TIDA-010060

Off-line (non-isolated) AC/DC power supply architectures reference design for grid applications

TIDA-010060

Design files

Overview

This reference design showcases three non-isolated AC/DC power supply topologies for line-powered applications such as residential circuit interrupters, circuit breakers, home automation equipment and appliances for < 100 mA. The three topologies are:

  • Off-line switcher using inductor
  • AC line regulator using switched capacitor (active-clamped capacitor-drop based power supply)
  • Capacitive-drop regulator (cap-drop power supply)


The trade-off between efficiency, start-up time and solution size is done across architectures for various input and output conditions. The design methodology, test data and comparison is included for system designers to quickly evaluate and customize their solution.

Features
  • Off-line switcher using the UCC28880: High efficiency architecture using a buck converter simplifies the design covering universal input voltage – applications requiring fast startup (< 2 ms), small footprint or need to meet stringent surge requirements
  • Switching capacitor-drop power supply using the TPS7A78: Inductor-less architecture customized for a narrow input voltage range  – high efficiency solution for low current (< 30 mA) and a single chip solution with integrated active rectifier and LDO
  • Capacitor-drop (cap-drop) power supply using an LDO: Simplified solution with passive components and LDO – low-cost solution with low efficiency, high startup time and large footprint

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUEQ2.PDF (2807 K)

Reference design overview and verified performance test data

TIDRZH6.PDF (384 K)

Detailed schematic diagram for design layout and components

TIDRZH7.PDF (40 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRZH8.PDF (196 K)

Detailed overview of design layout for component placement

TIDRZI0.ZIP (815 K)

Files used for 3D models or 2D drawings of IC components

TIDCFF0.ZIP (747 K)

Design file that contains information on physical board layer of design PCB

TIDRZH9.PDF (1007 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28880High voltage switcher for Non-isolated AC/DC Conversion

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

LP2992250-mA, 16-V, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7A78120-mA smart cap-drop low-dropout (LDO) linear voltage regulator

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide Off-Line (Non-Isolated) AC/DC Power Supply Architectures Reference Design for Gr Apr. 12, 2019

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