FAN6210,FAN6206 Primary-Side Synchronous Rectifier (SR) Trigger Solution for Dual-Forward Converter
●In any switching converter, rectifier diodes are used to obtain DC output voltage. The conduction loss of diode rectifier contributes significantly to the overall power losses in a power supply; especially in low output voltage applications, such as personal computer (PC) power supplies. The conduction loss of a rectifier is proportional to the product of its forward-voltage drop and the forward conduction current. Using synchronous rectification (SR) where the rectifier diode is replaced by MOSFET with proper on resistance (Rds^), the forward-voltage drop of a synchronous rectifier can be lower than that of a diode rectifier and. consequently, the rectifier conduction loss can be reduced.
●The highly integrated FAN6210 is a primaiy-side SR controller for dual-forward converter that provides control signals for the secondary-side SR driver FAN6206. FAN6210 also provides drive signal for the primary-side power switches by using an output signal from the PWM controller. FAN6210 can be combined with any PWM controller that can drive a dual-forward converter. To obtain optimal timing for the SR drive signals, transformer winding voltage is aho monitored. To improve light-load efficiency, green-mode operation is employed, which disables the SR turn-on trigger signal, minimizing gate drive power consumption at light-load condition.
●This application note describes the design procedure of SR circuit using FAN6210 and FAN6206. The guidelines for printed circuit board (PCB) layout and a design example with experiment results are also presented.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2021/8/6 |
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Rev. 1.0.0 |
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AN-6206 |
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701 KB |
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