Inicio Gestión de la energía Controladores CA/CC y CC/CC (FET externo)

UCC28251

ACTIVO

Controlador PWM avanzado de medio puente/puente completo con funcionamiento prepolarizado para aplic

Detalles del producto

Vin (max) (V) 17 Operating temperature range (°C) -40 to 125 Control mode Current, Feedforward, Voltage Topology Forward, Full bridge, Half bridge, Push pull Rating Catalog Features Current limiting, Leading edge blanking, Multi-topology, Pre-bias startUp, Programmable slope compensation, SR logic, Soft start, Synchronization pin Duty cycle (max) (%) 100
Vin (max) (V) 17 Operating temperature range (°C) -40 to 125 Control mode Current, Feedforward, Voltage Topology Forward, Full bridge, Half bridge, Push pull Rating Catalog Features Current limiting, Leading edge blanking, Multi-topology, Pre-bias startUp, Programmable slope compensation, SR logic, Soft start, Synchronization pin Duty cycle (max) (%) 100
TSSOP (PW) 20 41.6 mm² 6.5 x 6.4 VQFN (RGP) 20 16 mm² 4 x 4
  • 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
  • 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

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.

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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Documentación técnica

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Tipo Título Fecha
* Data sheet UCC28251 Advanced PWM Controller With Prebias Operation datasheet (Rev. E) PDF | HTML 29 dic 2014
Selection guide Power Management Guide 2018 (Rev. R) 25 jun 2018
Analog Design Journal Analog Applications Journal 3Q 2015 24 jul 2015
Analog Design Journal Fast input-voltage transient response with digitally-controlled isolated DC/DC 24 jul 2015
White paper Advancing Power Supply Solutions Through the Promise of GaN 24 feb 2015
Application note Differences Between the UCC28251 and UCC28250 and Evaluation of the UCC28251 in (Rev. A) 15 feb 2013

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

UCC28250EVM-501 — Módulo de evaluación UCC28250 para controlador PWM avanzado con control de lado primario

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.
Guía del usuario: PDF
Placa de evaluación

UCC28250EVM-564 — Módulo de evaluación UCC28250 para controlador PWM avanzado con funcionamiento de carga prepolarizad

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.
Guía del usuario: PDF
Modelo de simulación

UCC28251 TINA-TI Average Reference Design

SLUM389.TSC (96 KB) - TINA-TI Reference Design
Modelo de simulación

UCC28251 TINA-TI Average Spice Model

SLUM390.ZIP (8 KB) - TINA-TI Spice Model
Modelo de simulación

UCC28251 Unencrypted PSpice Average Model Package (Rev. A)

SLUM358A.ZIP (59 KB) - PSpice Model
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
TSSOP (PW) 20 Ultra Librarian
VQFN (RGP) 20 Ultra Librarian

Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

Soporte y capacitación

Foros de TI E2E™ con asistencia técnica de los ingenieros de TI

El contenido lo proporcionan “tal como está” TI y los colaboradores de la comunidad y no constituye especificaciones de TI. Consulte los términos de uso.

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