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Texas Instruments UCC28750 | Demoboard PMP31376
Universal AC input to 9V-26.5V, 100W battery charger reference design
Overview
| Topology | Flyback Converter |
| Input voltage | 90-264 V |
| Output 1 | 26.5 V / 4 A |
| IC revision | NOVEMBER 2025 |
Description
This reference design is an offline isolated flyback. The AC-DC power stage is based on the UCC28750 fixed-frequency peak current mode controller, which features continuous conduction mode (CCM) and discontinuous conduction mode (DCM) modulation, as well as secondary-side regulation. Frequency foldback and burst mode improve light-load efficiency while frequency dithering reduces electromagnetic interference (EMI) signature. The controller provides several protection features, including over-under voltage lockout, Vout overvoltage, overpower, and short-circuit protections
Features
Can charge two lead-acid batteries in series
- Provides independent constant voltage andconstant current feedback
- No-load power consumption: 63.2mW at 115VAC,9V output and 122mW at 230VA
Typical applications
- Battery charger
- Mains powered tools
- Battery Pack: cordless power tool
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | Pins | PCB/Cable/Panel | Modularity | Type | Wire Section | C | Tol. C | VR(V (AC)) | Size | Operating Temperature | Safety Class | VIMP(V (DC)) | DF(%) | RISO | Ceramic Type | L(mm) | W(mm) | H(mm) | Fl(mm) | Packaging | dV/dt(V/µs) | DF @ 1 kHz(%) | Pitch(mm) | Q(%) | L(µH) | IR(A) | ISAT,10%(A) | RDC max.(mΩ) | fres(MHz) | Version | Endurance(h) | IRIPPLE(mA) | ILeak(µA) | Ø D(mm) | Z(mΩ) | R | Tol. R | PRated(W) | TCR(ppm/ °C) | TCR(ppm/ °C) | VE(V) | Technical Reference | VDC(V) | VBR(V) | IPeak(A) | PDiss(W) | VClamp max.(V) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WR-TBL Series 2365 - 5.08 mm Horiz. Entry w. Rising Cage Clamp, 2, Rising Cage Clamp | Simulation– | Downloads6 files | Status Activei| Production is active. Expected lifetime: >10 years. | Pins2 | PCB/Cable/PanelPCB | ModularityYes | TypeHorizontal | Wire Section 12 to 30 (AWG) 3.31 to 0.0509 (mm²) | – | – | – | – | Operating Temperature -30 °C up to +120 °C | – | – | – | – | – | Length10.16 mm | – | – | – | PackagingBox | – | – | Pitch5.08 mm | – | – | Rated Current20 A | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||
 | WCAP-FTX2 Film Capacitors, –, Across the mains | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-FTX2 Film Capacitors | – | – | – | – | – | Capacitance220 nF | Capacitance±10% | Rated Voltage275 V (AC) | SizePitch 10 mm | Operating Temperature -40 °C up to +105 °C | Safety ClassX2 | – | – | Insulation Resistance30 GΩ | – | Length13 mm | Width8 mm | Height14 mm | – | PackagingCarton | Rate of Voltage Rise300 V/µs | Dissipation Factor0.1 % | Pitch10 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Technical ReferenceMX2P010224K275ACPP46004 | – | – | – | – | – | ||||
 | WE-TI Radial Leaded Wire Wound Inductor, –, – | Downloads15 files EDA models: Components ZIP
Download all 15 files as zip archive | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | – | – | – | – | – | – | – | – | Size1018 | Operating Temperature -40 °C up to +125 °C | – | – | – | – | – | Length11 mm | Width11 mm | Height19 mm | – | – | – | – | – | – | Inductance100 µH | Rated Current2.6 A | Saturation Current @ 10%3.1 A | DC Resistance90 mΩ | Self Resonant Frequency3.6 MHz | VersionHeat Shrinking Tube | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |||
 | WCAP-ATG5 Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ATG5 Aluminum Electrolytic Capacitors | – | – | – | – | – | Capacitance68 µF | Capacitance±20% | Rated Voltage400 V (AC) | – | – | – | – | Dissipation Factor15 % | – | – | Length25 mm | – | – | – | PackagingAmmopack | – | – | Pitch7.5 mm | – | – | – | – | – | – | – | Endurance 2000 | Ripple Current410 mA | Leakage Current816 µA | Diameter16 mm | – | – | – | – | – | – | – | Technical ReferenceATJK250680M400DSPAEB000 | – | – | – | – | – | ||||
 | WCAP-ASLI Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ASLI Aluminum Electrolytic Capacitors | – | – | – | – | – | Capacitance47 µF | Capacitance±20% | Rated Voltage50 V (AC) | Size6.3 x 7.7 | Operating Temperature -55 °C up to +105 °C | – | – | Dissipation Factor12 % | Insulation Resistance2.12766 MΩ | – | Length7.7 mm | Width6.6 mm | – | – | Packaging15" Tape & Reel | – | – | – | – | – | – | – | – | – | VersionSMT | Endurance 2000 | Ripple Current230 mA | Leakage Current23.5 µA | Diameter6.3 mm | Impedance700 mΩ | – | – | – | – | – | – | Technical ReferenceASED077470M050DVCTCB000 | – | – | – | – | – | ||||
 | WCAP-ASLL Aluminum Electrolytic Capacitors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-ASLL Aluminum Electrolytic Capacitors | – | – | – | – | – | Capacitance10 µF | Capacitance±20% | Rated Voltage50 V (AC) | Size6.3 x 5.5 | Operating Temperature -55 °C up to +105 °C | – | – | Dissipation Factor12 % | Insulation Resistance10 MΩ | – | Length5.5 mm | Width6.6 mm | – | – | Packaging15" Tape & Reel | – | – | – | – | – | – | – | – | – | VersionSMT | Endurance 2000 | Ripple Current165 mA | Leakage Current5 µA | Diameter6.3 mm | Impedance1400 mΩ | – | – | – | – | – | – | Technical ReferenceASED055100M050DVCTBB000 | – | – | – | – | – | ||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | Capacitance10 pF | Capacitance±5% | Rated Voltage50 V (AC) | Size0603 | Operating Temperature -55 °C up to +125 °C | – | – | – | Insulation Resistance10 GΩ | Ceramic TypeNP0 Class I | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | Q-Factor600 % | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Technical ReferenceNP00603100J050DFCT10000 | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | Capacitance220 pF | Capacitance±5% | Rated Voltage50 V (AC) | Size0603 | Operating Temperature -55 °C up to +125 °C | – | – | – | Insulation Resistance10 GΩ | Ceramic TypeNP0 Class I | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | Q-Factor1000 % | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Technical ReferenceNP00603221J050DFCT10000 | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 25 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 25 V(DC) | – | – | – | – | – | Capacitance150 nF | Capacitance±10% | Rated Voltage25 V (AC) | Size0603 | Operating Temperature -55 °C up to +125 °C | – | – | Dissipation Factor3.5 % | Insulation Resistance3.3 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Technical ReferenceX7R0603154K025DFCT10000 | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | Capacitance10 nF | Capacitance±10% | Rated Voltage50 V (AC) | Size0603 | Operating Temperature -55 °C up to +125 °C | – | – | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Technical ReferenceX7R0603103K050DFCT10000 | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | Capacitance100 nF | Capacitance±10% | Rated Voltage50 V (AC) | Size0603 | Operating Temperature -55 °C up to +125 °C | – | – | Dissipation Factor3 % | Insulation Resistance5 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Technical ReferenceX7R0603104K050DFCT10000 | – | – | – | – | – | |||||
 | WE-TVSP Power TVS Diode, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TVSP Power TVS Diode | – | – | – | – | – | – | – | – | SizeDO-214AB | Operating Temperature -65 °C up to +150 °C | – | – | – | – | – | Length6.86 mm | Width5.91 mm | Height2.5 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Leakage Current2 µA | – | – | – | – | – | – | – | – | Technical ReferenceSMDJ100A | DC Operating Voltage100 V | (Reverse) Breakdown Voltage117 V | (Reverse) Peak Pulse Current18.5 A | Power Dissipation3000 W | Clamping Voltage [max.]162 V | |||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | Capacitance10 µF | Capacitance±10% | Rated Voltage50 V (AC) | Size1210 | Operating Temperature -55 °C up to +125 °C | – | – | Dissipation Factor10 % | Insulation Resistance0.01 GΩ | Ceramic TypeX7R Class II | Length3.2 mm | Width2.5 mm | Height2.5 mm | Pad Dimension0.6 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Technical ReferenceX7R1210106K050DFCT10000 | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | Capacitance1 µF | Capacitance±10% | Rated Voltage50 V (AC) | Size0805 | Operating Temperature -55 °C up to +125 °C | – | – | Dissipation Factor10 % | Insulation Resistance0.1 GΩ | Ceramic TypeX7R Class II | Length2 mm | Width1.25 mm | Height1.25 mm | Pad Dimension0.5 mm | Packaging13" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Technical ReferenceX7R0805105K050DFCT20000 | – | – | – | – | – | |||||
 | WCAP-CSSA Interference Suppression, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSSA Interference Suppression | – | – | – | – | – | Capacitance2.2 nF | Capacitance±10% | Rated Voltage250 V (AC) | Size2211 | Operating Temperature -55 °C up to +125 °C | Safety ClassX1 / Y2 | Impulse Voltage5000 V (DC) | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Length5.7 mm | Width2.8 mm | Height2.5 mm | Pad Dimension0.6 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Technical ReferenceX7R2211222KE00IFCT1B000 | – | – | – | – | – | ||||
| WCAP-CSGP MLCCs 50 V(DC), –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | Capacitance1 µF | Capacitance±10% | Rated Voltage50 V (AC) | Size0603 | Operating Temperature -55 °C up to +125 °C | – | – | Dissipation Factor10 % | Insulation Resistance0.5 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.35 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Technical ReferenceX7R0603105K050DFCT10000 | – | – | – | – | – | |||||
 | WRIS-RSKS Thick Film Resistors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWRIS-RSKS Thick Film Resistors | – | – | – | – | – | – | – | – | Size0603 | Operating Temperature -55 °C up to +155 °C | – | – | – | – | – | Length1.6 mm | Width0.8 mm | Height0.45 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Resistance10 kΩ | Resistance±1% | Rated Power0.1 W | Temperature Coefficient of Resistance (min.)-100 ppm/ °C | Temperature Coefficient of Resistance (max.)100 ppm/ °C | Limiting Element Voltage75 V | Technical ReferenceKS06031002F110KAATP0000 | – | – | – | – | – | ||||
| WRIS-RSKS Thick Film Resistors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWRIS-RSKS Thick Film Resistors | – | – | – | – | – | – | – | – | Size1206 | Operating Temperature -55 °C up to +155 °C | – | – | – | – | – | Length3.1 mm | Width1.6 mm | Height0.6 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Resistance2 MΩ | Resistance±1% | Rated Power0.25 W | Temperature Coefficient of Resistance (min.)-200 ppm/ °C | Temperature Coefficient of Resistance (max.)200 ppm/ °C | Limiting Element Voltage200 V | Technical ReferenceKS12062004F104DAATP0000 | – | – | – | – | – | ||||
| WRIS-RSKS Thick Film Resistors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWRIS-RSKS Thick Film Resistors | – | – | – | – | – | – | – | – | Size0603 | Operating Temperature -55 °C up to +155 °C | – | – | – | – | – | Length1.6 mm | Width0.8 mm | Height0.45 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Resistance100 kΩ | Resistance±1% | Rated Power0.1 W | Temperature Coefficient of Resistance (min.)-100 ppm/ °C | Temperature Coefficient of Resistance (max.)100 ppm/ °C | Limiting Element Voltage75 V | Technical ReferenceKS06031003F110KAATP0000 | – | – | – | – | – | ||||
| WRIS-RSKS Thick Film Resistors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWRIS-RSKS Thick Film Resistors | – | – | – | – | – | – | – | – | Size0603 | Operating Temperature -55 °C up to +155 °C | – | – | – | – | – | Length1.6 mm | Width0.8 mm | Height0.45 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Resistance3.3 kΩ | Resistance±1% | Rated Power0.1 W | Temperature Coefficient of Resistance (min.)-100 ppm/ °C | Temperature Coefficient of Resistance (max.)100 ppm/ °C | Limiting Element Voltage75 V | Technical ReferenceKS06033301F110KAATP0000 | – | – | – | – | – | ||||
| WRIS-RSKS Thick Film Resistors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWRIS-RSKS Thick Film Resistors | – | – | – | – | – | – | – | – | Size0603 | Operating Temperature -55 °C up to +155 °C | – | – | – | – | – | Length1.6 mm | Width0.8 mm | Height0.45 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Resistance220 kΩ | Resistance±1% | Rated Power0.1 W | Temperature Coefficient of Resistance (min.)-100 ppm/ °C | Temperature Coefficient of Resistance (max.)100 ppm/ °C | Limiting Element Voltage75 V | Technical ReferenceKS06032203F110KAATP0000 | – | – | – | – | – | ||||
| WRIS-RSKS Thick Film Resistors, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWRIS-RSKS Thick Film Resistors | – | – | – | – | – | – | – | – | Size1206 | Operating Temperature -55 °C up to +155 °C | – | – | – | – | – | Length3.1 mm | Width1.6 mm | Height0.6 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Resistance10 Ω | Resistance±1% | Rated Power0.25 W | Temperature Coefficient of Resistance (min.)-200 ppm/ °C | Temperature Coefficient of Resistance (max.)400 ppm/ °C | Limiting Element Voltage200 V | Technical ReferenceKS120610R0F104OAATP0000 | – | – | – | – | – |