Calculation tool
UCC28703
Constant-voltage, constant-current PWM with PSR, NTC option, and 300mV cable compensation
Data sheet
UCC28703
- < 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.
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Technical documentation
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View all 10 | 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 | 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
UCC28700EVM-068 — UCC28700 evaluation module
The Texas Instruments UCC28700EVM-068 evaluation module (EVM) helps designers evaluate the performance of the UCC28700 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)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
Ordering & quality
Information included:
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- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Information included:
- Fab location
- Assembly location
Support & training
TI E2E™ forums with technical support from TI engineers
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