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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
- Audio Amplifiers
- Isolated Telecom Power SuppliesIsolated Telecom Power Supplies
- SMPS for Smart Meters
- Industrial Power Conversion
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | VIN | VOut1 (V) | IOut1 (A) | Vaux (V) | fswitch (kHz) | NPRI : NSEC : NAUX | ISAT (mA) | Size | C | Tol. C | Operating Temperature | DF (%) | RISO | Ceramic Type | Fl (mm) | Packaging | fres (MHz) | Version | IR (A) | L (mH) | RDC max. (mΩ) | VR (V (AC)) | VT (V (AC)) | Material | L (mm) | W (mm) | H (mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 7508110338 | SPEC | 4 files | MID-OLTI Offline Flyback Transformers for Texas Instruments | 85 - 265 V (AC) | 12 | 0.5 | 24 | 100 | 7.82:1:2 | 325 | EE16/8/5 | – | – | – | – | – | – | – | – | – | – | – | 1.5 | – | – | 4000 | – | 20.32 | 24.38 | 16 | THT | ||
 | 744824433 | SPEC | 10 files | WE-CMB Common Mode Power Line Choke | – | – | – | – | – | – | – | L | – | – | -40 °C up to +125 °C | – | – | – | – | – | – | THT | 4 | 3.3 | 35 | 250 | 1500 | MnZn | 27.5 | 18.5 | 33 | THT | ||
 | 7447016 | SPEC | – | 6 files | WE-FI Leaded Toroidal Line Choke | – | – | – | – | – | – | – | – | – | – | -40 °C up to +105 °C | – | – | – | – | – | – | – | 8 | 0.029 | – | – | – | – | 19 | 11.1 | – | – | |
 | 74408943220 | SPEC | 8 files | WE-SPC SMT Power Inductor | – | – | – | – | – | – | 1400 | 4838 | – | – | -40 °C up to +125 °C | – | – | – | – | – | – | SMT | 1.1 | 0.022 | 213 | – | – | – | 4.8 | 4.8 | 3.8 | – | ||
 | 744773047 | SPEC | 8 files | WE-PD2 SMT Power Inductor | – | – | – | – | – | – | 2460 | 4532 | – | – | -40 °C up to +125 °C | – | – | – | – | – | 50 | – | 1.82 | 0.0047 | 110 | – | – | – | 4 | 4.5 | 3.2 | SMT | ||
 | 744741101 | SPEC | 8 files | WE-TI Radial Leaded Wire Wound Inductor | – | – | – | – | – | – | 900 | 8055 | – | – | -40 °C up to +125 °C | – | – | – | – | – | 9.4 | Heat Shrinking Tube | 1.1 | 0.1 | 1000 | – | – | – | 8.5 | 8.5 | 5.5 | THT | ||
 | 885012207103 | SPEC | 8 files | WCAP-CSGP MLCCs 50 V(DC) | – | – | – | – | – | – | – | 0805 | 1 µF | ±10% | -55 °C up to +125 °C | 10 | 0.1 GΩ | X7R Class II | 0.5 | 7" Tape & Reel | – | – | – | – | – | 50 | – | – | 2 | 1.25 | 1.25 | – | ||
 | 750315797 | SPEC | – | 3 files | Inductor | – | – | – | – | – | – | 15000 | PQ3230 | – | – | -40 °C up to +125 °C | – | – | – | – | Tray | – | – | – | 0.35 | – | – | – | – | 35.56 | 37.34 | 34.29 | THT | |
 | 750315814 | SPEC | – | – | Inductor | – | – | – | – | 200 | – | 25000 | Toroid | – | – | -40 °C up to +125 °C | – | – | – | – | Tray | – | – | – | 0.052 | – | – | 500 | – | 31.05 | 16.84 | 32.75 | THT |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 7508110338 | SPEC | |
| 744824433 | SPEC | |
| 7447016 | SPEC | – |
| 74408943220 | SPEC | |
| 744773047 | SPEC | |
| 744741101 | SPEC | |
| 885012207103 | SPEC | |
| 750315797 | SPEC | – |
| 750315814 | SPEC | – |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Product series | VIN | VOut1 (V) | IOut1 (A) | Vaux (V) | fswitch (kHz) | NPRI : NSEC : NAUX | ISAT (mA) | Size | C | Tol. C | Operating Temperature | DF (%) | RISO | Ceramic Type | Fl (mm) | Packaging | fres (MHz) | Version | IR (A) | L (mH) | RDC max. (mΩ) | VR (V (AC)) | VT (V (AC)) | Material | L (mm) | W (mm) | H (mm) | Mount | Samples |
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