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reference designNCP4305D | Demoboard ONSEC-18-022

Onsemi NCP4305D | Demoboard ONSEC-18-022

Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies

Overview

TopologyFlyback Converter

Description

The NCP4305 is high performance driver tailored to control a synchronous rectification MOSFET in switch mode power supplies. Thanks to its high performance drivers and versatility, it can be used in various topologies such as DCM or CCM flyback, quasi resonant flyback, forward, and half bridge resonant LLC.The combination of externally adjustable minimum off-time and on-time blanking periods helps to fight the ringing induced by the PCB layout and other parasitic elements. A reliable and noise less operation of the SR system is insured due to the Self Synchronization feature. The NCP4305 also utilizes Kelvin connection of the driver to the MOSFET to achieve high efficiency operation at full load and utilizes a light load detection architecture to achieve high efficiency at light load.The precise turn−off threshold, extremely low turn−off delay time and high sink current capability of the driver allow the maximum synchronous rectification MOSFET conduction time and enables maximum SMPS efficiency. The high accuracy driver and 5 V gate clamp enables the use of GaN MOSFETs.

Features

  • Precise True Secondary Zero Current Detection with Adjustable Threshold
  • Typically 20 ns Turn off Delay from Current Sense Input to Driver
  • Zero Current Detection Pin Capability up to 200 V
  • Optional Ultrafast (7ns) Trigger Input
  • Disable Input
  • Adjustable Minimum ON Time and Minimum OFF Time
  • Self Synchronization
  • 8 A Sink, 4 A Source Drive capability
  • Light Load Detection with Modulated Gate Drive
  • 4.5 V & 9 V UVLO Options and 36 V(Max)

Typical applications

  • High Power Density AC/DC Power Supplies

More information

Parts approved by Onsemi

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Order Code
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Product series
λDom typ.(nm)
Emitting Color
λPeak typ.(nm)
IV typ.(mcd)
VF typ.(V)
Chip Technology
2θ50% typ.(°)
Application
C
Safety Class
dV/dt(V/µs)
DF @ 1 kHz(%)
RISO
Pitch(mm)
ISAT,10%(A)
fres(MHz)
Version
SW(mm)
Ti
To
Endurance(h)
IRIPPLE(mA)
ILeak(µA)
DF(%)
Ø D(mm)
Pins
Type
G(mm)
Working Voltage(V (AC))
Operating Temperature
Operation Force(g)
Schematic
Packaging
IR(A)
L(mH)
RDC max.(mΩ)
VR(V (AC))
VT(V (AC))
Material
L(mm)
W(mm)
H(mm)
Mount
VRMS(V)
VDC(V)
VBR(V)
IPeak(A)
Wmax(J)
PDiss(mW)
VDE Approval
SamplesAvailability & Sample
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155124BS73200
SPECWL-SMSW SMT Mono-color Side View Waterclear, 470 nm, Blue
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Product seriesWL-SMSW SMT Mono-color Side View Waterclear
Dominant Wavelength [typ.]470 nm
Emitting ColorBlue 
Peak Wavelength [typ.]468 nm
Luminous Intensity [typ.]150 mcd
Forward Voltage [typ.]3.4 V
Chip TechnologyInGaN 
Viewing Angle Phi 0° [typ.]120 °
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PackagingTape and Reel 
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Length3.2 mm
Width1.5 mm
Height1 mm
MountSMT 
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Power Dissipation95 mW
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7448030509
SPECWE-CMBNC Common Mode Power Line Choke Nanocrystalline, –, –
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Product seriesWE-CMBNC Common Mode Power Line Choke Nanocrystalline
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Pins4 
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Pin length5 mm
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Operating Temperature -55 °C up to +125 °C
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Rated Current5 A
Inductance9 mH
DC Resistance32 mΩ
Rated Voltage300 V (AC)
Insulation Test Voltage2100 V (AC)
MaterialNanocrystalline 
Length23 mm
Width13.5 mm
Height26 mm
MountTHT 
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VDE Approval40048238 
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744823422
SPECWE-CMB Common Mode Power Line Choke, –, –
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Product seriesWE-CMB Common Mode Power Line Choke
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Pin length3 mm
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Operating Temperature -40 °C up to +125 °C
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Rated Current4 A
Inductance2.2 mH
DC Resistance30 mΩ
Rated Voltage250 V (AC)
Insulation Test Voltage1500 V (AC)
MaterialMnZn 
Length23.5 mm
Width13.8 mm
Height25.5 mm
MountTHT 
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VDE Approval40042670 
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820412711
SPECWE-VD Disk Varistor, –, –
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Product seriesWE-VD Disk Varistor
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Application230 VAC 
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Diameter12.5 mm
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Length12.5 mm
Width4.4 mm
Height16 mm
MountTHT 
AC Operating Voltage275 V
DC Operating Voltage350 V
(Reverse) Breakdown Voltage430 V
(Reverse) Peak Pulse Current3500 A
Energy Absorption80 J
Power Dissipation400 mW
VDE ApprovalYes 
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890324023023
SPECWCAP-FTX2 Film Capacitors, –, –
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Product seriesWCAP-FTX2 Film Capacitors
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ApplicationAcross the mains 
Capacitance100 nF
Safety ClassX2 
Rate of Voltage Rise300 V/µs
Dissipation Factor0.1 %
Insulation Resistance30 GΩ
Pitch10 mm
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Pin length18 mm
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Length13 mm
Width7 mm
Height13 mm
MountBoxed THT 
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890324024003
SPECWCAP-FTX2 Film Capacitors, –, –
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Product seriesWCAP-FTX2 Film Capacitors
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ApplicationAcross the mains 
Capacitance330 nF
Safety ClassX2 
Rate of Voltage Rise260 V/µs
Dissipation Factor0.1 %
Insulation Resistance30 GΩ
Pitch12.5 mm
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Pin length18 mm
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Rated Voltage275 V (AC)
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Length15 mm
Width8.5 mm
Height14 mm
MountBoxed THT 
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7447055
SPECWE-FI Leaded Toroidal Line Choke, –, –
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Product seriesWE-FI Leaded Toroidal Line Choke
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Pin length15 mm
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Operating Temperature -40 °C up to +105 °C
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Rated Current5.4 A
Inductance0.15 mH
DC Resistance42 mΩ
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Length26 mm
Width13 mm
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MountTHT 
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7447231101
SPECWE-TI Radial Leaded Wire Wound Inductor, –, –
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Product seriesWE-TI Radial Leaded Wire Wound Inductor
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Saturation Current @ 10%3.1 A
Self Resonant Frequency3.6 MHz
VersionHeat Shrinking Tube 
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Operating Temperature -40 °C up to +125 °C
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Rated Current2.6 A
Inductance0.1 mH
DC Resistance90 mΩ
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MaterialNiZn 
Length11 mm
Width11 mm
Height19 mm
MountTHT 
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860240473003
SPECWCAP-AT1H Aluminum Electrolytic Capacitors, –, –
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Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors
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Capacitance47 µF
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Pitch2.5 mm
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Endurance 5000
Ripple Current160 mA
Leakage Current11.75 µA
Dissipation Factor14 %
Diameter6.3 mm
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Rated Voltage25 V (AC)
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Length11 mm
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860240574004
SPECWCAP-AT1H Aluminum Electrolytic Capacitors, –, –
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Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors
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Capacitance47 µF
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Pitch3.5 mm
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Endurance 8000
Ripple Current240 mA
Leakage Current16.45 µA
Dissipation Factor12 %
Diameter8 mm
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Rated Voltage35 V (AC)
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Length11.5 mm
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860240475007
SPECWCAP-AT1H Aluminum Electrolytic Capacitors, –, –
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Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors
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Capacitance220 µF
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Pitch5 mm
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Endurance 10000
Ripple Current580 mA
Leakage Current55 µA
Dissipation Factor14 %
Diameter10 mm
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Rated Voltage25 V (AC)
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Length16 mm
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860080578019
SPECWCAP-ATLI Aluminum Electrolytic Capacitors, –, –
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Product seriesWCAP-ATLI Aluminum Electrolytic Capacitors
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Capacitance680 µF
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Pitch5 mm
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Endurance 5000
Ripple Current2260 mA
Leakage Current238 µA
Dissipation Factor9 %
Diameter13 mm
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Rated Voltage35 V (AC)
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Length20 mm
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61302021021
SPECWR-PHD Pin Header - Dual, –, –

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

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Product seriesWR-PHD Pin Header - Dual
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Insulation Resistance1000 MΩ
Pitch2.54 mm
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Pins20 
TypeAngled 
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Working Voltage250 V (AC)
Operating Temperature -40 °C up to +105 °C
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PackagingBag 
Rated Current3 A
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Length25.4 mm
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MountTHT 
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450301014042
SPECWS-SLTV THT Mini Slide Switch, Opposite Side Connection 10x2.5 mm, –, –
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Product seriesWS-SLTV THT Mini Slide Switch, Opposite Side Connection 10x2.5 mm
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Insulation Resistance10000 MΩ
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Operating Temperature -40 °C up to +85 °C
Operation Force800 g
SchematicSPDT 
PackagingBulk 
Rated Current0.5 A
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Rated Voltage12 V (AC)
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971100365
SPECWA-SPAIE Plastic Spacer Stud, metric, internal/ external, –, –
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Product seriesWA-SPAIE Plastic Spacer Stud, metric, internal/ external
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SW6 mm
Inner ThreadM3 
Outer ThreadM3 
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Operating Temperature -30 °C up to +110 °C
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PackagingBag 
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MaterialPolyamide 
Length10 mm
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61300211121
SPECWR-PHD Pin Header - Single, –, –
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ActiveProduction is active. Expected lifetime: >10 years.
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Product seriesWR-PHD Pin Header - Single
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Insulation Resistance1000 MΩ
Pitch2.54 mm
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Pins2 
TypeStraight 
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Working Voltage250 V (AC)
Operating Temperature -40 °C up to +105 °C
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PackagingBag 
Rated Current3 A
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Length5.08 mm
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MountTHT 
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750317576
SPECInductor, –, –
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Product series Inductor
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750317636
SPECPFC Inductor, –, –
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Product series PFC Inductor
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750316907
SPECTransformer, –, –
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Product series Transformer
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613016243121
SPECWR-PHD Socket Header - Dual, –, –
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Product seriesWR-PHD Socket Header - Dual
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Insulation Resistance1000 MΩ
Pitch2.54 mm
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Pins16 
TypeAngled 
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Working Voltage250 V (AC)
Operating Temperature -40 °C up to +105 °C
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PackagingTray 
Rated Current3 A
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Length20.82 mm
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MountTHT 
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