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Details
| Topologie | Sperrwandler |
| Eingangsspannung | 8-30 V |
| Schaltfrequenz | 135-560 kHz |
| Ausgang 1 | 50 V |
| IC-Revision | E |
Beschreibung
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.
Eigenschaften
- 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
Typische Anwendungen
- Building Automation and White Goods SMPS
- Audio Amplifiers
- Industrial Power Conversion
- SMPS for Smart Meters
- Isolated Telecom Power SuppliesIsolated Telecom Power Supplies
Weiterführende Informationen
Artikeldaten
Artikel Nr. | Datenblatt | Simulation | Downloads | Status | Produktserie | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | IR(A) | L(µH) | RDC max.(Ω) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | B(mm) | H(mm) | Montageart | Muster | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCI SMT-Hochstrominduktivität, 8.7 A, 8 A | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWE-HCI SMT-Hochstrominduktivität | Performance Nennstrom8.7 A | Sättigungsstrom 18 A | Sättigungsstrom @ 30%9 A | Gleichstromwiderstand21.7 mΩ | Eigenresonanzfrequenz9.5 MHz | – | Induktivität33 µH | Gleichstromwiderstand23.44 Ω | – | – | MaterialMnZn | Länge18.3 mm | Breite18.2 mm | Höhe8.9 mm | MontageartSMT | ||||
 | WE-CMB Stromkompensierte Netzdrossel, –, – | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | ProduktserieWE-CMB Stromkompensierte Netzdrossel | – | – | – | – | – | Nennstrom3 A | Induktivität20000 µH | Gleichstromwiderstand0.16 Ω | Nennspannung250 V (AC) | Prüfspannung1500 V (AC) | MaterialMnZn | Länge30 mm | Breite21 mm | Höhe35 mm | MontageartTHT | ||||
750313248 | Flyback Transformer WE-FB, –, – | Simulation– | Downloads– | Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | Produktserie Flyback Transformer WE-FB | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |