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reference designNCP1945 | Demoboard EVBUM2946/D

Onsemi NCP1945 | Demoboard EVBUM2946/D

Overview

TopologyFlyback Converter
Input voltage90-264 V

Description

This evaluation board user’s manual describes a 100 Wconstant voltage power supply intended forhigh-performance off-line USB-PD and USB Type-C powerconverters. The evaluation board (EVB) uses the NCP1945,a combination IC which integrates power factor correction(PFC) and quasi-resonant flyback functionality. Keyfeatures of the NCP1945 demonstrated on this board includeBoost follower, Dynamic Response Enhancer (DRE),Power Excursion Mode (PEM), adjustable PFC enable anddisable thresholds, and several protections features whilemaintaining low cost, high efficiency, and low standbypower consumption.

Features

  • PFC: Follower Boost Capability
  • PFC: Adjustable Enable and Disable Threshold
  • Integrated High-voltage Startup Circuit with BrownoutDetection
  • Integrated X2 Capacitor Discharge Capability
  • Dual Range Vcc, with 150 V VccH Pin for Connection toHigh Voltage Aux Winding
  • Primary Side Based Constant Output Current Limiting
  • Latching or Auto-recovery Timer-Based Overload Protection
  • QR: Abnormal Overcurrent Fault Protection for WindingShort Circuit Detection
  • QR: Valley Switching Operation with Valley-lockout forNoise-free Operation
  • QR: Frequency Foldback with 25 kHz Minimum Frequency
  • QR: Rapid Frequency Foldback for Fast Reduction ofSwitching Frequency
  • QR: Frequency Jittering for Reduced EMI Signature
  • QR: Adjustable Overpower Protection
  • Power Excursion Mode (PEM) Enables use of Low BulkCapacitance

Typical applications

  • USB-PD

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
IR(A)
L(mH)
RDC max.(mΩ)
VR(V (AC))
VT(V (AC))
Material
L(mm)
W(mm)
H(mm)
Mount
SamplesAvailability & Sample
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7448022010
SPECWE-CMBNC Common Mode Power Line Choke Nanocrystalline, 2 A, 10 mH
Simu­lation
Availability
–
Downloads11 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-CMBNC Common Mode Power Line Choke Nanocrystalline
Rated Current2 A
Inductance10 mH
DC Resistance85 mΩ
Rated Voltage300 V (AC)
Insulation Test Voltage2100 V (AC)
MaterialNanocrystalline 
Length18 mm
Width14 mm
Height22 mm
MountTHT 
–Check availability
7448023005
SPECWE-CMBNC Common Mode Power Line Choke Nanocrystalline, 3 A, 5 mH
Simu­lation
Availability
–
Downloads11 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-CMBNC Common Mode Power Line Choke Nanocrystalline
Rated Current3 A
Inductance5 mH
DC Resistance40 mΩ
Rated Voltage300 V (AC)
Insulation Test Voltage2100 V (AC)
MaterialNanocrystalline 
Length18 mm
Width14 mm
Height22 mm
MountTHT 
–Check availability