STMicroelectronics L4985/6

The L4985A/B and L4986A/B 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 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.

Devices operate in quasi-fixed frequency in all operating conditions. Two options are available, 65 kHz for A and 130 kHz for B.

Key features

• 800V High Voltage Start-up
• Low THD at any operation conditions
• Inductor current sensing
• Extremely few external component

Additional 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 (for L4986)
• SO8 package (for L4985) and SSOP10 package (for L4986)

Applications

• PFC pre-regulators for:
  • IEC61000-3-2 and JEIDA-MITI compl. 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

Available tools

 

EVL400W-80PL:

12 V - 400 W adapter based on L4985A, L6699 and SRK2001

The EVL400W-80PL demonstration board is a 12 V - 400 W converter, tailored to the typical specifications of an AC/DC adapter with wide input mains range, very low power consumption at light load and good average efficiency.

DATASHEET

 

EVL4985-350W:

Low-THD 350W CCM-PFC pre-regulator based on L4985

The EVL4985-350W evaluation board, based on the new L4985 continuous conduction mode power factor controller, implements a 350 W wide-range input PFC pre-regulator.

DATASHEET

 

EVL4986-350W:

Low-THD 350W CCM-PFC pre-regulator based on L4986

The EVL4986-350W evaluation board, based on the new L4986 continuous conduction mode power factor controller, implements a 350 W wide-range input PFC pre-regulator.

DATASHEET

 

EVL4986A-1KWBL:

Low THD-High Efficiency, 1KW Bridgeless CCM-PFC pre-regulator based on L4986A

The EVL4986A-1KWBL demonstration board is a bridgeless PFC pre-regulator, double boost topology, featuring 1 kW output power (400 Vdc) and wide input voltage range (90 Vac-265 Vac), based on the new L4986A peak current mode CCM power factor controller.

DATASHEET