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L4984D
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L4984D

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - High voltage flyback controller - Designed for offline power supplies - Provides precise control of the output voltage and current - Enables efficient power conversion

Package: SO-16 (Small Outline 16-pin package)

Essence: The L4984D is a high voltage flyback controller IC used in offline power supplies. It offers precise control over the output voltage and current, ensuring efficient power conversion.

Packaging/Quantity: The L4984D is available in a SO-16 package, which contains 1 IC per package.

Specifications

  • Input Voltage Range: 8V to 35V
  • Output Voltage Range: Up to 450V
  • Maximum Output Current: 2A
  • Frequency Range: 20kHz to 200kHz
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L4984D has a total of 16 pins. Here is the detailed pin configuration:

  1. VCC: Supply voltage input
  2. GND: Ground reference
  3. CS: Current sense input
  4. FB: Feedback input for output voltage regulation
  5. COMP: Compensation pin for loop stability
  6. RT/CT: Timing resistor/capacitor connection
  7. DRAIN: High-voltage power MOSFET drain connection
  8. SOURCE: High-voltage power MOSFET source connection
  9. VREF: Reference voltage output
  10. SYNC: Synchronization input for multiple ICs
  11. SS/TR: Soft-start/tracking pin
  12. VSENSE: Voltage sense input
  13. NC: No connection
  14. NC: No connection
  15. NC: No connection
  16. NC: No connection

Functional Features

  • High voltage flyback controller for offline power supplies
  • Precise control of output voltage and current
  • Adjustable frequency range for optimal performance
  • Soft-start function for smooth startup
  • Synchronization capability for multiple ICs in parallel operation
  • Overvoltage protection to safeguard the system
  • Current sense input for accurate current monitoring

Advantages and Disadvantages

Advantages: - Provides precise control over output voltage and current - Enables efficient power conversion - Offers synchronization capability for parallel operation - Incorporates overvoltage protection - Compact SO-16 package for space-saving designs

Disadvantages: - Limited maximum output current (2A) - Requires external timing resistor and capacitor for frequency adjustment

Working Principles

The L4984D operates as a high voltage flyback controller in offline power supplies. It regulates the output voltage and current by controlling the switching of a high-voltage power MOSFET. The IC uses a feedback mechanism to adjust the duty cycle of the switching waveform, ensuring the desired output voltage is maintained. The soft-start feature gradually increases the duty cycle during startup to prevent excessive inrush current. The synchronization input allows multiple ICs to operate in parallel, sharing the load and improving overall system efficiency.

Detailed Application Field Plans

The L4984D is commonly used in various applications, including:

  1. Offline power supplies for consumer electronics
  2. LED lighting systems
  3. Battery chargers
  4. Industrial power supplies
  5. Telecom power systems

Detailed and Complete Alternative Models

  1. L4984: Similar to L4984D but without synchronization capability
  2. L4984PD: Enhanced version with additional protection features
  3. L4984AD: Low-power variant suitable for battery-powered applications
  4. L4984HD: High-current variant with increased maximum output current

These alternative models offer similar functionality to the L4984D but may have additional features or variations in specifications.

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Sebutkan 10 pertanyaan dan jawaban umum terkait penerapan L4984D dalam solusi teknis

Sure! Here are 10 common questions and answers related to the application of L4984D in technical solutions:

  1. Q: What is L4984D? A: L4984D is a high-voltage, high-current PWM controller designed for offline flyback converters.

  2. Q: What are the key features of L4984D? A: The key features of L4984D include adjustable frequency, soft-start function, overvoltage protection, and current limiting.

  3. Q: What is the typical application of L4984D? A: L4984D is commonly used in power supply applications, such as LED lighting, battery chargers, and industrial equipment.

  4. Q: How does L4984D control the output voltage? A: L4984D uses pulse width modulation (PWM) technique to control the duty cycle of the switching transistor, thereby regulating the output voltage.

  5. Q: Can L4984D handle high voltages? A: Yes, L4984D is designed to handle high input voltages up to several hundred volts.

  6. Q: Does L4984D have built-in protection features? A: Yes, L4984D has built-in protections like overvoltage protection, overcurrent protection, and thermal shutdown.

  7. Q: Can L4984D operate in continuous or discontinuous mode? A: L4984D can operate in both continuous and discontinuous modes, depending on the load conditions.

  8. Q: Is L4984D compatible with various types of power MOSFETs? A: Yes, L4984D is compatible with a wide range of power MOSFETs, allowing flexibility in design.

  9. Q: Can L4984D be used in both isolated and non-isolated power supplies? A: Yes, L4984D can be used in both isolated and non-isolated power supply topologies.

  10. Q: Are there any evaluation boards or reference designs available for L4984D? A: Yes, several evaluation boards and reference designs are available from the manufacturer to help with the implementation of L4984D in different applications.

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