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reference designNCP1340 | Demoboard NCP1340UHDGEVB

Onsemi NCP1340 | Demoboard NCP1340UHDGEVB

Quasi-Resonant Controller, High-Voltage, Featuring Valley Lock-Out Switching

Overview

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Description

The NCP1340UHDGEVB Evaluation Board is designed to effectively evaluate the NCP1340, which 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 can enable no−load power consumption below 30 mW. The quasi−resonant current−mode flyback stage features a proprietary valley−lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to a frequency foldback mode to reduce switching losses. As the load decreases further, the NCP1340 enters quiet−skip mode to manage the power delivery. To help ensure converter ruggedness, the NCP1340 implements several key protective features such as internal brownout detection, a non−dissipative Over Power Protection (OPP) for constant maximum output power regardless of input voltage, a latched over voltage and NTC−ready over temperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the line is removed

Features

  • QR Frequency Jittering
  • New Quiet-Skip Technology
  • Integrated HV Startup with Brownout Protection
  • Valley Switching Operation with Valley Lockout
  • Integrated X2 Capacitor Discharge Capability
  • NTC Compatible Fault Pin
  • High Drive Capability: -500 mA / +800 mA
  • Latch input for OVP and OTP implementations

Typical applications

  • Medium or High Power AC-DC Adapters / Ultra High Density AC-DC Adapters

More information

Products

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VR(V (AC))
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890324025039CS
SPECWCAP-FTX2 Film Capacitors, Across the mains, 470 nF
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-FTX2 Film Capacitors
ApplicationAcross the mains 
Capacitance470 nF
Rated Voltage275 V (AC)
Safety ClassX2 
Rate of Voltage Rise220 V/µs
Dissipation Factor0.1 %
Insulation Resistance21.28 GΩ
Pitch15 mm
Length18 mm
Width8 mm
Height14 mm
PackagingCarton 
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7508112428
SPECOffline Transformer, –, –
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Status Activei| Production is active. Expected lifetime: >10 years.
Product series Offline Transformer
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