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Onsemi NCP4305 | Demoboard ONSEC-17-038
Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies
Overview
| Topology | Buck Converter |
| IC revision | 1.0 |
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 operationof 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 FETs.
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) | λPeak B typ.(nm) | λPeak G typ.(nm) | λPeak R typ.(nm) | λDom B typ.(nm) | λDom G typ.(nm) | λDom R typ.(nm) | IV typ.(mcd) | IV B typ.(mcd) | IV G typ.(mcd) | IV R typ.(mcd) | VF typ.(V) | VF B typ.(V) | VF G typ.(V) | VF R typ.(V) | Chip Technology | 2θ50% typ.(°) | C | VR(V (AC)) | Safety Class | dV/dt(V/µs) | DF @ 1 kHz(%) | RISO | Pitch(mm) | L(mm) | W(mm) | H(mm) | Packaging | L(µH) | IR(A) | ISAT,10%(A) | RDC max.(mΩ) | fres(MHz) | Version | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | DF(%) | Ø D(mm) | Interface Type | Type | Gender | Pins | Mount | PCB Thickness(mm) | Working Voltage(V (DC)) | G(mm) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WL-SMCW SMT Mono-color Chip LED Waterclear, 470 nm, Blue | Downloads28 files RAY files
| Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear | Dominant Wavelength [typ.]470 nm | Emitting ColorBlue | Peak Wavelength [typ.]465 nm | – | – | – | – | – | – | Luminous Intensity [typ.]145 mcd | – | – | – | Forward Voltage [typ.]3.2 V | – | – | – | Chip TechnologyInGaN | Viewing Angle Phi 0° [typ.]140 ° | – | – | – | – | – | – | – | Length1.6 mm | Width0.8 mm | Height0.7 mm | PackagingTape and Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | MountSMT | – | – | – | Operating Temperature -40 °C up to +85 °C | |||
 | WCAP-FTX2 Film Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTX2 Film Capacitors | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Capacitance100 nF | Rated Voltage275 V (AC) | Safety ClassX2 | Rate of Voltage Rise300 V/µs | Dissipation Factor0.1 % | Insulation Resistance30 GΩ | Pitch10 mm | Length13 mm | Width7 mm | Height13 mm | PackagingBulk | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | MountBoxed THT | – | – | Pin length18 mm | Operating Temperature -40 °C up to +105 °C | ||||
| WCAP-FTX2 Film Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTX2 Film Capacitors | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Capacitance330 nF | Rated Voltage275 V (AC) | Safety ClassX2 | Rate of Voltage Rise260 V/µs | Dissipation Factor0.1 % | Insulation Resistance30 GΩ | Pitch12.5 mm | Length15 mm | Width8.5 mm | Height14 mm | PackagingBulk | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | MountBoxed THT | – | – | Pin length18 mm | Operating Temperature -40 °C up to +105 °C | ||||
 | 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 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Length11 mm | Width11 mm | Height19 mm | – | Inductance100 µH | Rated Current2.6 A | Saturation Current @ 10%3.1 A | DC Resistance90 mΩ | Self Resonant Frequency3.6 MHz | VersionHeat Shrinking Tube | – | – | – | – | – | – | – | – | – | MountTHT | – | – | – | Operating Temperature -40 °C up to +125 °C | |||
 | WL-SFTW SMT Full-color TOP LED Waterclear, –, Red & Green & Blue | Simulation– | Downloads26 files RAY files
| Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWL-SFTW SMT Full-color TOP LED Waterclear | – | Emitting ColorRed & Green & Blue | – | Peak Wavelength (Blue) [typ.]465 nm | Peak Wavelength (Green) [typ.]515 nm | Peak Wavelength (Red) [typ.]635 nm | Dominant Wavelength (Blue) [typ.]470 nm | Dominant Wavelength (Green) [typ.]520 nm | Dominant Wavelength (Red) [typ.]625 nm | – | Luminous Intensity (Blue) [typ.]230 mcd | Luminous Intensity (Green) [typ.]950 mcd | Luminous Intensity (Red) [typ.]270 mcd | – | Forward Voltage (Blue) [typ.]3.2 V | Forward Voltage (Green) [typ.]3.2 V | Forward Voltage (Red) [typ.]2 V | Chip TechnologyAlInGaP + InGaN | Viewing Angle Phi 0° [typ.]120 ° | – | – | – | – | – | – | – | Length3.5 mm | Width2.8 mm | Height1.9 mm | PackagingTape and Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | MountSMT | – | – | – | Operating Temperature -40 °C up to +85 °C | ||
 | WCAP-AT1H Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Capacitance47 µF | Rated Voltage25 V (AC) | – | – | – | – | Pitch2.5 mm | Length11 mm | – | – | PackagingAmmopack | – | – | – | – | – | – | Endurance 5000 | Ripple Current160 mA | Leakage Current11.75 µA | Dissipation Factor14 % | Diameter6.3 mm | – | – | – | – | – | – | – | – | – | ||||
| WCAP-AT1H Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Capacitance47 µF | Rated Voltage35 V (AC) | – | – | – | – | Pitch3.5 mm | Length11.5 mm | – | – | PackagingAmmopack | – | – | – | – | – | – | Endurance 8000 | Ripple Current240 mA | Leakage Current16.45 µA | Dissipation Factor12 % | Diameter8 mm | – | – | – | – | – | – | – | – | – | ||||
| WCAP-AT1H Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Capacitance220 µF | Rated Voltage25 V (AC) | – | – | – | – | Pitch5 mm | Length16 mm | – | – | PackagingAmmopack | – | – | – | – | – | – | Endurance 10000 | Ripple Current580 mA | Leakage Current55 µA | Dissipation Factor14 % | Diameter10 mm | – | – | – | – | – | – | – | – | – | ||||
 | WCAP-ATLI Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATLI Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Capacitance680 µF | Rated Voltage35 V (AC) | – | – | – | – | Pitch5 mm | Length20 mm | – | – | PackagingAmmopack | – | – | – | – | – | – | Endurance 5000 | Ripple Current2260 mA | Leakage Current238 µA | Dissipation Factor9 % | Diameter13 mm | – | – | – | – | – | – | – | – | – | ||||
 | WR-USB Standard Connectors, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-USB Standard Connectors | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Insulation Resistance100 MΩ | – | – | – | – | PackagingTray | – | Rated Current5 A | – | – | – | – | – | – | – | – | – | Interface TypeType A | TypeHorizontal | GenderReceptacle | Pins9 | MountTHR | – | Working Voltage20 V (DC) | – | Operating Temperature -20 °C up to +85 °C | |||
 | WR-USB Type C Connectors, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-USB Type C Connectors | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Insulation Resistance1000 MΩ | – | – | – | – | PackagingTape and Reel | – | Rated Current5 A | – | – | – | – | – | – | – | – | – | Interface TypeType C | TypeHorizontal | GenderReceptacle | Pins24 | MountTHR | PCB Thickness1.6 mm | Working Voltage48 V (DC) | Pin length1.9 mm | Operating Temperature -40 °C up to +105 °C | |||
 | 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 | Length5.08 mm | – | – | PackagingBag | – | Rated Current3 A | – | – | – | – | – | – | – | – | – | – | TypeStraight | GenderPin Header | Pins2 | MountTHT | – | Working Voltage250 V (DC) | – | Operating Temperature -40 °C up to +105 °C | |||
 | 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 | Length7.62 mm | – | – | PackagingBag | – | Rated Current3 A | – | – | – | – | – | – | – | – | – | – | TypeStraight | GenderPin Header | Pins3 | MountTHT | – | Working Voltage250 V (DC) | – | Operating Temperature -40 °C up to +105 °C | |||
 | 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 | Length10.16 mm | – | – | PackagingBag | – | Rated Current3 A | – | – | – | – | – | – | – | – | – | – | TypeStraight | GenderPin Header | Pins4 | MountTHT | – | Working Voltage250 V (DC) | – | Operating Temperature -40 °C up to +105 °C | |||
750317576 | Inductor, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Inductor | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |