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L4981A Datasheet(PDF) 1 Page - STMicroelectronics |
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L4981A Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 17 page  L4981A L4981B POWER FACTOR CORRECTOR CONTROL BOOST PWM UP TO 0.99P.F. LIMIT LINE CURRENT DISTORTION TO < 5% UNIVERSAL INPUT MAINS FEED FORWARD LINE AND LOAD REGULA- TION AVERAGE CURRENT MODE PWM FOR MINIMUM NOISE SENSITIVITY HIGH CURRENT BIPOLAR AND DMOS TO- TEM POLE OUTPUT LOW START-UP CURRENT (0.3mA TYP.) UNDER VOLTAGE LOCKOUT WITH HYS- TERESIS AND PROGRAMMABLE TURN ON THRESHOLD OVERVOLTAGE, OVERCURRENT PROTEC- TION PRECISE 2% ON CHIP REFERENCE EX- TERNALLY AVAILABLE SOFT START DESCRIPTION The L4981 I.C. provides the necessary features to achieve a very high power factor up to 0.99. Realized in BCD 60II technology this power factor corrector (PFC) pre-regulator contains all the con- trol functions for designing a high efficiency-mode power supply with sinusoidal line current con- sumption. The L4981 can be easily used in systems with mains voltages between 85V to 265V without any line switch. This new PFC offers the possibility to work at fixed frequency (L4981A) or modulated frequency (L4981B) optimizing the size of the in- September 1998 ® BLOCK DIAGRAM ORDERING NUMBERS: L4981X (DIP20) L4981XD (SO20) DIP20 SO20 MULTIPOWER BCD TECHNOLOGY 1/17 |
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