Datasheet Texas Instruments UC3842AD8 — Ficha de datos

Fabricante	Texas Instruments
Serie	UC3842A
Numero de parte	UC3842AD8

Hojas de datos

Precios

Estado

Embalaje

Paramétricos

Plan ecológico

Notas de aplicación

• Descargar
  DN-30 Programmable Electronic Circuit Breaker
  PDF, 164 Kb, Archivo publicado: sept 5, 1999
  This design note describes a programmable electronic circuit breaker that uses the UC3843A control IC to facilitate a high-speed turnoff following an overcurrent condition. This low-cost industry-standard IC contains the required protection features and drive capability in a single 8-pin device.
• Descargar
  DN-29 UC3842A Family - Frequency Foldback Technique Provides Protection
  PDF, 51 Kb, Archivo publicado: sept 5, 1999
  Excessive power dissipation can occur in switch-mode power supplies during startup and overload conditions. Many sophisticated PWM controllers provide the means for protection against these problems; however simple low-cost controllers require additional circuitry. This design note describes a circuit that uses only one additional resistor and transistor to enhance the performance of the UC3842A
• Descargar
  DN-26 UC3842A Low-Cost Start-up and Fault Protection Circuit
  PDF, 155 Kb, Archivo publicado: sept 5, 1999
  The UC1842/3/4/5 family of control ICs can implement off-line or DC-to-DC fixed-frequency current-mode control schemes with a minimal external parts count. This design note describes a circuit with low startup current (less than 0.5mA) MOSFET-compatible undervoltage lockout thresholds programmable restart-delay HICCUP fault protection auxiliary 5V precision reference and overvoltage/overtemper
• Descargar
  DN-27 UC1842/UC1842A Family - Summary of Functional Differences
  PDF, 21 Kb, Archivo publicado: sept 5, 1999
  The UC1842A/3A/4A/5A family of control ICs is a pin-for-pin compatible improved version of the UC3842/3/4/5 family. Providing the necessary features to control current-mode switched-mode power supplies this device has been improved for higher frequency off-line power supplies. This new A series of controllers UC1842A/43A/44A/45A is superior to its predecessors in startup current requirements
• Descargar
  DN-40 The Effects of Oscillator Discharge Current Variations on Maximum Duty
  PDF, 39 Kb, Archivo publicado: sept 5, 1999
  This design note details programming frequency and maximum duty cycle using the UC3842 and UC3842-A PWM oscillator ICs. Simplified equations are used to develop obtainable ranges for parameters over IC tolerances.
• Descargar
  DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode
  PDF, 66 Kb, Archivo publicado: sept 5, 1999
  This design note explains the differences between voltage-mode and current-mode switching power supply topologies. It includes a circuit diagram for each mode and suggests criteria for choosing which mode to use.
• Descargar
  UCC38C42 Family of High-Speed BiCMOS Current-Mode PWM Controllers
  PDF, 280 Kb, Archivo publicado: feb 7, 2002
  Since their introduction in the mid 1980?s the bipolar UC3842 family of Pulse width modulation (PWM)controllers has grown to become the most widely-used control strategy in the power supply industry. [1] The reasons for success are quite clear the devices feature an elegantly simple yet very effective control architecture they use only 8 pins they can drive MOSFET gates directly and they offer
• Descargar
  U-111 Practical Considerations in Current Mode Power Supplies
  PDF, 787 Kb, Archivo publicado: sept 5, 1999
  This application note explains the numerous PWM functions and ways to maximize their usefulness. It covers practical circuit design considerations such as slope compensation gate drive circuitry external control functions synchronization and paralleling current-mode controlled modules. Circuit diagrams and simplified equations are included.
• Descargar
  DN-42A Design Considerations for Transitioning from UC3842 to the New UCC3802
  PDF, 42 Kb, Archivo publicado: sept 5, 1999
  The UCC3802 offers numerous advantages that allow the power supply design engineer to meet requirements for lower power for battery-operated equipment higher switching frequencies for reduced magnetics size higher levels of circuit integration for improved reliability and lower cost. The UCC3802 family of devices is pin-out compatible with the UC3842 and UC3842A families; however it is not plu
• Descargar
  Conditioning a Switch-mode Power Supply Current Signal Using TI Op Amps
  PDF, 61 Kb, Archivo publicado: marzo 23, 2000
  The switch-mode power supply primary current is often sensed using a power resistor. Using an op amp to amplify the current-sense signal can reduce cost and improve noise performance and efficiency. This report reviews the advantages of using an op amp circuit and analyzes the design criteria needed to choose the proper op amp.
• Descargar
  Understanding Buck-Boost Power Stages in Switchmode Power Supplies (Rev. A)
  PDF, 363 Kb, Revisión: A, Archivo publicado: mayo 28, 2002

Linea modelo

Clasificación del fabricante

• Semiconductors > Power Management > Offline and Isolated DC/DC Controllers and Converters > PWM and Resonant Controller