L4984D STMicroelectronics

L4984D CCM PFC controller Datasheet - production data Table 1. Device summary Order code Package Packaging L4984D Tube SSOP10 L4984DTR Tape and reel SSOP10 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 2 (1/V 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 DocID024474 Rev 1 1/35 This is information on a product in full production. www.st.com 35Contents L4984D Contents 1 Description . 4 2 Block diagram 5 3 Electrical characteristics . 9 4 Typical electrical performance 12 5 Application information . 16 5.1 Theory of operation . 16 6 Overvoltage protection (OVP) 21 7 Feedback failure detection (FFD) 22 8 Voltage feedforward 23 9 Soft-start 26 10 Inductor saturation detection . 27 11 THD optimizer circuit . 28 12 Power management and housekeeping functions 30 13 Package mechanical data 32 14 Revision history . 34 2/35 DocID024474 Rev 1