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L4985 Datasheet(PDF) 1 Page - STMicroelectronics |
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L4985 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 27 page  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 • SO8 package Application • PFC pre-regulators for: – IEC61000-3-2 and JEIDA-MITI compliant SMPS in excess of 1 kW – Desktop PC, server, web server, game console – High power LED luminaries – Industrial and medical SMPS according to IEC 60601-1-2 Description The L4985 is a peak current-mode PFC controller for boost converter with a proprietary multiplier “emulator” which in addition to the innovative THD optimizers guarantee very low Total Harmonic Distortion (THD) performance in all operating conditions. The device comes in a pin SO package and offers a high performance/ low-component count 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 some kW. 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 130 kHz for B. The 800V high voltage start-up block includes also the circuitry to discharge the X-capacitors of the EMI filter to a safe level. This allows the unit to meet safety regulation (such as IEC 61010-1 or IEC 62368-1) without using the traditional discharge resistor in parallel to the X-capacitors. The device features low consumption and disable functions allowing usage in 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 Union’s Ecodesign Directive, and other guidelines. Product status link L4985 L4985A L4985B L4985ATR L4985BTR Product summary Order codes Package Packaging L4985A SO-8 Tube L4985B Tube L4985ATR Tape and reel L4985BTR Tape and reel CCM PFC controller with high voltage startup L4985 Datasheet DS13769 - Rev 3 - January 2022 For further information contact your local STMicroelectronics sales office. www.st.com |
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