NCP1340B1 NCP43080D NCP431A High Efficiency, <30mW Standby QR Adapter
■ The NCP1340 is a highly-integrated quasi-resonant flyback controller suitable for designing high- performance off-line power converters. With an integrated active X2 capacitor discharge feature, the NCP1340 enables no-load power consumption below 30 mW.
■ The quasi-resonant operating mode features a proprietary valley-lockout circuitry ensuring stable valley switching down the 6 th valley. After the 6 th valley the controller transitions to a frequency foldback mode to reduce switching losses in lighter load conditions. As the load continues to decrease the NCP1340 will enter a Quiet-Skip™ mode to efficiently manage power delivery while minimizing acoustic noise.
■ Secondary side synchronous rectification (SR) is implemented with the NCP43080 for optimized efficiency across all operating modes. The NCP43080 features precise zero current turn off and 12 ns turn-off delay from current sense to the driver allowing for the optimal SR conduction period in quasi-resonant mode. The light load detection (LLD) feature modulates the drive voltage as the load decreases and shuts down the driver for optimal light and no-load performance.
●Key Features:
■High-Voltage Startup Circuit with Active Input Filter Capacitor Discharge and Brownout Detection for Reduced Standby Power
■Valley Switching Operation to 6 th valley with Valley-Lockout for Stable Operation
■Frequency Foldback with 25 kHz Minimum Frequency Clamp
■Quiet-Skip™ Operation for Highest Performance in Light and No-Load
■Minimized Current Consumption for No Load Power Below 30 mW.
■Frequency Jitter for Reduced EMI Signature
■Adjustable Maximum Frequency Clamp
■Fault Input for Severe Fault Conditions, NTC Compatible (Latch and Auto-Recovery Options)
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[ Adapter ][ designing high- performance off-line power converters ] |
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Application note & Design Guide |
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Please see the document for details |
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SMA;SOIC-8;DFN-8;SOT-23 |
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English Chinese Chinese and English Japanese |
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July 2016 |
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Rev. 0 |
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DN05089/D |
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1 MB |
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