UCC28704

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Off-lineconstant-voltage constant-current Flyback controller with primary-side regulation (PSR)

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Product details

Parameters

Control method Primary-side regulation Duty cycle (Max) (%) 99 Frequency (Max) (kHz) 85 UVLO thresholds on/off (V) 21/7.7 Features PSR, DCM Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Flyback controllers

Package | Pins | Size

SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 open-in-new Find other Flyback controllers

Features

  • Efficiency Performance Exceeds DoE Level VI and EU CoC V5 Tier-2 External Power Supply Standards
  • Primary-Side Regulation Eliminates Opto-Coupler and Secondary Feedback Components
  • Compatible with Synchronous Rectifier
  • Enables <30-mW No-Load Input Power
  • ±5% Output Voltage (CV) and Current (CC) Regulation
  • Enhanced Dynamic Load Response
  • Constant Current Output Under-Voltage Protection (CCUV) with Auto-Restart Response
  • Cable Compensation (300 mV at 5-V Full Load)
  • 85-kHz Maximum Switching Frequency
  • DCM Valley-Switching Operation
  • Clamped Gate-Drive Output for MOSFET
  • NTC Resistor Interface
  • Resistor or External HV Depletion-Mode FET Start-Up
  • Fault Protections: Input Low Line, Output Over-Voltage, Over-Current, and Short-Circuit
  • SOT23-6 Package
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Description

The UCC28704 Off-line flyback controller is a highly integrated, 6-pin primary-side regulated PWM controller for designing high efficiency AC-to-DC power supplies with low standby power consumption to comply with global efficiency standards. The controller has ultra-low current consumption at start-up to enable designs with <30-mW no-load input power and save standby mode energy consumption. Intelligent primary-side sensing and control enables 5% output voltage and current control without using an opto coupler or secondary-side feedback circuits.

UCC28704 incorporates an enhanced load transient response technique which helps minimize the output capacitor, reducing the overall system size and cost. The controller also eliminates the need for loop compensation components which simplify the design and debugging process for power supply designers. The converter output voltage and current is regulated to prevent overstress conditions that may damage the load or connectors. Similarly, the CCUV shutdown feature monitors for an output under voltage fault to protect connectors from over heat or burn out from soft shorts, which greatly enhance overall system reliability. Board or component over temperature protection is facilitated with an NTC interface pin.

UCC28704 can be readily used with TI secondary-side synchronous rectifier (SR) controllers at 2-A or higher output current levels for higher conversion efficiency or more compact designs.

For all available packages, see the orderable addendum at the end of the datasheet.
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Technical documentation

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Type Title Date
* Datasheet UCC28704 High-Efficiency Off-Line CV and CC Flyback Controller with Primary-Side Regulation (PSR) datasheet (Rev. A) Feb. 17, 2016
Application notes Minimize Standby Consumption for UCC287XX Family Aug. 01, 2019
Application notes Selecting Electrolitic Bus Capacitor for Universal Input Jul. 17, 2018
Technical articles Making a solar inverter more reliable than the sun Aug. 01, 2017
Technical articles Powering the IoT Jan. 26, 2017
Application notes Design UCC28704 With UCC24636 (PSR+SR) Jan. 12, 2017
Technical articles Biasing an SR controller IC in USB smartphone charging applications Dec. 08, 2016
Technical articles USB Type-C: charging a new world Oct. 04, 2016
Application notes Troubleshooting TI PSR controllers Oct. 03, 2016
User guides Using the UCC28704EVM-724 10-W USB Adapter Jan. 26, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$99.00
Description

The UCC28704EVM-724 is a 10-W off-line isolated power supply providing 5-V output on a USB-A port. The converter output voltage and current are regulated to 5% accuracy without using an optocoupler or secondary-side feedback circuits. The EVM demonstrates a low-cost solution to comply with (...)

Features
  • Universal AC input range (85-V to 265-V AC), 5-V/2-A isolated output
  • 5% output voltage (CV) and current (CC) accuracy with primary-side regulation (PSR)
  • 83% average efficiency and <60-mW standby power performance exceeds DoE Level VI and EU CoC V5 Tier-2 EPS standards
  • 80-mV p-p output voltage ripple at (...)

Design tools & simulation

SIMULATION MODELS Download
SLUM541.ZIP (88 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
3.6-W AC/DC coupled inductor buck reference design
PMP22161 — This reference design is a non-isolated AC/DC power supply design using the UCC28704 PSR controller to implement a high-voltage buck converter. The converter provides 6 V at 600 mA from an AC input of 100 VAC to 132 VAC. The design uses a coupled inductor to provide a 12-V supply voltage to the (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal input reference design for 12-V lead acid battery charger
PMP21618 — This reference design takes a Universal AC input (85 VAC - 265 VAC) and converts to a 17.5-V isolated output using a PSR flyback topology. It is then followed by a battery charger circuit, which outputs up to 15 V to a lead acid battery. This is a fast-charge design capable of delivering 12 V @ 2.5 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
20W, 100-425VDC, 85% Efficient, Multi-Output, Auxiliary Power Supply Reference Design
TIDA-01503 — This 20-W multiple output, auxiliary power reference design supports AC/DC industrial power supplies with a wide input voltage range (100-425 VDC). The design achieves a peak efficiency of 85% by using discontinuous conduction mode (DCM) valley-switching of TI’s UCC28704 flyback controller (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
US Line (120VAC +/- 15%) Input, 12V/1.5A Output Bias Supply Reference Design
PMP20990 — The PMP20990 is a low cost bias supply reference design with 12V/1.5A output from 120VAC input. This design uses a UCC28704 constant current/constant voltage PWM with primary-side regulation flyback controller to reduce the BOM cost.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal AC Input to 5V 1.5A USB Type-C™ DFP Output Adapter Reference Design
PMP40260 — The PMP40260 is a reference design for USB Type-C™ adapter applications, it can provide 5V 1.5A for the USB Type-C™ device, as well as a legacy device which supports DCP charging protocol. The solution implements a high efficiency primary side controller UCC28704. The system performance (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
36-57VIN,12V 2A PSR Reference Design for PoE
PMP40144 — The PMP40144 is a 12V 2A reference design solution for PoE applications. The solution implements a high efficiency primary side controller UCC28704, eliminating feedback components(TL431, opto-coupler). The efficiency is >89% at full load. Integrated input UVLO, OVP and output OVP, OCP improves (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
120VAC Input, PSR 5V 25W Flyback Reference Design
PMP20771 — This reference design is a 120Vac to 5V primary side regulated flyback converter with synchronous rectification on the secondary side.  The reference design has extremely low standby power at 67mW.  UCC28704 features integrated CC-CV regulation without the use of an optocoupler. PMP20771 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
80V/50W PSR Flyback Reference Design
PMP20545 — This reference design is a universal line 85-265VAC input to 80V/50W power supply in a small form-factor, cost-effective design. It uses the UCC28704 controller. The design features an optional FET-startup circuit for low standby power and achieves over 91% efficiency. The PMP20545 Board is a (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Low Cost Universal AC Input to 5V 2A Output Reference Design
PMP40228 — The PMP40228 is a reference design for 5V 2A adapter applications. The solution implements a high efficiency primary side controller UCC28704, it meets COC V5 Tier2 2016 specification with 130mOhm cable, it is fully test and passes conduction EMI. The board uses a single layer PCB and diode (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal AC Input to 5V/3A Output Reference Design DOE6 and COC V5 Tier 2 Compliant
PMP15002 — The PMP15002 is a highly efficient, universal AC input to 5V 3A output reference design for cost-optimized adapter and charger applications. The topology is primary-side regulated quasi resonant flyback with synchronous rectification.  With the use of primary-side regulation, it eliminates the (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Efficiency Universal AC Input to 5V 2A Adapter Reference Design
PMP11600 — The PMP11600 is a reference design for 5V 2A adapter applications. The solution implements a high efficiency primary side controller UCC28704, it is fully tested and passes conduction EMI. This design uses Volt-Second balance control synchronous rectifier UCC24636 for high efficiency. The board (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal AC Input to 5V 2A Output Reference Design CoC Tier 2 2016 Compliant
PMP11612 The PMP11612 is a reference design for 5V 2A adapter applications. The solution implements a high efficiency primary side controller UCC28704, it is fully test and passes conduction and Radiation EMI. This design uses diode rectifier for low cost and meets COC V5 Tier2 2016 specification with (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SOT-23 (DBV) 6 View options

Ordering & quality

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