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

UC2902

ACTIVO

Controlador de carga compartida de 20 V y -40 °C a 85 °C

Detalles del producto

Vin (max) (V) 20 Operating temperature range (°C) -40 to 85 Control mode Voltage Topology Buck, Flyback Rating Catalog Features Load Sharing, Programmable loop compensation, Remote Sensing, Under Voltage Protection
Vin (max) (V) 20 Operating temperature range (°C) -40 to 85 Control mode Voltage Topology Buck, Flyback Rating Catalog Features Load Sharing, Programmable loop compensation, Remote Sensing, Under Voltage Protection
PDIP (P) 8 92.5083 mm² 9.81 x 9.43 SOIC (D) 8 29.4 mm² 4.9 x 6
  • 2.7-V to 20-V Operation
  • 8-Pin Package
  • Requires Minimum Number of External Components
  • Compatible with Existing Power Supply Designs
    Incorporating Remote Output Voltage Sensin
  • Differential Share Bus
  • Precision Current Sense Amplifier (40 Gain)
  • UVLO (Undervoltage Lockout) Circuitry
  • User Programmable Share Loop Compensation
  • APPLICATIONS
    • Paralelled Power Supplies

  • 2.7-V to 20-V Operation
  • 8-Pin Package
  • Requires Minimum Number of External Components
  • Compatible with Existing Power Supply Designs
    Incorporating Remote Output Voltage Sensin
  • Differential Share Bus
  • Precision Current Sense Amplifier (40 Gain)
  • UVLO (Undervoltage Lockout) Circuitry
  • User Programmable Share Loop Compensation
  • APPLICATIONS
    • Paralelled Power Supplies

The UC3902 load share controller is an 8-pin device that balances the current drawn from independent, paralleled power supplies. Load sharing is accomplished by adjusting each supplies’ output current to a level proportional to the voltage on a share bus.

The master power supply, which is automatically designated as the supply that regulates to the highest voltage, drives the share bus with a voltage proportional to its output current. The UC3902 trims the output voltage of the other paralleled supplies so that they each support their share of the load current. Typically, each supply is designed for the same current level although that is not necessary for use with the UC3902. By appropriately scaling the current sense resistor, supplies with different output current capability can be paralleled with each supply providing the same percentage of their output current capability for a particular load.

A differential line is used for the share bus to maximize noise immunity and accommodate different voltage drops in each power converter’s ground return line. Trimming of each converter’s output voltage is accomplished by injecting a small current into the output voltage sense line, which requires a small resistance (typically 20 Ω to 100 Ω) to be inserted.

The UC3902 load share controller is an 8-pin device that balances the current drawn from independent, paralleled power supplies. Load sharing is accomplished by adjusting each supplies’ output current to a level proportional to the voltage on a share bus.

The master power supply, which is automatically designated as the supply that regulates to the highest voltage, drives the share bus with a voltage proportional to its output current. The UC3902 trims the output voltage of the other paralleled supplies so that they each support their share of the load current. Typically, each supply is designed for the same current level although that is not necessary for use with the UC3902. By appropriately scaling the current sense resistor, supplies with different output current capability can be paralleled with each supply providing the same percentage of their output current capability for a particular load.

A differential line is used for the share bus to maximize noise immunity and accommodate different voltage drops in each power converter’s ground return line. Trimming of each converter’s output voltage is accomplished by injecting a small current into the output voltage sense line, which requires a small resistance (typically 20 Ω to 100 Ω) to be inserted.

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Documentación técnica

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Tipo Título Fecha
* Data sheet Load Share Controllers datasheet (Rev. E) 28 jul 2011
User guide UCC39002 Advanced Load-Share Controller User's Guide, HPA027A (Rev. A) 09 feb 2004
Application note U-163 The UC3902 Load Share Controller and its Performance in Distributed Power (Rev. A) 13 dic 2002
Application note U-129 UC3907 Load Share IC Simplifies Parallel Power Supply Design 05 sep 1999

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

UCC39002EVM — Módulo de evaluación UCC39002

The UCC39002 is an advanced, high-performance load-share controller that provides all the necessary functions to parallel multiple independent power supplies or dc-to-dc modules. This load-share circuit is based upon the automatic master/slave architecture utilized in the UC3902 and UC3907 (...)

Guía del usuario: PDF
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
PDIP (P) 8 Ultra Librarian
SOIC (D) 8 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

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