Phase-shifted full-bridge controller with enhanced control logic,, -40°C to 85°C


Product details


Topology Phase-Shifted Full-Bridge Control method Current, Feedforward, Voltage VCC (Min) (V) 10 VCC (Max) (V) 16.5 Duty cycle (Max) (%) 100 UVLO thresholds on/off (V) 11/9 Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 85 Gate drive (Typ) (A) 0.1 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, Multi-topology, Soft Start, Soft Switching, Synchronization Pin Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

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 open-in-new Find other PWM controllers & resonant controllers


  • 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

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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

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 16
Type Title Date
* Datasheet UCCx895 BiCMOS Advanced Phase-Shift PWM Controller datasheet (Rev. Q) Oct. 09, 2019
Application notes Phase Shifted Full Bridge, Zero Voltage Transition Design Considerations (Rev. A) Jan. 22, 2011
More literature Журнал по применению аналоговых компонентов 3кв. 2010 Jan. 13, 2011
Application notes 3Q 2010 Issue Analog Applications Journal Aug. 11, 2010
Application notes Computing power going “Platinum” Aug. 11, 2010
Application notes UCC2895 Layout and Grounding Recommendations Apr. 09, 2009
User guides UCC3895EVM-001 Configuring The UCC3895 For Direct Control Driven Synchronous Re (Rev. B) Dec. 02, 2008
Application notes Current Doubler Rectifier Offers Ripple Current Cancellation Sep. 21, 2004
Application notes Synchronous Rectifiers of a Current Doubler Feb. 27, 2003
Application notes UCC3895 CD Output Asymmetric Duty Cycle Operation Aug. 21, 2002
Application notes A Power Management Solution for Efficient, Multiple Output Applications Oct. 04, 2001
Application notes A Comparison Between the BiCMOS UCC3895 Phase Shift Controller and the UC3875 Feb. 22, 2001
More literature Seminar 800 Topic 5 - Fixed-Frequency Resonant-Switched PWM Feb. 15, 2001
More literature Seminar 900 Topic 3 - Designing a Phase-Shifted ZVT Power Converter Feb. 15, 2001
More literature Seminar 900 Topic 4 - 500-W 40-W/in3 Phase-Shifted ZVT Power Converter Feb. 15, 2001
Application notes DN-63 The Current-Doubler Rectifier: An Alternative Rectification Technique Jan. 12, 2001

Design & development

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Hardware development

UCC3895 Evaluation Module
document-generic User guide

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.


Uses the A and B outputs of the UCC3895 along with a UCC37324 dual 4A MOSFET driver to implement direct control of a synchronous rectifier current doubler in a phase shifted full bridge topology. This technique provides the proper gating and timing signals necessary to accurately synchronize output (...)

Design tools & simulation

SLUM055A.ZIP (90 KB) - PSpice Model
SLUM080.ZIP (105 KB) - PSpice Model
SLUM186.TSC (934 KB) - TINA-TI Reference Design
SLUM187.ZIP (39 KB) - TINA-TI Spice Model
SLUM188.TSC (99 KB) - TINA-TI Reference Design
SLUM189.ZIP (11 KB) - TINA-TI Spice Model

CAD/CAE symbols

Package Pins Download
PDIP (N) 20 View options
SOIC (DW) 20 View options
TSSOP (PW) 20 View options

Ordering & quality

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