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Overview
| Topology | Flyback Converter |
| Input voltage | 400 V |
| Switching frequency | 135-560 kHz |
| Output 1 | 36 V / 4 A |
| IC revision | D |
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
- 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
- Isolated Telecom Power SuppliesIsolated Telecom Power Supplies
- Audio Amplifiers
- Industrial Power Conversion
- SMPS for Smart Meters
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | Size | Operating Temperature | DF(%) | RISO | Ceramic Type | Fl(mm) | Packaging | ISAT(A) | fres(MHz) | Version | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | IR(A) | L(mH) | RDC max.(mΩ) | VR(V (DC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 50 V(DC), 1 µF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance1 µF | Capacitance±10% | Size0805 | Operating Temperature -55 °C up to +125 °C | Dissipation Factor10 % | Insulation Resistance0.1 GΩ | Ceramic TypeX7R Class II | Pad Dimension0.5 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | Rated Voltage50 V (DC) | – | – | Length2 mm | Width1.25 mm | Height1.25 mm | – | |||||
 | WE-CMB Common Mode Power Line Choke, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMB Common Mode Power Line Choke | – | – | SizeL | Operating Temperature -40 °C up to +125 °C | – | – | – | – | – | – | – | VersionTHT | – | – | – | Rated Current4 A | Inductance3.3 mH | DC Resistance35 mΩ | Rated Voltage250 V (DC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length27.5 mm | Width18.5 mm | Height33 mm | MountTHT | ||||
 | WE-FI Leaded Toroidal Line Choke, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-FI Leaded Toroidal Line Choke | – | – | – | Operating Temperature -40 °C up to +105 °C | – | – | – | – | – | – | – | – | – | – | – | Rated Current8 A | Inductance0.029 mH | DC Resistance15 mΩ | – | – | – | Length19 mm | Width11.1 mm | – | MountTHT | |||
 | WE-SPC SMT Power Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-SPC SMT Power Inductor | – | – | Size4838 | Operating Temperature -40 °C up to +125 °C | – | – | – | – | – | Saturation Current1.4 A | Self Resonant Frequency19 MHz | VersionSMT | – | – | – | Rated Current1.1 A | Inductance0.022 mH | DC Resistance213 mΩ | – | – | – | Length4.8 mm | Width4.8 mm | Height3.8 mm | MountSMT | ||||
 | WE-PD2 SMT Power Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 SMT Power Inductor | – | – | Size4532 | Operating Temperature -40 °C up to +125 °C | – | – | – | – | – | Saturation Current2.46 A | Self Resonant Frequency50 MHz | – | Performance Rated Current2.6 A | Saturation Current @ 10%2.9 A | Saturation Current @ 30%3.3 A | Rated Current1.82 A | Inductance0.0047 mH | DC Resistance110 mΩ | – | – | – | Length4 mm | Width4.5 mm | Height3.2 mm | MountSMT | ||||
 | WE-TI Radial Leaded Wire Wound Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TI Radial Leaded Wire Wound Inductor | – | – | Size8055 | Operating Temperature -40 °C up to +125 °C | – | – | – | – | – | Saturation Current0.9 A | Self Resonant Frequency9.4 MHz | VersionHeat Shrinking Tube | – | Saturation Current @ 10%1.2 A | Saturation Current @ 30%1.4 A | Rated Current1.1 A | Inductance0.1 mH | DC Resistance1000 mΩ | – | – | – | Length8.5 mm | Width8.5 mm | Height5.5 mm | MountTHT | ||||
 | 750315797 | Inductor, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Inductor | – | – | SizePQ3230 | Operating Temperature -40 °C up to +125 °C | – | – | – | – | PackagingTray | Saturation Current15 A | – | – | – | – | – | – | Inductance0.35 mH | – | – | – | – | Length35.56 mm | Width37.34 mm | Height34.29 mm | MountTHT | ||
 | 7508110338 | Offline Transformer, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Offline Transformer | – | – | SizeEE16/8/5 | – | – | – | – | – | – | Saturation Current0.325 A | – | – | – | – | – | – | Inductance1.5 mH | – | – | Insulation Test Voltage4000 V (AC) | – | Length20.32 mm | Width24.38 mm | Height16 mm | MountTHT |