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L4985

STMicroelectronics
Part Number L4985
Manufacturer STMicroelectronics
Description CCM PFC controller
Published Mar 6, 2023
Detailed Description L4985 Datasheet CCM PFC controller with high voltage startup Features • Peak current mode CCM-operated • 800 V high vol...
Datasheet PDF File L4985 PDF File

L4985
L4985

Overview
L4985 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 • SO8 package Product status link L4985 L4985A L4985B L4985ATR L4985BTR Product summary Order codes Package Packaging L4985A Tube L4985B Tube L4985ATR SO-8 Tape and reel L4985BTR Tape and reel 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...


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