STMicroelectronics L4984D
The L4984D is a current-mode PFC controller operating with line-modulated fixed-off-time (LM-FOT) control. 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.| Part No. | L4984D |
|---|---|
| Datasheet | L4984D Download |
| Manufacturer |  STMicroelectronics |
| Description | CCM PFC controller |
| Buy | Stock & Price |
FEATURES
● Line-modulated fixed-off-time (LM-FOT) control of CCM-operated PFC pre-regulators● Proprietary LM-FOT modulator for nearly fixedfrequency 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
APPLICATIONS
● PFC pre-regulators for: – IEC61000-3-2 and JEIDA-MITI compliant SMPS in excess of 1 KW – Desktop PC, server, web server April 2013 This is information on a product in full production. DocID024474 Rev 1 1/35 35DESCRIPTION
1DESCRIPTION
L4984D A proprietary LM-FOT modulator allows fixed-frequency operation for boost PFC converters as long as they are operated in CCM (continuous conduction mode).
