Der bei Endrich Bauelemente Vertriebs GmbH erhältliche MPX2002 von MPS ist ein All-in-One-Flyback-Controller mit integrierter primärer Treiberschaltung, sekundärer Steuerung, synchronem Gleichrichtungstreiber und Sicherheitsrückführung. Der Baustein bietet die Vorteile der primärseitigen Regelung (PSR) und der sekundärseitigen Regelung (SSR). Das gesamte System wird dadurch vereinfacht und die Kosten für die Stückliste werden reduziert, da keine Rückkopplungsschaltung erforderlich ist. Der Synchrongleichrichter (SR) passt das Ansteuersignal des primärseitigen MOSFETs an, wodurch er sicher im Dauerleitungsmodus (CCM) betrieben werden kann. Der integrierte Synchrongleichrichter-Controller regelt den MOSFET auf einen niedrigen Schwellenwert. Dadurch wird der Gesamtwirkungsgrad erhöht und gleichzeitig ein flexibleres Design ermöglicht. Ein integrierter Linearregler sorgt für die Stromversorgung des Synchrongleichrichters, so dass der MPX2002 den Low-Side-SR-MOSFET ohne Hilfswicklung ansteuern kann, selbst wenn die Leistung nicht ausreicht. Der MPX2002 kann bei hoher Last im CCM-Betrieb laufen und dann auf Quasi-Resonant (QR) umschalten, wenn die Last sinkt. Sinkt die Last weiter, arbeitet der MPX2002 im Puls-Frequenz-Modulations-Modus (PFM). Die Schaltfrequenz ist auf 20 kHz festgelegt, wenn er in den Burst-Modus wechselt, was das hörbare Rauschen reduziert. Mit dieser Funktion kann der MPX2002 unter allen Lastbedingungen einen hohen Wirkungsgrad bei hervorragender elektromagnetischer Interferenz (EMI) erzielen. Der Controller verfügt über mehrere Schutzfunktionen, darunter VCC-Überspannungsschutz (OVP), primärer Überstromschutz (POCP), sekundärseitiger Ausgangsüberlastschutz (OLP), interner Brown-in (B/I) und Brown-out (B/O), Kurzschlussschutz (SCP+SSP), SR-Gate-Open/Short-Schutz (SGOP/SGSP), SRD-Abnormalitätsschutz (SRDP), FB-OVP und Unterspannungsschutz (UVP), interne thermische Abschaltung, Unterspannungs-Lockout (UVLO) und ein extern ausgelöster Schutz (Ext. P). Der MPX2002 ist in den Gehäusen SOICW-16 und SOICW-16-T erhältlich.
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All-in-One Flyback-Controller von MPS
A story by Endrich Bauelemente Vertriebs GmbH
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All-in-One Flyback-Controller von MPS
A story by Endrich Bauelemente Vertriebs GmbH
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