LM5021-Q1

ACTIVE

Automotive 30V, 1MHz current mode PWM controller

Product details

Operating temperature range (°C) -40 to 125 Control mode Secondary-side regulation Topology Flyback, Forward Rating Automotive Features Automotive qualified, CCM, DCM, Frequency synchronization, Leading edge blanking, Secondary-side regulated, Skip cycle mode Duty cycle (max) (%) 80
Operating temperature range (°C) -40 to 125 Control mode Secondary-side regulation Topology Flyback, Forward Rating Automotive Features Automotive qualified, CCM, DCM, Frequency synchronization, Leading edge blanking, Secondary-side regulated, Skip cycle mode Duty cycle (max) (%) 80
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C
      Ambient Operating Temperature Range
    • Device HBM Classification Level 2: ±2 kV
    • Device CDM Classification Level C4B: 750 V
  • 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
  • Package: VSSOP-8
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C
      Ambient Operating Temperature Range
    • Device HBM Classification Level 2: ±2 kV
    • Device CDM Classification Level C4B: 750 V
  • 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
  • Package: VSSOP-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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* Data sheet LM5021-Q1 AC-DC Current-Mode PWM Controller datasheet PDF | HTML 17 Dec 2014
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018

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
Package Pins CAD symbols, footprints & 3D models
VSSOP (DGK) 8 Ultra Librarian

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