L4981AD AC-DC Converters by STMicroelectronics

L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode

Status: Active
Series: L4981
RoHS: Compliant
View Datasheet Manufacturer Site View Pricing & Stock

The L4981 I.C. provides the necessary features to achieve a very high power factor up to 0.99. Realized in BCD 60II 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 anyline 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 overvoltage and overcurrent. The overcurrent level can be programmed using simple resistor for L4981A. For a better precision and for L4981B an external divider must be used.

Prices starting from US$1.96


Distributor Starting From Stock
Logo for Future Electronics Future Electronics US$1.96
1,000
Buy Now
Logo for Chip One Stop Chip One Stop US$2.03
998
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Logo for Transfer Multisort Elektronik Transfer Multisort Elektronik US$2.75
179
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Logo for EBV Elektronik EBV Elektronik -
800
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Logo for Avnet Silica Avnet Silica -
120
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Logo for Avnet America Avnet America US$2.11
-
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Logo for Distrelec Distrelec US$3.99
-
Buy Now
Logo for Newark Electronics Newark Electronics -
-
Buy Now
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Features

PRECISE 2% ON CHIP REFERENCE EXTERNALLY AVAILABLE
OVERVOLTAGE, OVERCURRENT PROTECTION
SOFT START
LOW START-UP CURRENT (0.3mA TYP.)
HIGH CURRENT BIPOLAR AND DMOS TOTEM POLE OUTPUT
CONTROL BOOST PWM UP TO 0.99P.F.
UNIVERSAL INPUT MAINS
LIMIT LINE CURRENT DISTORTION TO < 5%
AVERAGE CURRENT MODE PWM FOR MINIMUM NOISE SENSITIVITY
UNDER VOLTAGE LOCKOUT WITH HYSTERESIS AND PROGRAMMABLE TURN ON THRESHOLD
FEED FORWARD LINE AND LOAD REGULATION

Alternative Descriptions

L4981 Series 19.5 V 16 mA Surface Mount Power Factor Corrector - SOIC-20 | Future Electronics
Power Factor Correction PWM 0.3mA 115KHz | RS
IC: driver | Transfer Multisort Elektronik
Power Factor Correction PWM CONTRLR 0.3mA 115KHz 20-Pin SO Tube | EBV Elektronik
ST PFC IC, SO-20, Tube, 600mW, 300uA | Distrelec
Power Factor Corrector, 19.5V, Soic-20 | Newark Electronics


Frequently Asked Questions

Where can I find additional details, specifications and documents for a L4981AD?

Additional datasheets, footprints and schematics for L4981AD are listed on our Part Details page. You can also find images and similar parts to L4981AD on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for L4981AD on our Product Comparison page. Access via the 'View Pricing & Stock' button to view L4981AD price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does L4981AD fall under?

The L4981AD is listed under Power Management > AC-DC Converters > PFC Controllers.

Can I view similar or alternative parts?

You can view similar parts to L4981AD when available in the PFC Controllers range under the specifications section at the bottom of the details page.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the L4981AD you can contact the distributor directly for product support, shipping queries etc.

Is the L4981AD RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by STMicroelectronics.

Which authorised distributors for L4981AD have stock available?

Authorised distributors including Future Electronics, Chip One Stop, RS, Transfer Multisort Elektronik and EBV Elektronik have stock available or on a lead time for L4981AD.

How do I check stock and lead times for all distributors?

Stock availability and lead times will be displayed for L4981AD often in real-time on the comparison pages.

What if I can't find stock of L4981AD?

You can fill out our help required form which you can use to request a quote for L4981AD from some of our verified obsolescence suppliers. Alternatively, contact us via our web chat in the bottom left of your screen and one of our team will try to help.

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