Automotive green phase-shifted full-bridge controller with SR control for wide input voltage range


Product details


Topology Phase-Shifted Full-Bridge Control method Current, Peak Current Mode, Voltage VCC (Min) (V) 8 VCC (Max) (V) 17 Duty cycle (Max) (%) 97 UVLO thresholds on/off (V) 7.3/6.7 Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 125 Gate drive (Typ) (A) 0.2 Features Adjustable Switching Frequency, Current Limiting, Enable/Shutdown, Error Amplifier, Green Mode, Light Load Efficiency, Programmable Slope Compensation, SR Logic, Soft Start, Soft Switching, Synchronization Pin, Thermal Shutdown Rating Automotive open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

TSSOP (PW) 24 34 mm² 7.7 x 4.4 open-in-new Find other PWM controllers & resonant controllers


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40ºC to +125ºC Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESD Classification Level C3B
  • 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

All trademarks are the property of their respective owners.

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


The UCC28951-Q1 device is a new enhanced version of the UCC28950-Q1; it is a fully compatible drop-in replacement for the UCC28950-Q1. Reference application note Making the Correct Choice: UCC28950-Q1 or UCC28951-Q1 (SLUA853) for choosing the controller to best fit your application. The UCC28951-Q1 implements advanced control of the full-bridge along with 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 SRs, maximizing overall system efficiency.

The UCC28951-Q1 offers multiple light-load management features including burst mode and dynamic SR on/off control when transitioning in and out of Discontinuous Current Mode (DCM) operation.

In addition, the UCC28951-Q1 includes support for current or voltage mode control. Programmable switching frequency up to 1 MHz and a wide set of protection features including cycle-by-cycle current limit, UVLO, and thermal shutdown.

The UCC28951-Q1 is available in 24-pin TSSOP package and is RoHS compliant.

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

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 10
Type Title Date
* Datasheet UCC28951-Q1 Phase-Shifted Full-Bridge Controller for Wide Input-Voltage Range Applications datasheet (Rev. A) Feb. 27, 2018
Application notes PFC Design Choice for On Board Charger Designs May 24, 2018
Application notes Reducing Switching Losses in On-Board Chargers for Electric Vehicles Mar. 27, 2018
Technical articles Hybrid electric vehicles and electric vehicles need different isolated DC/DCs to win Dec. 27, 2017
Application notes Making the Correct Choice: UCC28950-Q1 or UCC28951-Q1 Nov. 13, 2017
Technical articles Are you on-board? Demystifying EV charging systems Jul. 31, 2017
Application notes Gate Driver Design Considerations Oct. 10, 2016
User guides Using the UCC27714EVM-551 for Evaluating the UCC28951-Q1 Oct. 06, 2016
More literature Design review of a 2-kW parallelable power supply module Aug. 17, 2016
More literature Design review of a 2-kW parallelable power supply module (PPT) Aug. 17, 2016

Design & development

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

Design tools & simulation

SLUM169B.ZIP (153 KB) - PSpice Model
SLUM276A.TSC (738 KB) - TINA-TI Reference Design
SLUM277A.TSC (739 KB) - TINA-TI Reference Design
SLUM278A.ZIP (98 KB) - TINA-TI Spice Model

Reference designs

Compact, Efficient Unidirectional 48V to 12V@400W Automotive Power Supply Reference Design
PMP20657 — The PMP20657 reference design is a compact, efficient unidirectional 48V to 12V @ 400W power converter. The design is pseudo-isolated to protect 12V loads. The phase-shifted full-bridge topology achieves over 95% peak efficiency. Light-load mode enables <100mW standby power with full (...)
document-generic Schematic document-generic User guide
Automotive 400-W, 48-V Battery Input, 12-V Output Power Reference Design
TIDA-01407 — This reference design is an automotive, 400-W, phase-shifted full-bridge converter which generates the 12-V output from a 48-V car battery. The enhanced phaseshifted full-bridge controller implements programmable delays which ensure zero voltage switching (ZVS) over a wide range of operating (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 24 View options

Ordering & quality

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

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. ​​​​​​​​​​​​​​


Related videos