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/Subject (The FAN7688 is an advanced Pulse Frequency Modulated \(PFM\) controller for LLC resonant converters with Synchronous Rectification \(SR\) that offers best in class efficiency for isolated DC/DC converters. It employs a current mode control technique based on a charge control, where the triangular waveform from the oscillator is combined with the integrated switch current information to determine the switching frequency. This provides a better control-to-output transfer function of the power stage simplifying the feedback loop design while allowing true input power limit capability. Closed-loop soft-start prevents saturation of the error amplifier and allows monotonic rising of the output voltage regardless of load condition. A dual edge tracking adaptive dead time control minimizes the body diode conduction time thus maximizing efficiency.)
/Title (FAN7688 - Advanced Secondary Side LLC Resonant Converter Controller with Synchronous Rectifier Control)
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2021-08-05T16:08:31+02:00
BroadVision, Inc.
2021-08-05T16:09:41+02:00
2021-08-05T16:09:41+02:00
Acrobat Distiller 19.0 (Windows)
application/pdf
FAN7688 - Advanced Secondary Side LLC Resonant Converter Controller with Synchronous Rectifier Control
Ƶ
The FAN7688 is an advanced Pulse Frequency Modulated (PFM) controller for LLC resonant converters with Synchronous Rectification (SR) that offers best in class efficiency for isolated DC/DC converters. It employs a current mode control technique based on a charge control, where the triangular waveform from the oscillator is combined with the integrated switch current information to determine the switching frequency. This provides a better control-to-output transfer function of the power stage simplifying the feedback loop design while allowing true input power limit capability. Closed-loop soft-start prevents saturation of the error amplifier and allows monotonic rising of the output voltage regardless of load condition. A dual edge tracking adaptive dead time control minimizes the body diode conduction time thus maximizing efficiency.
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