L4986 Datasheet CCM PFC controller with high voltage startup Features Peak current mode CCM-operated 800 V high voltage startup with integrated input voltage sensing Active input filter capacitor discharge Proprietary multiplier emulator with minimum THD of line current in all operating conditions (CCM and DCM) Extremely few external components Protections: feedback loop failure, OVP, OCP, inductor saturation, brown-in, brownout (compliant to medical SMPS standards) Inductor current sense Disable and low consumption function In-rush current monitoring Soft-start for smooth startup 1.2% ( Tj = 25 C) internal reference voltage 65 kHz (A version) and 130 kHz (B version) switching frequency PGOOD OUT and adjustable PGOOD IN SSOP10 package Application PFC pre-regulators for: IEC61000-3-2 and JEIDA-MITI compliant SMPS in excess of 1 kW Product status link Desktop PC, server, web server, game console L4986 High power LED luminaries Industrial and medical SMPS according to IEC 60601-1-2 L4986A L4986B Description L4986ATR The L4986 is a peak current-mode PFC controller for boost converter with a L4986BTR proprietary multiplier emulator which in addition to the innovative THD optimizers guarantee very low Total Harmonic Distortion (THD) performance in all operating Product summary conditions. The device comes in a pin SO package and offers a high performance/ Order low-component count solution for CCM-operated boost PFC pre-regulators in Package Packaging codes EN61000-3-2 and JEIDA-MITI compliant applications, in a power range that spans L4986A Tube from few hundred W to some kW. L4986B Tube The device, thanks to a proprietary off-time modulator, operates in quasi-fixed frequency in all operating conditions. Two options are available, 65 kHz for A and Tape and SSOP10 L4986ATR 130 kHz for B. reel The 800 V high voltage start-up block includes also the circuitry to discharge the Tape and L4986BTR X-capacitors of the EMI filter to a safe level. This allows the unit to meet safety reel regulation (such as IEC 61010-1 or IEC 62368-1) without using the traditional discharge resistor in parallel to the X-capacitors. DS13768 - Rev 2 - August 2021 www.st.com For further information contact your local STMicroelectronics sales office.L4986 The device features low consumption and disable functions allowing usage in Product label applications supposed to comply even with the latest energy saving requirements issued by Energy Star, the Department of Energy (DoE) in the United States, the European Code of Conduct, the European Unions Ecodesign Directive, and other guidelines. In addition to an overvoltage protection able to keep the output voltage under control during transient conditions, the IC is provided also with a protection against feedback loop failures or erroneous settings and boost inductor saturation. The brownout protection function allows to design medical equipment according to the latest regulations driven by IEC 60601-1-2 which requires the output regulation in case of mains dips lasting up to 500 msec. Soft-start limits the peak current. The PG IN is an adjustable input comparator suitable for monitoring the PFC output voltage and accordingly driving a logic signal exiting from PG OUT pin. The totem- pole output stage, capable of 0.7 A source and 1.5 A sink current, is suitable for big MOSFET or IGBT drive. DS13768 - Rev 2 page 2/31