The UCC28700 family of flyback power supply controllers provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. Low start-up current, dynamically controlled operating states and a tailored modulation profile support very low standby power without sacrificing start-up time or output transient response.
Control algorithms in the UCC28700 family allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET power switch. Discontinuous Conduction Mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.
The controllers have a maximum switching frequency of 130 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28700 allows the level of cable compensation to be programmed. The UCC28701, UCC28702, and UCC28703 devices allow remote temperature sensing using a Negative Temperature Coefficient (NTC) resistor while providing fixed cable-compensation levels.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC2870x Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. A) | PDF | HTML | 12 Dec 2014 |
| Application note | Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips | PDF | HTML | 31 Aug 2021 | |
| Application note | Minimize Standby Consumption for UCC287XX Family | 01 Aug 2019 | ||
| Application note | Selecting Electrolitic Bus Capacitor for Universal Input | 17 Jul 2018 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Application note | Troubleshooting TI PSR controllers | 03 Oct 2016 | ||
| 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 | ||
| Application note | Is Your IGBT Gate-Driver Power Supply Optimized | 12 Mar 2015 | ||
| Application note | UCC28700 5-W USB Flyback Design Review (Rev. C) | 21 Feb 2014 | ||
| More literature | Exposing the Inner Behavior of a Quasi-Resonant Flyback Converter | 29 Oct 2013 |
For additional terms or required resources, click any title below to view the detail page where available.
UCC28711 evaluation module
| Package | Pins | Download |
|---|---|---|
| SOT-23 (DBV) | 6 | View options |
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