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

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No results found. Please clear your search and try again. View all 11
Type Title Date
* Datasheet LM5023 AC-DC Quasi-Resonant Current Mode PWM Controller datasheet (Rev. E) Jan. 06, 2016
White papers Power Electronics in Motor Drives: Where is it? (Rev. A) Oct. 01, 2019
User guides 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 guides 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 notes 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 BOARDS Download
$49.00
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 BOARDS Download
UCC24630 65W AC/DC Adapter
UCC24630EVM-636
document-generic User guide
$99.00
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 BOARDS Download
document-generic User guide
$49.00
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 MODELS Download
SNVM463A.ZIP (46 KB) - PSpice Model
SIMULATION MODELS Download
SNVM471.TSC (1447 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM472.ZIP (23 KB) - TINA-TI Spice Model

Reference designs

REFERENCE DESIGNS Download
2-kW industrial AC/DC battery charger reference design with 92% full-load efficiency
PMP8740 — This reference design is a module that can be set as standard power supply or a battery charger. The output voltage ranges from 0 V to 32 V at a maximum current of 62.5 A. It consists of four boards, a boost PFC, a phase shift full bridge, a small daughter board (hosting the microcontroller), and a (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
95VAC-130VAC to 24V/72W Flyback Reference Design
PMP20815 — The PMP20815 reference design is a DCM Flyback with Optocoupler feedback. It operates at a 130kHz switching frequency to reduce transformer size. The reference design converts low-line AC mains to a 24V/72W output at 91% efficiency.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
65W High-efficiency CoC-5 tier2/DOE Level VI AC Adapter
TIDA-00519 This is a high efficiency 65W AC/DC design for a Universal input (85Vac to 265Vac) to 19.5V @3.33A output exceeding CoC-5 Tier2 and DOE Level VI requirements for external power supplies using the LM5023 Quasi-Resontant Flyback Controller with UCC24630 Synchronous Rectification Controller and (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Two Elements Lead-Acid 16V…32V@2A Battery Charger from 170VAC to 270VAC Reference Design
PMP30047 — A quasi-resonant isolated flyback is employed to charge two lead-acid battery elements, starting from high-line mains. The converter accepts two external signals (referred to secondary side) to provide the reference voltages, which set output voltage and current. The converter shows good wide-range (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Offline AC/DC 120W Multi-Output Flyback Power Supply Reference Design
PMP4408 The PMP4408 is a universal AC input, 120W flyback converter reference design. The LM5023 Quasi Resonant Flyback converter was chosen to get 2 high-efficiency isolated outputs. Additionally a downstream Buck converter, the TPS5402 enables 2 high-efficiency non-isolated outputs. The QR Flyback design (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
AC Offline Converter Providing 5VDC or 12VDC Output at 2A
PMP7883 — The following design, driven by the LM5023, takes an AC input, like the ones located in the common US power outlet, and generates 5V/12V out, 2A DC signal, outputs commonly used for USB connections.
Design files
REFERENCE DESIGNS Download
High and Wide AC Vin Quasi-Resonant Isolated Flyback Reference Design
PMP7991 PMP7991 is a quasi-resonant isolated flyback using the LM5023 controller IC. The design accepts an input voltage of 85VAC to 265VAC and provides a selectable output of 12Vout or 5Vout capable of supplying 2A of current to the load. The quasi-resonant switching scheme helps to reduce EMI.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Universal Input 3.8W Quasi-Resonant Flyback using LM5023 Reference Design
PMP8650 This reference design uses the LM5023 quasi-resonant flyback controller to generate isolated 3.16V and 13V outputs from an universal input. The regulated 3.16V output provides up to 620mA of output current, while the unregulated 13V output is capable of providing up to 135mA.
document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
Offline AC/DC 75W Quasi-Resonant Flyback Converter Reference Design
PMP10100 The PMP10100 reference design uses the LM5023 flyback controller for the Quasi-Resonant Flyback Topology. It generates an isolated output (19.5V@3.84A) from an universal input (85VAC - 265VAC).
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Offline AC/DC 75W 2-Switch Quasi-Resonant Flyback Converter Reference Design
PMP10035 This design uses the LM5023 flyback controller for the 2-Switch Quasi-Resonant Flyback Topology. It generates an isolated output (19.5V@3.84A) from an universal input (85VAC - 265VAC).
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Programmable output Constant Voltage - Constant Current (CVCC) Quasi-Resonant Flyback charger
PMP8955 This industrial charger reference design uses the LM5023 Quasi-Resonant Flyback controller to implement a 120VAC input design with CVCC output configured by microcontroller PWM control from 10 to 22.5V and output current from 200mA to 2A.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
50W Multi-Rail AC/DC Power Supply for PLC Applications - Reference Design
PMP4419 The PMP4419 is a fully tested multi-rail AC/DC power supply reference design for industrial applications like Programmable Logic Controllers (PLC).  The input range is 90Vac to 264Vac, and the DC outputs are 24V/1A and +/-15V/0.6A respecitivley with excellent cross-regulation (<5%).  (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
144 to 253VAC Vin 10.5W Quasi-Resonant Flyback Reference Design
PMP8735 The PMP8735 reference design uses the LM5023 quasi-resonant flyback controller to generate 5V@2.1A from an input voltage of 144VAC to 253VAC.
Design files
REFERENCE DESIGNS Download
195 to 265VAC Vin 50W Quasi-Resonant Synchronous Flyback Reference Design
PMP8677 The PMP8677 reference design uses the LM5023 quasi-resonant flyback controller to generate 12V@4.2A. The full load efficiency is more than 91% for low and high line.
Design files
REFERENCE DESIGNS Download
Low Standby Power Quasi-Resonant Isolated Flyback 90 to 265VACin 24V@0.7A Reference Design
PMP8655

The PMP8655 reference design uses the LM5023 quasi-resonant flyback controller to generate 24V@0.7A output from an universal input. Particular attention to light load efficiency resulted in more than 82% efficiency for 1W output power and 90VAC input. In addition, the valley switching of the LM5023 (...)

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options

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