L4981BD
Premium quality correction for high-current, high-voltage systems





Brands: Stmicroelectronics
Mfr.Part #: L4981BD
Datasheet: L4981BD Datasheet (PDF)
Package/Case: SO-20
Product Type: PFC (Power Factor Correction)
RoHS Status:
Stock Condition: 13,140 pcs, New Original
Warranty: 1 Year Ovaga Warranty - Find Out More
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L4981BD General Description
The L4981BD is a cutting-edge power factor corrector that enables the development of high-efficiency power supplies with a remarkable power factor of up to 0.99. Designed using advanced BCD 60II technology, this IC offers a comprehensive set of control functions for achieving sinusoidal line current consumption. Operating seamlessly within mains voltages ranging from 85V to 265V, the L4981BD eliminates the need for a line switch, simplifying system design and enhancing reliability. Whether operating in fixed frequency mode (L4981A) or modulated frequency mode (L4981B), this PFC regulator ensures optimal performance and control, maintaining sinusoidal line current without slope compensation. Equipped with essential features such as a power MOSFET gate driver, voltage reference, error amplifier, and integrated protections such as overvoltage and overcurrent protection, the L4981BD offers a streamlined solution for efficient power supply design

Features
- ADVANCED PWM CONTROL
- SELF-REGULATING POWER
- PRECISE TEMPERATURE SENSING
- SIMULTANEOUS MULTIPLE OUTPUTS
Application
- Low-power consumption design
- Efficient power regulation
- LED driver performance
Specifications
Parameter | Value | Parameter | Value |
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ECCN US | EAR99 | ECCN EU | NEC |
Packing Type | Tube | Grade | Industrial |
Base Product Number | L4981 |
Shipping
Shipping Type | Ship Fee | Lead Time | |
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DHL | $20.00-$40.00 (0.50 KG) | 2-5 days |
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Fedex | $20.00-$40.00 (0.50 KG) | 2-5 days |
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UPS | $20.00-$40.00 (0.50 KG) | 2-5 days |
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TNT | $20.00-$40.00 (0.50 KG) | 2-5 days |
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EMS | $20.00-$40.00 (0.50 KG) | 2-5 days |
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REGISTERED AIR MAIL | $20.00-$40.00 (0.50 KG) | 2-5 days |
Processing Time:Shipping fee depend on different zone and country.
Payment
Terms of payment | Hand Fee | |
---|---|---|
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Wire Transfer | charge US$30.00 banking fee. |
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Paypal | charge 4.5% service fee. |
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Credit Card | charge 3.5% service fee. |
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Western Union | charge US.00 banking fee. |
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Money Gram | charge US$0.00 banking fee. |
Guarantees
1.The electronic components you purchase include 365 Days Warranty, We guarantee product quality.
2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.
Packing
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Step1 :Product Inventory
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Step2 :Pressure Relief Packaging
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Step3 :Anti Static Packaging
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Step4 :Protective Packaging
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Step5 :Sealed Packaging
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Step6 :Preparation for shipment
We will inspect and count all goods before shipping to ensure that all products are intact and in accurate quantity, and will fully package them to ensure that they will not be damaged during transportation.
Q: How can I order the L4981BD?
A: To place an order for the L4981BD, select the "Add to Cart" button associated with the product listing on our website. Once selected, you can finalize your purchase by proceeding to the checkout page, where you can enter your payment and shipping information.
Q: What is the warranty period for the L4981BD?
A: We offer a 1-year warranty on the L4981BD. This warranty covers any defects in materials and artistry under normal use. During the warranty period, if the product is found to be defective, it will be repaired or replaced at no charge. For further details, please refer to our warranty policy.
Q: How does Ovaga ensure the authenticity of L4981BD from Stmicroelectronics?
A: Ovaga has a dedicated business development team that rigorously tests and verifies the credentials of original Stmicroelectronics manufacturers and authorized agents. All Stmicroelectronics suppliers must pass a qualification review before they can list their L4981BD products on our platform. We emphasize sourcing from reliable channels and maintaining high product quality standards, ensuring you can make your purchase with confidence.
Q: How can I find detailed information about the L4981BD chips, such as application notes, factory information, and images?
A: You can utilize Ovaga's intelligent search engine, filter by the Ethernet PHY Products category, or visit the Stmicroelectronics information page to find comprehensive details about the L4981BD.
Q: Are the price and stock information for L4981BD on Ovaga's platform accurate?
A: Inventory levels for Stmicroelectronics products can fluctuate and may not be updated in real time. The information is refreshed periodically within 24 hours. To confirm stock availability and final pricing, you must confirm your order with an Ovaga salesperson or customer service representative before proceeding with payment.
Q: Can I place orders offline with Ovaga?
A: Yes, offline orders are accepted. You can navigate to the "My Orders" section and enter transaction management to place your order. Reviewing the "Order Details" and proceeding to place the order is straightforward. Additionally, you may benefit from coupons or selected gifts when ordering online.
Q: What payment methods are accepted by Ovaga?
A: Ovaga accepts various payment methods, including Wire Transfer, PayPal, Credit Cards, Western Union, and Money Gram.
Q: How is shipping arranged, and how can I track my package?
A: Customers can choose from industry-leading freight companies such as DHL, FedEx, UPS, TNT, EMS, and Registered Air Mail. Once your order is processed for shipment, you will receive an email with the shipping status and tracking number. Note that tracking information may take up to 24 hours to be displayed by carriers. Typically, express delivery takes 2-5 days.
Q: What is the return or replacement process for L4981BD?
A: Ovaga conducts Pre-Shipment Inspections (PSI) on all orders to ensure quality before shipment. Suppose there are issues such as quantity discrepancies, incorrect items, or visible defects (e.g., breakage or rust), and they are acknowledged by us. In that case, returns or replacements will be accepted under the following conditions:
- ●The defect must be reported within 365 days after delivery.
- ●The product must be unused and in its original, unopened packaging.
- ●Requesting Return Authorizations must be obtained.
For the return process:
- ●Please inform us within 365 days of receiving the product.
- ●Obtain Return Authorization from our team.
- ●Please refer to our After-Sale Matters for more detailed instructions.
Q: How can I contact Ovaga for support, including obtaining datasheets or pin diagrams for the L4981BD?
A: For any after-sales support or technical inquiries, including requests for datasheets or pin diagrams, please get in touch with us via email at [email protected].
Q: What can you tell me about Ovaga's quality assurance practices?
A: Ovaga is committed to maintaining the highest standards of quality. We are certified under ISO14001, ISO 9001, IATF16949, ISO13485, and DUNS standards by the Quality Systems Registrar. This certification signifies that our operational systems meet stringent international standards in quality management. Our compliance is regularly reviewed and tested to ensure ongoing adherence to these standards, affirming our commitment to quality and continuous improvement.
Q: What do the ISO, IATF, and DUNS certifications mean for customers of Ovaga?
A: Our ISO, IATF, and DUNS certifications assure customers that Ovaga operates systems that are both accurate and comprehensive, meeting the rigorous requirements of the ISO, IATF, and DUNS standards. This certification underscores our long-term commitment to continuous improvement across our operations. As a note to our customers, while we strive for accuracy in product data on our website, we recommend referring to the manufacturer's datasheet or catalog for confirmed product specifications before placing an order. If you identify any discrepancies, please get in touch with us immediately.
Part points
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The L4981BD chip is a power factor correction integrated circuit (IC) that is designed for high-efficiency offline converters. It operates as a controller for boost, flyback, and SEPIC power factor correction (PFC) converters. The chip incorporates a range of features including overvoltage protection, brownout protection, and a synchronizable frequency oscillator. Overall, the L4981BD chip is used to improve power factor and efficiency in AC-DC power supplies.
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Equivalent
Some equivalent products to the L4981BD chip include the L4981A, the ST’s L4981AD, and the NCP1601B. -
Features
The L4981BD is a PWM current-mode controller specifically designed for high-efficiency off-line converters. It features a built-in soft-start, a frequency jittering for EMI reduction, and overvoltage and overcurrent protections. The device operates in the Quasi-resonant mode to increase efficiency and minimize switching losses. -
Pinout
The L4981BD is a PWM current-mode controller IC. It has a pin count of 16 pins. The functions of the pins include power and ground connections, feedback and error amplifier inputs, soft-start and shutdown controls, oscillator timing, and gate drive outputs. -
Manufacturer
The manufacturer of the L4981BD is STMicroelectronics. STMicroelectronics is a multinational semiconductor company that designs, develops, and manufactures a wide range of electronic components and systems. The company specializes in areas such as power management, microcontrollers, sensors, and other integrated circuits for various applications in automotive, industrial, consumer, and communication markets. -
Application Field
The L4981BD is a high voltage primary controller IC used in offline flyback converters. It is primarily used in applications such as LED drivers, battery chargers, industrial power supplies, and auxiliary power supplies. It offers a wide input voltage range and a variety of protection features, making it suitable for various power conversion applications. -
Package
The L4981BD chip comes in a TO-252 package type, also known as DPAK. The form factor is surface mount. The size of the chip is typically 6.5mm x 6.1mm.
Assembly Advice
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