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Overview
| Topology | Flyback Converter |
| Input voltage | 85-265 V |
| Output 1 | 20 V / 3.25 A |
| IC revision | C |
Description
This reference design is a low-cost, high-density USB adapter that uses the UCC28782 active-clamp flyback controller and UCC5304 isolated driver in a ZVS-flyback topology. The maximum power rating is 65 W at 20-V output but is adjustable for 20-V/15-V/9-V/5-V output voltages and 3 A. This design reaches a peak efficiency of 93.4%. The average efficiency and standby power levels are designed to meet DoE level VI and CoC Tier 2 limits. The compact design has dimensions of 44 mm by 54 mm by 20mm (48cc open frame).
Features
- Compact size of 44 mm by 54mm by 20 mm (48 cc open frame)
- High efficiency, 93.4% peak
- EMI data provided in test report, below CISPR32 limits
- Supports variable output voltage 5 V to 20 V
- Designed to meet efficiency and standby requirements of DoE Level VI and CoC Tier 2
Typical applications
- Notebook PC power adapter design
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 | Interface Type | Type | Gender | Pins | Mount | PCB Thickness(mm) | Working Voltage(V (DC)) | L(µH) | IR(A) | RDC max.(Ω) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WCAP-FTX2 Film Capacitors, Across the mains, 330 nF | 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 | – | – | – | – | – | ||||
 | WR-USB Type C Connectors, USB 3.1, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-USB Type C Connectors | – | – | – | – | – | Insulation Resistance1000 MΩ | – | – | – | – | PackagingTape and Reel | Interface TypeType C | TypeHorizontal | GenderReceptacle | Pins24 | MountTHR | PCB Thickness1.6 mm | Working Voltage48 V (DC) | – | Rated Current5 A | – | |||
 | WE-FI Leaded Toroidal Line Choke, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-FI Leaded Toroidal Line Choke | – | – | – | – | – | – | – | Length10 mm | Width6.6 mm | – | – | – | – | – | – | MountTHT | – | – | Inductance32 µH | Rated Current2.6 A | DC Resistance0.045 Ω |