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Product details

Parameters

Control method Secondary-side regulation Duty cycle (Max) (%) 80 Frequency (Max) (kHz) 1000 UVLO thresholds on/off (V) 20/7.25 Features SSR, DCM, CCM, Frequency Synchronization Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Flyback controllers

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Flyback controllers

Features

  • 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
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Description

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

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 5
Type Title Date
* Datasheet LM5021 AC-DC Current-Mode PWM Controller datasheet (Rev. E) Dec. 24, 2014
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles Power Tips: Design considerations of high-voltage converters in a cascode MOSFET Nov. 03, 2015
Application note AN-2102 LM3464 and LM5021 DHC 25W Reference Designs (Rev. A) May 01, 2013
User guide Load Detecting Power Supply User Guide Jan. 27, 2012

Design & development

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

Design tools & simulation

SIMULATION MODEL Download
SNVM012.ZIP (623 KB) - PSpice Model
SIMULATION MODEL Download
SNVM452.ZIP (18 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVM453.TSC (552 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVM454.TSC (552 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVM455.ZIP (19 KB) - TINA-TI Spice Model
CAD/CAE SYMBOL Download
SNVC021.ZIP (458 KB)

Reference designs

Many TI reference designs include the LM5021 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

Package Pins Download
PDIP (P) 8 View options
VSSOP (DGK) 8 View options

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