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Texas Instruments UCC28742 | Demoboard PMP40508
AC input, 5-V/2-A and 12-V/2.5-A dual-output flyback converter reference design
Overview
| Topology | Flyback Converter |
| Input voltage | 85-265 V |
| Switching frequency | 80-130 kHz |
| Output 1 | 5 V / 2 A |
| Output 2 | 12 V / 2.5 A |
| IC revision | 001 |
Description
This reference design is a 40-W dual-output offline converter using UCC28742, a secondary side regulator. A 5-V rail is regulated to within ±1% precision and cross regulation of 12-V rail is within -8%~+14% at 25% to 100% load. The design adopts a single-layer PCB for cost optimization. The peak efficiency is 82.68% at 115 V/60 Hz and 84.03% at 230 V/50 Hz. Power consumption at standby mode is 32.7 mW at 115 V/60 Hz and 57.51 mW at 230 V/50 Hz.
Features
- Single-layer PCB design for cost optimization
- High precision of 5-V output rail
- Peak efficiency 82.68% at 115 V/60 Hz and 84.03% at 230 V/50 Hz
- Low standby power consumption
Typical applications
- Smart Electricity Meters
- Industrial and Medical AC-to-DC Power Supplies / Bias Supply for UPS, Server PSU, etc
- AC-to-DC Power Supply for Appliances
- Power Supply for Cable Modem, Television, Set-Top Box, and Wireless Routers
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Pins | PCB/Cable/Panel | Modularity | Type | Wire Section | C | Safety Class | dV/dt(V/µs) | DF @ 1 kHz(%) | RISO | Pitch(mm) | Packaging | ISAT,10%(A) | fres(MHz) | Version | IR(A) | L(mH) | RDC max.(mΩ) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WR-TBL Series 2141 - 3.50 mm Horiz. Entry Modular, 2, Rising Cage Clamp | Simulation– | Downloads6 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-TBL Series 2141 - 3.50 mm Horiz. Entry Modular | Pins2 | PCB/Cable/PanelPCB | ModularityYes | TypeHorizontal | Wire Section 24 to 16 (AWG) 0.2 to 1 (mm²) | – | – | – | – | – | Pitch3.5 mm | PackagingBox | – | – | – | Rated Current10 A | – | – | – | – | – | Length7.05 mm | – | – | MountTHT | ||
 | WE-CMB Common Mode Power Line Choke, 4, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMB Common Mode Power Line Choke | Pins4 | – | – | – | – | – | – | – | – | – | – | – | – | – | VersionTHT | Rated Current1.5 A | Inductance20 mH | DC Resistance270 mΩ | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length23 mm | Width13.8 mm | Height25.5 mm | MountTHT | ||||
 | WCAP-FTX2 Film Capacitors, –, Across the mains | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTX2 Film Capacitors | – | – | – | – | – | Capacitance220 nF | Safety ClassX2 | Rate of Voltage Rise180 V/µs | Dissipation Factor0.1 % | Insulation Resistance30 GΩ | Pitch15 mm | PackagingCarton | – | – | – | – | – | – | Rated Voltage275 V (AC) | – | – | Length18 mm | Width6 mm | Height11.5 mm | MountBoxed THT | ||||
 | WE-TI Radial Leaded Wire Wound Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | – | – | – | – | – | – | – | – | – | – | – | – | Saturation Current @ 10%5.7 A | Self Resonant Frequency65 MHz | VersionHeat Shrinking Tube | Rated Current6.3 A | Inductance0.0022 mH | DC Resistance20 mΩ | – | – | – | Length6 mm | Width6 mm | Height8.5 mm | MountTHT |