High power Flyback controller with PSR, peak power mode, X-Cap discharge, and freq dither


Product details


Control mode Primary-side regulation Frequency (Max) (kHz) 120 UVLO thresholds on/off (V) 14.5/8 Duty cycle (Max) (%) 70 Features PSR, CCM, X-Cap Discharge, DCM, HV Start-up, Soft Start, OVP Operating temperature range (C) -40 to 125 Rating Catalog Device type Controllers Topology Flyback open-in-new Find other Flyback controllers

Package | Pins | Size

SOIC (D) 7 29 mm² 4.9 x 6 open-in-new Find other Flyback controllers


  • High-Power, Primary-Side CV/CC Regulation
  • Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) Operation
  • Built-In 700-V Start-Up Current Source
  • Active X-Capacitor Discharge (UCC28630 and UCC28633)
  • Adjustable Constant-Current (CC) Mode Limiting (except for UCC28630)
  • High Gate Drive Current 1-A Source and 2-A Sink
  • Low Power Modes for <30-mW System Standby
  • Best-In-Class Light Load (10%) Efficiency >85%
  • PSR design with no opto-coupler - can meet high CM isolation & surge requirements
  • VDD OVP for independent indirect output OV under open-feedback fault conditions
  • Peak-Power Mode for Transient Overload
  • Shutdown Pin Interface for External NTC
  • Protections: Overvoltage, Overcurrent, Over-Temperature, Overload Timer (UCC28630), AC Line UV, Brownout and Pin Protections
  • Frequency Dither to Ease EMI Compliance (except the UCC28632)
  • Create a Custom Design Using the UCC2863x With the WEBENCH® Power Designer
open-in-new Find other Flyback controllers


The UCC2863x targets high-power, primary-side regulated flyback converters. The ability to operate in both CCM and DCM make the device suitable for applications with a wide power range. The peak power mode allows transient peak power delivery up to 200% of nominal rating, with only a 25% peak current increase, maximizing transformer utilization.

The transformer bias winding is used to sense output voltage for regulation, and for low-loss input voltage sensing. Advanced sampling techniques allow CCM operation, and deliver excellent output voltage regulation performance for opto-coupler-less designs at power levels of 100 W and above.

A high-voltage current source enables fast and efficient start-up. Advanced light-load modes are deployed to reduce both controller and system power consumption at no load and light load. These modes enable potential system designs to meet 30-mW no-load power for power designs up to 30 W nominal, 60 W peak.

The device has been designed for ease-of-use and incorporates many features to enable a wide range of designs. Extensive protection features are included to simplify system design.

See the Device Comparison Table for details.

open-in-new Find other Flyback controllers

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 7
Type Title Date
* Data sheet UCC2863x, High-Power Flyback Controller with Primary-Side Regulation and Peak-Power Mode datasheet (Rev. D) Dec. 15, 2017
Certificate IEC 60065 Certification Mar. 15, 2019
Certificate UCC28630 and UCC28633 IEC 62368 Certification Feb. 07, 2019
Technical article Designing an energy-efficient BLDC ceiling fan solution Apr. 24, 2015
User guide UCC28630EVM-572, 65-W Nominal, 130-W Peak, Primary-Side Regulated Adapter Module (Rev. B) Mar. 18, 2015
Technical article Power packaging developments are advancing energy efficiency Jun. 26, 2014
Technical article APEC 2014: What is all of this industrial buzz?! Mar. 19, 2014

Design & development

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

Hardware development

UCC28630 Evaluation Module
document-generic User guide

The Texas Instruments UCC28630EVM-572 evaluation module (EVM) is a 65W primary side regulated (PSR) flyback converter for offline applications, with 130W transient surge capability. It is intended for evaluation purposes and is not intended to be an end product.

  • Transient peak power capability of 200% of nominal output power
  • Primary Side Regulation (PSR) eliminates opto-coupler
  • Active X-cap discharge for no-load power reduction.
  • +/- 1% Voltage regulation
  • +/- 7.5% Constant Current Regulation (7A nominal)
  • No audible noise.
  • Protection Functions: Output Over Voltage (...)

Design tools & simulation

SLUC537D.ZIP (177 KB)
SLUC538B.ZIP (511 KB)

Reference designs

PSR flyback for universal 85-VAC to 265-VAC input with 12-V/75-W rated output reference design
PMP10335 This design uses the PSR controller UCC28630 that is capable of operating in both CCM and DCM. With the help of X-cap discharge function of UCC28630, the safety discharge resistor can be elimiated. Full load efficiency is 83.5% at 120VAC/60Hz input and 86% at 230VAC/50Hz input.
document-generic Schematic
85-265Vac to 12V/3A and 24V/1.3A Power for Digital Televisions and Monitors Power Reference Design
PMP4444 — The PMP4444 is an universal AC input, 65W output flyback converter with primary-side regulation(PSR) enabled by the UCC28630D high-power flyback controller. The PSR solution eliminates the need for optocouplers and secondary-side feedback components creating a small, low BOM cost system. The (...)
document-generic Schematic
BLDC Ceiling Fan Controller with Sensorless Sinusoidal Current Control
TIDA-00386 This reference design is a brushless DC ceiling fan controller that runs from AC power.  It features the DRV10983 24-V three-phase motor driver to drive motors with sinusoidal current and sensorless control.  The UCC28630 converts 90-265 VAC into 24 VDC.  The MSP430G2201 value-line (...)
document-generic Schematic document-generic User guide
PSR Flyback Reference Design for 120V+/-15% AC Input and 24V/6A Output
PMP10912 The PMP10912 reference design uses the UCC28630 primary-side regulated controller on a two-switch flyback controller  to generate a 24V/6A output from 120VAC input with safety isolation rated transformer. Over 87% efficiency is achieved at full load in this design.
document-generic Schematic
Primary Side Regulated Flyback Reference Design with 120VAC Input and 24V/4A Rated Output
PMP10804 This reference design implements the UCC28630 PSR controller in a flyback power supply. The UCC28630 is capable of operating in both Continuous and Discontinuous Conduction Modes which enables high efficiency while reducing inductor size and cost. Safety standards such as EN60950 require that any (...)
document-generic Schematic
24V 65W Nominal 130W Surge Offline Flyback Power Supply for Industrial Rails Reference Design
PMP9643 24V Output, Constant Voltage / Constant Current, 65W Flyback power supply with 130W surge capability. Primary side regulation eliminates feedback opto-coupler and provides 1% regulation down to no-load. Average efficiency of > 89% and no load power of < 70mW are achieved. Voltage input range (...)
document-generic Schematic
65W (130W Surge) Flyback Power Supply for Laptop Adapter Apps w/85-265VAC Input Reference Design
PMP9208 The PMP9208 is a power adapter reference design for 19.5V output, constant voltage / constant current, 65W flyback power supply with 130W surge capability. Primary side regulation eliminates feedback opto-coupler and provides 1% regulation down to no-load. Average efficiency of > 89% and no load (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
SOIC (D) 7 View options

Ordering & quality

Information included:
  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​