L4981B

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Factor Correction (PFC) controller
• Characteristics: High efficiency, low standby power consumption
• Package: SO-16
• Essence: Regulates the input current to improve power factor and reduce harmonic distortion
• Packaging/Quantity: Available in tape and reel packaging, quantity depends on supplier

Specifications

• Input Voltage Range: 85V to 265V
• Output Voltage Range: 400V to 800V
• Maximum Output Power: 300W
• Operating Frequency: 65kHz to 115kHz
• Standby Power Consumption: Less than 100mW
• Protection Features: Overvoltage, overcurrent, and overtemperature protection

Detailed Pin Configuration

The L4981B IC has a total of 16 pins. The pin configuration is as follows:

1. VCC: Power supply voltage input
2. GND: Ground reference
3. COMP: Compensation pin for feedback control loop
4. CS: Current sense input for regulating the output current
5. INV: Inverting input of the error amplifier
6. FB: Feedback pin for voltage regulation
7. RT/CT: Timing components connection for frequency setting
8. SS/TR: Soft-start and shutdown control pin
9. OSC: Oscillator timing capacitor connection
10. UVLO: Undervoltage lockout pin
11. SD: Shutdown control pin
12. VREF: Reference voltage output
13. OUT: Output pin for connecting external power MOSFET
14. NC: No connection
15. NC: No connection
16. NC: No connection

Functional Features

• Power Factor Correction: Improves power factor by regulating the input current waveform
• High Efficiency: Reduces power losses and improves overall system efficiency
• Low Standby Power Consumption: Minimizes power consumption during standby mode
• Overvoltage Protection: Safeguards the system from excessive voltage levels
• Overcurrent Protection: Prevents damage due to excessive output current
• Overtemperature Protection: Ensures safe operation by monitoring temperature

Advantages and Disadvantages

Advantages: - High efficiency leads to energy savings - Improved power factor reduces harmonic distortion - Compact SO-16 package allows for space-saving designs - Wide input voltage range enhances versatility

Disadvantages: - Limited maximum output power of 300W - Requires external power MOSFET for operation - Not suitable for applications requiring higher output voltages

Working Principles

The L4981B is a power factor correction controller that operates in Continuous Conduction Mode (CCM). It regulates the input current to achieve a near-unity power factor and reduce harmonic distortion. The IC uses an internal error amplifier, which compares the feedback voltage with a reference voltage to control the duty cycle of the power MOSFET. This regulation ensures that the output voltage remains within the desired range while maintaining high efficiency.

Detailed Application Field Plans

The L4981B is commonly used in various power supply applications, including:

1. Switched-Mode Power Supplies (SMPS)
2. LED Lighting Systems
3. Industrial Power Equipment
4. Consumer Electronics
5. Telecommunications Equipment

In SMPS, the L4981B helps improve power factor and overall efficiency, making it suitable for applications such as computer power supplies, televisions, and audio amplifiers. In LED lighting systems, it enables efficient power conversion and dimming control. Industrial power equipment, consumer electronics, and telecommunications equipment benefit from its high efficiency and compact design.

Detailed and Complete Alternative Models

1. L6562A: PFC controller with similar features and performance
2. UCC28070: PFC controller with higher output power capability
3. FAN7527B: PFC controller with integrated power MOSFET driver
4. IRS2980: PFC controller specifically designed for LED lighting applications
5. NCP1653: PFC controller with built-in protection features

These alternative models offer similar functionality and can be considered as alternatives to the L4981B based on specific application requirements.

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