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reference designLM5021 | Demoboard PMP10129

Texas Instruments LM5021 | Demoboard PMP10129

LM5021 AC-DC Current Mode PWM Controller

Overview

TopologyFlyback Converter
Input voltage90-460 V
Switching frequency135-560 kHz
Output 16 V / 1.5 A
Output 224 V / 0.5 A
IC revisionB

Description

The LM5021 off-line pulse width modulation (PWM) controller contains all of the features needed to implement highly efficient off-line single-endedflyback and forward power converters using currentmode 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, etc.). Additional features includeunder-voltage lockout, cycle-by-cycle current limit, hiccup mode overload protection, slope com- pensation, soft-start and oscillator synchronizationcapability. This high performance 8-pin IC has total propagation delays less than 100nS and a 1MHz capable oscillator that is programmed with a singleresistor.

Features

Remark: BOM and Schematics are added with main pdf.

  • 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 0.7A Peak Gate Driver
  • Direct Opto-Coupler Interface
  • Maximum Duty Cycle Limiting (80% for LM5021-1 or 50% for LM5021-2)
  • Slope Compensation for (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

Typical applications

  • Building Automation and White Goods SMPS
  • SMPS for Smart Meters
  • Industrial Power Conversion
  • Isolated Telecom Power SuppliesIsolated Telecom Power Supplies
  • Audio Amplifiers

More information

Products

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Data­sheet
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Product series
L(µH)
IR(A)
ISAT,10%(A)
RDC max.(Ω)
fres(MHz)
Version
SamplesAvailability & Sample
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750315315
SPECFlyback Transformer, 400 µH, –
Simu­lation
Availability
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Downloads4 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product series Flyback Transformer
Inductance400 µH
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7447480102
SPECWE-TI Radial Leaded Wire Wound Inductor, 1000 µH, 0.8 A
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-TI Radial Leaded Wire Wound Inductor
Inductance1000 µH
Rated Current0.8 A
Saturation Current @ 10%0.9 A
DC Resistance1.15 Ω
Self Resonant Frequency1.1 MHz
VersionStandard 
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