The UC3879 controls a bridge power stage by phase shifting the switching of one half-bridge with respect to the other. This allows constant frequency pulse width modulation in combination with resonant, zero-voltage switching for high efficiency performance. The UC3879 can be configured to provide control in either voltage mode or current mode operation, with overcurrent shutdown for fast fault protection.
Independently programmable time delays provide dead-time at the turn-on of each output stage, allowing time for each resonant switching interval.
With the oscillator capable of operating in excess of 600 kHz, overall output switching frequencies to 300 kHz are practical. In addition to the standard free running mode, with the CLKSYNC pin, the user may configure the UC3879 to accept an external clock synchronization signal. Alternatively, up to three units can be locked together with the operational frequency determined by the fastest device.
Protective features include an undervoltage lockout and overcurrent protection. Additional features include a 10-MHz error amplifier, a 5-V precision reference, and soft start. The UC3879 is available in 20 pin N, J, DW, and Q and 28 pin L packages.
| Typ | Titel | Datum | ||
|---|---|---|---|---|
| * | Data sheet | Phase Shift Resonant Controller datasheet (Rev. B) | 13 Dez 2006 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Application note | Phase Shifted Full Bridge, Zero Voltage Transition Design Considerations (Rev. A) | 22 Jan 2011 | ||
| Application note | Current Doubler Rectifier Offers Ripple Current Cancellation | 21 Sep 2004 | ||
| Application note | Synchronous Rectifiers of a Current Doubler | 27 Feb 2003 | ||
| Application note | A Comparison Between the BiCMOS UCC3895 Phase Shift Controller and the UC3875 | 22 Feb 2001 | ||
| Application note | DN-63 The Current-Doubler Rectifier: An Alternative Rectification Technique | 12 Jan 2001 | ||
| Application note | U-154 The New UC3879 Phase-Shifted PWM Controller Simplifies the Design | 05 Sep 1999 |
Weitere Bedingungen oder erforderliche Ressourcen enthält gegebenenfalls die Detailseite, die Sie durch Klicken auf einen der unten stehenden Titel erreichen.
The UCC3895EVM-001 is an isolated 48V input phase shifted full bridge converter providing an output of 3.3V at 15A. Using the AB outputs of the UCC3895, a novel technique for direct control driven synchronous rectification is demonstrated.
| Gehäuse | Pins | Herunterladen |
|---|---|---|
| PDIP (N) | 20 | Optionen anzeigen |
| SOIC (DW) | 20 | Optionen anzeigen |
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