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UCC3895

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Phase-shifted full-bridge controller with enhanced control logic, 0°C to 70°C

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Phase-shifted full-bridge controller with enhanced control logic, 0°C to 70°C

UCC3895

ACTIVE
Data sheet Order now

Product details

Parameters

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) 0 to 70 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

Features

  • 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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Description

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) Oct. 09, 2019
Technical article 35 years later, APEC continues to set the tone for innovation in power management Feb. 27, 2020
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Phase Shifted Full Bridge, Zero Voltage Transition Design Considerations (Rev. A) Jan. 22, 2011
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
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 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

EVALUATION BOARD Download
UCC3895 Evaluation Module
UCC3895EVM-001
document-generic User guide
149
Description

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.

Features

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 (...)

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Design tools & simulation

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

Reference designs

REFERENCE DESIGNS Download
350W Constant Voltage - Constant Current (CVCC) Phase-Shifted Full Bridge reference design
PMP9622 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
300 Watt Phase Shifted Full Bridge
PMP6720 — 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.

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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  • Ongoing reliability monitoring

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