Product details

Control mode Secondary-side regulation Frequency (Max) (kHz) 130 UVLO thresholds on/off (V) 12.8/7.5 Duty cycle (Max) (%) 100 Features Quasi-Resonant, SSR, Green Mode, Light Load Efficiency, Leading Edge Blanking, CrCM, OVP Operating temperature range (C) -40 to 125 Rating Catalog Device type Controllers Topology Flyback
Control mode Secondary-side regulation Frequency (Max) (kHz) 130 UVLO thresholds on/off (V) 12.8/7.5 Duty cycle (Max) (%) 100 Features Quasi-Resonant, SSR, Green Mode, Light Load Efficiency, Leading Edge Blanking, CrCM, OVP Operating temperature range (C) -40 to 125 Rating Catalog Device type Controllers Topology Flyback
VSSOP (DGK) 8 15 mm² 3 x 4.9
  • 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
  • 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

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.

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

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Type Title Date
* Data sheet LM5023 AC-DC Quasi-Resonant Current Mode PWM Controller datasheet (Rev. E) 06 Jan 2016
White paper Power Electronics in Motor Drives: Where is it? (Rev. A) 01 Oct 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
User guide Using the UCC24630EVM-636 65-W AC-to-DC Adapter (Rev. B) 12 Dec 2016
More literature Design review of a 2-kW parallelable power supply module 17 Aug 2016
More literature Design review of a 2-kW parallelable power supply module (PPT) 17 Aug 2016
More literature Exposing the Inner Behavior of a Quasi-Resonant Flyback Converter 29 Oct 2013
Test report PMP8655 Test Results 11 Oct 2013
Technical article Isolated power supplies – Is analog dead? 24 Sep 2013
Technical article APEC - hot and cool 20 Mar 2013
Application note LM5023-2EVM Notebook Adapter 12 Feb 2013
More literature LM5023 Product Bulletin 08 Feb 2013

Design & development

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

Evaluation board

LM5023-2NBEVM — LM5023 19V 65W Notebook Adapter Evaluation Module

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.

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Limit: 3
Evaluation board

UCC24630EVM-636 — UCC24630 65W AC/DC Adapter

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.

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Limit: 5
Evaluation board

UCC28740EVM-525 — UCC28740EVM-525 Evaluation Module

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 (...)

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Limit: 3
Simulation model

LM5023 Unencrypted PSpice Transient Model Package (Rev. A)

SNVM463A.ZIP (46 KB) - PSpice Model
Simulation model

LM5023 TINA-TI Transient Reference Design

SNVM471.TSC (1447 KB) - TINA-TI Reference Design
Simulation model

LM5023 TINA-TI Transient Spice Model

SNVM472.ZIP (23 KB) - TINA-TI Spice Model
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