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L4989D
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L4989D

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Power Management
  • Characteristics: High efficiency, low power consumption
  • Package: DIP-16 (Dual In-line Package with 16 pins)
  • Essence: Voltage Regulator
  • Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

  • Input Voltage Range: 4.5V to 40V
  • Output Voltage Range: 1.2V to 37V
  • Maximum Output Current: 1.5A
  • Quiescent Current: 10mA
  • Switching Frequency: 200kHz
  • Operating Temperature Range: -40°C to +125°C

Detailed Pin Configuration

The L4989D IC has a total of 16 pins arranged as follows:

  1. VCC: Power supply input
  2. GND: Ground reference
  3. COMP: Compensation pin for feedback control
  4. FB: Feedback voltage input
  5. CS: Current sense input
  6. SS/TR: Soft-start and tracking control
  7. INV: Inverting input for error amplifier
  8. VREF: Reference voltage output
  9. OSC: Oscillator frequency setting
  10. SYNC: Synchronization input
  11. SD: Shutdown control input
  12. OUT: Power output
  13. PGND: Power ground reference
  14. NC: No connection
  15. NC: No connection
  16. NC: No connection

Functional Features

  • High efficiency voltage regulation
  • Wide input voltage range
  • Adjustable output voltage
  • Overcurrent protection
  • Thermal shutdown protection
  • Soft-start and tracking control
  • Synchronization capability

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power consumption - Wide input voltage range allows for versatile applications - Adjustable output voltage provides flexibility - Overcurrent and thermal shutdown protection enhance reliability - Soft-start and tracking control improve system stability - Synchronization capability enables multi-device operation

Disadvantages: - Limited maximum output current (1.5A) - Requires external components for complete functionality - Relatively high quiescent current (10mA)

Working Principles

The L4989D is a voltage regulator IC that utilizes a pulse width modulation (PWM) control scheme to regulate the output voltage. It operates by comparing the feedback voltage with a reference voltage and adjusting the duty cycle of the internal power switch accordingly. This regulates the output voltage within the desired range. The IC also incorporates various protection features to ensure safe operation.

Detailed Application Field Plans

The L4989D is commonly used in various applications, including but not limited to:

  1. Power supplies for industrial equipment
  2. Automotive electronics
  3. Telecommunications systems
  4. Consumer electronics
  5. LED lighting systems
  6. Battery charging circuits
  7. Motor control circuits

Detailed and Complete Alternative Models

  1. L4988D: Similar specifications and features, but with a different pin configuration.
  2. LM2576T-ADJ: Buck converter IC with adjustable output voltage and higher maximum output current.
  3. LT1083CP: Linear voltage regulator IC with adjustable output voltage and higher maximum output current.
  4. TPS5430: Switching regulator IC with similar specifications and features, but in a different package.
  5. MC34063A: Step-up/step-down switching regulator IC with adjustable output voltage and lower maximum output current.

These alternative models offer similar functionality and can be considered as substitutes for the L4989D depending on specific requirements.

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技術ソリューションにおける L4989D の適用に関連する 10 件の一般的な質問と回答をリストします。

Sure! Here are 10 common questions and answers related to the application of L4989D in technical solutions:

  1. Q: What is L4989D? A: L4989D is a high-voltage, high-current power factor corrector (PFC) controller IC used in power supply applications.

  2. Q: What is the purpose of L4989D in technical solutions? A: L4989D is used to improve power factor correction in AC-DC power supplies, ensuring efficient energy transfer and compliance with regulatory standards.

  3. Q: How does L4989D achieve power factor correction? A: L4989D uses a boost converter topology to shape the input current waveform, aligning it with the input voltage waveform and improving power factor.

  4. Q: What is the maximum input voltage supported by L4989D? A: L4989D can handle input voltages up to 600V, making it suitable for a wide range of industrial and consumer applications.

  5. Q: Can L4989D operate at high switching frequencies? A: Yes, L4989D supports high-frequency operation up to 300 kHz, allowing for compact and efficient power supply designs.

  6. Q: Does L4989D provide overvoltage protection? A: Yes, L4989D includes built-in overvoltage protection features to safeguard the power supply and connected devices.

  7. Q: Can L4989D be used in offline or isolated power supply designs? A: Yes, L4989D is suitable for both offline and isolated power supply topologies, providing flexibility in system design.

  8. Q: Does L4989D offer any feedback control mechanisms? A: Yes, L4989D incorporates voltage feedback loops to regulate the output voltage and maintain stable power supply operation.

  9. Q: What are the typical applications of L4989D? A: L4989D is commonly used in LED lighting, motor drives, industrial power supplies, and other applications requiring power factor correction.

  10. Q: Are there any evaluation boards or reference designs available for L4989D? A: Yes, STMicroelectronics provides evaluation boards and reference designs to help engineers quickly prototype and implement L4989D-based solutions.

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