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Onsemi NCP4305D | Demoboard ONSEC-18-022
Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies
Overview
| Topology | Flyback 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
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | λDom typ.(nm) | Emitting Color | λPeak typ.(nm) | IV typ.(mcd) | VF typ.(V) | Chip Technology | 2θ50% typ.(°) | 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 | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WL-SMSW SMT Mono-color Side View Waterclear, 470 nm, Blue | Status Activei| Production is active. Expected lifetime: >10 years. | 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 ° | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Operating Temperature -40 °C up to +85 °C | – | – | PackagingTape and Reel | – | – | – | – | – | – | Length3.2 mm | Width1.5 mm | Height1 mm | MountSMT | – | – | – | – | – | Power Dissipation95 mW | – | ||||
 | WE-CMBNC Common Mode Power Line Choke Nanocrystalline, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMBNC Common Mode Power Line Choke Nanocrystalline | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | VersionTHT | – | – | – | – | – | – | – | – | Pins4 | – | Pin length5 mm | – | Operating Temperature -55 °C up to +125 °C | – | – | – | 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 | – | – | – | – | – | – | VDE Approval40048238 | ||||
 | WE-CMB Common Mode Power Line Choke, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMB Common Mode Power Line Choke | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | VersionTHT | – | – | – | – | – | – | – | – | Pins4 | – | Pin length3 mm | – | Operating Temperature -40 °C up to +125 °C | – | – | – | 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 | – | – | – | – | – | – | VDE Approval40042670 | ||||
 | WE-VD Disk Varistor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-VD Disk Varistor | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | VersionTHT | – | – | – | – | – | – | – | Diameter12.5 mm | – | – | – | – | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | 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 | ||||
 | WCAP-FTX2 Film Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTX2 Film Capacitors | – | – | – | – | – | – | – | Capacitance100 nF | Safety ClassX2 | Rate of Voltage Rise300 V/µs | Dissipation Factor0.1 % | Insulation Resistance30 GΩ | Pitch10 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | Pin length18 mm | – | Operating Temperature -40 °C up to +105 °C | – | – | PackagingBulk | – | – | – | Rated Voltage275 V (AC) | – | – | Length13 mm | Width7 mm | Height13 mm | MountBoxed THT | – | – | – | – | – | – | – | ||||
| WCAP-FTX2 Film Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTX2 Film Capacitors | – | – | – | – | – | – | – | Capacitance330 nF | Safety ClassX2 | Rate of Voltage Rise260 V/µs | Dissipation Factor0.1 % | Insulation Resistance30 GΩ | Pitch12.5 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | Pin length18 mm | – | Operating Temperature -40 °C up to +105 °C | – | – | PackagingBulk | – | – | – | Rated Voltage275 V (AC) | – | – | Length15 mm | Width8.5 mm | Height14 mm | MountBoxed THT | – | – | – | – | – | – | – | ||||
 | WE-FI Leaded Toroidal Line Choke, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-FI Leaded Toroidal Line Choke | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Pin length15 mm | – | Operating Temperature -40 °C up to +105 °C | – | – | – | Rated Current5.4 A | Inductance0.15 mH | DC Resistance42 mΩ | – | – | – | Length26 mm | Width13 mm | – | MountTHT | – | – | – | – | – | – | – | |||
 | WE-TI Radial Leaded Wire Wound Inductor, –, – | Downloads15 files EDA models: Components ZIP
Download all 15 files as zip archive | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | – | – | – | – | – | – | – | – | – | – | – | – | – | Saturation Current @ 10%3.1 A | Self Resonant Frequency3.6 MHz | VersionHeat Shrinking Tube | – | – | – | – | – | – | – | – | – | – | – | – | Operating Temperature -40 °C up to +125 °C | – | – | – | Rated Current2.6 A | Inductance0.1 mH | DC Resistance90 mΩ | – | – | MaterialNiZn | Length11 mm | Width11 mm | Height19 mm | MountTHT | – | – | – | – | – | – | – | |||
 | WCAP-AT1H Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | Capacitance47 µF | – | – | – | – | Pitch2.5 mm | – | – | – | – | – | – | Endurance 5000 | Ripple Current160 mA | Leakage Current11.75 µA | Dissipation Factor14 % | Diameter6.3 mm | – | – | – | – | – | – | – | PackagingAmmopack | – | – | – | Rated Voltage25 V (AC) | – | – | Length11 mm | – | – | – | – | – | – | – | – | – | – | ||||
| WCAP-AT1H Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | Capacitance47 µF | – | – | – | – | Pitch3.5 mm | – | – | – | – | – | – | Endurance 8000 | Ripple Current240 mA | Leakage Current16.45 µA | Dissipation Factor12 % | Diameter8 mm | – | – | – | – | – | – | – | PackagingAmmopack | – | – | – | Rated Voltage35 V (AC) | – | – | Length11.5 mm | – | – | – | – | – | – | – | – | – | – | ||||
| WCAP-AT1H Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | Capacitance220 µF | – | – | – | – | Pitch5 mm | – | – | – | – | – | – | Endurance 10000 | Ripple Current580 mA | Leakage Current55 µA | Dissipation Factor14 % | Diameter10 mm | – | – | – | – | – | – | – | PackagingAmmopack | – | – | – | Rated Voltage25 V (AC) | – | – | Length16 mm | – | – | – | – | – | – | – | – | – | – | ||||
 | WCAP-ATLI Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATLI Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | Capacitance680 µF | – | – | – | – | Pitch5 mm | – | – | – | – | – | – | Endurance 5000 | Ripple Current2260 mA | Leakage Current238 µA | Dissipation Factor9 % | Diameter13 mm | – | – | – | – | – | – | – | PackagingAmmopack | – | – | – | Rated Voltage35 V (AC) | – | – | Length20 mm | – | – | – | – | – | – | – | – | – | – | ||||
 | Simulation– | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header - Dual | – | – | – | – | – | – | – | – | – | – | – | Insulation Resistance1000 MΩ | Pitch2.54 mm | – | – | – | – | – | – | – | – | – | – | – | Pins20 | TypeAngled | – | Working Voltage250 V (AC) | Operating Temperature -40 °C up to +105 °C | – | – | PackagingBag | Rated Current3 A | – | – | – | – | – | Length25.4 mm | – | – | MountTHT | – | – | – | – | – | – | – | |||
 | WS-SLTV THT Mini Slide Switch, Opposite Side Connection 10x2.5 mm, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | – | – | – | – | – | – | – | – | – | – | – | Insulation Resistance10000 MΩ | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Operating Temperature -40 °C up to +85 °C | Operation Force800 g | SchematicSPDT | PackagingBulk | Rated Current0.5 A | – | – | Rated Voltage12 V (AC) | – | – | – | – | – | – | – | – | – | – | – | – | – | ||||
 | WA-SPAIE Plastic Spacer Stud, metric, internal/ external, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWA-SPAIE Plastic Spacer Stud, metric, internal/ external | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | SW6 mm | Inner ThreadM3 | Outer ThreadM3 | – | – | – | – | – | – | – | – | – | Operating Temperature -30 °C up to +110 °C | – | – | PackagingBag | – | – | – | – | – | MaterialPolyamide | Length10 mm | – | – | – | – | – | – | – | – | – | – | |||
 | WR-PHD Pin Header - Single, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header - Single | – | – | – | – | – | – | – | – | – | – | – | Insulation Resistance1000 MΩ | Pitch2.54 mm | – | – | – | – | – | – | – | – | – | – | – | Pins2 | TypeStraight | – | Working Voltage250 V (AC) | Operating Temperature -40 °C up to +105 °C | – | – | PackagingBag | Rated Current3 A | – | – | – | – | – | Length5.08 mm | – | – | MountTHT | – | – | – | – | – | – | – | |||
750317576 | Inductor, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Inductor | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
750317636 | PFC Inductor, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series PFC Inductor | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
750316907 | Transformer, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | ||
 | WR-PHD Socket Header - Dual, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Socket Header - Dual | – | – | – | – | – | – | – | – | – | – | – | Insulation Resistance1000 MΩ | Pitch2.54 mm | – | – | – | – | – | – | – | – | – | – | – | Pins16 | TypeAngled | – | Working Voltage250 V (AC) | Operating Temperature -40 °C up to +105 °C | – | – | PackagingTray | Rated Current3 A | – | – | – | – | – | Length20.82 mm | – | – | MountTHT | – | – | – | – | – | – | – |