L4981B Datasheet PDF | STMicroelectronics

STMicroelectronics L4981B

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- November 2001 1/16 L4981A - L4981B put filter; both the operating frequency modes working with an average current mode PWM controller, maintaining sinusoidal line current without slope compensation. The overcurrent level can be programmed using a simple resistor for L4981A.

Part No.	L4981B
Datasheet	L4981B Download
Manufacturer	STMicroelectronics
Description	POWER FACTOR CORRECTOR
Buy	Stock & Price

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- BLOCK DIAGRAM MULTIPOWER BCD TECHNOLOGY DIP20 SO20 ORDERING NUMBERS: L4981X (DIP20) L4981XD (SO20) trol functions for designing a high efficiency-mode power supply with sinusoidal line current consumption. Besides power MOSFET gate driver, precise voltage reference (externally available), error amplifier, undervoltage lockout, current sense and the soft start are included. To limit the number of the external components, the device integrates protections as overvoltage and overcurrent. For a better precision and for L4981B an external divider must be used.

ABSOLUTE MAXIMUM RATINGS

Symbol VCC IGDRV VGDRV VVA-OUT IAC VCA-OUT VROSC ICOSC IFREQ-MOD VSYNC VIPK Ptot Top Tstg Pin Parameter 19 Supply Voltage (ICC ≤50mA) (*) 20 Gate driv. output peak current (t = 1µs) SINK . SOURCE Gate dri...