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

UCC28742

ACTIVO

Controlador de retorno de alta eficiencia con una precisión de regulación de salida del 1 %

Detalles del producto

Operating temperature range (°C) -40 to 125 Control mode Secondary-side regulation Topology Flyback Rating Catalog Features Current limiting, DCM, Light load efficiency, Light-load efficiency, Overcurrent protection, Overvoltage protection, Quasi-Resonant, SSR, Secondary-side regulated, Soft start, USB C/PD compatible, Valley switching Duty cycle (max) (%) 99
Operating temperature range (°C) -40 to 125 Control mode Secondary-side regulation Topology Flyback Rating Catalog Features Current limiting, DCM, Light load efficiency, Light-load efficiency, Overcurrent protection, Overvoltage protection, Quasi-Resonant, SSR, Secondary-side regulated, Soft start, USB C/PD compatible, Valley switching Duty cycle (max) (%) 99
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • Opto-Coupled Feedback Enables up to 1% Regulation
  • Accurate Current Limit with Overload Timeout Protection and Delayed Hiccup Response
  • Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
  • 80-kHz Maximum Switching Frequency
  • Frequency Dithering to Ease EMI Compliance
  • Clamped Gate-Drive Output for MOSFET
  • Ultra-Low Start-Up Current and Large VDD Hysteresis
    • High Value Start-Up Resistor
    • Low Bias Capacitance
  • Fault Protections
    • Input Low Line
    • Output Over-Voltage
    • Over-Current
    • Short-Circuit
  • SOT23-6 Package
  • Create a Custom Design Using the UCC28742 with the WEBENCH® Power Designer
  • Opto-Coupled Feedback Enables up to 1% Regulation
  • Accurate Current Limit with Overload Timeout Protection and Delayed Hiccup Response
  • Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
  • 80-kHz Maximum Switching Frequency
  • Frequency Dithering to Ease EMI Compliance
  • Clamped Gate-Drive Output for MOSFET
  • Ultra-Low Start-Up Current and Large VDD Hysteresis
    • High Value Start-Up Resistor
    • Low Bias Capacitance
  • Fault Protections
    • Input Low Line
    • Output Over-Voltage
    • Over-Current
    • Short-Circuit
  • SOT23-6 Package
  • Create a Custom Design Using the UCC28742 with the WEBENCH® Power Designer

The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-side regulated PWM controller for efficient AC-to-DC power supplies. It is an isolated-flyback power-supply controller that provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. This device processes information from opto-coupled feedback and an auxiliary flyback winding for high-performance control of output voltage and current.

The UCC28742 employs advanced control algorithms to achieve high operating efficiency and performance. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. A minimum switching frequency of 200 Hz facilitates the achievement of low no-load input power.

The UCC28742 off-line flyback controller is a highly integrated, 6-pin secondary-side regulated PWM controller for efficient AC-to-DC power supplies. It is an isolated-flyback power-supply controller that provides Constant-Voltage (CV) using an optical coupler to improve transient response to large-load steps. This device processes information from opto-coupled feedback and an auxiliary flyback winding for high-performance control of output voltage and current.

The UCC28742 employs advanced control algorithms to achieve high operating efficiency and performance. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. A minimum switching frequency of 200 Hz facilitates the achievement of low no-load input power.

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Documentación técnica

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* Data sheet UCC28742 High-Efficiency Flyback Controller with Optocoupler Feedback datasheet (Rev. A) PDF | HTML 08 may 2018
Technical article Snubbing the flyback converter PDF | HTML 26 feb 2024
Technical article Adding a single capacitor to improve cross-regulation in dual-output flyback power supplies PDF | HTML 21 dic 2023
Application brief Flyback Selection Guide PDF | HTML 23 jun 2022
Application note Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips PDF | HTML 31 ago 2021
More literature PCB layout guidelines to optimize power supply performance 23 mar 2021
Application note Minimize Standby Consumption for UCC287XX Family 01 ago 2019
Technical article Choosing the right flyback controller for your design PDF | HTML 24 ago 2018
Application note Selecting Electrolitic Bus Capacitor for Universal Input 17 jul 2018
EVM User's guide Using the UCC28742EVM-001 (Rev. B) 06 jun 2018

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

UCC28742EVM-001 — Módulo de evaluación UCC28742 de convertidor CA/CC de 10 W

El UCC28742EVM-001 es un módulo de evaluación de 10 W para evaluar un adaptador fuera de línea para aplicaciones USB. El EVM cumple con los requisitos de eficiencia y energía de reserva de nivel 2 de CoC y nivel 6 de DoE. Está destinado a fines de evaluación y no pretende ser un producto final. El (...)

Guía del usuario: PDF
Modelo de simulación

UCC28742 SIMPLIS Model (Rev. A)

SLUJ001A.ZIP (840 KB) - SIMPLIS Model
Herramienta de cálculo

SLUC652 UCC28742 Design Calculator

Productos y hardware compatibles

Productos y hardware compatibles

Productos
Controladores CA/CC y CC/CC (FET externo)
UCC28742 Controlador de retorno de alta eficiencia con una precisión de regulación de salida del 1 %

Muchos diseños de referencia de TI incluyen UCC28742

Utilice nuestra herramienta de selección de diseños de referencia para revisar e identificar los diseños que mejor se adaptan a su aplicación y parámetros.

Encapsulado Pines Símbolos CAD, huellas y modelos 3D
SOT-23 (DBV) 6 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.

Si tiene preguntas sobre la calidad, el paquete o el pedido de productos de TI, consulte el soporte de TI. ​​​​​​​​​​​​​​

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