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Flyback controllers

UCC28633

ACTIVE

High power Flyback controller with PSR, peak power mode, X-Cap discharge, Adj CC limit, freq dither

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Data sheet

UCC28633

ACTIVE
Data sheet Order now

Product details

Control mode Primary-side regulation UVLO thresholds on/off (V) 14.5/8 Duty cycle (Max) (%) 70 Features PSR, CCM, DCM, HV Start-up, Soft Start, OVP, Secondary Side Wake-up Rating Catalog Device type Controllers Topology Flyback
Control mode Primary-side regulation UVLO thresholds on/off (V) 14.5/8 Duty cycle (Max) (%) 70 Features PSR, CCM, DCM, HV Start-up, Soft Start, OVP, Secondary Side Wake-up Rating Catalog Device type Controllers Topology Flyback
SOIC (D) 7 29 mm² 4.9 x 6
  • 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
  • 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

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.

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.
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Technical documentation

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Type Title Date
* Data sheet UCC2863x, High-Power Flyback Controller with Primary-Side Regulation and Peak-Power Mode datasheet (Rev. D) PDF | HTML 15 Dec 2017
Certificate IEC 60065 Certification 15 Mar 2019
Certificate UCC28630 and UCC28633 IEC 62368 Certification 07 Feb 2019
Technical article Achieving Zero No-Load Power 06 Mar 2015
Application note Rapid Transient Response With UCC28633 PSR-Flyback and UCC24650 Wake-Up Monitor 27 Feb 2015

Design & development

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

Evaluation board

UCC28630EVM-572 — UCC28630 Evaluation Module

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.

User guide: PDF
Not available on TI.com
Calculation tool

UCC28630 Excel Design Calculator (Rev. D)

SLUC537D.ZIP (177 KB)
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Calculation tool

UCC28630 MathCad Design Calculator (Rev. B)

SLUC538B.ZIP (511 KB)
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Reference designs

PMP30092 — 160W Primary-Side Regulated Flyback Using UCC28633 Reference Design

The PMP30092 reference design uses the UCC28633 high power flyback converter to generate an isolated output (27V @ 6A). The UCC28633 operates in both CCM (continuous conduction mode) and DCM (discontinuous conduction mode). Primary side regulation eliminates the need for an opto-coupler and (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP9643 — 24V 65W Nominal 130W Surge Offline Flyback Power Supply for Industrial Rails Reference Design

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 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP9208 — 65W (130W Surge) Flyback Power Supply for Laptop Adapter Apps w/85-265VAC Input Reference Design

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 (...)
Test report: PDF
Schematic: PDF
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SOIC (D) 7 View options

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