysteresis and VCC over/under voltage protection
• Auto-restart for all protection features

AC-DC PWM-PFC Controller

The perfect fit for every design challenge
AC-DC PWM-PFC Controller subcategories

• Half-bridge and LLC controller
• PWM-FF (fixed frequency) Flyback ICs
• PWM-QR (quasi resonant) Flyback ICs
• PFC-DCM (discontinuous conduction mode) ICs
• PFC-CCM (continuous conduction mode) ICs
• Synchronous Rectification ICs
• Digital PFC + LLC Combo IC
• Advanced flyback

By offering a wide variety of highly efficient AC-DC pulse-width modulation controllers, we enable our customer to meet new demands driven by changes in power factor correction (PFC) regulations and by the need to deliver ultra-low standby power across a growing number of applications.

What applications are AC-DC PWM-PFC controllers suited to?

Our broad portfolio of AC-DC PWM controller ICs brings new levels of cost-effectiveness to applications such as switched-mode power supplies (SMPS) for TVs or PCs, as well as power adapters and fast chargers. A comprehensive array of safety features helps minimize the number of external components, reduces design-in time, and improves SMPS and converter designs reliability.