ROHM: DC/DC converter capable of DC fan motor speed control

ROHM has recently announced the availability of a buck DC/DC converter optimized for DC fan motor power supplies used in applications such as cold air circulation in refrigerators.

In recent years, ‘Smarter’, ‘Smaller’, and ‘Higher Efficiency’ have emerged as the 3 biggest challenges facing the electronics industry, which is experiencing increased market demand. In addition, it is said that close to 50% of the world’s electricity demand is used to drive motors, making it necessary to achieve more intelligent, compact, high efficiency motor drive in order to protect the environment and improve structural designs.

Until now, however, DC fan motor power supply blocks used in refrigerators and other equipment are primarily configured using discrete components, making it difficult to provide high accuracy control or carry out high frequency drive. As a result larger coils and output capacitors are required for the peripheral circuit, increasing mounting area considerably, which can be problematic.

The BD9227F is the industry’s first power supply IC capable of controlling the rotational speed of DC fan motors with high accuracy by linearly varying the output voltage based on the PWM duty signal generated by the MCU. In addition to more accurate control vs conventional discrete configurations, ROHM leverages proprietary IC analog circuit design technology to achieve circuit optimization along with high frequency (1MHz) drive. This supports the use of smaller peripheral components (i.e. coil, output capacitor), reducing footprint by 75% while improving power conversion efficiency by 19% (at 300mA output), contributing to greater accuracy, increased miniaturization, and higher power conversion efficiency in DC fan motor applications.

PWM is a method for controlling the output voltage by varying the ON/OFF times in each cycle through repeated switching. Duty refers to the ON-time ratio within each PWM period, with a higher ratio corresponding to higher output voltage.


Bs&T at PCIM2018

powerlosstester presenting BsT-pulse 3 phase version and BsT-SQ for powerloss measurement of inductive components new findings of tester, the highest Bs ferrite material D9B for SiC application GaN fe...


Würth and AnDAPT describe their new programmable power solution

In this video an engineer from AnDAPT describes their new programmable power solution and their partnership with Würth at the APEC exhibition  in San Antonio, Texas. Drawing from Würth&...


MAGMENT: Magnetizable concretes, sole enablers for dynamic inductive wireless charging.

MAGMENT is a patented material technology, engineered from cement and magnetic particles from recycled electronic waste. We are the inventors and sole company worldwide to offer both the concrete mate...


A look at Analog Devices' wireless power demonstration at APEC 2018

In this video Steve from Analog Devices walks us through a wireless power transmission demonstration at APEC 2018 in San Antonio, Texas. The LTC4120 is a constant-current/constant-voltage wireless rec...


Analog Devices talks about their Power over Ethernet solutions at APEC

In this video Analog Devices talks about their Power over Ethernet solutions at APEC 2018 in San Antonio, Texas. Their LTC4291 provides four PSE Ports with two power channels per port, and is fully co...


Silicon Labs demonstrates their latest PoE solutions at APEC 2018

In this video John Wilson of Silicon Labs demonstrates their latest Power over Ethernet solutions at APEC 2018 in San Antonio, Texas. The live demonstration shows how a remote device can effectively p...


Vitrek explains their advanced testing solutions at APEC 2018

In this video Vitrek explains their advanced testing solutions at APEC 2018 in San Antonio, Texas. The devices displayed includes their 4700 high-voltage meter, which can measure up to 10kV and can pe...


Dirk Giesen describes the Parasoft tool suite for Embedded Software Development

Are you responsible for embedded software development in your organization? Your goal should be to create safe, secure, and reliable software. To make sure your device will work properly, deploy Paras...


Ross Sabolik of Silicon Labs talks about advanced Power over Ethernet

In this video Ross Sabolik of Silicon Labs talks about smart  Power over Ethernet systems with Alix Paultre at their APEC exhibit in San ANtonio, Texas. As PoE migrates to higher power levels and...


Dialog Semi walks through their latest IC solutions for battery chargers

In this video an engineer from Dialog Semiconductor walks us through their latest ICs for battery chargers at APEC 2018. Dialog's Qualcomm Quick Charge adapter solutions offer high efficiency to e...


Steve Allen of pSemi explains their latest LED driver solution

Steve Allen of pSemi explains their latest LED boost product based on Arctic Sand's two-stage architecture. Their PE23300 has a charge-pump, switched-capacitor architecture that offloads most of t...


Teledyne describes their latest 12-bit Wavepro HD oscilloscope

In this video Teledyne LeCroy describes their latest Wavepro HD oscilloscope to Alix Paultre of Power Electronics News at the company's launch event. The WavePro HD high-definition oscilloscope de...