DC/DC converter integrates DC fan motor speed control capability
Until now, according to Rohm, 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.
The BD9227F is presented as the 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 relative to conventional discrete configurations, Rohm uses its own IC analogue circuit design technology to achieve circuit optimization along with high frequency (1 MHz) 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 300 mA output), contributing to greater accuracy, increased miniaturization, and higher power conversion efficiency in DC fan motor applications. Integrating a high-side PMOS transistor makes it possible to generate an output voltage at 100% duty.
Packaging is SOP8 (5.00mm x 6.20mm x 1.71mm)
Input Voltage Range; 6V to 20V
Output Voltage Range; VCC*0.25V to VCC
Reference Voltage; 1.0V±1.0% (25°C), ±2.0% (-40°C to 85°C)
Switching Frequency; 1.0MHz (typ.)
Output Current; 1A (max.)
Operating Temp. Range; -40°C to 85°C
Rohm; www.rohm.com/web/eu/
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