LM5023

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AC-DC quasi-Resonant current mode PWM controller

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Product details

Parameters

Control method Secondary-side regulation Duty cycle (Max) (%) 100 Frequency (Max) (kHz) 130 UVLO thresholds on/off (V) 12.8/7.5 Features Quasi-Resonant, SSR, Green Mode, Light Load Efficiency Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Flyback controllers

Package | Pins | Size

VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Flyback controllers

Features

  • Critical Conduction Mode
  • Peak-Current Mode Control
  • Skip-Cycle Mode for Low-Standby Power
  • Hiccup Mode for Continuous Overload Protection
  • Cycle-by-Cycle Overcurrent Protection Maintains
    Accuracy Over the Universal AC Line
  • Line-Voltage Feedforward
  • OVP Protection by Sensing the Auxiliary Winding
  • Integrated 0.7-A Peak Gate Driver
  • Direct Opto-Coupler Interface
  • Leading Edge Blanking of Current Sense Signal
  • Maximum Frequency Clamp 130 kHz
  • Programmable Soft-Start
  • Thermal Shutdown
  • 8-Pin VSSOP Package
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Description

The LM5023 is a quasi-resonant pulse width modulated (PWM) controller which contains all of the features needed to implement a highly efficient off-line power supply. The LM5023 uses the transformer auxiliary winding for demagnetization detection to ensure critical conduction mode (CrCM) operation. The LM5023 features a hiccup mode for overcurrent protection with an auto restart to reduce the stress on the power components during an overload. A skip-cycle mode reduces power consumption at light loads for energy conservation applications (ENERGY STAR®, CEPCP, and so forth). The LM5023 also uses the transformer auxiliary winding for output overvoltage protection (OVP); if an OVP fault is detected the LM5023 latches off the controller.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 12
Type Title Date
* Datasheet LM5023 AC-DC Quasi-Resonant Current Mode PWM Controller datasheet (Rev. E) Jan. 06, 2016
White paper Power Electronics in Motor Drives: Where is it? (Rev. A) Oct. 01, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
User guide Using the UCC24630EVM-636 65-W AC-to-DC Adapter (Rev. B) Dec. 12, 2016
More literature Design review of a 2-kW parallelable power supply module Aug. 17, 2016
More literature Design review of a 2-kW parallelable power supply module (PPT) Aug. 17, 2016
More literature Exposing the Inner Behavior of a Quasi-Resonant Flyback Converter Oct. 29, 2013
User guide PMP8655 Test Results Oct. 11, 2013
Technical articles Isolated power supplies – Is analog dead? Sep. 24, 2013
Technical articles APEC - hot and cool Mar. 20, 2013
Application note LM5023-2EVM Notebook Adapter Feb. 12, 2013
More literature LM5023 Product Bulletin Feb. 08, 2013

Design & development

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

Hardware development

EVALUATION BOARD Download
49
Description

The Texas Instruments LM5023-2NBEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM5023 AC-DC Quasi-Resonant Current Mode PWM Controller. This is a 65W evaluation modules for off-line notebook adapter applications.

Features
  • Standby power <30mW
  • Output voltage regulation <1%
  • Efficiency >88%
EVALUATION BOARD Download
UCC24630 65W AC/DC Adapter
UCC24630EVM-636
99
Description

This is a high efficiency 65W AC/DC design using UCC24630 Synchronous Rectification Controller for a Universal input (85Vac to 265Vac) to 19.5V @3.33A output exceeding CoC-5 Tier2 and DOE Level VI performance requirements for external power supplies.

Features
  • 91.49% @115V AC, 89.81% @230V AC 4-point average efficiency 
  • 83.14% @120V AC, 82.24% @230V AC 10% load efficiency
  • 59mW No load Power consumption at 230V AC
  • Fast turn-on time
  • <80mV output voltage ripple
  • AC line input UVLO protection
EVALUATION BOARD Download
49
Description

The UCC28740EVM-525 evaluation module is a 10W off-line discontinuous mode (DCM) flyback converter that provides constant-voltage (CV) and constant-current (CC) output regulation. It uses optical coupler feedback for tight voltage regulation and improved the transient response to large load steps (...)

Features
  • Universal AC input, 5V/2.1A output
  • <20mW no load power
  • Avg. efficiency > 80%
  • Opto-Coupled Feedback for Constant Voltage Regulation and Fast Dynamic Response
  • Primary Side Control for Tight Constant Current Performance (± 5% Output Current Regulation)
  • Internal 700V Start-Up Switch to Start up the Supply (...)

Design tools & simulation

SIMULATION MODEL Download
SNVM463A.ZIP (46 KB) - PSpice Model
SIMULATION MODEL Download
SNVM471.TSC (1447 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVM472.ZIP (23 KB) - TINA-TI Spice Model

Reference designs

Many TI reference designs include the LM5023 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options

Ordering & quality

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