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Renesas 700V Switching Buck Regulators offer unmatched features for Smart Appliances and Industrial Controls, evaluation board and samples available from Anglia

Renesas have unveiled a family of 700V buck regulators that offers designers numerous advantages over competitive solutions. The RAA2230XX family deliver superior power consumption, noise and EMI suppression, as well as reduced overall system cost.

The RAA2230XX family are universal input AC/DC switching buck regulators that feature a 700V integrated MOSFET capable of delivering up to 8W output power depending on model selected, with the output voltage as low as 3.3V and various package options. The converters feature a unique constant-off-time control method that helps to achieve ultra-low standby power, negligible EMI, and no audible noise. The product family also supports secondary-side-feedback isolated flyback topology. The family combines constant off-time control for heavy load and Pulse Frequency Modulation (PFM) for light-load operation. Constant off-time controls switching frequency above the audible frequency of approximately 50kHz (30kHz for RAA223011). PFM eliminates any potential audible noises while offering superior light-load efficiency and ultra-low power consumption < 10mW at no load (< 20mW at no load for RAA223021). Efficiency is achieved up to 80% (75% for RAA223012). The built-in frequency dithering further reduces the EMI noise spectrum.

 

Free Samples and Evaluation Board   
Key Features
  • Wide input voltage range 20VAC to 305VAC
  • Wide DC voltage output range from 3.3V to 54V
  • Available in a choice of 2.5W, 5W and 8W power outputs
  • Support both non-isolated buck and isolated flyback topologies
  • Ultra-low 10mW to 20mW standby power consumption
  • Low quiescent current (< 100μA)
  • Minimal EMI and no audible noise
  • Programmable PFM allows optimization of COUT for various standby power requirements
  • Protection features:
    • Short-Circuit Protection (SCP)
    • Overload Protection (OLP)
    • Open Feedback Protection
    • Over-Temperature Protection (OTP)
  • Available in TSOT23-5, SOIC-8 and SOIC-7 package options
Data

The RAA2230XX buck regulators consume only 10mW to 20mW when idle, helping system designers meet ever-tightening standby power regulations. They feature a unique switching algorithm which minimizes electromagnetic interference (EMI) and eliminates audible noise, such as ‘humming’ or ‘whining’ that can affect competitors’ solutions. The new regulators can also supply as low as 3.3V output, enabling designers to eliminate a second-stage low dropout regulator (LDO), saving BOM cost and board space. Furthermore the regulators have been designed to be pin-to- pin compatible with other industry competitors devices, this allows designers to take advantage of the advanced features in the RAA2230XX family on existing designs without an expensive and time consuming redesign of the PCB.

Most domestic appliances, power adapters, and sensor devices such as smoke alarms are powered by AC wall sockets. Because these loads require a constant DC voltage to function, AC/DC conversion between the AC source and the loads is required. This conversion can be accomplished with a non-isolated buck-converter, as shown in below schematic, or through isolated topologies like flyback converters.

Basic AC/DC conversion topology (buck)

There are some critical common challenges encountered during the development of the AC/DC converter:

  • During the design phase, sometimes audible noise issues are found and often result in hours of extended troubleshooting and extra cost to fix them
  • Standby power consumption has become increasingly important to meet regional regulatory requirements including the European Commission Code of Conduct (COC) and US Department of Energy (DOE) Energy Star
  • Implementing new ICs typically require re-qualifying for safety compliance if PCB changes are made but that process is simplified with pin-to-pin or BOM-to-BOM replacements

Renesas have addressed these challenges with the RAA223011, RAA223012 and RAA223021 700V buck regulators, the schematic for the non-isolated buck configuration is shown in below schematic and the devices also support isolated flyback topologies.

RAA2230xx 700V regulator family schematic

The converters are available in a range of package options, TSOT23-5, SOIC-8 and SOIC-7, and have an operating temperature range from -40 to +125°C.

The RAA2230XX family is ideal for a wide range of applications, including home appliances, sensing systems such as smoke alarms and gas sensors, white goods, power meters and industrial controls.

Design Support

The RAA2230XX family is supported by a range of evaluation boards which allow developers to explore the full features of the high voltage flyback converters, the boards demonstrate low-cost high performance isolated or non-isolated AC/DC conversion from a universal input of 85VAC to 265VAC, to a low voltage DC output with various output currents up to 1A. The evaluation boards feature built-in overcurrent, short-circuit, input brownout and over-temperature protections, and are designed on a double side Printed Circuit Board (PCB) with a full-wave input rectification. Some of the boards are also pre-compliant with the conducted EMI requirements by EN55022/CISPR 22 allowing use as a reference design saving valuable development time and cost.

Winning Combinations

The RAA2230XX buck regulators can be connected to the AC line allowing them to power MCUs, sensors and other digital ICs within the system. Renesas has developed numerous Winning Combinations that include the new devices. Winning Combinations consist of complementary analog, power, timing devices and embedded processing, and provide an easy-to-use architecture, simplifying the design process and significantly reducing design risk for customers in a wide variety of applications. For example, the Household Smoke Detector winning combination demonstrates a turnkey architecture for a residential smoke alarm, suitable for smart industrial control terminals. For this and additional Renesas solutions, go to www.renesas.com/win. Renesas offers over 200 winning combinations with compatible devices that work together seamlessly.

Anglia are offering customers a FREE evaluation board and samples of the RAA2230XX family of high voltage buck converters from Renesas, please fill in the form below to register for evaluation kit and samples now.

To register for a FREE evaluation board and samples of the RAA2230XX family of high voltage buck converters from Renesas, please fill in the form below

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FREE samples for UK and Ireland customers only, subject to availability.

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