ON Semiconductor
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UC2842BD1R2G
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UC2842BD1R2G

Basic Information Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Mode PWM Controller
  • Characteristics:
    • High-performance current mode PWM controller
    • Designed for offline and DC-to-DC converter applications
    • Provides necessary features to implement off-line or DC-to-DC fixed-frequency current-mode control schemes
  • Package: SOIC-8
  • Essence: The UC2842BD1R2G is a voltage mode PWM controller that offers high-performance current mode control for various power supply applications.
  • Packaging/Quantity: Available in tape and reel packaging with 2500 units per reel.

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: ±1A
  • Error Amplifier Voltage Gain: 70dB
  • Total Quiescent Current: 17mA

Detailed Pin Configuration

The UC2842BD1R2G has the following pin configuration:

  1. VREF: Reference voltage output
  2. COMP: Error amplifier output
  3. FB: Feedback input
  4. GND: Ground
  5. CS: Current sense input
  6. RT/CT: Timing resistor/capacitor connection
  7. OUT: Output
  8. VCC: Supply voltage input

Functional Features

  • Voltage mode control with current sensing capability
  • Internal oscillator with frequency adjustment
  • Adjustable duty cycle
  • Soft-start function for controlled startup
  • Overcurrent protection
  • Undervoltage lockout
  • Error amplifier with high voltage gain

Advantages and Disadvantages

Advantages: - High-performance current mode control - Wide input voltage range - Adjustable frequency and duty cycle - Comprehensive protection features

Disadvantages: - Limited output current capability (±1A) - Requires external components for operation

Working Principles

The UC2842BD1R2G operates on the principle of voltage mode control. It compares the feedback voltage from the output with a reference voltage to generate an error signal. This error signal is amplified and used to adjust the duty cycle of the PWM signal, which controls the power delivered to the load. The current sensing feature allows for accurate current regulation.

Detailed Application Field Plans

The UC2842BD1R2G is commonly used in various power supply applications, including:

  1. Offline Power Supplies: Used in AC-to-DC converters for applications such as televisions, computer monitors, and home appliances.
  2. DC-to-DC Converters: Employed in voltage step-up or step-down applications, such as battery chargers, LED drivers, and automotive electronics.
  3. Switching Regulators: Utilized in high-efficiency voltage regulators for industrial equipment, telecommunications, and renewable energy systems.

Detailed and Complete Alternative Models

  1. UC3842B: Similar voltage mode PWM controller with extended temperature range (-40°C to 105°C).
  2. UC2843B: Voltage mode PWM controller with additional features like adjustable dead time and shutdown function.
  3. UC3844B: Current mode PWM controller with higher output current capability (±1.5A) and wider input voltage range.

These alternative models offer similar functionality and can be considered based on specific application requirements.

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Enumere 10 preguntas y respuestas comunes relacionadas con la aplicación de UC2842BD1R2G en soluciones técnicas

Sure! Here are 10 common questions and answers related to the application of UC2842BD1R2G in technical solutions:

Q1: What is UC2842BD1R2G? A1: UC2842BD1R2G is a specific model of integrated circuit (IC) used for controlling power supply circuits.

Q2: What are the main features of UC2842BD1R2G? A2: Some key features of UC2842BD1R2G include adjustable frequency, soft-start capability, cycle-by-cycle current limiting, and a wide input voltage range.

Q3: How can UC2842BD1R2G be used in power supply applications? A3: UC2842BD1R2G can be used as a controller in various power supply applications, such as switch-mode power supplies (SMPS), battery chargers, LED drivers, and motor control circuits.

Q4: What is the maximum input voltage that UC2842BD1R2G can handle? A4: UC2842BD1R2G has a wide input voltage range, typically up to 30V.

Q5: Can UC2842BD1R2G operate at high frequencies? A5: Yes, UC2842BD1R2G can operate at frequencies ranging from a few hundred kilohertz to several megahertz.

Q6: Does UC2842BD1R2G have built-in protection features? A6: Yes, UC2842BD1R2G provides protection features like overvoltage protection (OVP), undervoltage lockout (UVLO), and thermal shutdown.

Q7: How does UC2842BD1R2G achieve soft-start capability? A7: UC2842BD1R2G incorporates a soft-start circuit that gradually ramps up the output voltage during startup, reducing stress on components.

Q8: Can UC2842BD1R2G regulate both positive and negative voltages? A8: No, UC2842BD1R2G is primarily designed for regulating positive voltages. For negative voltage regulation, a separate circuit or an alternative IC may be required.

Q9: What are the typical applications of UC2842BD1R2G in motor control? A9: UC2842BD1R2G can be used in motor control applications such as brushless DC (BLDC) motor drives, stepper motor drivers, and servo motor controllers.

Q10: Is UC2842BD1R2G suitable for low-power applications? A10: Yes, UC2842BD1R2G is suitable for a wide range of power levels, including low-power applications, due to its adjustable frequency and current limiting capabilities.

Please note that these answers are general and may vary depending on specific design requirements and application scenarios.