Texas Instruments TPS7A7833PWPR | Demoboard TIDA-010060

Description

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 inductorAC line regulator using switched capacitorCapacitive-drop regulatorThe 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 regulator 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 regulator using an LDO: Simplified solution with passive components and LDO – low-cost solution with low efficiency, high startup time and large footprint

Typical applications

• Garage door systems
• Electricity meters
• Key panels
• Small home appliances
• Smoke and heat detectors / Thermostats

More information

• Datasheet
• IC product information