Product details

Topology Phase-Shifted Full-Bridge Duty cycle (Max) (%) 97 Supply voltage (Max) (V) 17 UVLO thresholds on/off (V) 7.3/6.7 Features Adjustable Switching Frequency, Current Limiting, Enable/Shutdown, Error Amplifier, Green Mode, Light Load Efficiency, Programmable Slope Compensation, Soft Start, Soft Switching, Synchronization Pin, Thermal Shutdown Operating temperature range (C) -40 to 125 Rating Catalog Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 0.2
Topology Phase-Shifted Full-Bridge Duty cycle (Max) (%) 97 Supply voltage (Max) (V) 17 UVLO thresholds on/off (V) 7.3/6.7 Features Adjustable Switching Frequency, Current Limiting, Enable/Shutdown, Error Amplifier, Green Mode, Light Load Efficiency, Programmable Slope Compensation, Soft Start, Soft Switching, Synchronization Pin, Thermal Shutdown Operating temperature range (C) -40 to 125 Rating Catalog Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 0.2
TSSOP (PW) 24 34 mm² 7.7 x 4.4
  • Enhanced zero-voltage switching (ZVS) range
  • Direct synchronous rectifier (SR) control
  • Light-load efficiency management including:
    • Burst mode operation
    • Discontinuous conduction mode (DCM), dynamic SR on/off control with programmable threshold
    • Programmable adaptive delay
  • Average- or peak-current mode control with programmable slope compensation and voltage-mode control
  • Closed-loop soft-start and enable function
  • Programmable switching frequency up to 1 MHz with bidirectional synchronization
  • (±3%) cycle-by-cycle current limit protection with hiccup mode support
  • 150-µA start-up current
  • VDD undervoltage lockout
  • Wide temperature range: –40°C to +125°C
  • Enhanced zero-voltage switching (ZVS) range
  • Direct synchronous rectifier (SR) control
  • Light-load efficiency management including:
    • Burst mode operation
    • Discontinuous conduction mode (DCM), dynamic SR on/off control with programmable threshold
    • Programmable adaptive delay
  • Average- or peak-current mode control with programmable slope compensation and voltage-mode control
  • Closed-loop soft-start and enable function
  • Programmable switching frequency up to 1 MHz with bidirectional synchronization
  • (±3%) cycle-by-cycle current limit protection with hiccup mode support
  • 150-µA start-up current
  • VDD undervoltage lockout
  • Wide temperature range: –40°C to +125°C

The UCC28951 controller is an enhanced version of the UCC28950. It is a fully compatible drop-in replacement for the UCC28950. The UCC28951 uses advanced control of the full-bridge in addition to active control of the synchronous rectifier (SR) output stage.

Programmable delays ensure ZVS operation over a wide range of operating conditions, while the load current naturally tunes the switching delays of the secondary-side synchronous rectifiers(SR). This functionality maximizes overall system efficiency.

The 24-pin, TSSOP package complies with RoHS requirements.

The UCC28951 controller is an enhanced version of the UCC28950. It is a fully compatible drop-in replacement for the UCC28950. The UCC28951 uses advanced control of the full-bridge in addition to active control of the synchronous rectifier (SR) output stage.

Programmable delays ensure ZVS operation over a wide range of operating conditions, while the load current naturally tunes the switching delays of the secondary-side synchronous rectifiers(SR). This functionality maximizes overall system efficiency.

The 24-pin, TSSOP package complies with RoHS requirements.

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Technical documentation

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Type Title Date
* Data sheet UCC28951 Phase-Shifted Full-Bridge Controller for Wide-Input Voltage Range Applications datasheet (Rev. A) PDF | HTML 07 Dec 2021
Application note UCC28950 600W Phase Shifted Full Bridge Design Review/Application Report (Rev. D) PDF | HTML 04 Mar 2022
Application note Making the Correct Choice: UCC28950-Q1 or UCC28951-Q1 13 Nov 2017
EVM User's guide Using the UCC27714EVM-551 for Evaluating the UCC28951-Q1 06 Oct 2016
More literature Design review of a 2-kW parallelable power supply module 17 Aug 2016
More literature Design review of a 2-kW parallelable power supply module (PPT) 17 Aug 2016

Design & development

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

Evaluation board

UCC27714EVM-551 — UCC27714 600W Phase Shifted Full Bridge Converter Evaluation Module

This 600W EVM was designed to demonstrate how the UCC28950 control IC, UCC27524A and UCC27714 gate drivers could be used in a phase shifted full bridge converter that achieves ZVS from 50 to 100% load. 

Not available on TI.com
Simulation model

UCC28950 and UCC28951 PSpice Transient Model (Rev. B) UCC28950 and UCC28951 PSpice Transient Model (Rev. B)

Simulation model

UCC28950 and UCC28951 TINA-TI Startup Reference Design (Rev. A) UCC28950 and UCC28951 TINA-TI Startup Reference Design (Rev. A)

Simulation model

UCC28950 and UCC28951 TINA-TI Steady State Reference Design (Rev. A) UCC28950 and UCC28951 TINA-TI Steady State Reference Design (Rev. A)

Simulation model

UCC28950 and UCC28951 TINA-TI Transient Spice Model (Rev. A) UCC28950 and UCC28951 TINA-TI Transient Spice Model (Rev. A)

Reference designs

PMP8740 — 2-kW industrial AC/DC battery charger reference design with 92% full-load efficiency

This reference design is a module that can be set as standard power supply or a battery charger. The output voltage ranges from 0 V to 32 V at a maximum current of 62.5 A. It consists of four boards, a boost PFC, a phase shift full bridge, a small daughter board (hosting the microcontroller), and (...)
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TSSOP (PW) 24 View options

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Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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