On August 7, 2015, Sanmei Motor released the MM3557AFFE, a secondary side synchronous rectification control IC for an insulated AC-DC converter (switching power supply). The synchronous rectification method is a circuit method in which the secondary side rectifier is replaced by a diode and a power MOSFET, which can greatly improve the conversion efficiency. However, diodes are rectifying due to their characteristics, and power MOSFETs are required to force the flow of current. The new product is used to achieve this function. Sanmei Electric stated that "Because it can improve conversion efficiency, it can not only easily cope with a variety of power efficiency regulations, but also reduce the amount of heat, but also reduce the size of the heat sink, can help reduce the size and thickness of electronic products." . The circuit topology of the switching power supply supports the half-bridge current resonance (LLC) mode and the flyback quasi-resonant (QR) mode. Both modes can be supported by changing the operating mode. The input voltage range is +6.0 to 15.0V. The operating frequency range is 25k to 500kHz in the LLC mode and 25k to 200kHz in the QR mode. The gate drive voltage of the external power MOSFET is +6.0 to 15.0V. The user can set the shutdown detection threshold. The current consumption is 0.66 mA in LLC mode and 0.65 mA in QR mode. The package uses SOP-8J with dimensions of 6.00mm x 5.02mm x 1.65mm. The price was not announced. (Special Contributor: Yamashita is better than himself)
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Sanmei Motor launches secondary synchronous rectification control IC for switching power supply