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Texas Instruments UCC28742 | Demoboard PMP31087
31-W offline valley-switching flyback with multiple outputs reference design
Overview
| Topology | Flyback Converter |
| Input voltage | 85-265 V |
| Switching frequency | 80 kHz |
Description
This reference design uses the UCC28742 flyback controller to generate two outputs (12 V at 2.2 A and 3.3 V at 1.5 A) from a universal input. UCC28742 uses an optical coupler to regulate the output and improve transient response. The valley-switching technique reduces switching losses and keeps the efficiency high.
Features
- Resonant-ring valley-switching operation
- Dual isolated outputs consisting of 12 V at 2.2 A and 3.3 V at 1.5 A
- Universal AC-input voltage range of 85 VAC to 265 VAC
- Output over-voltage and over-current protection
- Complete tested design with available design files and test report
Typical applications
- Industrial and Medical AC-to-DC Power Supplies, Smart Electricity Meters, Bias Supply for UPS, Server PSU, etc, Power Supply for Cable Modem, Power Supply for Cable Modem, Television, SetTop Box, and Wireless Routers
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Safety Class | dV/dt(V/µs) | DF @ 1 kHz(%) | RISO | Pitch(mm) | Packaging | ISAT,10%(A) | fres(MHz) | Version | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | DF(%) | Ø D(mm) | IR(A) | L(mH) | RDC max.(mΩ) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WCAP-FTX2 Film Capacitors, Across the mains, 220 nF | 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-CMB Common Mode Power Line Choke, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMB Common Mode Power Line Choke | – | – | – | – | – | – | – | – | – | 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 | ||||
 | 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%0.75 A | Self Resonant Frequency2.3 MHz | VersionHeat Shrinking Tube | – | – | – | – | – | Rated Current0.42 A | Inductance0.68 mH | DC Resistance2200 mΩ | – | – | – | Length9.5 mm | Width9.5 mm | Height8 mm | MountTHT | ||||
 | WCAP-AT1H Aluminum Electrolytic Capacitors, –, 33 µF | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-AT1H Aluminum Electrolytic Capacitors | Capacitance33 µF | – | – | – | – | Pitch7.5 mm | PackagingAmmopack | – | – | – | Endurance 10000 | Ripple Current870 mA | Leakage Current628 µA | Dissipation Factor20 % | Diameter18 mm | – | – | – | Rated Voltage400 V (AC) | – | – | Length21 mm | – | – | – |