Texas Instruments
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UCC2804PW
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UCC2804PW

Basic Information Overview

  • Category: Integrated Circuit (IC)
  • Use: Power Management
  • Characteristics: PWM Controller
  • Package: TSSOP-16
  • Essence: Voltage Mode PWM Controller
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Input Voltage Range: 8V to 35V
  • Output Voltage Range: 0V to 5.1V
  • Operating Temperature Range: -40°C to 85°C
  • Frequency Range: 50kHz to 1MHz
  • Duty Cycle Range: 0% to 100%
  • Maximum Duty Cycle: 90%

Detailed Pin Configuration

The UCC2804PW has a total of 16 pins. The pin configuration is as follows:

  1. COMP: Compensation Pin
  2. FB: Feedback Pin
  3. VREF: Reference Voltage Pin
  4. CS: Current Sense Pin
  5. GND: Ground Pin
  6. RT/CT: Timing Resistor/Capacitor Pin
  7. SS/TR: Soft Start/Shutdown Pin
  8. VDD: Supply Voltage Pin
  9. OUT: Output Pin
  10. NC: No Connection
  11. NC: No Connection
  12. NC: No Connection
  13. NC: No Connection
  14. NC: No Connection
  15. NC: No Connection
  16. NC: No Connection

Functional Features

  • Voltage mode control with adjustable duty cycle
  • Internal soft start for controlled startup
  • Overvoltage protection
  • Undervoltage lockout
  • Error amplifier with high gain and low offset voltage
  • Precision reference voltage source
  • Current sense input for current limiting
  • Shutdown feature for power saving

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile applications - Adjustable duty cycle provides flexibility in power management - Internal soft start ensures controlled startup and protects the circuit - Overvoltage protection prevents damage to the system - Undervoltage lockout ensures proper operation under low voltage conditions

Disadvantages: - Limited maximum duty cycle of 90% may restrict certain applications - TSSOP-16 package may require careful handling during assembly

Working Principles

The UCC2804PW is a voltage mode PWM controller that regulates the output voltage by adjusting the duty cycle of the PWM signal. It compares the feedback voltage (FB) with the reference voltage (VREF) and generates an error signal. This error signal is amplified and used to control the duty cycle of the PWM signal, which in turn adjusts the output voltage.

The current sense (CS) pin monitors the current flowing through the power stage and provides feedback for current limiting. The soft start feature gradually increases the duty cycle during startup to prevent excessive inrush current.

Detailed Application Field Plans

The UCC2804PW is commonly used in various power management applications, including: - Switching Power Supplies - DC-DC Converters - LED Drivers - Battery Chargers - Motor Control Systems

Detailed and Complete Alternative Models

Some alternative models to the UCC2804PW include: - UCC2803PW: Similar specifications and features, but with a different pin configuration (14-pin TSSOP) - UC3842B: Voltage mode PWM controller with similar characteristics, but different package (PDIP-8) - TL494: PWM controller with adjustable duty cycle and similar functionality, but different package (SOIC-16)

These alternative models can be considered based on specific application requirements and availability.

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Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af UCC2804PW i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of UCC2804PW in technical solutions:

  1. Q: What is UCC2804PW? A: UCC2804PW is a pulse width modulation (PWM) controller IC commonly used in power supply applications.

  2. Q: What is the operating voltage range of UCC2804PW? A: The operating voltage range of UCC2804PW is typically between 8V and 35V.

  3. Q: Can UCC2804PW be used in both buck and boost converter topologies? A: Yes, UCC2804PW can be used in both buck and boost converter topologies.

  4. Q: What is the maximum switching frequency supported by UCC2804PW? A: The maximum switching frequency supported by UCC2804PW is typically around 500kHz.

  5. Q: Does UCC2804PW have built-in protection features? A: Yes, UCC2804PW has built-in protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown.

  6. Q: Can UCC2804PW drive external MOSFETs directly? A: No, UCC2804PW requires external MOSFET drivers to drive high-power MOSFETs.

  7. Q: What is the purpose of the error amplifier in UCC2804PW? A: The error amplifier in UCC2804PW compares the feedback voltage with a reference voltage to regulate the output voltage.

  8. Q: How does UCC2804PW handle soft-start functionality? A: UCC2804PW provides a soft-start feature through an external capacitor connected to the soft-start pin.

  9. Q: Can UCC2804PW be used in high-efficiency power supply designs? A: Yes, UCC2804PW can be used in high-efficiency power supply designs due to its low quiescent current and high switching frequency capability.

  10. Q: What are the typical applications of UCC2804PW? A: UCC2804PW is commonly used in offline flyback converters, LED drivers, battery chargers, and other power supply applications.

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