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Texas Instruments UCC28730 | Demoboard TIDA-01560
15W Dual Isolated Output Bias Power Supply with 4mW Zero Standby Power Consumption Reference Design
Overview
| Topology | Flyback Converter |
| Input voltage | 85-265 V |
| Switching frequency | 76-90 kHz |
| Output 1 | 12 V / 1.12 A |
| Output 2 | 3.3 V / 0.3 A |
| IC revision | E1 |
Description
This reference design is a 15-W bias power supply with two isolated outputs (12 V/1.125A and 3.3 V/0.3A) and a total standby power consumption of 4 mW under a 220-V AC input. The controller uses primary-side regulation (PSR) and detects a wake-up signal from the UCC24650 secondary-side voltage-droop monitor for improved transient response to large load steps. This reference design demonstrates how the UCC28730 can provide ultra-low standby power without sacrificing start-up time or output transient response with an internal 700-V start-up switch, dynamically controlled operating states, and a tailored modulation profile. The UCC28730 uses frequency modulation, peak primary current modulation, valley switching, and valley skipping in its control algorithm to maximize efficiency over the entire operating range.
Features
Enables zero-power standby consumption: 3.1 mW at 115-V AC Input4.2 mW at 220-V AC InputAverage efficiency >84%, exceeds DoE VI and CoC tier 2 specificationsPrimary-side regulation (PSR) eliminates optocoupler and increase reliability of bias power supplyResonant-ring valley-switching operation for highest overall efficiencyUniversal input voltage range (85V to 270V AC) to address customer needs across all regionsDual isolated outputs of 12V and 3.3V is suitable for most industry applicationsFrequency-dither to ease EMI compliance
Typical applications
- Standby and Auxiliary Power Supplies / Adapters and Chargers for Smart Phones, line ranges. / TV and Monitor Power Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | ISAT,10%(A) | fres(MHz) | Version | IR(A) | L(µH) | RDC max.(Ω) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-TI Radial Leaded Wire Wound Inductor, 0.4 A, 3.4 MHz | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | Saturation Current @ 10%0.4 A | Self Resonant Frequency3.4 MHz | VersionHeat Shrinking Tube | Rated Current0.35 A | Inductance470 µH | DC Resistance2.4 Ω | – | – | – | Length6 mm | Width6 mm | Height8.5 mm | MountTHT | ||||
 | 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 Current2 A | Inductance1000 µH | DC Resistance0.045 Ω | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length15 mm | Width7.8 mm | Height18 mm | MountTHT | ||||
 | 750343769 | Transformer, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Transformer | – | – | – | – | Inductance620 µH | – | – | Insulation Test Voltage3000 V (AC) | – | Length21.5 mm | Width29 mm | Height12.4 mm | MountTHT |