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UCC2804DTR
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UCC2804DTR

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Mode PWM Controller
  • Characteristics: High-performance, low-power, current-mode PWM controller
  • Package: SOIC-8
  • Essence: Regulates and controls the output voltage of power supplies
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Input Voltage Range: 7V to 30V
  • Output Voltage Range: 0.5V to 6V
  • Operating Temperature Range: -40°C to 85°C
  • Maximum Duty Cycle: 100%
  • Oscillator Frequency Range: 50kHz to 1MHz
  • Error Amplifier Bandwidth: 10kHz
  • Soft Start Time: Adjustable

Detailed Pin Configuration

The UCC2804DTR has a total of 8 pins:

  1. VREF: Reference voltage input for error amplifier
  2. COMP: Compensation pin for error amplifier
  3. FB: Feedback pin for regulating the output voltage
  4. CS: Current sense input for current-mode control
  5. GND: Ground reference
  6. RT/CT: Timing resistor/capacitor connection for oscillator frequency adjustment
  7. OUT: Output pin for driving external power MOSFET
  8. VCC: Power supply voltage input

Functional Features

  • Voltage mode control with adjustable duty cycle
  • Current-mode control for improved stability and transient response
  • Error amplifier with adjustable gain and bandwidth
  • Soft start function for controlled startup
  • Overcurrent protection with adjustable threshold
  • Under-voltage lockout (UVLO) protection
  • Internal oscillator with adjustable frequency

Advantages and Disadvantages

Advantages: - High-performance PWM controller for efficient power supply regulation - Wide input and output voltage range for versatile applications - Adjustable features for customization and optimization - Compact SOIC-8 package for space-constrained designs

Disadvantages: - Limited maximum duty cycle of 100% - Relatively low error amplifier bandwidth compared to some other models - Requires external power MOSFET for driving the output

Working Principles

The UCC2804DTR 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) using an error amplifier. The resulting error signal is then used to adjust the duty cycle of the output waveform, which controls the power delivered to the load.

The current-mode control feature enhances stability and transient response by sensing the current flowing through the power MOSFET using the CS pin. This allows for better regulation and protection against overcurrent conditions.

The internal oscillator generates a sawtooth waveform that determines the switching frequency of the power supply. By adjusting the timing resistor (RT) and capacitor (CT) connected to the RT/CT pin, the frequency can be customized within a wide range.

Detailed Application Field Plans

The UCC2804DTR is commonly used in various applications, including:

  1. Switching Power Supplies: Used as the primary controller in flyback, forward, and boost converters.
  2. LED Lighting: Controls the output voltage and current in LED driver circuits.
  3. Battery Chargers: Regulates the charging voltage and current in battery charging systems.
  4. Motor Control: Provides PWM signals for controlling the speed and direction of motors.
  5. Audio Amplifiers: Used in Class D audio amplifiers for efficient power delivery.

Detailed and Complete Alternative Models

  1. UCC2804N: DIP-8 package variant of UCC2804DTR.
  2. UC3842: Similar voltage mode PWM controller with higher current capability.
  3. TL494: PWM controller with additional features like dead-time control and shutdown function.
  4. SG3525: PWM controller designed for high-power applications.

(Note: This list is not exhaustive and there are several other alternative models available in the market.)

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Énumérez 10 questions et réponses courantes liées à l'application de UCC2804DTR dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of UCC2804DTR in technical solutions:

  1. Q: What is UCC2804DTR? A: UCC2804DTR is a pulse width modulation (PWM) controller IC commonly used in power supply applications.

  2. Q: What is the operating voltage range of UCC2804DTR? A: The operating voltage range of UCC2804DTR is typically between 8V and 35V.

  3. Q: What is the maximum switching frequency supported by UCC2804DTR? A: UCC2804DTR can support a maximum switching frequency of up to 500kHz.

  4. Q: Can UCC2804DTR be used in both flyback and forward converter topologies? A: Yes, UCC2804DTR can be used in both flyback and forward converter topologies.

  5. Q: Does UCC2804DTR have built-in protection features? A: Yes, UCC2804DTR has built-in protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown.

  6. Q: What is the maximum duty cycle that UCC2804DTR can achieve? A: UCC2804DTR can achieve a maximum duty cycle of 100%.

  7. Q: Can UCC2804DTR operate in continuous or discontinuous conduction mode? A: UCC2804DTR can operate in both continuous and discontinuous conduction modes.

  8. Q: What is the purpose of the error amplifier in UCC2804DTR? A: The error amplifier in UCC2804DTR compares the feedback voltage with a reference voltage to regulate the output voltage.

  9. Q: Can UCC2804DTR be used in high-power applications? A: Yes, UCC2804DTR can be used in high-power applications by using external power devices such as MOSFETs or IGBTs.

  10. Q: Are there any application notes or reference designs available for UCC2804DTR? A: Yes, Texas Instruments provides application notes and reference designs that can help in implementing UCC2804DTR in various technical solutions.

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