UCC28730

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Zero sandby PSR Flyback controller with CVCC and wake-up monitoring

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Product details

Parameters

Control method Primary-side regulation Duty cycle (Max) (%) 99 Frequency (Max) (kHz) 83 UVLO thresholds on/off (V) 21/7 Features PSR, DCM, HV Start-up, Low Power, Light Load Efficiency, Current Limiting, Thermal Shutdown, Green Mode, Input Line Monitor, Leading Edge Blanking, Soft Start Operating temperature range (C) -40 to 125 Rating Catalog 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

Features

  • Enables Zero-Power (<5 mW) standby consumption
  • Smart Wake-Up detection enables smallest output capacitance
  • Primary-side regulation (PSR) eliminates optocoupler
  • ±5% voltage regulation and current regulation across line and load
  • 700-V start-up switch
  • 83-kHz maximum switching frequency enables low stand-by power charger designs
  • Resonant-ring valley-switching operation for highest overall efficiency
  • Frequency-dither to ease EMI compliance
  • Clamped gate-drive output for MOSFET
  • Overvoltage, low-line, and overcurrent protection functions
  • Programmable cable compensation
  • SOIC-7 package

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Description

The UCC28730 isolated-flyback power supply controller provides Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler, and wake-up signal detection to improve transient response to large load steps. A minimum switching frequency of 30 Hz facilitates achieving less than 5 mW of no-load power. This device processes information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current. The wake-up monitoring works with a secondary-side alarm device such as the UCC24650 to deliver rapid response to heavy load steps using minimal output capacitance.

An internal 700-V start-up switch, dynamically- controlled operating states and a tailored modulation profile support ultra-low stand-by power without sacrificing start-up time or output transient response. Control algorithms in the UCC28730 allow operating efficiencies to meet or exceed applicable standards. Discontinuous conduction mode (DCM) operation with valley-switching reduces switching losses. Modulation of the switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

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Technical documentation

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Type Title Date
* Datasheet UCC28730 Zero-Power Standby PSR Flyback Controller With CVCC and Wake-Up Monitoring datasheet (Rev. A) May 30, 2017
Application notes Minimize Standby Consumption for UCC287XX Family Aug. 01, 2019
Technical articles Get smarter about ‘zero’ standby power in your next appliance design Aug. 27, 2018
Application notes Troubleshooting TI PSR controllers Oct. 03, 2016
Technical articles Keeping up with the standards: Efficiency and standby power requirements May 12, 2016
Application notes Choosing Standard Recovery Diode or Ultra-Fast Diode in Snubber Oct. 09, 2015
Technical articles USB Wall Chargers: Conveniences and Challenges Oct. 06, 2015
White papers Control Challenges for Low Power AC/DC Converters Oct. 02, 2015
White papers Control Challenges for Low Power AC/DC Converters (PPT) Oct. 02, 2015
Technical articles Achieving Zero No-Load Power Mar. 06, 2015
User guides Using the UCC28730EVM-552 10-W Adaptor Module With PSR and Wake-Up Monitor Feb. 06, 2015

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 UCC28730EVM-552 evaluation module is a 10-W off-line discontinuous mode (DCM) flyback converter that provides constant-voltage (CV) and constant-current (CC) output regulation without the use of an optical coupler.  The primary side controller detects a wake-up signal from the secondary (...)

Features
  • Less than 5mW of no-load power
  • Primary side regulation eliminates opto-coupler
  • Wake-up detection helps minimize no-load switching frequency and output capacitance
  • +/-5% voltage and current regulation across line and load
  • Resonant ring valley switching operation for highest overall efficiency

Design tools & simulation

SIMULATION MODELS Download
SLUM527.ZIP (103 KB) - PSpice Model
CALCULATION TOOLS Download
SLUC579A.ZIP (77 KB)

Reference designs

REFERENCE DESIGNS Download
15W Dual Isolated Output Bias Power Supply with 4mW Zero Standby Power Consumption Reference Design
TIDA-01560 — This reference design is a 15-W bias power supply with two isolated outputs (12 V/1.125A and 3.3 V/0.3A) and a total standby power consumption of 4 mW under a 220-V AC input. The controller uses primary-side regulation (PSR) and detects a wake-up signal from the UCC24650 secondary-side voltage-droop (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Efficiency 300W AC/DC Power Supply Reference Design
PMP20367 — PMP20367 is high-efficiency AC/DC power supply reference design with universal AC input and 55V/5.5A and 12V/1A outputs. LLC+PFC combo IC UCC29950 is applied for the main power stages with 55V/5.5A output while UCC28730 is applied for the auxiliary power with 12V/1A output.  This design has (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
5V/20W PSR Flyback with CCCV Regulation and Cable Compensation Reference Design
PMP11500 — This reference design is a 120Vac to 5V primary side regulated flyback converter with synchronous rectification on the secondary side. PMP11500 has built in cable compensation  which adjusts the regulation set point to offset the resistance in long cables. The reference design has extremely low (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
12V/12W PSR Flyback Reference Design
PMP20634 — The PMP20634 reference design is an isolated DCM flyback design that takes a universal line input 85VAC to 265VAC, and produces a 12V ouput capable of 12W loading. The design uses the UCC28730 controller that achieves ultra-low standby power at no load. It achieves 85% efficiency at high and low (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
80V/50W Upside-Down Buck Reference Design
PMP20686 — This UCC28730 based upside-down buck design converts a universal line input to a non-isolated 80V/50W output. An additional 12V/600mW output is produced using a UCC28880. The design achieves over 93% efficiency and consumes less than 50mW of standby power.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
85 to 265Vac In, 48V1A Out Power Supply for STB with <75mW Standby Power Reference Design
PMP40025 — The PMP40025 is a universal AC input, 48W output flyback converter based on primary side regulation(PSR) which eliminates optocouplers and secondary side feedback components reducing BOM cost. The design features a single 48V/1A output with average efficiency greater than 89% and 75mW no load power (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Efficiency 350W AC/DC Power Supply Reference Design
PMP11303 PMP11303 is high-efficiency AC/DC power supply reference design with universal AC input and 25V/13.5A and 12V/1A outputs. LLC+PFC combo IC UCC29950 is applied for the main power stages with 25V/13.5A output while UCC28730 is applied for the auxiliary power with 12V/1A output. This design has low no (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
USB-C DFP, 5V/3A Out, Universal AC Input Reference Design
PMP11295 — This power reference design provides 5V/15W over USB-C from a universal AC input range of 85-265VAC. The UCC24636 synchronous rectifer driver and CSD18540Q5B MOSFET allow this design to provide 84% average efficiency. The TPS25810 provides the PD port control over the USB-C output connector.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
120VAC Input, High Efficiency 12V/50W Power Supply Reference Design
PMP11368 The PMP11368 power reference design provides 50W of load power from a standard 120VAC input with greater than 90% efficiency.  The UCC27714 integrates the drive for the high-side MOSFET, while the UCC24636 drives the synchronous rectifer.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal AC Input, 5V/10A/50W PSR Flyback Power Supply W/over 88% Avg Efficiency Reference Design
PMP11281 PMP11281 is a quasi-resonant Flyback power suppy based on the UCC28730 primary side regulation (PSR) controller. The elimination of optocoupler using PSR topology promises higher reliability and lower system cost. The design achieves less than 40mW standby power losses and over 88% average (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal AC Input 5V/6A/30W PSR Flyback Power Supply Reference Design w/Over 89.5% Avg Efficiency
PMP11232 — PMP11232 is a quasi-resonant Flyback power suppy based on the UCC28730 primary side regulation (PSR) controller. The elimination of optocoupler using PSR topology promises higher reliability and lower system cost. The design achieves less than 40mW standby power losses and over 89.5% average (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal AC Input 5V/10A/50W PSR Flyback Power Supply With Over 89% Avg Efficiency Reference Design
PMP10974 PMP10974 is a quasi-resonant Flyback power suppy based on the UCC28730 primary side regulation (PSR) controller. The elimination of optocoupler using PSR topology promises higher reliability and lower system cost. The design achieves less than 40mW standby power losses and over 89% average (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal AC Input, 5V/10A/50W PSR Flyback Power Supply W/Rapid Load Transient Response Ref Design
PMP10407 PMP10407 is a quasi-resonant Flyback power suppy based on the UCC28730 primary side regulation (PSR) controller demonstrating the use of wake up device UCC24650 to achieve rapid load transient response from light load condition when the system is under low frequency operation. The elimination of (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
24V/12W Off-Line DCM Flyback Converter Optimized for Zero-Power at No-Load
PMP10927 This design features the UCC28730 flyback controller in conjunction with the UCC24650 Wake-Up monitor to provide CV, CC regulated output with ultra-low stand-by power that exceeds Level VI and CoC Tier 2 specifications for average efficiency and 10% load efficiency.  Wake-up signal detection (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
5V/10W Off-Line DCM Flyback Converter Optimized for Zero-Power at No-Load - Reference Design
PMP9561 This design features the UCC28730 flyback controller in conjunction with the UCC24650 wake-up monitor to provide CV, CC regulated output with ultra-low stand-by power that exceeds Level VI and CoC Tier 2 specifications for average efficiency and 10% load efficiency.  Wake-up signal detection (...)
document-generic Schematic document-generic User guide

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Package Pins Download
SOIC (D) 7 View options

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