L4984D:CCM PFC CONTROLLER

The L4984D is a current-mode PFC controller operating with line-modulated fixed-off-time (LM-FOT) control. A proprietary LM-FOT modulator allows fixed-frequency operation for boost PFC converters as long as they are operated in CCM (continuous conduction mode).

The chip comes in a 10-pin SO package and offers a low-cost solution for CCM-operated boost PFC pre-regulators in EN61000-3-2 and JEIDA-MITI compliant applications, in a power range that spans from few hundred W to 1 KW and above.

The highly linear multiplier includes a special circuit, able to reduce the crossover distortion of the AC input current, that allows wide-range-mains operation with a reasonably low THD, even over a large load range.

The output voltage is controlled by means of a voltage-mode error amplifier and an accurate (1% at Tj = 25 °C) internal voltage reference. Loop stability is optimized by the voltage feedforward function (1/V2correction), which in this IC uses a proprietary technique that also significantly improves line transient response in the case of mains drops and surges (“bi-directional”).

The device features low consumption and includes a disable function suitable for IC remote on/off. These features allow use in applications which also comply with the latest energy saving requirements (Blue Angel, ENERGY STAR , Energy 2000, etc.).

In addition to overvoltage protection able to keep the output voltage under control during transient conditions, the IC is also provided with protection against feedback loop failures or erroneous settings. Other onboard protection functions allow that brownout conditions and boost inductor saturation can be safely handled. Soft-start limits peak current and extends off-time to prevent flux runaway in the initial cycles.

The totem pole output stage, capable of 600 mA source and 800 mA sink current, is suitable for big MOSFETs or IGBT drive.

Key Features

  • Line-modulated fixed-off-time (LM-FOT) control of CCM-operated PFC pre-regulators
  • Proprietary LM-FOT modulator for nearly fixed-frequency operation
  • Proprietary multiplier design for minimum THD of AC input current
  • Fast “bi-directional” input voltage feedforward (1/V2 correction)
  • Accurate adjustable output overvoltage protection
  • Protection against feedback loop failure (latched shutdown)
  • Inductor saturation protection
  • AC brownout detection
  • Digital leading-edge blanking on current sense
  • Soft-start
  • 1% (at Tj = 25 °C) internal reference voltage
  • - 600 / + 800 mA totem pole gate driver with active pull-down during UVLO and voltage clamp
  • SSOP10 package
Product Specifications
DescriptionVersionSize
DS9596: CCM PFC controller1.04 MB
Application Notes
DescriptionVersionSize
AN4026: 19 V - 90 W adapter with PFC for laptop computers using the L6563H and L66991.2988 KB
AN4149: Designing a CCM PFC pre-regulator based on the L4984D2.02 MB
AN4163: EVL4984-350W: 350 W CCM PFC pre-regulator with the L4984D2.03 MB
Presentations
DescriptionVersionSize
EuP Lot 6 Tier2 Ecodesign requirements for Standby2 MB
L4984D CCM PFC Controller1.0322 KB
Power Factor Corrector controllers portfolio1 MB
Brochures
DescriptionVersionSize
Brochure Power management guide05.20164 MB
Solution Evaluation Tools
Part NumberManufacturerDescription
EVL400W-ADP/ATX12V - 400W SMPS for Adapter, Desktop and AIO using L4984D, L6699 and SRK2000A
EVL4984-350W350 W CCM PFC pre-regulator demonstration board based on the L4984D
Sample & Buy
Part NumberPackagePacking TypeUnit Price (US$) *QuantityECCN (EU)ECCN (US)Country of Origin
L4984DTRSSOP 10Tape And Reel0.8371000NECEAR99MOROCCO
L4984DSSOP 10Tube0.8371000NECEAR99MOROCCO
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
L4984DTRSSOP 10IndustrialEcopack2md_w4-wspc-ssop-wspc-10l-wspc-3-wspc-.-wspc-9-wspc-body-wspc-1-wspc-pitch_b5w4-wspc-ue41ac6.pdf
md_w4-wspc-ssop-wspc-10l-wspc-3-wspc-.xml
L4984DSSOP 10IndustrialEcopack2md_w4-wspc-ssop-wspc-10l-wspc-3-wspc-.-wspc-9-wspc-body-wspc-1-wspc-pitch_b5w4-wspc-ue41ac6.pdf
md_w4-wspc-ssop-wspc-10l-wspc-3-wspc-.xml
CCM PFC controller L4984D
19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699 L6699
Designing a CCM PFC pre-regulator based on the L4984D L4984D
EVL4984-350W: 350 W CCM PFC pre-regulator with the L4984D EVL4984-350W
12 V – 400 W SMPS for adapter, desktop and AIO using L4984D, L6699 and SRK2000A EVL400W-ADP-ATX
EVL4984-350W: 350 W CCM PFC pre-regulator with the L4984D L4984D
EVL4984-350W: 350 W CCM PFC pre-regulator with the L4984D L4984D
Very low drop voltage regulators with inhibit KFXX
md_w4-wspc-ssop-wspc-10l-wspc-3-wspc-.-wspc-9-wspc-body-wspc-1-wspc-pitch_b5w4-wspc-ue41ac6.pdf L4984D
md_w4-wspc-ssop-wspc-10l-wspc-3-wspc-.xml L4984D