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Texas Instruments UCC28704 | Demoboard TIDA-01503
20-W, 100- to 425-V DC, 85% Efficient, Multi-Output, Auxiliary Power Supply Reference Design
Overview
| Topology | Flyback Converter |
| Input voltage | 100-425 V |
| Switching frequency | 85 kHz |
| Output 1 | 15 V / 0.25 A |
| IC revision | 001 |
Description
This 20-W multiple output, auxiliary power reference design supports AC/DC industrial power supplies with a wide input voltage range (100-425 VDC). The design achieves a peak efficiency of 85% by using discontinuous conduction mode (DCM) valley-switching of TI’s UCC28704 flyback controller with primary side regulation. The compact design uses a minimum number of components to help protect the system, including output overcurrent and output short circuit. The hardware is tested to meet Conducted Emission norm EN55022 Class A using an external EMI filter.
Features
Remark: BOM and Test result are added.
FeaturesPeak power conversion efficiency of >85% at 400VDC full loadDesigned for wide operating input voltage range from 100- to 425-V DCDelivers full power of 20 W over the entire operating voltage rangeConfigurable outputs: 15V (primary referred), 5V & 15V (isolated)Low stand-by power of <100mWCompact form-factor to achieve high power density solutions: 40mm × 40mm
Typical applications
- Auxiliary Power for AC/DC, Server Power Supply
- Telecom Rectifiers
- UPS and Industrial Power Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN | VOut1(V) | IOut1(A) | VOut2(V) | IOut2(A) | Vaux(V) | L(µH) | fswitch(kHz) | NPRI : NSEC : NAUX | ISAT(A) | VT(V (AC)) | Size | Mount | L(mm) | W(mm) | H(mm) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-OLTI Offline Flyback Transformers, 71 - 301 V (AC), 15 V | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLTI Offline Flyback Transformers | Input Voltage 71 - 301 V (AC) | Output Voltage 115 V | Output Current 10.25 A | Output Voltage 25 V | Output Current 23 A | Auxiliary Voltage15 V | Inductance500 µH | Switching Frequency 85 | Turns Ratio8:1.75:1:2.75 | Saturation Current6 A | Insulation Test Voltage3000 V (AC) | SizeEE20/10/6 | MountTHT | Length22.2 mm | Width25.8 mm | Height16 mm |