AC-DC Quasi-Resonant Current Mode PWM Controller - LM5023


AC-DC Quasi-Resonant Current Mode PWM 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.


  • 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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Parametrics Compare all products in Flyback Controller

Control Method
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Special Features
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
LM5023 UCC28600 UCC28610 UCC28740
Current    Current    Current    Current   
100    99    100    99   
130    130    130    100   
12.8/7.5    10.3/9.3    10.2/8    21/7.75   
HV Start-up Configurable
Green Mode
Light Load Efficiency
Power Delivery Compatible   
Error Amplifier
Green Mode
Light Load Efficiency
Power Delivery Compatible
Motor Drive Compatible
Audio Compatible   
HV Start-up
Soft Switching
Power Delivery Compatible
Audio Compatible
Motor Drive Compatible   
HV Start-up
CV/CC Control
Smart Meters Compatible
IoT Compatible
USB Type-C Compatible
Power Delivery Compatible   
-40 to 125    -40 to 105    -40 to 125    -40 to 125   
Catalog    Catalog    Catalog    Catalog   
8VSSOP: 15 mm2: 4.9 x 3(VSSOP)    8SOIC: 29 mm2: 6 x 4.9(SOIC)    See datasheet (PDIP)    7SOIC: 29 mm2: 6 x 4.9(SOIC)   

WEBENCH® Designer LM5023

 AC  DC  
AC Frequency  60 Hz  50 Hz
Use Isolated Output?
  Min   Max Range
VinRMS  V 85.00 to 265.00V
Vout  V 5.0 to 24.0V
Iout  A ≤ 5.0A
Ambient Temp  °C -40 to 125°C