L4981:L4981A: Fixed Frequency Average Current Mode; L4981B: Line Modulated Frequency Average Current Mode

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.

Key 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
Product Specifications
DescriptionVersionSize
DS0071: Power factor corrector6.22 MB
Application Notes
DescriptionVersionSize
AN828: 1500W - 440V power factor corrector preregulator3.334 KB
AN4026: 19 V - 90 W adapter with PFC for laptop computers using the L6563H and L66991.2988 KB
AN1606: A "bridgeless PFC configuration" based on L4981 PFC controller3.2283 KB
AN827: A 500W high power factor with the L4981A continuous mode IC1.2242 KB
AN2649: A power factor corrector with MDmesh™ II and SiC diode2.0767 KB
AN510: Circuits for power factor correction with regards to mains filtering1.3418 KB
AN628: Designing a high power factor switching preregulator with the L4981 continuous mode9.4778 KB
AN833: FREQUENCY MODULATION ON L4981B1.127 KB
AN832: L4981A synchronization1.228 KB
AN829: Semiconductor kit for power factor corrector3.396 KB
Presentations
DescriptionVersionSize
Power Factor Corrector controllers portfolio1 MB
Brochures
DescriptionVersionSize
Brochure Power management guide05.20164 MB
Sample & Buy
Part NumberPackagePacking TypeUnit Price (US$) *QuantityECCN (EU)ECCN (US)Country of Origin
L4981BDSO-20Tube--NECEAR99MALAYSIA
L4981BD013TRSO-20Tape And Reel--NECEAR99MALAYSIA
L4981ADSO-20Tube--NECEAR99MALAYSIA
L4981AD013TRSO-20Tape And Reel--NECEAR99MALAYSIA
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
L4981BDSO-20IndustrialEcopack2 (**)md_z7-wspc-so-wspc-20-wspc-.30-wspc-to-wspc-jedec-wspc-ms-013_b5z7-wspc-u527cb7.pdf
md_z7-wspc-so-wspc-20-wspc-.xml
L4981BD013TRSO-20IndustrialEcopack2 (**)md_z7-wspc-so-wspc-20-wspc-.30-wspc-to-wspc-jedec-wspc-ms-013_b5z7-wspc-u527cb7.pdf
md_z7-wspc-so-wspc-20-wspc-.xml
L4981ADSO-20IndustrialEcopack2 (**)md_z7-wspc-so-wspc-20-wspc-.30-wspc-to-wspc-jedec-wspc-ms-013_b5z7u509cb6.pdf
md_z7-wspc-so-wspc-20-wspc-.30-wspc-to-wspc-jedec-wspc-ms-013_b5z7u509cb6.xml
L4981AD013TRSO-20IndustrialEcopack2 (**)md_z7-wspc-so-wspc-20-wspc-.30-wspc-to-wspc-jedec-wspc-ms-013_b5z7u509cb6.pdf
md_z7-wspc-so-wspc-20-wspc-.30-wspc-to-wspc-jedec-wspc-ms-013_b5z7u509cb6.xml
Power factor corrector L4981
circuit_diagram_1366_thumbnail.png L4981
1500W - 440V power factor corrector preregulator L4981
19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699 L6699
A "bridgeless PFC configuration" based on L4981 PFC controller L4981
A 500W high power factor with the L4981A continuous mode IC L4981
A power factor corrector with MDmesh™ II and SiC diode L4981
Circuits for power factor correction with regards to mains filtering L4981
Designing a high power factor switching preregulator with the L4981 continuous mode L4981
FREQUENCY MODULATION ON L4981B L4981
L4981A synchronization L4981
Semiconductor kit for power factor corrector L4981
EVL4984-350W: 350 W CCM PFC pre-regulator with the L4984D L4984D
Very low drop voltage regulators with inhibit KFXX
md_z7-wspc-so-wspc-20-wspc-.30-wspc-to-wspc-jedec-wspc-ms-013_b5z7-wspc-u527cb7.pdf L4981
md_z7-wspc-so-wspc-20-wspc-.xml L6585DE
md_z7-wspc-so-wspc-20-wspc-.30-wspc-to-wspc-jedec-wspc-ms-013_b5z7u509cb6.pdf L4981
md_z7-wspc-so-wspc-20-wspc-.30-wspc-to-wspc-jedec-wspc-ms-013_b5z7u509cb6.xml L4981