Product details

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PDIP (N) 20 229 mm² 24.33 x 9.4 SOIC (DW) 20 132 mm² 12.8 x 10.3
  • Programmable Output Turn On Delay; Zero Delay Available
  • Compatible with Voltage Mode or Current Mode Topologies
  • Practical Operation at Switching Frequencies to 300 kHz
  • 10-MHz Error Amplifier
  • Pin Programmable Undervoltage Lockout
  • Low Startup Current — 150 µA
  • Soft Start Control
  • Outputs Active Low During UVLO

  • Programmable Output Turn On Delay; Zero Delay Available
  • Compatible with Voltage Mode or Current Mode Topologies
  • Practical Operation at Switching Frequencies to 300 kHz
  • 10-MHz Error Amplifier
  • Pin Programmable Undervoltage Lockout
  • Low Startup Current — 150 µA
  • Soft Start Control
  • Outputs Active Low During UVLO

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.

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.

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Technical documentation

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Type Title Date
* Data sheet Phase Shift Resonant Controller datasheet (Rev. B) 13 Dec 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

Design & development

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Evaluation board

UCC3895EVM-001 — UCC3895 Evaluation Module

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.

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PDIP (N) 20 View options
SOIC (DW) 20 View options

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