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Texas Instruments UCC28742 | Demoboard TIDA-010239
High-Efficiency Flyback Controller with 1% Output regulation accuracy
Overview
| Topology | Flyback Converter |
| Input voltage | 85-460 V |
| Switching frequency | 200-80 kHz |
| Output 1 | 14 V |
| Output 2 | -14 V |
| Output 3 | 12 V / 2.2 A |
| IC revision | C |
Description
The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-side regulated PWM controller for efficient AC-to-DC power supplies. It is an isolated-flyback power-supply controller that provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. This device processes information from opto-coupled feedback and an auxiliary flyback winding for high-performance control of output voltage and current.The UCC28742 employs advanced control algorithms to achieve high operating efficiency and performance. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. A minimum switching frequency of 200 Hz facilitates the achievement of low no-load input power.This EVM includes an on-board MSP430, MSP430FR2355, which is used to interface with the MCT8316ZTEVM GUI.
Features
Opto-Coupled Feedback Enables up to 1% RegulationAccurate Current Limit with Overload Timeout Protection and Delayed Hiccup ResponseResonant-Ring Valley-Switching Operation for Highest Overall Efficiency80-kHz Maximum Switching FrequencyFrequency Dithering to Ease EMI ComplianceClamped Gate-Drive Output for MOSFETUltra-Low Start-Up Current and Large VDD HysteresisHigh Value Start-Up ResistorLow Bias CapacitanceFault ProtectionsInput Low LineOutput Over-VoltageOver-CurrentShort-CircuitSOT23-6 PackageCreate a Custom Design Using the UCC28742 with the WEBENCH® Power DesignerSupercapacitor backup supplying up to 7.5 W for three seconds during energy storage release (AC mains failing)DRV8220 current controller to drive high-current relays and contactors for thermal protection, RCD AC and DC detection, and plug lock controlIsolated line voltage sensing using the ISO1212 digital-input receiver for welded relay and contactor detectionTight output voltage regulation (< ±5%) of LDOs and the high slew rate of the TLV1805 device for control pilot interface
Typical applications
- L1 Residential Chargers
- EV charging station power module
- L2 Commercial Chargers
- DC fast charging station
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | λDom typ.(nm) | Emitting Color | λPeak typ.(nm) | IV typ.(mcd) | VF typ.(V) | Chip Technology | 2θ50% typ.(°) | C | VR 2(V (DC)) | dV/dt(V/µs) | DF @ 1 kHz(%) | RISO | Pitch(mm) | Packaging | Tol. C | Size | Qmin. | DF(%) | Ceramic Type | Fl(mm) | Operating Temperature | Q(%) | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | Ø D(mm) | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(Ω) | Type | IR(mA) | L1(mH) | RDC max.(Ω) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WL-SMCW SMT Mono-color Chip LED Waterclear, 525 nm, Green | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear | Dominant Wavelength [typ.]525 nm | Emitting ColorGreen | Peak Wavelength [typ.]515 nm | Luminous Intensity [typ.]450 mcd | Forward Voltage [typ.]3.2 V | Chip TechnologyInGaN | Viewing Angle Phi 0° [typ.]140 ° | – | – | – | – | – | – | PackagingTape and Reel | – | Size1206 | – | – | – | – | Operating Temperature -40 °C up to +85 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Length3.2 mm | Width1.6 mm | Height0.68 mm | MountSMT | ||||
 | WE-CBF SMT EMI Suppression Ferrite Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Size0805 | – | – | – | Pad Dimension0.5 mm | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | Impedance @ 100 MHz1000 Ω | Maximum Impedance1050 Ω | Maximum Impedance150 MHz | Rated Current 2900 mA | DC Resistance0.45 Ω | TypeWide Band | Rated Current200 mA | – | DC Resistance [1]0.45 Ω | – | – | – | Length2 mm | Width1.2 mm | Height0.9 mm | MountSMT | ||||
 | WE-LF Common Mode Power Line Choke, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LF Common Mode Power Line Choke | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | SizeSV | – | – | – | – | Operating Temperature -40 °C up to +125 °C | – | – | – | – | – | – | – | – | – | DC Resistance0.3 Ω | – | Rated Current1000 mA | Inductance [1]6.8 mH | DC Resistance [1]0.3 Ω | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length18 mm | Width12.8 mm | Height19.8 mm | MountTHT | ||||
 | WCAP-ATG8 Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATG8 Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | Capacitance100 µF | – | – | – | – | Pitch2.5 mm | PackagingAmmopack | Capacitance±20% | – | – | Dissipation Factor14 % | – | – | – | – | Endurance 2000 | Ripple Current209 mA | Leakage Current25 µA | Diameter6.3 mm | – | – | – | – | – | – | – | – | – | Rated Voltage25 V (AC) | – | – | Length11 mm | – | – | – | ||||
 | WCAP-ATG5 Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATG5 Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | Capacitance68 µF | – | – | – | – | Pitch7.5 mm | PackagingAmmopack | Capacitance±20% | – | – | Dissipation Factor15 % | – | – | – | – | Endurance 2000 | Ripple Current410 mA | Leakage Current816 µA | Diameter16 mm | – | – | – | – | – | – | – | – | – | Rated Voltage400 V (AC) | – | – | Length25 mm | – | – | – | ||||
 | WCAP-ATUL Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATUL Aluminum Electrolytic Capacitors | – | – | – | – | – | – | – | Capacitance680 µF | – | – | – | – | Pitch5 mm | PackagingAmmopack | Capacitance±20% | – | – | Dissipation Factor14 % | – | – | – | – | Endurance 7000 | Ripple Current1400 mA | Leakage Current170 µA | Diameter10 mm | – | – | – | – | – | – | – | – | – | Rated Voltage25 V (AC) | – | – | Length20 mm | – | – | – | ||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | – | – | Capacitance100 pF | – | – | – | Insulation Resistance10 GΩ | – | Packaging7" Tape & Reel | Capacitance±5% | Size0603 | – | – | Ceramic TypeNP0 Class I | Pad Dimension0.4 mm | Operating Temperature -55 °C up to +125 °C | Q-Factor1000 % | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage50 V (AC) | – | – | Length1.6 mm | Width0.8 mm | Height0.8 mm | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | – | – | Capacitance2.2 nF | – | – | – | Insulation Resistance10 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Size0603 | Q-Factor [1]600 | Dissipation Factor2.5 % | Ceramic TypeX7R Class II | Pad Dimension0.4 mm | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage50 V (AC) | – | – | Length1.6 mm | Width0.8 mm | Height0.8 mm | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | – | – | Capacitance47 nF | – | – | – | Insulation Resistance10 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Size0603 | Q-Factor [1]600 | Dissipation Factor3 % | Ceramic TypeX7R Class II | Pad Dimension0.4 mm | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage50 V (AC) | – | – | Length1.6 mm | Width0.8 mm | Height0.8 mm | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | – | – | Capacitance100 nF | – | – | – | Insulation Resistance5 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Size0603 | Q-Factor [1]600 | Dissipation Factor3 % | Ceramic TypeX7R Class II | Pad Dimension0.4 mm | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage50 V (AC) | – | – | Length1.6 mm | Width0.8 mm | Height0.8 mm | – | |||||
| WCAP-CSGP MLCCs 25 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 25 V(DC) | – | – | – | – | – | – | – | Capacitance4.7 µF | – | – | – | Insulation Resistance0.02 GΩ | – | Packaging7" Tape & Reel | Capacitance±20% | Size0805 | Q-Factor [1]600 | Dissipation Factor10 % | Ceramic TypeX5R Class II | Pad Dimension0.5 mm | Operating Temperature -55 °C up to +85 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage25 V (AC) | – | – | Length2 mm | Width1.25 mm | Height1.25 mm | – | |||||
 | WCAP-CSMH Mid and High Voltage, –, – | Downloads8 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSMH Mid and High Voltage | – | – | – | – | – | – | – | Capacitance1 nF | – | – | – | Insulation Resistance10 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Size0805 | – | Dissipation Factor2.5 % | Ceramic TypeX7R Class II | Pad Dimension0.5 mm | Operating Temperature -55 °C up to +125 °C | Q-Factor600 % | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage250 V (AC) | – | – | Length2 mm | Width1.25 mm | Height0.8 mm | – | |||
 | WCAP-FTBE Film Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTBE Film Capacitors | – | – | – | – | – | – | – | Capacitance100 nF | Rated Voltage 2800 V (DC) | Rate of Voltage Rise44 V/µs | Dissipation Factor1 % | Insulation Resistance9 GΩ | Pitch15 mm | PackagingCarton | Capacitance±10% | SizePitch 15 mm | – | – | – | – | Operating Temperature -40 °C up to +85 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage1000 V (AC) | – | – | Length18 mm | Width8.5 mm | Height15 mm | – | ||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | – | – | Capacitance10 µF | – | – | – | Insulation Resistance0.005 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Size1206 | Q-Factor [1]600 | Dissipation Factor10 % | Ceramic TypeX5R Class II | Pad Dimension0.6 mm | Operating Temperature -55 °C up to +85 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage50 V (AC) | – | – | Length3.2 mm | Width1.6 mm | Height1.6 mm | – | |||||
| WCAP-CSGP MLCCs 25 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 25 V(DC) | – | – | – | – | – | – | – | Capacitance22 µF | – | – | – | Insulation Resistance0.005 GΩ | – | Packaging7" Tape & Reel | Capacitance±10% | Size1210 | Q-Factor [1]600 | Dissipation Factor10 % | Ceramic TypeX5R Class II | Pad Dimension0.6 mm | Operating Temperature -55 °C up to +85 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Rated Voltage25 V (AC) | – | – | Length3.2 mm | Width2.5 mm | Height2.5 mm | – | |||||
750320029 | Offline Transformer, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Offline Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |