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AC-DC PFC and LLC

NE3389 Synchronous Rectification Controller

Features
• Wide VCC Voltage Range from 4.6V-36V
• Ultra-Low Quiescent Current <100uA
• Reduces the Chance of False Triggering in Discontinuous Conduction Mode (DCM)
• 10ns Fast Turn-off Delay
• VGA/VGB Clamping Circuit for Low Vth SR MOSFET
• -3V Drain Voltage Spike Tolerance
• True Differential Inputs for VDS Sensing of Each SR MOSFET
• Interlock Logic Between Two-Channel
• Adaptive Gate Drive for Maximum Efficiency
• Available in SOP-8 Package
Applications
• AC/DC Adapters for Mobile Phone and Notebook
• Industrial Power Supplies
• Desktop All-in-one PC Power Supplies
• High Power Density Power Supplies
    The NE3389 is a dual-channel synchronous rectifier (SR) controller for high performance power system. With the ultra-low quiescent current, appropriate gate drive method and independent sampling input, the NE3389 can achieve maximum efficiency under different load conditions. The NE3389 operates over a wide supply voltage range from 4.6V to 36V, which is suitable for a variety of application scenarios. With dual-channel drivers and independent differential sampling, it is easy to use. The extremely low turn-off propagation delay time (10ns) and high sink current (~2.5A) capability of the driver reduce SR MOSFET VDS stress. The unique VG clamping circuit prevents VG from turning on by fast rising at VD pin under low VCC condition, that avoids the shoot through between primary side and secondary side during system startup.
    The NE3389 has appropriate logical protection features, two-channel interlock logic with proper interlock time to make the system more reliable.
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    NE3389 PDF 1.18 MB
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