Calculation tool
UCC28701
Constant-voltage, constant-current PWM with PSR, NTC option, and 0 mV cable compensation
Data sheet
UCC28701
- < 30-mW No-Load Power for 5-Star Rating
- Primary-Side Regulation (PSR) Eliminates Opto-Coupler
- ±5% Voltage and Current Regulation
- 130-kHz Maximum Switching Frequency Enables High-Power
Density Charger Designs - Quasi-Resonant Valley-Switching Operation for Highest
Overall Efficiency - Patent-Pending Frequency-Jitter Scheme to Ease EMI
Compliance - Wide VDD Range Allows Small Bias Capacitor
- Clamped Gate-Drive Output for MOSFET
- Protection Functions: Overvoltage, Low-Line, and
Overcurrent - Programmable Cable Compensation (UCC28700 Only)
- NTC Resistor Interface (UCC28701, UCC28702 and UCC28703
Only) With Fixed Cable Compensation Options - SOT-23 Package
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.
Technical documentation
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View all 11 | 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 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
UCC28711EVM-160 — UCC28711 evaluation module
The Texas Instruments UCC28711EVM-160 evaluation module (EVM) helps designers evaluate the performance of the UCC28711 Constant-Voltage, Constant-Current PWM with Primary-Side Regulation. The 5W EVM is used for evaluating an off line adapter for USB applications. It converts a 90V to 265V RMS (...)
User guide: PDF
Simulation model
UCC2870x TINA-TI Transient Reference Design
SLUM619.TSC (195 KB) - TINA-TI Reference Design
Calculation tool
SLUC408 — UCC28700 Excel 97 Design Tool
Supported products & hardware
Products
AC/DC & DC/DC controllers (external FET)
Reference designs
PMP12082 — 3-Phase AC Input, Triple Output Bias Supply Reference Design
The PMP12082 is a bias supply reference design with 3-phase input (80VAC~280VAC) and triple outputs - 7V/1.4A, 3.3V/500mA, and 3.3V/300mA. UCC28701 primary side regulation controller is applied for a Cascode-MOSFET flyback converter with dual output windings. One winding supplies 7V/1.4A output (...)
Reference designs
TIDA-00182 — Reinforced Isolated IGBT Gate Drive Flyback Power Supply with 8 Outputs Reference Design
This reference design provides reinforced isolated positive and negative voltage rails required for Insulated Gate Bipolar Transistor (IGBT) gate drivers from a single 24-volt DC input supply. Utilizing a flyback isolated control topology, this reference design provides isolation compliant to (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
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