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Onsemi NCP4305 | Demoboard EVBUM2341/D
Secondary Side Synchronous Rectification Driver for High Efficiency SMPS Topologies
Overview
| Topology | LLC Resonant Converter |
| Input voltage | 85-260 V |
| Output 1 | 19.5 V / 7.7 A |
| IC revision | 1 |
Description
This evaluation board user’s manual provides elementary information about a high efficiency, low no-load power consumption reference design that is targeting power laptop adapter or similar type of equipment that accepts 19.5 VDC on the input.The power supply implements PFC front stage to assure unity power factor and low THD, current mode LLC power stage to enhance transient response and secondary side synchronous rectification to maximize efficiency. This design focuses mainly on the NCP1399 current mode LLC controller description – please refer to NCP1602 and NCP4305 material to gain more information about these devices.The NCP1399 is a current mode LLC controller which means that the operating frequency of an LLC converter is not controlled via voltage (or current) controlled oscillator but is directly derived from the resonant capacitor voltage signal and actual feedback level. This control technique brings several benefits compare to traditional voltage mode controllers like improved line and load transient response and inherent out of zero voltage switching protection. The LLC controller also features built-in high voltage startup and PFC operation control pins that ease implementation of a power supply with PFC front stage and no standby power supply on board.The enhanced light lad operation of the LLC controller allows SMPS design to pass the latest no-load and light load consumption limits and still keeping output regulated with excellent transient response from no-load to full-load steps.
Features
- Wide Input Voltage Range
- Small Form Factor/High Power Density
- High Efficiency
- Low No-load Power Consumption
- Fast Startup
- X2 Capacitor Discharge Function
- Near Unity Power Factor
- Low Mains Operation Protection
- Overload Protection
- Secondary Short Circuit Protected
- Thermal Protection
- Regulated Output Under any Conditions
- Excellent Load and Line Transient Response
- Capability to Implement Off-mode for Extremely Low No-load Power Consumption
Typical applications
- High Power Density AC/DC Power Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | VR(V (AC)) | Safety Class | dV/dt(V/µs) | DF @ 1 kHz(%) | RISO | Pitch(mm) | L(mm) | W(mm) | H(mm) | Packaging | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | DF(%) | Ø D(mm) | VRMS(V) | VDC(V) | VBR(V) | IPeak(A) | Wmax(J) | PDiss(W) | VDE Approval | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-VD Disk Varistor, 230 VAC, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-VD Disk Varistor | – | – | – | – | – | – | – | Length12.5 mm | Width4.4 mm | Height16 mm | – | – | – | – | – | Diameter12.5 mm | AC Operating Voltage275 V | DC Operating Voltage350 V | (Reverse) Breakdown Voltage430 V | (Reverse) Peak Pulse Current2500 A | Energy Absorption66 J | Power Dissipation0.4 W | VDE ApprovalYes | ||||
 | WCAP-FTXX Film Capacitors, Across the mains, 330 nF | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTXX Film Capacitors | Capacitance330 nF | Rated Voltage310 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 | – | – | – | – | – | – | – | – | – | – | – | – | ||||
 | WCAP-ATG5 Aluminum Electrolytic Capacitors, –, 680 µF | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATG5 Aluminum Electrolytic Capacitors | Capacitance680 µF | Rated Voltage25 V (AC) | – | – | – | – | Pitch5 mm | Length16 mm | – | – | PackagingAmmopack | Endurance 2000 | Ripple Current520 mA | Leakage Current170 µA | Dissipation Factor14 % | Diameter10 mm | – | – | – | – | – | – | – |