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UCC28250

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Advanced half-bridge/full-bridge PWM controller with pre-bias operation

Product details

Topology Forward, Full bridge, Half bridge, Push pull Control mode Current, Voltage Duty cycle (max) (%) 100 Switching frequency (max) (kHz) 1000 Features Current limiting, High-voltage startup, SR logic UVLO thresholds on/off (V) 4.3/4.1 Operating temperature range (°C) -40 to 125 Rating Catalog Gate drive (typ) (A) 0.2 Vin (max) (V) 17
Topology Forward, Full bridge, Half bridge, Push pull Control mode Current, Voltage Duty cycle (max) (%) 100 Switching frequency (max) (kHz) 1000 Features Current limiting, High-voltage startup, SR logic UVLO thresholds on/off (V) 4.3/4.1 Operating temperature range (°C) -40 to 125 Rating Catalog Gate drive (typ) (A) 0.2 Vin (max) (V) 17
TSSOP (PW) 20 41.6 mm² 6.5 x 6.4 VQFN (RGP) 20 16 mm² 4 x 4
  • Prebiased Start-up
  • Synchronous Rectifier Control Outputs With Programmable Delays (Including Zero Delay Support)
  • Voltage Mode Control With Input Voltage Feed-Forward or Current Mode Control
  • Primary or Secondary-Side Control
  • 3.3-V, 1.5% Accurate Reference Output
  • 1-MHz Capable Switching Frequency
  • 1% Accurate Cycle-by-Cycle Overcurrent Protection with Matched Duty Cycle Outputs
  • Programmable Soft-Start and Hiccup Restart Timer
  • Thermally Enhanced 4-mm × 4-mm QFN-20 Package and 20-pin TSSOP Package
  • Prebiased Start-up
  • Synchronous Rectifier Control Outputs With Programmable Delays (Including Zero Delay Support)
  • Voltage Mode Control With Input Voltage Feed-Forward or Current Mode Control
  • Primary or Secondary-Side Control
  • 3.3-V, 1.5% Accurate Reference Output
  • 1-MHz Capable Switching Frequency
  • 1% Accurate Cycle-by-Cycle Overcurrent Protection with Matched Duty Cycle Outputs
  • Programmable Soft-Start and Hiccup Restart Timer
  • Thermally Enhanced 4-mm × 4-mm QFN-20 Package and 20-pin TSSOP Package

The UCC28250 PWM controller is designed for high power density applications that may have stringent prebiased start-up requirements. The integrated synchronous rectifier control outputs target high-efficiency and high-performance topologies such as half-bridge, full-bridge, interleaved forward, and push-pull. The UCC27200 half-bridge drivers and UCC2732X MOSFET drivers used in conjunction with the UCC28250 provide a complete power converter solution.

Externally programmable soft-start, used in conjunction with an internal prebiased start-up circuit, allows the controller to gradually reach a steady-state operating point under all output conditions. The UCC28250 can be configured for primary or secondary-side control and either voltage or current mode control can be implemented.

The oscillator operates at frequencies up to 2 MHz, and can be synchronized to an external clock. Input voltage feedforward, cycle-by-cycle current limit, and a programmable hiccup timer allow the system to stay within a safe operation range. Input voltage, output voltage and temperature protection can be implemented. Dead time between primary-side switch and secondary-side synchronous rectifiers can be independently programmed.

The UCC28250 PWM controller is designed for high power density applications that may have stringent prebiased start-up requirements. The integrated synchronous rectifier control outputs target high-efficiency and high-performance topologies such as half-bridge, full-bridge, interleaved forward, and push-pull. The UCC27200 half-bridge drivers and UCC2732X MOSFET drivers used in conjunction with the UCC28250 provide a complete power converter solution.

Externally programmable soft-start, used in conjunction with an internal prebiased start-up circuit, allows the controller to gradually reach a steady-state operating point under all output conditions. The UCC28250 can be configured for primary or secondary-side control and either voltage or current mode control can be implemented.

The oscillator operates at frequencies up to 2 MHz, and can be synchronized to an external clock. Input voltage feedforward, cycle-by-cycle current limit, and a programmable hiccup timer allow the system to stay within a safe operation range. Input voltage, output voltage and temperature protection can be implemented. Dead time between primary-side switch and secondary-side synchronous rectifiers can be independently programmed.

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Technical documentation

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Type Title Date
* Data sheet UCC28250 Advanced PWM Controller With Prebias Operation datasheet (Rev. D) PDF | HTML 28 Jun 2015
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Differences Between the UCC28251 and UCC28250 and Evaluation of the UCC28251 in (Rev. A) 15 Feb 2013
EVM User's guide Using the UCC28250EVM-564 (Rev. A) 07 Oct 2011
EVM User's guide Using the UCC28250EVM-501 Half Bridge DC-DC Converter with Primary Side Control (Rev. B) 07 Dec 2010
Application note Designing UCC28250 as a Secondary Side Control with a Pre-Bias Condition 24 Nov 2010

Design & development

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

Evaluation board

UCC28250EVM-501 — Evaluation Module for UCC28250 Advanced PWM Controller on Primary Side Control

The UCC28250EVM-501 is a fully assembled and tested circuit for evaluating the UCC28250 Advanced PWM Controller with Pre-Bias Operation. The UCC28250EVM-501 comprises a symmetrical half-bridge DC/DC converter, which converts a 36V to 72V DC input to a 3.3V DC output with a maximum 75W output power.
User guide: PDF
Not available on TI.com
Evaluation board

UCC28250EVM-564 — Evaluation Module for UCC28250 Adv.PWM Controller w/ Pre-biased Load Op. on Secondary Side Control

The UCC28250EVM-564 is a fully assembled and tested circuit for evaluating the UCC28250 Advanced PWM Controller with Pre-Bias Operation. The UCC28250EVM-564 comprises a symmetrical half bridge DC-DC converter which converts a 36V to 75V DC input to a 3.3V DC output with 100W maximum output power.
User guide: PDF
Not available on TI.com
Simulation model

UCC28250 Unencrypted PSPICE Average Model Package (Rev. A)

SLUM171A.ZIP (96 KB) - PSpice Model
Calculation tool

SLUC260 UCC28250 Excel Design Tool

Supported products & hardware

Supported products & hardware

Products
PWM controllers
UCC28250 Advanced half-bridge/full-bridge PWM controller with pre-bias operation
Reference designs

PMP8878 — 1/8 Brick Isolated DC/DC Telecom Power Module Reference Design

PMP8878 is a full-function 1/8th brick isolated DC/DC telecom power module based on UCC28250 advanced PWM controller. The reference design features secondary side control and hard switching full bridge power topology to deliver 12V/180W of output power operating across a wide range 40V-75V input (...)
Test report: PDF
Schematic: PDF
Package Pins Download
TSSOP (PW) 20 View options
VQFN (RGP) 20 View options

Ordering & quality

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