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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
- Telecom Rectifiers
- Auxiliary Power for AC/DC, Server Power Supply
- 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) | fswitch (kHz) | L (µH) | NPRI : NSEC : NAUX | VT (V (AC)) | L (mm) | W (mm) | H (mm) | Mount | Size | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 750343661 | SPEC | 4 files | Active i| Production is active. Expected lifetime: >10 years. | MID-OLTI Offline Flyback Transformers for Texas Instruments | 70 - 300 V (AC) | 15 | 0.25 | 5 | 2 | 85 | 500 | 16 : 2.75 : 1 : 2.75 | 3000 | 22.2 | 25.8 | 16 | THT | EE20/10/6 |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN | VOut1 (V) | IOut1 (A) | VOut2 (V) | IOut2 (A) | fswitch (kHz) | L (µH) | NPRI : NSEC : NAUX | VT (V (AC)) | L (mm) | W (mm) | H (mm) | Mount | Size | Samples |
|---|