Product details

Control mode Primary-side regulation 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, Secondary Side Wake-up Operating temperature range (C) -40 to 125 Rating Catalog Device type Controllers Topology Buck, Flyback
Control mode Primary-side regulation 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, Secondary Side Wake-up Operating temperature range (C) -40 to 125 Rating Catalog Device type Controllers Topology Buck, Flyback
SOIC (D) 7 29 mm² 4.9 x 6
  • 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
  • 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

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.

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
* Data sheet UCC28730 Zero-Power Standby PSR Flyback Controller With CVCC and Wake-Up Monitoring datasheet (Rev. A) 30 May 2017
Application note Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips 31 Aug 2021
More literature Achieving High Power Density and Ultra Low Standby Power in Flyback Converters 23 Mar 2021
Application note Minimize Standby Consumption for UCC287XX Family 01 Aug 2019
Technical article Get smarter about ‘zero’ standby power in your next appliance design 27 Aug 2018
Application note Troubleshooting TI PSR controllers 03 Oct 2016
Technical article Keeping up with the standards: Efficiency and standby power requirements 12 May 2016
Technical article USB Wall Chargers: Conveniences and Challenges 06 Oct 2015
White paper Control Challenges for Low Power AC/DC Converters 02 Oct 2015
White paper Control Challenges for Low Power AC/DC Converters (PPT) 02 Oct 2015
Technical article Achieving Zero No-Load Power 06 Mar 2015
EVM User's guide Using the UCC28730EVM-552 10-W Adaptor Module With PSR and Wake-Up Monitor 06 Feb 2015

Design & development

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Evaluation board

UCC28730EVM-552 — UCC28730 Primary Side Flyback Controller with UCC24650 Secondary Side Wake Up

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 (...)

Simulation model

UCC28730 & UCC24650 PSpice Transient Model

SLUM527.ZIP (103 KB) - PSpice Model
Calculation tool

UCC28730 Design Calculator (Rev. A)

SLUC579A.ZIP (77 KB)
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