UCC28730

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Zero sandby PSR Flyback controller with CVCC and wake-up monitoring

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Product details

Parameters

Control method Primary-side regulation Duty cycle (Max) (%) 99 Frequency (Max) (kHz) 83 UVLO thresholds on/off (V) 21/7 Features PSR, DCM, HV Start-up, Low Power, Light Load Efficiency, Current Limiting, Thermal Shutdown, Green Mode, Input Line Monitor, Leading Edge Blanking, Soft Start Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Flyback controllers

Package | Pins | Size

SOIC (D) 7 29 mm² 4.9 x 6 open-in-new Find other Flyback controllers

Features

  • Enables Zero-Power (<5 mW) standby consumption
  • Smart Wake-Up detection enables smallest output capacitance
  • Primary-side regulation (PSR) eliminates optocoupler
  • ±5% voltage regulation and current regulation across line and load
  • 700-V start-up switch
  • 83-kHz maximum switching frequency enables low stand-by power charger designs
  • Resonant-ring valley-switching operation for highest overall efficiency
  • Frequency-dither to ease EMI compliance
  • Clamped gate-drive output for MOSFET
  • Overvoltage, low-line, and overcurrent protection functions
  • Programmable cable compensation
  • SOIC-7 package

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Description

The UCC28730 isolated-flyback power supply controller provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler, and wake-up signal detection to improve transient response to large load steps. A minimum switching frequency of 30 Hz facilitates achieving less than 5 mW of no-load power. This device processes information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. The wake-up monitoring works with a secondary-side alarm device such as the UCC24650 to deliver rapid response to heavy load steps using minimal output capacitance.

An internal 700-V start-up switch, dynamically- controlled operating states and a tailored modulation profile support ultra-low stand-by power without sacrificing start-up time or output transient response. Control algorithms in the UCC28730 allow operating efficiencies to meet or exceed applicable standards. Discontinuous conduction mode (DCM) operation with valley-switching reduces switching losses. Modulation of the switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

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Technical documentation

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Type Title Date
* Datasheet UCC28730 Zero-Power Standby PSR Flyback Controller With CVCC and Wake-Up Monitoring datasheet (Rev. A) May 30, 2017
Application notes Minimize Standby Consumption for UCC287XX Family Aug. 01, 2019
Technical articles Get smarter about ‘zero’ standby power in your next appliance design Aug. 27, 2018
Application notes Troubleshooting TI PSR controllers Oct. 03, 2016
Technical articles Keeping up with the standards: Efficiency and standby power requirements May 12, 2016
Technical articles USB Wall Chargers: Conveniences and Challenges Oct. 06, 2015
White papers Control Challenges for Low Power AC/DC Converters Oct. 02, 2015
White papers Control Challenges for Low Power AC/DC Converters (PPT) Oct. 02, 2015
Technical articles Achieving Zero No-Load Power Mar. 06, 2015
User guides Using the UCC28730EVM-552 10-W Adaptor Module With PSR and Wake-Up Monitor Feb. 06, 2015

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
99
Description

The UCC28730EVM-552 evaluation module is a 10-W off-line discontinuous mode (DCM) flyback converter that provides constant-voltage (CV) and constant-current (CC) output regulation without the use of an optical coupler.  The primary side controller detects a wake-up signal from the secondary (...)

Features
  • Less than 5mW of no-load power
  • Primary side regulation eliminates opto-coupler
  • Wake-up detection helps minimize no-load switching frequency and output capacitance
  • +/-5% voltage and current regulation across line and load
  • Resonant ring valley switching operation for highest overall efficiency

Design tools & simulation

SIMULATION MODELS Download
SLUM527.ZIP (103 KB) - PSpice Model
CALCULATION TOOLS Download
SLUC579A.ZIP (77 KB)

Reference designs

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CAD/CAE symbols

Package Pins Download
SOIC (D) 7 View options

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