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UCC2817DW
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UCC2817DW

Overview

Category: Integrated Circuit (IC)

Use: Voltage Mode PWM Controller

Characteristics: - High-performance voltage mode controller - Designed for use in switch-mode power supplies - Provides precise control of output voltage and current - Offers protection features for safe operation

Package: SOIC-16

Essence: UCC2817DW is a voltage mode PWM controller that is widely used in switch-mode power supplies to regulate the output voltage and current. It offers high performance and various protection features for reliable and safe operation.

Packaging/Quantity: UCC2817DW is available in a small outline integrated circuit (SOIC) package with 16 pins. It is typically sold in reels or tubes containing multiple units.

Specifications

  • Input Voltage Range: 8V to 35V
  • Output Voltage Range: 0V to 5V
  • Operating Temperature Range: -40°C to 85°C
  • Maximum Duty Cycle: 100%
  • Oscillator Frequency Range: 50kHz to 1MHz
  • Error Amplifier Gain Bandwidth Product: 2.5MHz
  • Soft Start Time: Adjustable

Pin Configuration

UCC2817DW has the following pin configuration:

  1. COMP: Compensation Pin
  2. FB: Feedback Pin
  3. RT/CT: Timing Resistor/Capacitor Pin
  4. VREF: Reference Voltage Pin
  5. CS: Current Sense Pin
  6. GND: Ground Pin
  7. VCC: Supply Voltage Pin
  8. SYNC: Synchronization Pin
  9. SS/TR: Soft Start/Tracking Pin
  10. INV: Inverting Input Pin
  11. EAOUT: Error Amplifier Output Pin
  12. EA-: Error Amplifier Negative Input Pin
  13. EA+: Error Amplifier Positive Input Pin
  14. OSC: Oscillator Timing Capacitor Pin
  15. RT/CT: Timing Resistor/Capacitor Pin
  16. VCC: Supply Voltage Pin

Functional Features

  • Voltage Mode Control: UCC2817DW utilizes voltage mode control to regulate the output voltage and current of switch-mode power supplies. This ensures precise control and stability.
  • Protection Features: The IC incorporates various protection features such as overvoltage protection, undervoltage lockout, overcurrent protection, and thermal shutdown. These features enhance the safety and reliability of the power supply.
  • Adjustable Soft Start: UCC2817DW offers an adjustable soft start time, allowing for a controlled startup of the power supply to prevent excessive inrush current.
  • Synchronization Capability: The SYNC pin enables synchronization with an external clock signal, facilitating the coordination of multiple power supplies.

Advantages and Disadvantages

Advantages: - High-performance voltage mode controller - Precise regulation of output voltage and current - Multiple protection features for safe operation - Adjustable soft start time - Synchronization capability for coordinated operation

Disadvantages: - Limited input voltage range (8V to 35V) - Requires additional external components for complete power supply implementation

Working Principles

UCC2817DW operates based on the voltage mode control technique. It compares the feedback voltage from the FB pin with a reference voltage (VREF) to generate an error signal. This error signal is amplified by the internal error amplifier and used to adjust the duty cycle of the PWM signal. By modulating the duty cycle, the IC regulates the output voltage and current of the power supply.

The IC also incorporates protection features such as overvoltage protection, undervoltage lockout, overcurrent protection, and thermal shutdown. These features monitor the operating conditions and take appropriate actions to ensure safe operation and protect the power supply components.

Detailed Application Field Plans

UCC2817DW finds extensive application in various switch-mode power supply designs. Some of the common application fields include:

  1. AC-DC Power Supplies: UCC2817DW is used in AC-DC power supplies to convert alternating current (AC) input voltage into regulated direct current (DC) output voltage. It ensures stable and efficient power conversion.
  2. DC-DC Converters: The IC is employed in DC-DC converters to step up or step down the input voltage level as required by the load. It enables efficient voltage conversion with precise control.
  3. LED Lighting: UCC2817DW is utilized in LED lighting applications to regulate the current supplied to the LEDs, ensuring consistent brightness and extending their lifespan.
  4. Battery Chargers: The IC is employed in battery charger circuits to control the charging process and prevent overcharging or damage to the batteries.
  5. Industrial Power Supplies: UCC2817DW is widely used in industrial power supplies for various applications such as motor drives, control systems, and instrumentation.

Detailed and Complete

Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af UCC2817DW i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of UCC2817DW in technical solutions:

  1. Q: What is UCC2817DW? A: UCC2817DW is a pulse width modulation (PWM) controller IC used for controlling power supply circuits.

  2. Q: What are the key features of UCC2817DW? A: Some key features include adjustable frequency, soft-start capability, cycle-by-cycle current limiting, and overvoltage protection.

  3. Q: How does UCC2817DW help in power supply applications? A: UCC2817DW provides precise control over the switching frequency and duty cycle of power supply circuits, ensuring efficient power delivery.

  4. Q: Can UCC2817DW be used in both AC-DC and DC-DC power supplies? A: Yes, UCC2817DW can be used in both AC-DC and DC-DC power supply applications.

  5. Q: What is the maximum operating voltage range of UCC2817DW? A: The maximum operating voltage range of UCC2817DW is typically between 8V and 35V.

  6. Q: Does UCC2817DW have built-in protection features? A: Yes, UCC2817DW has built-in protection features such as overvoltage protection and cycle-by-cycle current limiting.

  7. Q: Can UCC2817DW be used in high-power applications? A: Yes, UCC2817DW can be used in high-power applications by using external power devices like MOSFETs or IGBTs.

  8. Q: How does UCC2817DW handle soft-start functionality? A: UCC2817DW incorporates a soft-start feature that gradually ramps up the output voltage during startup, preventing excessive inrush current.

  9. Q: Can UCC2817DW be used in battery charging applications? A: Yes, UCC2817DW can be used in battery charging applications by controlling the charging voltage and current.

  10. Q: Are there any application notes or reference designs available for UCC2817DW? A: Yes, Texas Instruments provides application notes and reference designs that showcase the implementation of UCC2817DW in various power supply applications.

Please note that these answers are general and may vary depending on the specific requirements and design considerations of your technical solution.