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Utsource certified used parts provide the following guarantees:
1. Utsource will inspect the goods, including appearance inspection (no serious damage to the appearance), select qualified and honest suppliers, and ensure 98% qualification rate.
2. Some parts are tested by machine.
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Description
POWER FACTOR CORRECTOR
All product names, trademarks, brands and logos used on this site are the property of their respective owners. The depiction, description or sale of products featuring these names, trademarks, brands and logos is for identification purposes only and is not intended to indicate any affiliation with or authorization by any rights holder.
The parameters and performance indicators of this product are sourced from the internet. In case of discrepancies, please refer to the manufacturer's technical specifications!！
● CONTROL BOOST PWM UP TO 0.99P.F
● LIMITLINE CURRENT DISTORTION TO <5%
● UNIVERSALINPUT MAINS
● FEED FORWARD LINE AND LOAD REGULATION
● AVERAGE CURRENT MODE PWM FOR MINIMUM NOISE SENSITIVITY
● HIGH CURRENT BIPOLAR AND DMOS TOTEM POLE OUTPUT
● LOW START-UP CURRENT (0.3mA TYP.)
● UNDER VOLTAGE LOCKOUT WITH HYSTERESIS AND PROGRAMMABLE TURN ON THRESHOLD
● OVERVOLTAGE, OVERCURRENT PROTECTION
● PRECISE 2% ON CHIP REFERENCE EXTERNALLY AVAILABLE
● SOFT START
DESCRIPTION
The L4981 1.C. provides the necessary features to achieve a very high power factor up to 0.99.
Realized in BCD 60ll technology this power factor corrector(PFC) pre-regulator contains all the control functions for designing a high efficiency-mode power supply with sinusoidal line current consumption.
The L4981 can be easily used in systems with mains voltages between 85V to 265V without any line switch. This new PFC offers the possibility to work at fixed frequency(L4981A)or modulated frequency(L4981B)optimizing the size of the input filter; both the operating frequency modes working with an average current mode PWM controller, maintaining sinusoidal line current without slope compensation.
Besides power MOSFET gate driver, precise voltage reference(externally available), error amplifier, under voltage lockout, current sense and the soft start are included. To limit the number of the external components,the device integrates protections as over voltage and over current. The over current level can be programmed using a simple resistor for L4981A.For a better precision and for L4981B an external divider must be used.
Preview of the first 3 pages of the data sheet
| QUANTITY | UNIT PRICE | PLUS UNIT PRICE | TOTAL PRICE |
|---|---|---|---|
| ≥1: | US $2.45520 | US $2.20968 | US $2.20968 |
| ≥5: | US $1.63680 | US $1.47312 | US $7.36560 |
| ≥10: | US $1.47312 | US $1.32581 | US $13.25810 |
| ≥20: | US $1.43220 | US $1.28898 | US $25.77960 |
| ≥50: | US $1.39128 | US $1.25215 | US $62.60750 |
| ≥100: | US $1.35036 | US $1.21533 | US $121.53300 |
| ≥200: | US $1.30944 | US $1.17850 | US $235.70000 |
| ≥500: | US $1.29307 | US $1.16376 | US $581.88000 |
| ≥1000: | US $1.26852 | US $1.14167 | US $1141.67000 |
Substitute (equivalent) Product
| Substitute Product | Description |
|---|---|
| UC3845 | High-performance current mode PWM controller commonly used in switch-mode power supplies. |
| MC34063 | A versatile DC-DC converter IC used for step-up, step-down, and inverting applications. |
| TL494 | PWM control IC designed for Switch Mode Power Supply (SMPS) applications. |
| SG3525A | PWM controller IC that provides complete pulse-width modulation control for power device drivers. |
| L6562 | Power factor correction (PFC) controller designed for input stage AC-DC conversion in switch-mode power supplies. |
| NCP1653 | A PFC controller intended for continuous conduction mode (CCM) and discontinuous conduction mode (DCM) boost circuits. |
| UC3854BN | Active PFC controller for high efficiency and lower harmonic distortion in power supply designs. |
| LM5022 | Low-side controller for boost, flyback, SEPIC, and forward converters used in power management applications. |
| FA5501 | General-purpose current mode PWM controller for various power supply configurations. |
| SG6841T | PWM controller for high-performance offline power supplies, supports multiple control modes. |
Product Usage
The L4981B is a high-performance power factor correction (PFC) controller integrated circuit, primarily used to improve the power factor in AC-DC converter circuits. It is commonly found in circuits that require efficient power factor correction to meet regulatory standards and enhance overall power efficiency. Specific application areas for circuits utilizing the L4981B include:
Switched-mode power supplies (SMPS):
Lighting equipment:
AC-DC converters and adapters:
Uninterruptible Power Supplies (UPS):
Industrial and consumer electronics:
Key features of the L4981B that make it suitable for these applications include:
By incorporating the L4981B into these circuits, designers can meet stringent power efficiency and harmonic distortion requirements, ensuring reliable and compliant performance for various electronic devices and systems.
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| Flag | Country | Estimated Delivery Time | Minimum First Weight Cost | ||
|---|---|---|---|---|---|
| Express | Standard Shipping | Express (0.5kg) | Standard Shipping (0.05kg) | ||
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Warranty
All UTSOURCE purchases have a 90 days money back return policy, plus a 100 days UTSOURCE warranty against any manufacturing defects.This warranty shall not apply to any item where defects have been caused by improper customer assembly, failure by customer to follow instructions, product modification, negligent or improper operation.
L4981B
L4981B has several brands around the world that may have alternate names for L4981B due to regional differences or acquisition. L4981B may also be known as the following names:
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