UCC28251

ACTIVE

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

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Product details

Parameters

Topology Forward, Full-Bridge, Half-Bridge, Push-Pull Control method Current, Feedforward, Voltage VCC (Min) (V) 4.7 VCC (Max) (V) 17 Duty cycle (Max) (%) 100 UVLO thresholds on/off (V) 4.3/4.1 Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 125 Gate drive (Typ) (A) 0.2 Features Current Limiting, Leading Edge Blanking, Multi-topology, Pre-Bias Start-Up, Programmable Slope Compensation, SR Logic, Soft Start, Synchronization Pin Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

TSSOP (PW) 20 42 mm² 6.5 x 6.4 VQFN (RGP) 20 16 mm² 4 x 4 open-in-new Find other PWM controllers & resonant controllers

Features

  • Prebiased Startup
  • 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
  • Lower Minimum Operating Frequency
  • 1% Accurate Cycle-by-Cycle Over Current
    Protection with Matched Duty Cycle Outputs
  • Programmable Soft-Start and Hiccup Restart
    Timer
  • Thermally Enhanced 4-mm × 4-mm VQFN-20
    Package and 20-pin TSSOP Package
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Description

The UCC28251 PWM controller is designed for high power density applications that may have stringent prebiased startup requirements. The UCC28251’s integrated synchronous rectifier control outputs target high efficiency and high performance topologies such as half-bridge, full-bridge, interleaved forward, and push-pull. The UCC27210 half bridge drivers and UCC2752x MOSFET drivers used in conjunction with the UCC28251 provide a complete power converter solution.

The UCC28251 is a functional variant of the UCC28250 PWM Controller. While the same basic functionality of the UCC28250 is largely maintained, the UCC28251 is designed to enhance performance in both offline, 400-V input DC-to-DC applications and 48-V input full-bridge or half-bridge applications.

Externally programmable soft-start, used in conjunction with an internal pre-biased startup circuit, allows the controller to gradually reach a steady-state operating point under all output conditions. The UCC28251 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 1.8 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
* Datasheet UCC28251 Advanced PWM Controller With Prebias Operation datasheet (Rev. E) Dec. 29, 2014
Application notes Analog Applications Journal 3Q 2015 Jul. 24, 2015
Application notes Fast input-voltage transient response with digitally-controlled isolated DC/DC Jul. 24, 2015
White papers Advancing Power Supply Solutions Through the Promise of GaN Feb. 24, 2015
Application notes Differences Between the UCC28251 and UCC28250 and Evaluation of the UCC28251 in (Rev. A) Feb. 15, 2013

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$99.00
Description
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.
Features
  • Pre-biased Startup
  • 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 (...)
EVALUATION BOARDS Download
document-generic User guide
$99.00
Description
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.
Features
  • Pre-biased Startup
  • 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 (...)

Design tools & simulation

SIMULATION MODELS Download
SLUM358A.ZIP (59 KB) - PSpice Model
SIMULATION MODELS Download
SLUM389.TSC (96 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLUM390.ZIP (8 KB) - TINA-TI Spice Model

CAD/CAE symbols

Package Pins Download
QFN (RGP) 20 View options
TSSOP (PW) 20 View options

Ordering & quality

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