Topologie | Sperrwandler |
Eingangsspannung | 85-265 V |
Schaltfrequenz | 0.14-106 kHz |
Ausgang 1 | 5 V / 2.1 A |
IC-Revision | B |
The UCC28740 isolated-flyback power-supply controller provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. Constant-Current (CC) regulation is accomplished through Primary-side Regulation (PSR) techniques. This device processes information from opto-coupled feedback and an auxiliary flyback winding for precise high-performance control of output voltage and current.
An internal 700-V startup switch, dynamically-controlled operating states, and a tailored modulation profile support ultra-low standby power without sacrificing startup time or output transient response.
Control algorithms in the UCC28740 allow operating efficiencies to meet or exceed applicable standards. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.
The controller has a maximum switching frequency of 100 kHz and always maintains control of the peak-primary current in the transformer. Protection features keep primary and secondary component stresses in check. A minimum switching frequency of 170 Hz facilitates the achievement of less than 10-mW no-load power.
Remarks:
Artikel Nr. | Datenblatt | Simulation | Downloads | Status | Produktserie | L (µH) | IR (A) | ISAT (A) | RDC max. (Ω) | fres (MHz) | Version | Muster | |
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![]() | 7447462221 | SPEC | 8 Dateien | Aktiv i| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | WE-TI Tonneninduktivität | 220 | 0.5 | 0.5 | 1.2 | 4.8 | Schrumpfschlauch | ||
![]() | 7508111111 | SPEC | 5 Dateien | Aktiv i| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre. | Transformer | 560 | – | – | – | – | – |
Artikel Nr. | Datenblatt | Simulation | |
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![]() | 7447462221 | SPEC | |
![]() | 7508111111 | SPEC |
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Artikel Nr. | Datenblatt | Simulation | Downloads | Status | Produktserie | L (µH) | IR (A) | ISAT (A) | RDC max. (Ω) | fres (MHz) | Version | Muster |
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