15W to 65W power converter
Find reference designs, recommended SMPS IC products, online simulations and design resources for your SMPS circuit - suitable for power supplies from 15W up to 65W.
Typically power supplies in the categories of 15W to 65W like adapters and chargers are designed in a small form factor. Infineon‘s reference designs and solutions are developed to demonstrate high performance by meeting various regulatory limits as well as allowing for small form factor designs. The solutions are driven for example by Infineon’s digital flyback controller XDPS21071, 700V MOSFET (IPD70R360P7S), synchronous-rectification MOSFET (BSC0805LS) and small-signal-MOSFET (BSL606SN).
Wide universal input voltage ranges are supported as the designs are used world-wide fitting the different grid AC categories. The layouts supply various output voltages like 5V/3A, 9V/3A, 12V/3A, 15V/3A and 20V/2.25A with a peak efficiency above 90%, combined with lowest standby input power enabled by Infineon‘s silicon and silicon carbide power MOSFETs and digital controllers.
Check our recommended products for your design in the block diagram and surf through the provided reference designs. To speed up your design in the process we provide evaluation boards and online simulations.
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Manufacturing slimmer and lighter adapters require ICs enabling high efficiency with good electromagnetic interference (EMI) performance and low standby power. There is also a need for cost-effective MOSFETs in small packages that feature good EMI and excellent thermal performance. Infineon offers a wide range of products specifically designed for adapters including high voltage MOSFETs and controls ICs for PFC and PWM stages, as well as low voltage MOSFETs for synchronous rectification. With these products, Infineon supports the trend towards a significantly higher efficiency level, especially in partial load conditions, as well as miniaturization of the adapter. New control ICs support topologies such as quasi-resonant flyback, and a digital-based XDP controller can enable the forced frequency resonant flyback (zero voltage switching) operation, making it ideal to implement in high power density adapters and supporting USB-PD requirements. Regional regulations and a general increased sensitivity toward the containment of electronic waste are pointing toward the adoption of universal adapters. The implementations, methodologies, and protocols are not yet harmonized; however, Infineon is already closely monitoring and partnering with the decision-makers to timely ensure the offer of a competitive semiconductor solution. The capability to efficiently manage different power classes and protocols are key in this application, and Infineon is getting ready to support adapter makers in this challenge.
For low output power applications, the flyback converter is the most widely used topology when galvanic isolation and/or multiple outputs are required because it has a low system cost and is easy to design. It is used as main power supply for lower-power appliances and devices (e.g. TVs, set-top boxes, chargers/adapters, etc.) and auxiliary power supplies for higher-power applications (e.g. air-con, PC power, server power, industrial SMPS, etc.).
The two common switching modes of operation of flyback are Fixed Frequency (FF) and Quasi-Resonant (QR). The choice of switching mode depends on many factors such as power, efficiency, form factor, development time and so on.
FF flyback switches come in a pre-defined fixed switching frequency. They can operate either in Discontinuous Conduction Mode (DCM) or Continuous Conduction Mode (CCM).
QR switching frequency is variable. The switching frequency of a conventional QR controller increases exponentially as the load decreases.
The table below lists the advantages and disadvantages of each flyback switching mode. This can vary depending on different conditions.
| Application parameter | FF DCM | FF CCM | QR |
| MOSFET conduction loss, transformer winding loss and output diode conduction loss | Highest
|
Low
|
High
|
| Output diode reverse recovery loss(transition from conducting to blocking state) | Virtually zero
|
High
|
Virtually zero
|
| MOSFET switch-on loss | Low
|
Highest
|
Lowest
|
| Output capacitor | Big
|
Smallest
|
Big
|
| Feedback and current loop stability design | Easy
|
Hard
|
Medium
|
| Transformer design | Easy
|
Medium
|
Easy
|
| Application parameter | FF DCM | FF CCM | QR |
| inductance design | |||
| Operating frequency | Fixed | Fixed | Variable
|
| Maximum power delivery input line dependency | Accurate | Less accurate
|
Less accurate
|
| Average efficiency | Low
|
High
|
Best
|
| Power range | Low
|
High
|
Medium
|
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