Product details


Topology Full-Bridge Control mode Current, Feedforward, Voltage Duty cycle (Max) (%) 100 Supply voltage (Max) (V) 17 UVLO thresholds on/off (V) 43413 Features Error Amplifier, Green Mode, Light Load Efficiency, Soft Start, Soft Switching, Synchronization Pin Operating temperature range (C) -55 to 125 Rating Military Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 0.1 open-in-new Find other PWM controllers

Package | Pins | Size

CDIP (J) 20 167 mm² 26.92 x 7.62 LCCC (FK) 20 79 mm² 8.89 x 8.89 open-in-new Find other PWM 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
open-in-new Find other PWM controllers


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.

open-in-new Find other PWM controllers

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 9
Type Title Date
* Data sheet UCCx895 BiCMOS Advanced Phase-Shift PWM Controller datasheet (Rev. Q) Oct. 09, 2019
Application note UCC2895 Layout and Grounding Recommendations Apr. 09, 2009
User guide UCC3895EVM-001 Configuring The UCC3895 For Direct Control Driven Synchronous Re (Rev. B) Dec. 02, 2008
Application note Current Doubler Rectifier Offers Ripple Current Cancellation Sep. 21, 2004
Application note Synchronous Rectifiers of a Current Doubler Feb. 27, 2003
Application note UCC3895 CD Output Asymmetric Duty Cycle Operation Aug. 21, 2002
Application note A Power Management Solution for Efficient, Multiple Output Applications Oct. 04, 2001
Application note A Comparison Between the BiCMOS UCC3895 Phase Shift Controller and the UC3875 Feb. 22, 2001
Application note DN-63 The Current-Doubler Rectifier: An Alternative Rectification Technique Jan. 12, 2001

Design & development

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

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
CDIP (J) 20 View options
LCCC (FK) 20 View options

Ordering & quality

Information included:
  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​