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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 | Product series | C | VR (V (AC)) | Safety Class | dV/dt (V/µs) | DF @ 1 kHz (%) | RISO | Operating Temperature | 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) | Application | VDE Approval | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 890334024003 | SPEC | 8 files | WCAP-FTXX Film Capacitors | 330 nF | 310 | X2 | 260 | 0.1 | 30 GΩ | -40 °C up to +105 °C | 12.5 | 15 | 8.5 | 14 | Bulk | – | – | – | – | – | – | – | – | – | – | – | Across the mains | – | ||
 | 860020475016 | SPEC | 7 files | WCAP-ATG5 Aluminum Electrolytic Capacitors | 680 µF | 25 | – | – | – | – | -40 °C up to +105 °C | 5 | 16 | – | – | Ammopack | 2000 | 520 | 170 | 14 | 10 | – | – | – | – | – | – | – | – | ||
 | 820512711 | SPEC | 6 files | WE-VD Disk Varistor | – | – | – | – | – | – | -40 °C up to +85 °C | – | 12.5 | 4.4 | 16 | – | – | – | – | – | 12.5 | 275 | 350 | 430 | 2500 | 66 | 0.4 | 230 VAC | Yes |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 890334024003 | SPEC | |
| 860020475016 | SPEC | |
| 820512711 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Product series | C | VR (V (AC)) | Safety Class | dV/dt (V/µs) | DF @ 1 kHz (%) | RISO | Operating Temperature | 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) | Application | VDE Approval | Samples |
|---|