L4981B
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STMicroelectronics L4981B

Manufacturer No:
L4981B
Manufacturer:
STMicroelectronics
Package:
Tube
Description:
IC PFC CTR AV CURR 100KHZ 20DIP
Delivery:
Payment:
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Product Introduction

Overview

The L4981B, produced by STMicroelectronics, is a high-performance power factor corrector (PFC) pre-regulator integrated circuit. It is designed to achieve a very high power factor of up to 0.99, making it ideal for high-efficiency power supply applications. The L4981B is realized in BCD 60II technology and includes all the necessary control functions for designing a high-efficiency power supply with sinusoidal line current consumption. It can operate with mains voltages between 85V to 265V without any line switch.

Key Specifications

Parameter Min. Typ. Max. Unit
Supply Voltage (VCC) - - 19.5 V
Operating Ambient Temperature -40 - 125 °C
Storage Temperature -55 - 150 °C
Power Dissipation at Tamb = 70°C (DIP20) - - 1 W
Power Dissipation at Tamb = 70°C (SO20) - - 0.6 W
Initial Oscillator Frequency Accuracy 85 100 115 KHz
Gate Driver Output Peak Current (Sink) - - 2 A
Gate Driver Output Peak Current (Source) - - 1.5 A
Turn On Threshold Voltage 14.5 15.5 16.5 V
Turn Off Threshold Voltage 9 10 11 V

Key Features

  • High Power Factor: Achieves a power factor of up to 0.99.
  • Universal Input: Operates with mains voltages between 85V to 265V without any line switch.
  • Average Current Mode PWM: Maintains sinusoidal line current consumption without slope compensation.
  • Modulated Frequency Operation: The L4981B operates with modulated frequency, optimizing the size of the input filter.
  • Integrated Protections: Includes overvoltage and overcurrent protections, with the overcurrent level programmable using external resistors.
  • Soft Start and Under Voltage Lockout: Features soft start and programmable under voltage lockout with hysteresis.
  • High Current Gate Driver: Bipolar and DMOS totem pole output stage can deliver peak current in excess of 1A.
  • Load Feedforward: Allows modification of the multiplier output current proportionally to the load for faster response to load transients.

Applications

  • High-Efficiency Power Supplies: Ideal for designing high-efficiency power supplies with sinusoidal line current consumption.
  • Power Factor Correction (PFC): Used in PFC pre-regulator applications to improve power factor and reduce line current distortion.
  • Industrial and Consumer Electronics: Suitable for various industrial and consumer electronic devices requiring high power efficiency and compliance with power factor regulations.
  • LED Lighting and Power Adapters: Can be used in LED lighting systems and power adapters where high power factor and efficiency are critical.

Q & A

  1. What is the typical power factor achieved by the L4981B?

    The L4981B can achieve a power factor of up to 0.99.

  2. What is the operating voltage range of the L4981B?

    The L4981B operates with mains voltages between 85V to 265V.

  3. How does the L4981B handle frequency modulation?

    The L4981B operates with modulated frequency, which can be adjusted using an external resistor connected to the rectified line voltage.

  4. What kind of protections are integrated into the L4981B?

    The L4981B includes overvoltage and overcurrent protections, with the overcurrent level programmable using external resistors.

  5. How does the soft start feature work in the L4981B?

    The L4981B features a soft start mechanism that gradually increases the output voltage to prevent inrush currents during startup.

  6. What is the purpose of the load feedforward feature in the L4981B?

    The load feedforward feature allows the multiplier output current to be modified proportionally to the load, providing a faster response to load transients.

  7. What is the maximum gate driver output peak current of the L4981B?

    The gate driver output can deliver a peak current in excess of 1A.

  8. How is the turn-on threshold voltage programmed in the L4981B?

    The turn-on threshold voltage can be programmed using external resistors connected between specific pins and VCC or GND.

  9. What is the typical operating supply current of the L4981B after turn-on?

    The typical operating supply current after turn-on is around 12 mA.

  10. What are some common applications of the L4981B?

    The L4981B is commonly used in high-efficiency power supplies, PFC pre-regulators, industrial and consumer electronics, and LED lighting systems.

Product Attributes

Mode:Average Current
Frequency - Switching:100kHz
Current - Startup:100 µA
Voltage - Supply:14.5V ~ 19.5V
Operating Temperature:-40°C ~ 125°C
Mounting Type:Through Hole
Package / Case:20-DIP (0.300", 7.62mm)
Supplier Device Package:20-DIP
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Similar Products

Part Number L4981B L4981BD L4985B L4986B L4981A
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Product Status Obsolete Active Active Active Obsolete
Mode Average Current Average Current Continuous Conduction (CCM) Continuous Conduction (CCM) Average Current
Frequency - Switching 100kHz 100kHz 130kHz 130kHz 100kHz
Current - Startup 100 µA 100 µA 400 µA 400 µA 100 µA
Voltage - Supply 14.5V ~ 19.5V 14.5V ~ 19.5V 10V ~ 24.5V 10V ~ 24.5V 14.5V ~ 19.5V
Operating Temperature -40°C ~ 125°C -40°C ~ 125°C -40°C ~ 150°C (TJ) -40°C ~ 150°C (TJ) -40°C ~ 125°C
Mounting Type Through Hole Surface Mount Surface Mount Surface Mount Through Hole
Package / Case 20-DIP (0.300", 7.62mm) 20-SOIC (0.295", 7.50mm Width) 8-SOIC (0.154", 3.90mm Width) 10-SOP (0.154", 3.90mm Width) 20-DIP (0.300", 7.62mm)
Supplier Device Package 20-DIP 20-SO 8-SO 10-SSOP 20-DIP

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