Texas Instruments UCC28730 | Demoboard TIDA-01560

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

• Datasheet
• IC product information