UCC28911

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700V Flyback switcher with constant-voltage constant-current and primary-side regulation

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Product details

Parameters

Control method Current Output power 85-265 Vac (Max) (W) 10 Output power 175-265 Vac (Max) (W) 12 Vin (Min) (V) 30 Topology Buck, Flyback Duty cycle (Max) (%) 99 Frequency (Max) (kHz) 115 UVLO thresholds on/off (V) 9.5/6.5 Operating temperature range (C) -40 to 125 open-in-new Find other Offline converters

Package | Pins | Size

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

Features

  • Constant-Voltage (CV) and Constant-Current (CC) Output Regulation Without Optical-Coupler
  • ±5% Output Voltage Regulation Accuracy
  • ±5% Output Current Regulation With AC Line and Primary Inductance Tolerance Compensation
  • 700-V Start-Up and Smart Power Management Enables <30-mW Standby Power
  • 115-kHz Maximum Switching Frequency Design for High-Power Density
  • Valley Switching and Frequency Dithering to Ease EMI Compliance
  • Thermal Shut Down
  • Low Line and Output Over-Voltage Protection
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Description

The UCC28910 and UCC28911 are high-voltage flyback switchers that provide output voltage and current regulation without the use of an optical coupler. Both devices incorporate a 700-V power FET and a controller that process operating information from the flyback auxiliary winding and power FET to provide a precise output voltage and current control. The integrated high-voltage current source for startup that is switched off during device operation, and the controller current consumption is dynamically adjusted with load. Both enable the very low stand-by power consumption.

Control algorithms in the UCC28910 and UCC28911, combining switching frequency and peak primary current modulation, allow operating efficiencies to meet or exceed applicable standards. Discontinuous conduction mode (DCM) with valley switching is used to reduce switching losses. Built-in protection features help to keep secondary and primary component stress levels in check across the operating range. The frequency jitter helps to reduce EMI filter

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Technical documentation

Design & development

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

Hardware development

EVALUATION BOARDS Download
UCC28911 Evaluation Module
UCC28911EVM-718
document-generic User guide
$99.00
Description

The UCC28911EVM-718 evaluation module is an offline Flyback power supply that provides isolated output voltage and current regulation without the use of an optocoupler and secondary-side feedback components. The input accepts a voltage range of 85VAC to 265VAC, 47Hz to 64Hz. The evaluation module (...)

Features
  • Isolated 7.5W, 5V output
  • Less than 20mW standby power consumption
  • Primary side regulation eliminates opto-coupler
  • Universal off-line input voltage range
  • Output over voltage protection
  • Input under voltage protection
  • Thermal Shutdown
  • Controlled start up and restart after fault Protection

Design tools & simulation

CALCULATION TOOLS Download
SLUC624A.ZIP (91 KB)

Reference designs

REFERENCE DESIGNS Download
>95% Efficiency, 1-kW analog control AC/DC reference design for 5G telecom rectifier
TIDA-010081 — This compact, high efficiency reference design with a 54-V DC, 1000-W output targets 5G telecom power and industrial AC/DC power supplies. The circuit consists of a front-end continuous conduction mode (CCM) power factor correction (PFC) circuit based on the UCC28180, followed by a robust LLC stage (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
1-kW, 80 Plus titanium, GaN CCM totem pole bridgeless PFC and half-bridge LLC reference design
TIDA-010062 This reference design is a digitally controlled, compact 1-kW AC/DC power supply design for server power supply unit (PSU) and telecom rectifier applications. The highly efficient design supports two main power stages, including a front-end continuous conduction (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal input to 12 V at 1-A isolated flyback reference design
PMP30605 — Constant voltage/constant current power supplies generate 12 V at 1-A output at 80% average efficiency with greater than 75% efficiency at 10% load and less than 30 mW (at 230 VAC) no load power. The design features primary side regulation (PSR) and integrated 700-V FET. With a low component count (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal Input to 12V@670mA & -10V@50mA Isolated Flyback with Integrated Switch Reference Design
PMP30070 — A quasi-resonant primary-side regulated Flyback supplies an isolated output 12V @ 670mA and non-isolated output -10V @ 50mA from universal input voltage (90Vac to 270Vac). The controller integrates 700V FET and the board is able to withstand up to 350VAC without damage and switches OFF for Vin > (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal Input to 12V@500mA PSR Isolated Flyback with Integrated 700V Switch Reference Design
PMP30032 — A quasi-resonant primary-side regulated isolated Flyback is used to provide 12V @ 500mA from universal input voltage (90Vac to 265Vac). The converter does not employ any optocoupler and regulates the output voltage by sensing the auxiliary winding on primary side. A peak input voltage detector is (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
10W Bias Supply for Brushless DC Applications with >75% Efficiency at Low Load Reference Design
TIDA-00473 The TIDA-00473 is a reference design of universal input, 10-W high efficiency, low cost power supply with three isolated outputs. This is a Constant-Voltage (CV) and Constant-Current (CC) flyback converter without Optical-Coupler and external MOSFET. The hardware is designed and tested to pass (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal Input to 12V@1A PSR Isolated Flyback with Integrated 700V Switch Reference Design
PMP30026 — A quasi-resonant primary-side regulated isolated Flyback is used to provide 12V @ 1A from universal input voltage (90Vac to 264Vac). The converter does not employ any optocoupler and regulates the output voltage by sensing the auxiliary winding on primary side. A peak input voltage detector is used (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
8W Primary-Side Regulated Flyback Using UCC28911 Reference Design
PMP11774 — The PMP11774 reference design uses the UCC28911 quasi-resonant flyback converter to generate two isolated outputs (18V @ 0.35A, 5V @ 0.35A). The UCC28911 incorporates a 700V power FET and provides primary-side regulation, eliminating the need for an opto-coupler and reducing the total component (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
8.5W Dual Output (5V/12V) Universal Input AC/DC Isolated Flyback Reference Design with PSR
TIDA-00618 The TIDA-00618 reference design is a Primary Side Regulation switcher which provides isolated dual outputs, 5V and 12V rails, with DC stacking of the secondaries to provide output voltage regulation that is equivalent to opto-coupler based solution.

Low system parts count and built in advanced (...)

document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
AC/DC Auxiliary Supply Reference Design Using UCC28911
PMP10767 The PMP10767 reference design uses Buck converter to convert universal AC input voltage  to a 15V/0.13A DC output with UCC28911 controller. Circuit simplicity is achieved with quasi-resonant valley-switching operation and the utilization of Buck topology. Peak 77% efficiency is achieved at full (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
MOSFET Integrated PSR Flyback Reference Design for Universal AC Input and 5V/1.4A Output
PMP10467 The PMP10467 reference design uses the UCC28911 primary-side regulated flyback controller with integrated MOSFET to generate a 5V/1.4A output from an univeral AC input with safety isolation rated transformer on a single layer board. About 50degC temperature rise on UCC28911 is observed at full load (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Smart Plug with Remote Disconnect and Wi-Fi Connectivity
TIDC-SMARTPLUG-WIFI This design implements single-outlet energy measurement with remote connect/disconnect capability and Wi-Fi connectivity. Designers can quickly create networked load control devices for industrial building and home automation applications.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
85 to 265VAC Input 5V/7.5W Low Cost Small Size Flyback Reference Design
PMP9045 Constant Voltage/Constant Current power supply generates 5V at 1.5A output at 80% average efficiency with greater than 76% efficiency at 10% load and less than 30mW no load power. The design features primary side regulation (PSR) and integrated flyback switcher. With a low component count and low (...)
document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
Universal Input to 12.2V @ 500mA Non-Isolated Quasi-Resonant Flyback Reference Design
PMP8583 — The PMP8583 is a non-isolated quasi-resonant flyback, which converts the universal input mains to 12.2V, and is limited to 0.5A. The controller UCC28910 has an internal Mosfet that is rated at 700V.
Design files

CAD/CAE symbols

Package Pins Download
SOIC (D) 7 View options

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