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LM5021

ACTIVE

30V, 1MHZ current mode PWM controller

Product details

Control mode Secondary-side regulation UVLO thresholds on/off (V) 20/7.25 Duty cycle (max) (%) 80 Switching frequency (max) (kHz) 1000 Features CCM, DCM, Frequency synchronization, Leading edge blanking, Secondary-side regulated, Skip cycle mode, Slope compensation Operating temperature range (°C) -40 to 125 Rating Catalog Device type Controllers Topology Flyback, Forward
Control mode Secondary-side regulation UVLO thresholds on/off (V) 20/7.25 Duty cycle (max) (%) 80 Switching frequency (max) (kHz) 1000 Features CCM, DCM, Frequency synchronization, Leading edge blanking, Secondary-side regulated, Skip cycle mode, Slope compensation Operating temperature range (°C) -40 to 125 Rating Catalog Device type Controllers Topology Flyback, Forward
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Ultra Low Start-up Current (25 µA maximum)
  • Current Mode Control
  • Skip Cycle Mode for Low Standby Power
  • Single Resistor Programmable Oscillator
  • Synchronizable Oscillator
  • Adjustable Soft-Start
  • Integrated 0.7 A Peak Gate Driver
  • Direct Opto-Coupler Interface
  • Maximum Duty Cycle Limiting (80% for LM5021-1
    or 50% for LM5021-2)
  • Slope Compensation (LM5021-1 Only)
  • Under Voltage Lockout (UVLO) with Hysteresis
  • Cycle-by-Cycle Over-Current Protection
  • Hiccup Mode for Continuous Overload Protection
  • Leading Edge Blanking of Current Sense Signal
  • Packages: VSSOP-8 or PDIP-8
  • Ultra Low Start-up Current (25 µA maximum)
  • Current Mode Control
  • Skip Cycle Mode for Low Standby Power
  • Single Resistor Programmable Oscillator
  • Synchronizable Oscillator
  • Adjustable Soft-Start
  • Integrated 0.7 A Peak Gate Driver
  • Direct Opto-Coupler Interface
  • Maximum Duty Cycle Limiting (80% for LM5021-1
    or 50% for LM5021-2)
  • Slope Compensation (LM5021-1 Only)
  • Under Voltage Lockout (UVLO) with Hysteresis
  • Cycle-by-Cycle Over-Current Protection
  • Hiccup Mode for Continuous Overload Protection
  • Leading Edge Blanking of Current Sense Signal
  • Packages: VSSOP-8 or PDIP-8

The LM5021 off-line pulse width modulation (PWM) controller contains all of the features needed to implement highly efficient off-line single-ended flyback and forward power converters using current-mode control. The LM5021 features include an ultra-low (25 µA) start-up current, which minimizes power losses in the high voltage start-up network. A skip cycle mode reduces power consumption with light loads for energy conserving applications (ENERGY STAR®, CECP, and so forth). Additional features include under-voltage lockout, cycle-by-cycle current limit, hiccup mode overload protection, slope compensation, soft-start and oscillator synchronization capability. This high performance 8-pin IC has total propagation delays less than 100 ns and a 1-MHz capable oscillator that is programmed with a single resistor.

The LM5021 off-line pulse width modulation (PWM) controller contains all of the features needed to implement highly efficient off-line single-ended flyback and forward power converters using current-mode control. The LM5021 features include an ultra-low (25 µA) start-up current, which minimizes power losses in the high voltage start-up network. A skip cycle mode reduces power consumption with light loads for energy conserving applications (ENERGY STAR®, CECP, and so forth). Additional features include under-voltage lockout, cycle-by-cycle current limit, hiccup mode overload protection, slope compensation, soft-start and oscillator synchronization capability. This high performance 8-pin IC has total propagation delays less than 100 ns and a 1-MHz capable oscillator that is programmed with a single resistor.

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Technical documentation

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Type Title Date
* Data sheet LM5021 AC-DC Current-Mode PWM Controller datasheet (Rev. E) PDF | HTML 24 Dec 2014
Functional safety information LM5021 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 12 Sep 2022
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Power Tips: Design considerations of high-voltage converters in a cascode MOSFET PDF | HTML 03 Nov 2015
Application note AN-2102 LM3464 and LM5021 DHC 25W Reference Designs (Rev. A) 01 May 2013
User guide Load Detecting Power Supply User Guide 27 Jan 2012

Design & development

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

Simulation model

LM5021 Unencrypted PSpice Transient Model

SNVM012.ZIP (623 KB) - PSpice Model
Simulation model

LM5021-1 TINA-TI Transient Reference Design

SNVM454.TSC (552 KB) - TINA-TI Reference Design
Simulation model

LM5021-1 TINA-TI Transient Spice Model

SNVM455.ZIP (19 KB) - TINA-TI Spice Model
Simulation model

LM5021-2 TINA-TI Transient Reference Design

SNVM453.TSC (552 KB) - TINA-TI Reference Design
Simulation model

LM5021-2 TINA-TI Transient Spice Model

SNVM452.ZIP (18 KB) - TINA-TI Spice Model
CAD/CAE symbol

Load Detecting Power Supply CAD Files

SNVC021.ZIP (458 KB)

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PDIP (P) 8 View options
VSSOP (DGK) 8 View options

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