NCP1341B1 NCP4305D NCP431A High Efficiency, <30mW Standby QR Adapter with Peak Power Excursion Capability
■ The NCP1341 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 NCP1341 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 NCP1341 will enter a Quiet-Skip™ mode to efficiently manage power delivery while minimizing acoustic noise.
■ For systems requiring high transient load capability the NCP1341 features a power excursion mode (PEM) which transitions the controller into continuous conduction mode (CCM) enabling peak transient power delivery up to 2 times the nominal load power.
■ Secondary side synchronous rectification (SR) is implemented with the NCP4305 for optimized efficiency across all operating modes. The NCP4305 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 NCP4305 also features an ultrafast turn-off interface through the TRIG/DIS pin capable of turning off the driver in 7.5ns to minimize cross conduction in CCM operation. Finally, 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)
■Adjustable Maximum Frequency Clamp
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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;SMB;SOT-23;SOIC-9 |
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English Chinese Chinese and English Japanese |
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May 2016 |
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Rev. 1 |
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DN05086/D |
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1.7 MB |
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