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reference designLM5023

Texas Instruments LM5023

AC-DC Quasi-Resonant Current Mode PWM Controller

Overview

TopologyOther Topology
IC revisionD

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 (CCM) operation. The LM5023 features a hiccup mode for over current protection with an auto restart to reduce the stress on the power components during an overload. A skip cycle mode which reduces power consumption at light loads for energy conservation applications (ENERGY STAR®, CEPCP, etc.). The LM5023 also uses the transformer auxiliary winding for output overvoltage (OVP) protection, if an OVP fault is detected the LM5023 latches off the controller.

Features

  • Critical Conduction Mode
  • Peak Current Mode Control Mode
  • Skip Cycle Mode for Low Standby Power
  • Hiccup Mode for Continuous Overload Protection
  • Cycle-by-Cycle Over-Current Protection MaintainsAccuracy over the Universal AC Line
  • Line Current Feed Forward
  • OVP Protection by Sensing the Aux 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 MSOP Package

Typical applications

  • Universal Input AC-DC Notebook Adapters 10 W to 65 W
  • Consumer Electronics
  • High Efficiency Housekeeping and Auxiliary Power
  • Battery Chargers

More information

Parts approved by Texas Instruments

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IR(A)
L1(mH)
RDC max.(Ω)
VR(V (AC))
VT(V (AC))
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74466340007
SPECWE-LF SMD Common Mode Power Line Choke in SMT, 5.25 A, 0.7 mH
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Downloads11 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-LF SMD Common Mode Power Line Choke in SMT
Rated Current5.25 A
Inductance [1]0.7 mH
DC Resistance [1]0.03 Ω
Rated Voltage250 V (AC)
Insulation Test Voltage1500 V (AC)
MaterialMnZn 
Length23.3 mm
Width18.5 mm
Height11.5 mm
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