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Sanmei Electric Co., Ltd. announced on August 7, 2015, a control IC "MM3667AFFE" for a secondary side synchronous rectification circuit of a switching power supply (AC-DC converter). Replacing the secondary diode rectifier with a conventional diode rectifier into a synchronous rectifier made up of this new product and power MOSFET can increase the conversion efficiency. According to the company, “In addition to easily satisfying various stringent energy efficiency regulations year by year, it is also possible to reduce the heat generation and to reduce the number of heat sinks, which contributes to the miniaturization and thinness of electronic products.†The new product is suitable for flat panel TVs, home consoles, AC adapters, and switching power supply modules.
The circuit topology of the switching power supply supports half-bridge current resonance (LLC) and flyback quasi-resonant mode (QR). By switching the operating mode, you can choose one of them. A gate drive circuit that drives an external power MOSFET is integrated, and the drive voltage is +6.0 to 15.0V. The user can set the shutdown threshold. The off-time detection method is the drain voltage detection method. By adopting the company's unique control method, it is possible to prevent backflow, misdetection, etc., and achieve stable work.
The input voltage range is +6.0 to 15.0V. The switching frequency range is 25k to 500kHz in the LLC mode and 25k to 200kHz in the QR mode. 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. Sample price is 60 yen (excluding tax). Mass production has begun. The current mass production scale is 300,000 per month, and will increase to 3 million per month after 2018. (Reporter: Yamashita is better than himself)
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