UCC28712

ACTIVE

Constant-voltage, constant-current PWM with PSR, valley switching, NTC option, and 150mV cable comp.

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Product details

Parameters

Control method Primary-side regulation Duty cycle (Max) (%) 99 Frequency (Max) (kHz) 100 UVLO thresholds on/off (V) 21/8 Features PSR, DCM, HV Start-up, Green Mode, Input Line Monitor, Leading Edge Blanking, Light Load Efficiency, Low Power, 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

  • < 10-mW No-Load Power
  • Primary-Side Regulation (PSR) Eliminates Opto-Coupler
  • ±5% Voltage and Current Regulation Across Line and Load
  • 700-V Start-Up Switch
  • 100-kHz Maximum Switching Frequency Enables High-Power Density Charger Designs
  • Resonant Valley-Switching Operation for Highest Overall Efficiency
  • Frequency Jitter to Ease EMI Compliance
  • Wide VDD Range Allows Small Bias Capacitor
  • Clamped Gate-Drive Output for MOSFET
  • Overvoltage, Low-Line, and Overcurrent Protection Functions
  • Programmable Cable Compensation (UCC28710)
  • NTC Resistor Interface (UCC28711, UCC28712 and UCC28713) with Fixed Cable Compensation Options
  • SOIC-7 Package
  • Create a Custom Design Using the UCC28710 With the WEBENCH® Power Designer

All trademarks are the property of their respective owners.

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Description

The UCC2871x family of flyback power supply controllers provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.

An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28710 family allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controllers have a maximum switching frequency of 100 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28710 allow the cable compensation to be programmed. The UCC28711, UCC28712 and UCC28713 devices allow remote temperature sensing using a negative temperature coefficient (NTC) resistor while providing fixed cable-compensation levels.

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Technical documentation

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Type Title Date
* Datasheet UCC2871x Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. C) Jun. 30, 2017
Application notes Minimize Standby Consumption for UCC287XX Family Aug. 01, 2019
Application notes Choosing Standard Recovery Diode or Ultra-Fast Diode in Snubber Oct. 09, 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
More literature Exposing the Inner Behavior of a Quasi-Resonant Flyback Converter Oct. 29, 2013

Design & development

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

Design tools & simulation

SIMULATION MODELS Download
SLUM464.ZIP (17619 KB) - PSpice Model
SIMULATION MODELS Download
SLUM538.ZIP (119 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SLUM539.TSC (224 KB) - TINA-TI Reference Design
CALCULATION TOOLS Download
SLUC590.ZIP (95 KB)

CAD/CAE symbols

Package Pins Download
SOIC (D) 7 View options

Ordering & quality

Support & training

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Videos

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This is a qualitative overview of the control of Switched Mode Power Supplies.

Posted: 08-Jan-2019
Duration: 18:59

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