Texas Instruments
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UCC3817APWR
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UCC3817APWR

Basic Information Overview

  • Category: Integrated Circuit (IC)
  • Use: Voltage Mode PWM Controller
  • Characteristics: High-performance, low-power, precision control
  • Package: TSSOP-14
  • Essence: Power management IC
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Input Voltage Range: 4.5V to 16V
  • Output Voltage Range: 0.8V to 6V
  • Operating Temperature Range: -40°C to 85°C
  • Switching Frequency: Up to 1MHz
  • Duty Cycle Range: 0% to 100%
  • Output Current: Up to 500mA
  • Oscillator Frequency Range: 50kHz to 1MHz

Detailed Pin Configuration

The UCC3817APWR has a total of 14 pins arranged as follows:

  1. COMP: Compensation pin for external compensation network.
  2. FB: Feedback pin for voltage regulation.
  3. VREF: Reference voltage output.
  4. CS: Current sense input for current mode control.
  5. RT/CT: Timing resistor/capacitor connection for oscillator frequency setting.
  6. GND: Ground reference.
  7. SS/TR: Soft-start/Tracking pin for controlling the startup behavior.
  8. SYNC: Synchronization input for external clock synchronization.
  9. EN: Enable pin for turning the device on/off.
  10. VCC: Power supply input.
  11. DRVH: High-side gate driver output.
  12. DRVL: Low-side gate driver output.
  13. BOOT: Bootstrap capacitor connection for high-side gate driver.
  14. VIN: Input voltage.

Functional Features

  • Voltage mode control with adjustable frequency and duty cycle.
  • Precision voltage reference for accurate regulation.
  • Current mode control for improved stability and transient response.
  • Soft-start function for controlled startup.
  • Synchronization capability for external clock synchronization.
  • Enable pin for easy on/off control.

Advantages and Disadvantages

Advantages: - High-performance voltage regulation. - Wide input and output voltage range. - Flexible frequency and duty cycle adjustment. - Excellent stability and transient response. - Low-power consumption. - Compact TSSOP package for space-constrained applications.

Disadvantages: - Limited output current capacity (up to 500mA). - Requires external compensation network for optimal performance.

Working Principles

The UCC3817APWR is a voltage mode PWM controller that regulates the output voltage based on feedback from the FB pin. It compares the feedback voltage with an internal reference voltage (VREF) and adjusts the duty cycle of the output waveform accordingly. The CS pin provides current sensing for current mode control, which enhances stability and transient response.

During startup, the soft-start function gradually increases the duty cycle to prevent excessive inrush current. The synchronization input allows the device to synchronize its switching frequency with an external clock source. The enable pin enables or disables the device as required.

Detailed Application Field Plans

The UCC3817APWR is commonly used in various power management applications, including:

  1. DC-DC converters: Used to regulate voltage levels in portable devices, automotive electronics, and industrial equipment.
  2. Power supplies: Employed in AC-DC converters and offline power supplies for efficient voltage regulation.
  3. LED lighting: Enables precise control of LED driver circuits for optimal brightness and efficiency.
  4. Battery chargers: Utilized in battery charging circuits to maintain accurate charging profiles.
  5. Motor control: Facilitates precise control of motor speed and torque in motor drive applications.

Detailed and Complete Alternative Models

Some alternative models that can be considered as alternatives to the UCC3817APWR are:

  1. LM5039: High-voltage PWM controller with integrated high-side and low-side gate drivers.
  2. LT1241: Precision current mode PWM controller with wide input voltage range.
  3. MAX668: Dual-output PWM controller with adjustable frequency and duty cycle.
  4. UC3842: Current mode PWM controller with adjustable frequency and duty cycle.
  5. TPS5430: Synchronous buck converter controller with integrated MOSFET drivers.

These alternative models offer similar functionality and can be used as substitutes depending on specific application requirements.

In conclusion, the UCC3817APWR is a high-performance voltage mode PWM controller that provides precise voltage regulation in various power management applications. Its compact package, flexible features, and wide input/output voltage range make it a versatile choice for designers.

Énumérez 10 questions et réponses courantes liées à l'application de UCC3817APWR dans les solutions techniques

Sure! Here are 10 common questions and answers related to the application of UCC3817APWR:

  1. Q: What is UCC3817APWR? A: UCC3817APWR is a voltage mode PWM controller IC used in power supply applications.

  2. Q: What is the input voltage range for UCC3817APWR? A: The input voltage range for UCC3817APWR is typically between 8V and 18V.

  3. Q: What is the output voltage range of UCC3817APWR? A: The output voltage range of UCC3817APWR depends on the external components used, but it can be adjusted from a few volts up to several tens of volts.

  4. Q: How does UCC3817APWR regulate the output voltage? A: UCC3817APWR uses a feedback loop to compare the output voltage with a reference voltage and adjusts the duty cycle of the PWM signal to maintain the desired output voltage.

  5. Q: Can UCC3817APWR handle high current loads? A: No, UCC3817APWR is a controller IC and cannot handle high current loads directly. It requires external power MOSFETs or other power devices to handle high currents.

  6. Q: What is the maximum switching frequency of UCC3817APWR? A: The maximum switching frequency of UCC3817APWR is typically around 500kHz.

  7. Q: Does UCC3817APWR have built-in protection features? A: Yes, UCC3817APWR has built-in protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown.

  8. Q: Can UCC3817APWR operate in a wide temperature range? A: Yes, UCC3817APWR can operate in a wide temperature range, typically from -40°C to 85°C.

  9. Q: What type of control does UCC3817APWR use? A: UCC3817APWR uses voltage mode control, where the output voltage is regulated by adjusting the duty cycle of the PWM signal.

  10. Q: Can UCC3817APWR be used in both step-up and step-down converter applications? A: Yes, UCC3817APWR can be used in both step-up (boost) and step-down (buck) converter applications by configuring the external components accordingly.

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