Texas Instruments
Imej mungkin representasi.
Lihat spesifikasi untuk butiran produk.
UCC3817D
Lihat Butiran Helaian data

UCC3817D - English Editing Encyclopedia Entry

Product 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 regulation of output voltage - Offers protection features for safe operation

Package: SOIC-14

Essence: The UCC3817D is a voltage mode PWM controller that is widely used in switch-mode power supplies. It ensures accurate regulation of the output voltage and incorporates various protection features to ensure safe operation.

Packaging/Quantity: The UCC3817D is available in a standard SOIC-14 package. It is typically sold in reels or tubes containing multiple units.

Specifications

  • Input Voltage Range: 8V to 18V
  • Output Voltage Range: 0V to 5V
  • Operating Temperature Range: -40°C to 85°C
  • Maximum Duty Cycle: 100%
  • Oscillator Frequency Range: 50kHz to 1MHz
  • Output Current: 200mA

Pin Configuration

The UCC3817D has a total of 14 pins, which are assigned specific functions as follows:

  1. COMP: Compensation pin for external compensation network.
  2. FB: Feedback pin for regulating the output voltage.
  3. RT/CT: Timing resistor/capacitor connection for setting oscillator frequency.
  4. GND: Ground reference for the IC.
  5. VREF: Reference voltage output for feedback and error amplifier.
  6. VCC: Power supply input for the IC.
  7. SYNC: Synchronization input for external clock signal.
  8. OSC: Oscillator output pin.
  9. SS/TR: Soft-start and tracking control pin.
  10. INV: Inverting input of the error amplifier.
  11. EAOUT: Error amplifier output.
  12. CS: Current sense input for current mode control.
  13. VSENSE: Voltage sense input for voltage mode control.
  14. DRV: Gate driver output for driving external power MOSFET.

Functional Features

  1. Voltage Mode Control: The UCC3817D utilizes voltage mode control to regulate the output voltage of switch-mode power supplies accurately.
  2. Protection Features: It incorporates various protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown to ensure safe operation and prevent damage to the circuit.
  3. Soft-Start Function: The soft-start feature allows for a gradual increase in output voltage during startup, reducing stress on components and preventing overshoot.
  4. Synchronization Capability: The SYNC pin enables synchronization with an external clock signal, allowing for precise timing control in multi-phase applications.
  5. Error Amplifier: The built-in error amplifier provides high gain and accuracy for feedback control, ensuring stable and reliable operation.

Advantages and Disadvantages

Advantages: - Precise regulation of output voltage - Incorporates protection features for safe operation - Soft-start function reduces stress on components - Synchronization capability for multi-phase applications - High gain and accuracy provided by the error amplifier

Disadvantages: - Limited output current capacity (200mA) - Requires external compensation network for stability

Working Principles

The UCC3817D operates based on the voltage mode control technique. It compares the feedback voltage (FB) with a reference voltage (VREF) and generates an error signal. This error signal is amplified by the error amplifier and used to adjust the duty cycle of the PWM signal. By modulating the duty cycle, the controller regulates the output voltage to match the desired value.

The soft-start function gradually increases the duty cycle during startup, preventing excessive inrush current and voltage overshoot. The protection features, such as overvoltage protection and thermal shutdown, ensure the safe operation of the power supply.

Detailed Application Field Plans

The UCC3817D is commonly used in various switch-mode power supply applications, including: - AC/DC converters - DC/DC converters - LED drivers - Battery chargers - Industrial power supplies

Its precise voltage regulation, protection features, and synchronization capability make it suitable for demanding applications that require stable and efficient power conversion.

Detailed and Complete Alternative Models

  1. UCC3813D: Similar to UCC3817D but with a lower output current capacity (100mA).
  2. UCC3818D: Similar to UCC3817D but with an extended input voltage range (8V to 30V).
  3. UCC3819D: Similar to UCC3817D but with enhanced protection features and higher output current capacity (500mA).

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

Word Count: 570 words

Senaraikan 10 soalan dan jawapan biasa yang berkaitan dengan aplikasi UCC3817D dalam penyelesaian teknikal

Sure! Here are 10 common questions and answers related to the application of UCC3817D in technical solutions:

  1. Q: What is UCC3817D? A: UCC3817D is a voltage mode PWM controller IC used for regulating power supplies.

  2. Q: What are the key features of UCC3817D? A: Some key features include adjustable frequency, soft-start capability, current limiting, and overvoltage protection.

  3. Q: How does UCC3817D regulate the output voltage? A: UCC3817D uses a feedback loop to compare the output voltage with a reference voltage and adjusts the duty cycle of the PWM signal accordingly.

  4. Q: Can UCC3817D be used in both buck and boost converter topologies? A: Yes, UCC3817D can be used in both buck and boost converter topologies, as well as in flyback and forward converter configurations.

  5. Q: What is the maximum operating frequency of UCC3817D? A: The maximum operating frequency of UCC3817D is typically around 1 MHz.

  6. Q: How does the soft-start feature of UCC3817D work? A: The soft-start feature gradually increases the duty cycle of the PWM signal during startup, preventing excessive inrush current and voltage overshoot.

  7. Q: Does UCC3817D have any protection features? A: Yes, UCC3817D has built-in protection features such as overcurrent protection, overvoltage protection, and thermal shutdown.

  8. Q: Can UCC3817D operate with wide input voltage ranges? A: Yes, UCC3817D can operate with wide input voltage ranges, typically from a few volts up to several tens of volts.

  9. Q: What are the typical applications of UCC3817D? A: UCC3817D is commonly used in power supplies for computer peripherals, telecommunication equipment, industrial automation, and automotive electronics.

  10. Q: Is UCC3817D available in different package options? A: Yes, UCC3817D is available in various package options such as SOIC, PDIP, and TSSOP, providing flexibility for different PCB layouts and assembly processes.

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