ON Semiconductor
La imagen puede ser una representación.
Consulte las especificaciones para obtener detalles del producto.
UC2842ANG
Ver Detalle Hojas de datos

UC2842ANG

Basic Information Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Mode PWM Controller
  • Characteristics:
    • High-performance PWM controller for power supply applications
    • Provides precise control of switching power supplies
    • Offers protection features for enhanced reliability
  • Package: DIP-8 (Dual In-line Package, 8 pins)
  • Essence: Regulates and controls the output voltage of power supplies
  • Packaging/Quantity: Typically sold in reels or tubes containing multiple units

Specifications

  • Input Voltage Range: 7.6V to 30V
  • Output Voltage Range: 0V to 5.1V
  • Operating Temperature Range: -40°C to 85°C
  • Maximum Duty Cycle: 100%
  • Oscillator Frequency Range: 50kHz to 500kHz
  • Output Current: Up to 1A
  • Error Amplifier Gain Bandwidth Product: 2MHz

Detailed Pin Configuration

  1. VREF: Reference voltage input
  2. COMP: Error amplifier output
  3. FB: Feedback pin for regulating output voltage
  4. GND: Ground reference
  5. CS: Current sense input
  6. RT/CT: Timing components connection
  7. OUT: Output pin for driving external power switch
  8. VCC: Power supply input

Functional Features

  • Voltage mode control with adjustable duty cycle
  • Internal oscillator for generating switching frequency
  • Error amplifier for precise regulation
  • Soft-start function for gradual power-up
  • Overcurrent protection for enhanced safety
  • Under-voltage lockout (UVLO) for reliable operation

Advantages and Disadvantages

Advantages: - High-performance controller for power supply applications - Precise control of output voltage - Protection features enhance reliability - Adjustable duty cycle allows flexibility in power supply design

Disadvantages: - Limited output current capability (up to 1A) - Requires external components for complete power supply implementation

Working Principles

The UC2842ANG is a voltage mode PWM controller that regulates the output voltage of power supplies. It operates by comparing the feedback voltage (FB) with a reference voltage (VREF) and adjusts the duty cycle of the output waveform accordingly. This control mechanism ensures precise regulation of the output voltage.

The IC incorporates an internal oscillator that generates a switching frequency within a specified range. The timing components connected to the RT/CT pin determine the frequency of operation. By adjusting these components, the switching frequency can be tailored to meet specific requirements.

The error amplifier compares the feedback voltage with the reference voltage and amplifies the difference. This amplified error signal is then used to adjust the duty cycle of the output waveform, thereby regulating the output voltage.

The UC2842ANG also provides protection features such as overcurrent protection and under-voltage lockout (UVLO). These features enhance the reliability and safety of the power supply.

Detailed Application Field Plans

The UC2842ANG is widely used in various power supply applications, including:

  1. Switching Power Supplies: The IC is commonly employed in switch-mode power supplies (SMPS) to regulate the output voltage efficiently. Its precise control and protection features make it suitable for a wide range of SMPS designs.

  2. LED Drivers: With its adjustable duty cycle and high-performance characteristics, the UC2842ANG is utilized in LED driver circuits. It enables accurate control of LED brightness and ensures stable operation.

  3. Battery Chargers: The IC finds application in battery charger circuits, where it regulates the charging voltage and current. Its protection features help prevent overcharging and ensure safe charging of batteries.

  4. Industrial Power Supplies: The UC2842ANG is employed in industrial power supply units, providing reliable and efficient voltage regulation. Its versatility makes it suitable for various industrial applications.

Detailed and Complete Alternative Models

  1. UC3842ANG: Similar to UC2842ANG, but with higher output current capability (up to 0.5A)
  2. UC3843ANG: Enhanced version of UC3842ANG with additional features like adjustable soft-start and shutdown functions
  3. TL494CN: PWM controller with similar functionality, but available in a different package (DIP-16)

These alternative models offer similar functionality and can be used as substitutes for the UC2842ANG depending on specific requirements.

Word count: 599 words

Enumere 10 preguntas y respuestas comunes relacionadas con la aplicación de UC2842ANG en soluciones técnicas

Sure! Here are 10 common questions and answers related to the application of UC2842ANG in technical solutions:

  1. Q: What is UC2842ANG? A: UC2842ANG is a pulse width modulation (PWM) controller IC commonly used in power supply applications.

  2. Q: What is the purpose of UC2842ANG? A: UC2842ANG is used to regulate the output voltage of a power supply by controlling the duty cycle of the PWM signal.

  3. Q: What is the operating voltage range of UC2842ANG? A: The operating voltage range of UC2842ANG is typically between 7V and 30V.

  4. Q: How does UC2842ANG control the output voltage? A: UC2842ANG compares the feedback voltage from the power supply with a reference voltage and adjusts the duty cycle accordingly to maintain a stable output voltage.

  5. Q: Can UC2842ANG be used in both buck and boost converter configurations? A: Yes, UC2842ANG can be used in both buck and boost converter configurations, as well as other topologies like flyback and forward converters.

  6. Q: What is the maximum switching frequency of UC2842ANG? A: The maximum switching frequency of UC2842ANG is typically around 500kHz.

  7. Q: Does UC2842ANG have built-in protection features? A: Yes, UC2842ANG has built-in protection features such as overcurrent protection and thermal shutdown.

  8. Q: Can UC2842ANG drive high-power loads directly? A: No, UC2842ANG is a controller IC and requires external power devices such as MOSFETs or transistors to drive high-power loads.

  9. Q: Are there any application notes or reference designs available for UC2842ANG? A: Yes, the manufacturer of UC2842ANG provides application notes and reference designs that can help in implementing the IC in various power supply applications.

  10. Q: What are the typical applications of UC2842ANG? A: UC2842ANG is commonly used in switch-mode power supplies (SMPS), battery chargers, LED drivers, and other applications where precise voltage regulation is required.

Please note that the answers provided here are general and may vary depending on specific design requirements and datasheet specifications.