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Texas Instruments UCC28780 | Demoboard UCC28780EVM-021
Using the UCC28780EVM-021, 45-W, 20-V High-Density Silicon (Si) Based, Active-Clamp Flyback Converter/Evaluation Module
Overview
| Topology | Flyback Converter |
| Input voltage | 90-264 V |
| Switching frequency | 1000 kHz |
| Output 1 | 20 V / 2.25 A |
Description
The UCC28780EVM-021 is a 45-W evaluation module (EVM) for evaluating an off-line active-clamp flyback adapter for notebook charging and other applications. The EVM meets CoC Tier 2 and DoE Level 6 efficiency requirements. It is intended for evaluation purposes and is not intended to be an end product. The UCC28780EVM-021 converts input voltage of 90-VRMS to 264-VRMS down to 20-VDC, with a 2.25-A nominal output current rating and a 160-ms limit for over-power capability. The main devices used in this design are active clamp flyback controller UCC28780, SR controller UCC24612, and Si MOSFETs.
Features
- 45-W, 20-V AC-to-DC converter using active-clamp flyback controller, Si MOSFET Power IC, and synchronous rectification
- High Efficiency (> 94%), High Power Density (> 20W/in3), Low Standby Power (40.1mW), and High Full Load Switching Frequency (291kHz)
- Exceeds EU Code of Conduct and US Department of Energy efficiency requirements
- Adaptive Burst Mode feature maintains high efficiency even at light loads
- This evaluation module is tested and orderable and includes a User's Guide
Typical applications
- High-Density AC-to-DC Adapters for Notebook, Tablet, TV, Set-Top Box and Printer
- USB Power Delivery, Direct and Fast Mobile Chargers
- USB Power Delivery, Direct and Fast Mobile Chargers
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 | Tol. C | Size | Operating Temperature | Q(%) | Ceramic Type | Fl(mm) | L(µH) | IR(A) | ISAT,10%(A) | RDC max.(Ω) | fres(MHz) | Version | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WCAP-FTX2 Film Capacitors, Across the mains, 68 nF | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTX2 Film Capacitors | Capacitance68 nF | Rated Voltage275 V (AC) | Safety ClassX2 | Rate of Voltage Rise400 V/µs | Dissipation Factor0.1 % | Insulation Resistance30 GΩ | Pitch7.5 mm | Length10 mm | Width6 mm | Height12 mm | PackagingCarton | Capacitance±10% | SizePitch 7.5 mm | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | ||||
 | WE-TI Radial Leaded Wire Wound Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | – | – | – | – | – | – | – | Length6 mm | Width6 mm | Height8.5 mm | – | – | Size5075 | Operating Temperature -40 °C up to +125 °C | – | – | – | Inductance1 µH | Rated Current8.5 A | Saturation Current @ 10%8.5 A | DC Resistance0.015 Ω | Self Resonant Frequency140 MHz | VersionHeat Shrinking Tube | ||||
| WE-TI Radial Leaded Wire Wound Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | – | – | – | – | – | – | – | Length6 mm | Width6 mm | Height8.5 mm | – | – | Size5075 | Operating Temperature -40 °C up to +125 °C | – | – | – | Inductance22 µH | Rated Current1.8 A | Saturation Current @ 10%1.7 A | DC Resistance0.13 Ω | Self Resonant Frequency15 MHz | VersionHeat Shrinking Tube | ||||
| WCAP-CSGP MLCCs 50 V(DC), –, 10 pF | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance10 pF | Rated Voltage50 V (AC) | – | – | – | Insulation Resistance10 GΩ | – | Length1 mm | Width0.5 mm | Height0.5 mm | Packaging7" Tape & Reel | Capacitance±5% | Size0402 | Operating Temperature -55 °C up to +125 °C | Q-Factor600 % | Ceramic TypeNP0 Class I | Pad Dimension0.25 mm | – | – | – | – | – | – |