Product details

Topology Phase-Shifted Full-Bridge Duty cycle (Max) (%) 100 Supply voltage (Max) (V) 16.5 UVLO thresholds on/off (V) 11/9 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, Multi-topology, Soft Start, Soft Switching, Synchronization Pin Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 0.1
Topology Phase-Shifted Full-Bridge Duty cycle (Max) (%) 100 Supply voltage (Max) (V) 16.5 UVLO thresholds on/off (V) 11/9 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, Multi-topology, Soft Start, Soft Switching, Synchronization Pin Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 0.1
PDIP (N) 20 229 mm² 24.33 x 9.4 SOIC (DW) 20 132 mm² 12.8 x 10.3 TSSOP (PW) 20 42 mm² 6.5 x 6.4
  • Programmable-output turnon delay
  • Adaptive delay set
  • Bidirectional oscillator synchronization
  • Voltage-mode, peak current-mode, or average current-mode control
  • Programmable soft start, soft stop, and chip disable via a single pin
  • 0% to 100% duty-cycle control
  • 7-MHz error amplifier
  • Operation to 1 MHz
  • Typical 5-mA operating current at 500 kHz
  • Very low 150-µA current during UVLO
  • Programmable-output turnon delay
  • Adaptive delay set
  • Bidirectional oscillator synchronization
  • Voltage-mode, peak current-mode, or average current-mode control
  • Programmable soft start, soft stop, and chip disable via a single pin
  • 0% to 100% duty-cycle control
  • 7-MHz error amplifier
  • Operation to 1 MHz
  • Typical 5-mA operating current at 500 kHz
  • Very low 150-µA current during UVLO

The UCC3895 is a phase-shift PWM controller that implements control of a full-bridge power stage by phase shifting the switching of one half-bridge with respect to the other. The device allows constant frequency pulse-width modulation in conjunction with resonant zero-voltage switching to provide high efficiency at high frequencies. The part is used either as a voltage-mode or current-mode controller.

While the UCC3895 maintains the functionality of the UC3875/6/7/8 family and UC3879, it improves on that controller family with additional features such as enhanced control logic, adaptive delay set, and shutdown capability. Because the device is built using the BCDMOS process, it operates with dramatically less supply current than it’s bipolar counterparts. The UCC3895 operates with a maximum clock frequency of 1 MHz.

The UCC3895 is a phase-shift PWM controller that implements control of a full-bridge power stage by phase shifting the switching of one half-bridge with respect to the other. The device allows constant frequency pulse-width modulation in conjunction with resonant zero-voltage switching to provide high efficiency at high frequencies. The part is used either as a voltage-mode or current-mode controller.

While the UCC3895 maintains the functionality of the UC3875/6/7/8 family and UC3879, it improves on that controller family with additional features such as enhanced control logic, adaptive delay set, and shutdown capability. Because the device is built using the BCDMOS process, it operates with dramatically less supply current than it’s bipolar counterparts. The UCC3895 operates with a maximum clock frequency of 1 MHz.

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Technical documentation

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Type Title Date
* Data sheet UCCx895 BiCMOS Advanced Phase-Shift PWM Controller datasheet (Rev. Q) 09 Oct 2019
Technical article 35 years later, APEC continues to set the tone for innovation in power management 27 Feb 2020
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 UCC2895 Layout and Grounding Recommendations 09 Apr 2009
User guide UCC3895EVM-001 Configuring The UCC3895 For Direct Control Driven Synchronous Re (Rev. B) 02 Dec 2008
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 UCC3895 CD Output Asymmetric Duty Cycle Operation 21 Aug 2002
Application note A Power Management Solution for Efficient, Multiple Output Applications 04 Oct 2001
Application note A Comparison Between the BiCMOS UCC3895 Phase Shift Controller and the UC3875 22 Feb 2001
More literature Seminar 800 Topic 5 - Fixed-Frequency Resonant-Switched PWM 15 Feb 2001
More literature Seminar 900 Topic 3 - Designing a Phase-Shifted ZVT Power Converter 15 Feb 2001
More literature Seminar 900 Topic 4 - 500-W 40-W/in3 Phase-Shifted ZVT Power Converter 15 Feb 2001
Application note DN-63 The Current-Doubler Rectifier: An Alternative Rectification Technique 12 Jan 2001

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

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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Simulation model

UCCx895 and UCCx7324 Families PSpice Transient Model (Rev. A)

SLUM055A.ZIP (90 KB) - PSpice Model
Simulation model

UCCx895 Family PSpice Average Model

SLUM080.ZIP (105 KB) - PSpice Model
Simulation model

UCC1895, UCC2895, UCC3895 TINA-TI Transient Reference Design

SLUM186.TSC (934 KB) - TINA-TI Reference Design
Simulation model

UCC1895, UCC2895, UCC3895 TINA-TI Transient Spice Model

SLUM187.ZIP (39 KB) - TINA-TI Spice Model
Simulation model

UCC1895, UCC2895, UCC3895 TINA-TI Average Reference Design

SLUM188.TSC (99 KB) - TINA-TI Reference Design
Simulation model

UCC1895, UCC2895, UCC3895 TINA-TI Average Spice Model

SLUM189.ZIP (11 KB) - TINA-TI Spice Model
Reference designs

PMP9622 — 350W Constant Voltage - Constant Current (CVCC) Phase-Shifted Full Bridge reference design

This reference design uses the UCC3895 Phase-Shifted Full Bridge controller to implement a high efficiency, 120VAC input to 44Vdc up to 8A output.  The power supply is set up to be  constant voltage-constant current.  The voltage and current are set by fixed resistor values and could (...)
Reference designs

PMP6720 — 300 Watt Phase Shifted Full Bridge

This design uses the UCC3895 Phase Shifted Full Bridge controller in a 48 volt to 14 volt at 20 amp isolated DC to DC converter. The converter achieves 94% efficiency with simple diode rectification.
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PDIP (N) 20 View options
SOIC (DW) 20 View options
TSSOP (PW) 20 View options

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