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Description
POWER FACTOR CORRECTOR
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● CONTROL BOOST PWM UP TO 0.99P.F.
● LIMITLINE CURRENT DISTORTION TO < 5%
● UNIVERSAL INPUT 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 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 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, undervoltage 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 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
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10000 buyer reviews from United States
Brian Taylor
Length of registration:7 years
I would like to thank Utsource for providing the L4981AD013TR electronic component. The component has met my expectations for performance and reliability. I look forward to doing business with Utsource in the future.
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03/17/2023
Ricardo Rodriguez
Length of registration:12 years
llego todo bien
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10/19/2017
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All UTSOURCE purchases have a 60 days money back return policy, plus a 90 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.
L4981A
L4981A has several brands around the world that may have alternate names for L4981A due to regional differences or acquisition. L4981A may also be known as the following names:
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Stock Status: 10000
Minimum: 3
Total Price:
Unit Price:1.00584
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Stop production experts, we can provide a large number of electronic components that have been stopped production and are difficult to find, to facilitate the maintenance company
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