UCC28701

SOT-23 (DBV)

6

5 mm² 2.9 x 1.6

< 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

< 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.

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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UCC28702

ACTIVE

Constant-voltage, constant-current PWM with PSR, NTC option, and 150mV cable compensation Cable compensation threshold is 150 mV

Technical documentation

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	Type	Title	Date
*	Data sheet	UCC2870x Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. A)	12 Dec 2014
	Application note	Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips	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

In stock

Limit: 3

Simulation model

UCC2870x PSPICE Transient Model

SLUM455.ZIP (131 KB) - PSpice Model

Simulation model

UCC2870x TINA-TI Transient Spice Model

SLUM617.ZIP (101 KB) - TINA-TI Spice Model

Simulation model

UCC2870x TINA-TI Transient Reference Design

SLUM619.TSC (195 KB) - TINA-TI Reference Design

Calculation tool

MathCAD Design Tool (Rev. C)

SLUC381C.ZIP (2519 KB)

Calculation tool

UCC28700 Excel 97 Design Tool (Rev. B)

SLUC408B.ZIP (205 KB)

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 (...)

Schematic

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 (...)

Schematic

Reference designs

PMP8502 — 5V@1.6A Isolated Primary-Side Regulated Flyback Using UCC28701 Reference Design

The PMP8502 reference design uses the UCC28701 quasi-resonant flyback converter to generate an isolated output (5V @ 1.6A). It is a low cost solution because no optocoupler is needed to regulate the output voltage.